ORCID Profile
0000-0002-7928-8216
Current Organisation
Flinders University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Materials Engineering | Polymers and Plastics | Colloid and Surface Chemistry | Structural Chemistry and Spectroscopy | Functional Materials | Nanotechnology | Organic Semiconductors | Molecular and Organic Electronics | Water treatment processes | Maritime engineering | Environmental Technologies | Physical Chemistry (Incl. Structural) | Nanoscale Characterisation | Structural Biology (incl. Macromolecular Modelling) | Ship and platform structures (incl. maritime hydrodynamics) | Nanomaterials | Biological control | Biological Control | Surfaces and Structural Properties of Condensed Matter | Condensed Matter Imaging | Nanofabrication, Growth and Self Assembly
ANZSRC Socio-Economic Objective (SEO)
Environmentally Sustainable Manufacturing not elsewhere classified | Expanding Knowledge in the Physical Sciences | Solar-Photovoltaic Energy | Expanding Knowledge in the Chemical Sciences | Control of Pests, Diseases and Exotic Species in Marine Environments | Polymeric Materials (e.g. Paints) | Expanding Knowledge in Technology | Rehabilitation of Degraded Coastal and Estuarine Environments | Expanding Knowledge in the Environmental Sciences | Expanding Knowledge in Engineering | Expanding Knowledge in the Agricultural and Veterinary Sciences | Expanding Knowledge in the Biological Sciences |
Related Links
Publications
Anisotropy of Magnetoconductivity in Oriented Poly(acetylene) Doped with Iodine.
Publisher: Elsevier BV
Date: 04-1993
White Light with Phosphorescent Protein Fibrils in OLEDs
Publisher: American Chemical Society (ACS)
Date: 10-05-2010
DOI: 10.1021/NL1012008
Abstract: Red and yellow phosphorescent insulin amyloid fibrils are used as guest-emitting species within a blue-emitting polyfluorene matrix in light-emitting diodes. The integration of the phosphorescent Ir-complex into the amyloid structures strongly improves the triplet exciton confinement and allows the fabrication of white-emitting device with a very low loading of phosphorescent complex. The overall performances of the devices are improved in comparison with the corresponding bare Ir-complexes. This approach opens a way to explore novel device architectures and to understand the exciton/charge transfer dynamics in phosphorescent light emitting diodes.
Infrared photocurrent spectral response from plastic solar cell with low-band-gap polyfluorene and fullerene derivative
Publisher: AIP Publishing
Date: 22-11-2004
DOI: 10.1063/1.1825070
Abstract: Plastic solar cells were fabricated using a low-band-gap alternating copolymer of fluorene and a donor–acceptor–donor moiety (APFO-Green1), blended with [6,6]-phenyl-C61-butyric acid methylester or 3′-(3,5-Bis-trifluoromethylphenyl)-1′-(4-nitrophenyl)pyrazolino[60]fullerene as electron acceptors. The polymer shows optical absorption in two wavelength ranges from 300& λ& nm and 650& λ& nm. Devices based on APFO-Green1 blended with the later fullerene exhibit an outstanding photovoltaic behavior at the infrared range, where the external quantum efficiency is as high as 8.4% at 840nm and 7% at 900nm, while the onset of photogeneration is found at 1μm. A photocurrent density of 1.76mA∕cm2, open-circuit voltage of 0.54V, and power conversion efficiency of 0.3% are achieved under the illumination of AM1.5 (1000W∕m2) from a solar simulator.
Sub-4 nm mapping of donor–acceptor organic semiconductor nanoparticle composition
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3NR00839H
Abstract: The first report of sub-4 nm mapping of donor : acceptor nanoparticle composition in eco-friendly colloidal dispersions for organic electronics.
Molecular orbital energy level modulation through incorporation of selenium and fluorine into conjugated polymers for organic photovoltaic cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA13040A
Solar light decomposition of DFP on the surface of anatase and rutile TiO2 prepared by hydrothermal treatment of microemulsions
Publisher: Elsevier BV
Date: 06-2005
Evaluation of the performance of several object types for electrical treeing experiments.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2013
Sub-glass transition annealing enhances polymer solar cell performance
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TA14165A
Excitation Transfer in Polymer Photodiodes for Enhanced Quantum Efficiency
Publisher: Wiley
Date: 08-2000
DOI: 10.1002/1521-4095(200008)12:15<1110::AID-ADMA1110>3.0.CO;2-T
Optical amplification of the cutoff mode in planar asymmetric polymer waveguides
Publisher: AIP Publishing
Date: 24-11-2003
DOI: 10.1063/1.1627477
Abstract: Modes with low threshold for optical gain were observed at wavelengths close to the cutoff in experiments probing the lified spontaneous emission of light-emitting polymer thin films. The polymer was the semiconductor layer in a multilayer semiconductor–insulator–metal structure that simulates the one-dimensional waveguide characteristics in the channel of a field-effect transistor. The “cutoff” mode propagates at the polymer/gate-insulator interface, has an optical gain threshold of approximately 10 kW/cm2, and is not influenced by absorption of the gate electrode. The wavelength of the lified emission tracks the cutoff wavelength of the asymmetric double-waveguide structure and the cutoff mode is, therefore, tunable in wavelength. Our results suggest that the light-emitting field-effect transistor architecture is a promising route for the construction of an injection laser.
Conformational transitions in a free amino acid functionalized polythiophene
Publisher: Elsevier BV
Date: 04-2003
Computational Modeling of Isoindigo-Based Polymers Used in Organic Solar Cells
Publisher: American Chemical Society (ACS)
Date: 26-08-2013
DOI: 10.1021/JP404123X
Temperature dependence of the electrical conductivity of potassium-doped polyacetylene as a function of pressure and magnetic field
Publisher: American Physical Society (APS)
Date: 15-04-1993
Thermochromism and optical absorption in Langmuir–Blodgett films of alkyl-substituted polythiophenes
Publisher: AIP Publishing
Date: 15-07-1994
DOI: 10.1063/1.357766
Abstract: Thermochromism and optical absorption in mono- and multilayers of Langmuir–Blodgett films of poly(3-alkylthiophenes), poly(3-octyl-2,2′-bithiophene), and poly(3′-octyl-2,2′ ′,2″-terthiophene) were studied. In sparsely alkylated polythiophenes the magnitude of the thermochromic shift was smaller than in poly(3-alkylthiophenes) and roughly proportional to the sidechain concentration. Results of Valence Effective Hamiltonian calculations were compared with the experimental results of thermochromism. A vibronic structure was found in the absorption spectra of Langmuir–Blodgett films at room temperature. The vibronic splitting in poly(3-hexylthiophene) was approximately 0.18 eV as previously has been observed in poly(3-alkylthiophenes) but in poly(3′-octyl-2,2′ ′,2″-terthiophene) it was 0.20–0.25 eV. The vibronic peaks stay approximately at constant energies and vanish at elevated temperatures.
Structural Aspects of Oriented Poly(octylphenylthiophene) Studied in Bulk and Sub-micron Layers by X-ray Diffraction.
Publisher: Elsevier BV
Date: 08-1995
Tuning the Vertical Phase Separation in Polyfluorene:Fullerene Blend Films by Polymer Functionalization
Publisher: American Chemical Society (ACS)
Date: 11-04-2011
DOI: 10.1021/CM1021596
Porous PEI Coating for Copper Ion Storage and Its Controlled Electrochemical Release
Publisher: Wiley
Date: 03-02-2020
Two-photon absorption of polyfluorene aggregates stabilized by insulin amyloid fibrils
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA08302H
Abstract: We report on the photophysical and optical properties of a polyfluorene derivative (PFO) and its binding to the amyloid-forming protein insulin.
New quinoxaline and pyridopyrazine-based polymers for solution-processable photovoltaics
Publisher: Elsevier BV
Date: 10-2012
Photovoltaic cells with a conjugated polyelectrolyte
Publisher: Elsevier BV
Date: 04-2000
Improvements of fill factor in solar cells based on blends of polyfluorene copolymers as electron donors
Publisher: Elsevier BV
Date: 2007
Side-Chain Architectures of 2,7-Carbazole and Quinoxaline-Based Polymers for Efficient Polymer Solar Cells
Publisher: American Chemical Society (ACS)
Date: 07-03-2011
DOI: 10.1021/MA102783D
Temperature Dependence of Conductivity of Potassium Doped Poly(acetylene) Under Pressure and Magnetic Field
Publisher: Elsevier BV
Date: 04-1993
Electrochemical bandgaps of substituted polythiophenes
Publisher: Royal Society of Chemistry (RSC)
Date: 2003
DOI: 10.1039/B301403G
Energy transfer in a conjugated polymer with reduced inter-chain coupling
Publisher: Elsevier BV
Date: 02-1998
Synthesis and Characterization of Isoindigo‐Based Polymers with Thermocleavable Side Chains
Publisher: Wiley
Date: 05-02-2018
Conjugated polymers with polar side chains in bulk heterojunction solar cell devices
Publisher: Wiley
Date: 13-09-2013
DOI: 10.1002/PI.4600
Phase separation of conjugated polymers — tools for new functions in polymer leds
Publisher: Elsevier BV
Date: 03-1997
Highly Stable Indacenodithieno[3,2-b]thiophene-Based Donor–Acceptor Copolymers for Hybrid Electrochromic and Energy Storage Applications
Publisher: American Chemical Society (ACS)
Date: 11-12-2020
Light-emitting electrochemical cells with crown ether as solid electrolyte.
Publisher: The Electrochemical Society
Date: 12-1997
DOI: 10.1149/1.1838145
Enhanced thermal stability of a polymer solar cell blend induced by electron beam irradiation in the transmission electron microscope
Publisher: Elsevier BV
Date: 05-2017
DOI: 10.1016/J.ULTRAMIC.2017.03.013
Abstract: We show by in situ microscopy that the effects of electron beam irradiation during transmission electron microscopy can be used to lock microstructural features and enhance the structural thermal stability of a nanostructured polymer:fullerene blend. Polymer:fullerene bulk-heterojunction thin films show great promise for use as active layers in organic solar cells but their low thermal stability is a hindrance. Lack of thermal stability complicates manufacturing and influences the lifetime of devices. To investigate how electron irradiation affects the thermal stability of polymer:fullerene films, a model bulk-heterojunction film based on a thiophene-quinoxaline copolymer and a fullerene derivative was heat-treated in-situ in a transmission electron microscope. In areas of the film that exposed to the electron beam the nanostructure of the film remained stable, while the nanostructure in areas not exposed to the electron beam underwent large phase separation and nucleation of fullerene crystals. UV-vis spectroscopy shows that the polymer:fullerene films are stable for electron doses up to 2000kGy.
Enhance performance of organic solar cells based on an isoindigo-based copolymer by balancing absorption and miscibility of electron acceptor
Publisher: AIP Publishing
Date: 03-10-2011
DOI: 10.1063/1.3645622
Abstract: Superior absorption of PC71BM in visible region to that of PC61BM makes PC71BM a predominant acceptor for most high efficient polymer solar cells (PSCs). However, we will demonstrate that power conversion efficiencies (PCEs) of PSCs based on poly[N,N′-bis(2-hexyldecyl)isoindigo-6,6′-diyl-alt-thiophene-2,5-diyl] (PTI-1) with PC61BM as acceptor are 50% higher than their PC71BM counterparts under illumination of AM1.5G. AFM images reveal different topographies of the blends between PTI-1:PC61BM and PTI-1:PC71BM, which suggests that acceptor’s miscibility plays a more important role than absorption. The photocurrent of 9.1 mA/cm2 is among the highest value in PSCs with a driving force for exciton dissociation less than 0.2 eV.
Optimization of the power conversion efficiency in high bandgap pyridopyridinedithiophene-based conjugated polymers for organic photovoltaics by the random terpolymer approach
Publisher: Elsevier BV
Date: 06-2017
The effect of conjugation length on triplet energies, electron delocalization and electron–electron correlation in soluble polythiophenes
Publisher: AIP Publishing
Date: 15-11-2001
DOI: 10.1063/1.1412868
Abstract: Triplet energies from a family of polythiophenes in which effective conjugation length is controlled by steric torsion have been measured for the isolated polymer chain regime, i.e., benzene solution. Triplet states are stabilized by some 0.6 eV as effective conjugation length increases up to ca. 6 repeat units, then saturation occurs. This triplet stabilization must occur by electron delocalization and implies that singlet states are stabilized as conjugation length increases by a combination of electron and exciton delocalization.
Induced photodegradation of quinoxaline based copolymers for photovoltaic applications
Publisher: Elsevier BV
Date: 2016
A polymer photodiode using vapour-phase polymerized PEDOT as an anode
Publisher: Elsevier BV
Date: 2006
Facile Monitoring of Fullerene Crystallization in Polymer Solar Cell Blends by UV–vis Spectroscopy
Publisher: Wiley
Date: 05-02-2014
Synthesis and characterization of benzodithiophene–isoindigo polymers for solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1JM14940G
Platinum Terpyridine Metallopolymer Electrode as Cost-Effective Replacement for Bulk Platinum Catalysts in Oxygen Reduction Reaction and Hydrogen Evolution Reaction
Publisher: American Chemical Society (ACS)
Date: 04-10-2017
Temperature-Modulated Doping at Polymer Semiconductor Interfaces
Publisher: American Chemical Society (ACS)
Date: 12-03-2021
Transparent polymer cathode for organic photovoltaic devices
Publisher: Elsevier BV
Date: 08-2006
Electrochemical control of amplified spontaneous emission in conjugated polymers
Publisher: Elsevier BV
Date: 06-2012
Probing the Relationship between Molecular Structures, Thermal Transitions, and Morphology in Polymer Semiconductors Using a Woven Glass-Mesh-Based DMTA Technique
Publisher: American Chemical Society (ACS)
Date: 23-05-2019
Mapping fullerene crystallization in a photovoltaic blend: an electron tomography study
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR00443H
Abstract: Transmission electron tomography is used to study the vertical distribution of fullerene crystals in a polymer solar cell blend.
Synthesis of regioregular phenyl substituted polythiophenes with FeCl3
Publisher: Elsevier BV
Date: 05-1999
Polymer light-emitting electrochemical cells with frozen p-i-n junction at room temperatur
Publisher: Wiley
Date: 03-1998
DOI: 10.1002/(SICI)1521-4095(199803)10:5<385::AID-ADMA385>3.0.CO;2-M
Luminescence from inter-chain aggregates in polythiophene films
Publisher: Elsevier BV
Date: 03-2001
Synthesis and characterisation of polyfluorenes with light-emitting segments
Publisher: Elsevier BV
Date: 03-2001
Impact of environmentally friendly processing solvents on the properties of blade‐coated polymer solar cells
Publisher: Wiley
Date: 23-11-2018
DOI: 10.1002/POLA.29286
Elastic strain-hardening and shear-thickening exhibited by thermoreversible physical hydrogels based on poly(alkylene oxide)-grafted hyaluronic acid or carboxymethylcellulose
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CP02124E
Abstract: An alternative interpretation of the transient network theory is necessary to explain the evolution of the viscoelastic parameters during the temperature-dependent formation into a solid gel structure.
Neat C60:C70 buckminsterfullerene mixtures enhance polymer solar cell performance
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA02515F
Abstract: Ternary blends of C 60 , C 70 and a thiophene–quinoxaline copolymer (TQ1) can be readily processed from solution. A solar cell efficiency of 3.6% is achieved with a 2 : 1 : 1 TQ1:C 60 :C 70 mixture, accompanied by a high internal quantum efficiency of 75%.
Relating open-circuit voltage losses to the active layer morphology and contact selectivity in organic solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA01195H
Abstract: By manipulating the active-layer morphologies in OSCs, we achieve different open-circuit-voltages without affecting the energy of charge-transfer state.
Carbon Monoxide Adsorption on Silver Doped Gold Clusters
Publisher: American Chemical Society (ACS)
Date: 24-02-2011
DOI: 10.1021/JP111257S
Abstract: Well controlled gas phase experiments of the size and dopant dependent reactivity of gold clusters can shed light on the surprising discovery that nanometer sized gold particles are catalytically active. Most studies that investigate the reactivity of gold clusters in the gas phase focused on charged, small sized clusters. Here, reactivity measurements in a low-pressure reaction cell were performed to investigate carbon monoxide adsorption on neutral bare and silver doped gold clusters (Au(n)Ag(m) n = 10-45 m = 0, 1, 2) at 140 K. The size dependence of the reaction probabilities reflects the role of the electronic shells for the carbon monoxide adsorption, with closed electronic shell systems being the most reactive. In addition, the cluster's reaction probability is reduced upon substitution of gold atoms for silver. Inclusion of a single silver atom causes significant changes in the reactivity only for a few cluster sizes, whereas there is a more general reduction in the reactivity with two silver atoms in the cluster. The experimental observations are qualitatively explained on the basis of a Blyholder model, which includes dopant induced features such as electron transfer from silver to gold, reduced s-d hybrization, and changes in the cluster geometry.
Photophysics of substituted polythiophenes
Publisher: American Chemical Society (ACS)
Date: 31-08-1999
DOI: 10.1021/JP983684U
In-cylinder soot imaging and emissions of stratified combustion in a spark-ignited spray-guided direct-injection gasoline engine
Publisher: SAGE Publications
Date: 16-09-2011
Abstract: The combustion in a spark-ignited spray-guided gasoline direct-injection engine operating in a stratified mode has been studied by in-cylinder imaging of the fuel, OH*, and soot distributions. Information on the fuel distribution was obtained by laser-induced fluorescence imaging of the aromatic molecules in the gasoline. The OH* and soot distributions were simultaneously visualized by detection of the natural emissions at 306 nm (OH*) and around 530 nm (soot) using two intensified charge-coupled device cameras. In addition to the in-cylinder observations, engine-out soot emissions, NO x , and HC were measured. The engine was operated at a speed of 2000 r/min and an indicated mean effective pressure of 2.5 bar, with a fully open throttle, resulting in a globally lean combustion with a fuel–air equivalence ratio of about 0.25. The gasoline was injected in single or double injections by an outward-opening piezo-actuated injector. The combustion was ignited efficiently at locally fuel-rich conditions. The soot formation and oxidation were investigated for the two injection strategies, each with three injection timings and two fixed ignition timings. The results showed that soot was efficiently formed and oxidized. From the in-cylinder measurements, it could be seen that the soot luminescence intensity quickly rose and then declined, while the combustion temperature was still increasing. Furthermore, the OH* intensity was still increasing as the soot luminescence was declining. The soot incandescence peak intensity occurred at a crank angle degree close to 50 per cent mass burned, and the OH* intensity peak arose later, shortly before the maximum soot temperature around top dead centre (TDC). When the injection timing was retarded, with constant ignition timing with respect to injection, it was found that the total soot luminosity increased. In addition, less OH* chemiluminescence was observed during the decrease of the soot incandescence, implying conditions less favourable for efficient soot oxidation in the later part of the combustion for retarded injections. This was confirmed by the engine-out soot emission measurements, which showed increased soot levels as the injection was retarded. It was also found that fuel impinged on the spark plug during the injections, resulting in a persistent jet flame close to the spark plug in the centre of the cylinder, which is believed to contribute to engine-out soot emissions.
The effect of the polymerisation temperature on molecular weight and photoluminescence quantum yield for a phenylsubstituted PPV
Publisher: Elsevier BV
Date: 03-2001
Synthesis and Characterization of Soluble and n-Dopable Poly(quinoxaline vinylene)s and Poly(pyridopyrazine vinylene)s with Relatively Small Band Gap
Publisher: American Chemical Society (ACS)
Date: 23-01-2002
DOI: 10.1021/MA0111111
Luminescent line art by direct-write patterning
Publisher: Springer Science and Business Media LLC
Date: 25-03-2016
DOI: 10.1038/LSA.2016.50
High-Performance Organic Photodetectors from a High-Bandgap Indacenodithiophene-Based π-Conjugated Donor-Acceptor Polymer.
Publisher: American Chemical Society (ACS)
Date: 28-03-2018
Abstract: A conjugated donor-acceptor polymer, poly[4,4,9,9-tetrakis(4-hexylphenyl)-4,9-dihydro- s-indaceno[1,2- b:5,6- b']dithiophene-2,7-diyl- alt-5-(2-ethylhexyl)-4 H-thieno[3,4- c]pyrrole-4,6(5 H)-dione-1,3-diyl] (PIDT-TPD), is blended with the fullerene derivative [6,6]phenyl-C61-butyric acid methyl ester (PC
Photophysics of thiophene based polymers in solution: The role of nonradiative decay processes
Publisher: AIP Publishing
Date: 06-01-2003
DOI: 10.1063/1.1528604
Abstract: An investigation has been undertaken of the photophysics of six thiophene-based polymers. This includes the measurement of fluorescence quantum yields, quantum yields for triplet formation, and determination of fluorescence and triplet lifetimes in benzene solution at room temperature. From the above-mentioned data, the overall set of rates for the deactivation processes (fluorescence, intersystem crossing, and internal conversion), has been evaluated. Mechanisms of nonradiative decay are discussed, and it is shown that both intersystem crossing and internal conversion are important in the decay of the lowest singlet excited state of isolated polythiophenes molecules in solution. Comparison of spectroscopic and photophysical properties of the polymers with analogous oligothiophenes shows that with the polymer, the S1⇝S0 internal conversion deactivation pathway plays a major role, in contrast to the behavior found with the oligomers where this internal conversion deactivation channel is essentially negligible.
In situ FTIR spectroelectrochemical characterization of n- and p-dopable phenyl-substituted polythiophenes
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B905499P
Abstract: In situ attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroelectrochemistry during oxidation (p-doping) and reduction (n-doping) of three phenyl-substituted polythiophenes, namely POPT, PEOPT and POMeOPT is presented. All the three phenyl substituted polythiophenes show both n- and p-doping. The infrared active vibration (IRAV) patterns obtained during electrochemical oxidation (p-doping) and reduction (n-doping) are compared. HOMO and LUMO energy levels are estimated from cyclic voltammetric experiments and from IRAV patterns during oxidation and reduction. A comparison shows that the standard graphical procedure to determine the onset of oxidation and reduction peaks in the cyclic voltammogram can be improved using in situ spectroscopy.
Surfactant Effects on Hydrogen Evolution by Small-Molecule Nonfullerene Acceptor Nanoparticles
Publisher: American Chemical Society (ACS)
Date: 23-08-2022
Utilizing Energy Transfer in Binary and Ternary Bulk Heterojunction Organic Solar Cells
Publisher: American Chemical Society (ACS)
Date: 04-08-2016
Abstract: Energy transfer has been identified as an important process in ternary organic solar cells. Here, we develop kinetic Monte Carlo (KMC) models to assess the impact of energy transfer in ternary and binary bulk heterojunction systems. We used fluorescence and absorption spectroscopy to determine the energy disorder and Förster radii for poly(3-hexylthiophene-2,5-diyl), [6,6]-phenyl-C61-butyric acid methyl ester, 4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl]squaraine (DIBSq), and poly(2,5-thiophene-alt-4,9-bis(2-hexyldecyl)-4,9-dihydrodithieno[3,2-c:3',2'-h][1,5]naphthyridine-5,10-dione). Heterogeneous energy transfer is found to be crucial in the exciton dissociation process of both binary and ternary organic semiconductor systems. Circumstances favoring energy transfer across interfaces allow relaxation of the electronic energy level requirements, meaning that a cascade structure is not required for efficient ternary organic solar cells. We explain how energy transfer can be exploited to eliminate additional energy losses in ternary bulk heterojunction solar cells, thus increasing their open-circuit voltage without loss in short-circuit current. In particular, we show that it is important that the DIBSq is located at the electron donor-acceptor interface otherwise charge carriers will be trapped in the DIBSq domain or excitons in the DIBSq domains will not be able to dissociate efficiently at an interface. KMC modeling shows that only small amounts of DIBSq (<5% by weight) are needed to achieve substantial performance improvements due to long-range energy transfer.
A LIF-study of OH in the negative valve overlap of a spark-assisted HCCI combustion engine
Publisher: SAE International
Date: 14-04-2008
DOI: 10.4271/2008-01-0037
Synthesis of Soluble Phenyl-Substituted Poly(p-phenylenevinylenes) with a Low Content of Structural Defects
Publisher: American Chemical Society (ACS)
Date: 25-05-2002
DOI: 10.1021/MA011768M
Structure-property relationships of small bandgap conjugated polymers for solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B913769F
Abstract: Conjugated polymers as electron donors in solar cells based on donor/acceptor combinations are of great interest, partly due to the possibility of converting solar light with a low materials budget. Six small bandgap polymers with optical bandgap ranging from 1.0-1.9 eV are presented in this paper. All polymers utilize an electron donor-acceptor-donor (DAD) segment in the polymer backbone, creating a partial charge-transfer, to decrease the bandgap. The design, synthesis and the optical characteristics as well as the solar cell characteristics of the polymers are discussed. The positions of the energy levels of the conjugated polymer relative to the electron acceptor are of significant importance and determine not only the driving force for exciton dissociation but also the maximum open-circuit voltage. This work also focuses on investigating the redox behavior of the described conjugated polymers and electron acceptors using square wave voltammetry. Comparing the electrochemical data gives important information of the structure-property relationships of the polymers.
Evaluation of active materials designed for use in printable electrochromic polymer displays
Publisher: Elsevier BV
Date: 12-2006
A convenient synthetic route to poly(p-phenylene-1,2-diphenylvinylenes)
Publisher: Elsevier BV
Date: 06-2000
Substituted polythiophenes designed for optoelectronic devices and conductors
Publisher: Royal Society of Chemistry (RSC)
Date: 1999
DOI: 10.1039/A902859E
A new quinoxaline and isoindigo based polymer as donor material for solar cells: Role of ecofriendly processing solvents on the device efficiency and stability
Publisher: Wiley
Date: 21-09-2016
DOI: 10.1002/POLA.28361
High-Performance Polymer Solar Cells of an Alternating Polyfluorene Copolymer and a Fullerene Derivative
Publisher: Wiley
Date: 17-06-2003
Deposition Methods of Graphene as Electrode Material for Organic Solar Cells
Publisher: Wiley
Date: 07-11-2017
Enhanced Ultraviolet Stability of Air-Processed Polymer Solar Cells by Al Doping of the ZnO Interlayer
Publisher: American Chemical Society (ACS)
Date: 11-01-2016
Abstract: Photostability of organic photovoltaic devices represents a key requirement for the commercialization of this technology. In this field, ZnO is one of the most attractive materials employed as an electron transport layer, and the investigation of its photostability is of particular interest. Indeed, oxygen is known to chemisorb on ZnO and can be released upon UV illumination. Therefore, a deep analysis of the UV/oxygen effects on working devices is relevant for the industrial production where the coating processes take place in air and oxygen/ZnO contact cannot be avoided. Here we investigate the light-soaking stability of inverted organic solar cells in which four different solution-processed ZnO-based nanoparticles were used as electron transport layers: (i) pristine ZnO, (ii) 0.03 at %, (iii) 0.37 at %, and (iv) 0.8 at % aluminum-doped AZO nanoparticles. The degradation of solar cells under prolonged illumination (40 h under 1 sun), in which the ZnO/AZO layers were processed in air or inert atmosphere, is studied. We demonstrate that the presence of oxygen during the ZnO/AZO processing is crucial for the photostability of the resulting solar cell. While devices based on undoped ZnO were particularly affected by degradation, we found that using AZO nanoparticles the losses in performance, due to the presence of oxygen, were partially or totally prevented depending on the Al doping level.
Conjugated polymers based on benzodithiophene and fluorinated quinoxaline for bulk heterojunction solar cells: thiophene versus thieno[3,2-b]thiophene as π-conjugated spacers
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3PY01519J
High-performance all-polymer solar cells based on fluorinated naphthalene diimide acceptor polymers with fine-tuned crystallinity and enhanced dielectric constants
Publisher: Elsevier BV
Date: 03-2018
Application of an Open-Circuit Voltage Decay Model to Compare the Performances of Donor Polymers in Bulk Heterojunction Solar Cells
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2018
Lasing in a Microcavity with an Oriented Liquid-Crystalline Polyfluorene Copolymer as Active Layer
Publisher: Wiley
Date: 03-2001
DOI: 10.1002/1521-4095(200103)13:5<323::AID-ADMA323>3.0.CO;2-X
Environmentally friendly preparation of nanoparticles for organic photovoltaics
Publisher: Elsevier BV
Date: 08-2018
Synthesis and Characterization of Poly(pyridine vinylene) via the Sulfinyl Precursor Route
Publisher: American Chemical Society (ACS)
Date: 14-09-2001
DOI: 10.1021/MA010575W
Expanded Multiband Super-Nyquist CAP Modulation for Highly Bandlimited Organic Visible Light Communications
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2020
Nano-pathways: Bridging the divide between water-processable nanoparticulate and bulk heterojunction organic photovoltaics
Publisher: Elsevier BV
Date: 2016
Random polyfluorene <i>co</i>-polymers designed for a better optical absorption coverage of the visible region of the electromagnetic spectrum
Publisher: African Journals Online (AJOL)
Date: 24-01-2014
Computational modelling of donor-acceptor conjugated polymers through engineered backbone manipulations based on a thiophene-quinoxaline alternating copolymer
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TA14456A
Building intermixed donor-acceptor architectures for water-processable organic photovoltaics
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8CP07137C
Abstract: Building intermixed donor–acceptor nanoparticle morphologies by utilising rapid miniemulsion dispersed phase solvent removal to disrupt self-assembly.
Electrophosphorescence from polythiophene blends light-emitting diodes
Publisher: Elsevier BV
Date: 04-2003
Quantitative Grafting for Structure-Function Establishment: Thermoresponsive Poly(alkylene oxide) Graft Copolymers Based on Hyaluronic Acid and Carboxymethylcellulose.
Publisher: American Chemical Society (ACS)
Date: 25-01-2019
DOI: 10.1021/ACS.BIOMAC.8B01692
Abstract: A series of thermoresponsive graft copolymers, gelling at physiological conditions in aqueous solution and cell growth media, have been synthesized using quantitative coupling between a small set of amino-functionalized poly(alkylene oxide) copolymers (PAO) and the carboxylate of the biologically important polysaccharides (PSa) carboxymethylcellulose and the less reactive hyaluronate. Quantitative grafting enables the establishment of structure-function relationship which is imperative for controlling the properties of in situ gelling hydrogels. The EDC/NHS-mediated reaction was monitored using SEC-MALLS, which revealed that all PAOs were grafted onto the PSa backbone. Aqueous solutions of the graft copolymers were Newtonian fluids at room temperatures and formed reversible physical gels at elevated temperatures which were noncytotoxic toward chondrocytes. The established structure-function relationship was most clearly demonstrated by inspecting the thermogelling strength and the onset of thermogelling in a phase diagram. The onset of the thermogelling function could be controlled by the global PAO concentration, independent of graft ratio.
Influence of solvents and substrates on the morphology and the performance of low-bandgap polyfluorene: PCBM photovoltaic devices
Publisher: SPIE
Date: 21-04-2006
DOI: 10.1117/12.662857
Improved performance and life time of inverted organic photovoltaics by using polymer interfacial materials
Publisher: Elsevier BV
Date: 02-2015
Engineering Two-Phase and Three-Phase Microstructures from Water-Based Dispersions of Nanoparticles for Eco-Friendly Polymer Solar Cell Applications
Publisher: American Chemical Society (ACS)
Date: 17-08-2018
Interactions between a luminescent conjugated polyelectrolyte and amyloid fibrils investigated with flow linear dichroism spectroscopy
Publisher: Elsevier BV
Date: 04-2011
DOI: 10.1016/J.BBRC.2011.03.132
Abstract: Luminescent conjugated polyelectrolytes (LCPs) have emerged as novel stains to detect and distinguish between various amyloidogenic species, including prefibrillar aggregates and mature fibril deposits, both in vitro and in histological tissue s les, offering advantages over traditional amyloid stains. We here use linear dichroism (LD) spectroscopy under shear alignment to characterize interactions between the LCP poly(3-thiophene acetic acid) (PTAA) and amyloid fibrils. The positive signature in the LD spectrum of amyloid-bound PTAA suggests that it binds in the grooves between adjacent protein side-chains in the amyloid fibril core, parallel to the fibril axis, similar to thioflavin-T and congo red. Moreover, using LD we record the absorption spectrum of amyloid-bound PTAA in isolation from free dye showing a red-shift by ca 30 nm compared to in solution. This has important implications for the use of PTAA as an amyloid probe in situ and in vitro and we demonstrate how to obtain optimal amyloid-specific fluorescence read-outs using PTAA. We use the shift in maximum absorption to estimate the fraction of bound PTAA at a given concentration. PTAA binding reaches saturation when added in 36 times excess and at this concentration the PTAA density is 4-5 monomer units per insulin monomer in the fibril. Finally, we demonstrate that changes in LD intensity can be related to alterations in persistence length of amyloid fibrils resulting from changes in solution conditions, showing that this technique is useful to assess macroscopic properties of these biopolymers.
Integration of amyloid nanowires in organic solar cells
Publisher: AIP Publishing
Date: 14-07-2008
DOI: 10.1063/1.2949073
Abstract: Amyloid nanowires were incorporated in organic photovoltaic devices in order to enhance the transport properties. Amyloid fibrils act as a template for donor-acceptor materials. The current-voltage characteristics under illumination and in the dark display a maximum for the fill factor and the space charge limit current, respectively, at an amyloid nanowire-donor-acceptor mass ratio of 0.014:1:1, associated to a better charge transport in the donor-acceptor domains. The absorption experiments display a redshift associated to a more planar polymer backbone with increasing concentration of amyloid fibrils. Amyloid nanowires present a significant effect on the donor-acceptor materials organization.
Luminescence quenching by inter-chain aggregates in substituted polythiophenes
Publisher: Elsevier BV
Date: 10-2001
Trapping Light in Polymer Photodiodes with Soft Embossed Gratings
Publisher: Wiley
Date: 02-2000
DOI: 10.1002/(SICI)1521-4095(200002)12:3<189::AID-ADMA189>3.0.CO;2-2
Efficient Near‐Infrared Electroluminescence at 840 nm with “Metal‐Free” Small‐Molecule:Polymer Blends
Publisher: Wiley
Date: 10-07-2018
Abstract: Due to the so-called energy-gap law and aggregation quenching, the efficiency of organic light-emitting diodes (OLEDs) emitting above 800 nm is significantly lower than that of visible ones. Successful exploitation of triplet emission in phosphorescent materials containing heavy metals has been reported, with OLEDs achieving remarkable external quantum efficiencies (EQEs) up to 3.8% (peak wavelength > 800 nm). For OLEDs incorporating fluorescent materials free from heavy or toxic metals, however, we are not aware of any report of EQEs over 1% (again for emission peaking at wavelengths > 800 nm), even for devices leveraging thermally activated delayed fluorescence (TADF). Here, the development of polymer light-emitting diodes (PLEDs) peaking at 840 nm and exhibiting unprecedented EQEs (in excess of 1.15%) and turn-on voltages as low as 1.7 V is reported. These incorporate a novel triazolobenzothiadiazole-based emitter and a novel indacenodithiophene-based transport polymer matrix, affording excellent spectral and transport properties. To the best of knowledge, such values are the best ever reported for electroluminescence at 840 nm with a purely organic and solution-processed active layer, not leveraging triplet-assisted emission.
On the desired properties of a conjugated polymer-electrolyte blend in a light-emitting electrochemical cell
Publisher: Elsevier BV
Date: 10-2008
Donor and acceptor behavior in a polyfluorene for photovoltaics
Publisher: American Chemical Society (ACS)
Date: 14-03-2007
DOI: 10.1021/JP068536F
Mechanism of Organic Solar Cell Performance Degradation upon Thermal Annealing of MoOx
Publisher: American Chemical Society (ACS)
Date: 03-12-2020
Multi-Edge Resonant Tender X-ray Diffraction for Probing the Crystalline Packing of Conjugated Polymers
Publisher: American Chemical Society (ACS)
Date: 26-05-2022
Light-Emitting Electrochemical Cells from Oligo(ethylene oxide)-Substituted Polythiophenes: Evidence for in Situ Doping
Publisher: American Chemical Society (ACS)
Date: 27-10-1999
DOI: 10.1021/CM991052U
Modification of the Surface Composition of PTB7-Th: ITIC Blend Using an Additive
Publisher: MDPI AG
Date: 26-09-2022
DOI: 10.3390/MOLECULES27196358
Abstract: We investigated the effect of adding p-anisaldehyde (AA) solvent to the ink containing poly[[2,60-4,8-di(5-ethylhexylthienyl)benzo[1,2-b:3,3-b]dithiophene][3-fluoro-2[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]](PTB7-Th) and 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:20,30-d0]-s-indaceno[1,2-b:5,6-b0]-dithiophene(ITIC) on the morphology of the active layer. The present study focuses on determining the effect of the additive on the compositions at the surface of the PTB7-Th: ITIC composite and its morphology, forming one side of the interface of the blend with the MoOX electrode, and the influence of the structural change on the performance of devices. Studies of device performance show that the addition of the additive AA leads to an improvement in device performance. Upon the addition of AA, the concentration of PTB7-Th at the surface of the bulk heterojunction (BHJ) increases, causing an increase in surface roughness of the surface of the BHJ. This finding contributes to an understanding of the interaction between the donor material and high work function electrode/interface material. The implications for the interface are discussed.
Photoluminescence and electroluminescence of films from soluble PPV-polymers
Publisher: Elsevier BV
Date: 03-1997
High Quantum Efficiency Polythiophene
Publisher: Wiley
Date: 07-1998
DOI: 10.1002/(SICI)1521-4095(199807)10:10<774::AID-ADMA774>3.0.CO;2-J
Nanomorphology of Bulk Heterojunction Organic Solar Cells in 2D and 3D Correlated to Photovoltaic Performance
Publisher: American Chemical Society (ACS)
Date: 05-06-2009
DOI: 10.1021/MA802457V
Alternating Polyfluorenes Collect Solar Light in Polymer Photovoltaics
Publisher: American Chemical Society (ACS)
Date: 16-10-2009
DOI: 10.1021/AR900073S
Abstract: The effort to improve the energy conversion efficiency of polymer solar cells has led to the design of novel donor polymers. To improve open circuit photovoltages (OCVs) and the spectral coverage of the solar spectrum, researchers have looked for materials with high HOMO values, an easily modified electronic structure, and sufficient electronic transport within the polymers. One advance in design from our laboratories has been the development of a class of alternating polyfluorene copolymers (APFOs), which can be combined with fullerenes to make bulk heterojunction materials for photovoltaic conversion. This Account describes copolymers of fluorene that we designed to expand the range the optical absorption of solar cells to include wavelengths out to 1000 nm. In most cases, we combine these polymers with acceptors from the fullerene family, typically the phenyl C(61) butyric acid methyl ester (PCBM) molecule, to generate solar cell materials. The synthesis of alternating copolymers of fluorene with various donor-acceptor-donor elements provides the opportunity to shift both HOMO and LUMO, which we have followed by electrochemical spectroscopy. Moving the LUMO of the APFOs farther from the vacuum level eventually leads to a situation where the driving force for photo-induced charge transfer from polymer donor to fullerene acceptor goes to zero, resulting in inefficient charge generation. Moving the HOMO level closer to the vacuum level reduces the OCV of devices made from bulk heterojunction blends. As we move the bandgap toward lower energies and increase the overlap of optical absorption with the solar spectrum, both these events eventually occur. In devices based on these APFO/fullerene blends, the performance depends on the OCV, the photocurrent under solar illumination, and the fill factor. The fill factor is influenced by electrical transport and charge generation. Optimizing these parameters requires new solutions to the perennial conflict between optically thin devices, where electrical extraction of charge is not a limitation, and the optically thick devices, where extraction of charge is h ered by trapping and recombination. As a result, we have developed methods to trap light in optically thin devices. When the thin film flexible solar cells are folded, multiple reflection between adjacent solar cells leads to a longer path length for the photon through the devices and considerable improvement of the optical dissipation in the active material. These optical tricks also enable an alternative route to tandem devices, where two different bandgap materials are located on adjacent folds. Thus light not absorbed in one cell is reflected onto the next cell to produce an effective optical series arrangement. Using experiments and simulations of the light trapping effects, we demonstrate power conversion efficiency enhancements of up to a factor of 1.8.
High shear in situ exfoliation of 2D gallium oxide sheets from centrifugally derived thin films of liquid gallium
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NA00598G
Abstract: Ultrathin gallium oxide sheets formed under continuous flow from gallium metal are highly insulating with electrocatalytic activity for hydrogen evolution.
Lasing in substituted polythiophene between dielectric mirrors
Publisher: Elsevier BV
Date: 06-1999
Correction to “A New Tetracyclic Lactam Building Block for Thick, Broad-Bandgap Photovoltaics”
Publisher: American Chemical Society (ACS)
Date: 06-01-2015
DOI: 10.1021/JA512173J
Near‐Infrared Polymer Light‐Emitting Diodes Based on Low‐Energy Gap Oligomers Copolymerized into a High‐Gap Polymer Host
Publisher: Wiley
Date: 02-04-2013
Abstract: Near-infrared (NIR) polymer light-emitting diodes (PLEDs) based on a fluorene-dioctyloxyphenylene wide-gap host material copolymerized with a low-gap emitter are presented. Various loadings (1, 2.5, 10, 20 mol%) of the low-gap emitter are studied, with higher loadings leading to decreased efficiencies likely due to aggregation effects. While the 10 mol% loading resulted in almost pure NIR emission (>99.6%), the 1 mol% loading yielded optimum device performance, which is among the best reported to date for a unblended single-layer pure polymer emitter, with an external quantum efficiencies of 0.04% emitting at 909 nm. The high spectral purity of the PLEDs combined with their performance support the methodology of copolymerization as an effective strategy for developing NIR PLEDs.
Diffusion-Limited Crystallization: A Rationale for the Thermal Stability of Non-Fullerene Solar Cells
Publisher: American Chemical Society (ACS)
Date: 07-06-2019
Abstract: Organic solar cells are thought to suffer from poor thermal stability of the active layer nanostructure, a common belief that is based on the extensive work that has been carried out on fullerene-based systems. We show that a widely studied non-fullerene acceptor, the indacenodithienothiophene-based acceptor ITIC, crystallizes in a profoundly different way as compared to fullerenes. Although fullerenes are frozen below the glass-transition temperature T
Intra- and Interchain Luminescence in Amorphous and Semicrystalline Films of Phenyl-Substituted Polythiophene
Publisher: American Chemical Society (ACS)
Date: 19-07-2001
DOI: 10.1021/JP010511N
An Easily Synthesized Blue Polymer for High‐Performance Polymer Solar Cells
Publisher: Wiley
Date: 08-09-2010
2D π-conjugated benzo[1,2-b:4,5-b′]dithiophene- and quinoxaline-based copolymers for photovoltaic applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3RA44238A
25th Anniversary Article: Isoindigo‐Based Polymers and Small Molecules for Bulk Heterojunction Solar Cells and Field Effect Transistors
Publisher: Wiley
Date: 12-02-2014
Abstract: Driven by the potential advantages and promising applications of organic solar cells, donor-acceptor (D-A) polymers have been intensively investigated in the past years. One of the strong electron-withdrawing groups that were widely used as acceptors for the construction of D-A polymers for applications in polymer solar cells and FETs is isoindigo. The isoindigo-based polymer solar cells have reached efficiencies up to ∼7% and hole mobilities as high as 3.62 cm(2) V(-1) s(-1) have been realized by FETs based on isoindigo polymers. Over one hundred isoindigo-based small molecules and polymers have been developed in only three years. This review is an attempt to summarize the structures and properties of the isoindigo-based polymers and small molecules that have been reported in the literature since their inception in 2010. Focus has been given only to the syntheses and device performances of those polymers and small molecules that were designed for use in solar cells and FETs. Attempt has been made to deduce structure-property relationships that would guide the design of isoindigo-based materials. It is expected that this review will present useful guidelines for the design of efficient isoindigo-based materials for applications in solar cells and FETs.
Inverted all-polymer solar cells based on a quinoxaline–thiophene/naphthalene-diimide polymer blend improved by annealing
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA00531D
Abstract: Thermal annealing on TQ1:N2200 all-polymer solar cells leads to higher photocurrent, fill factor, and almost doubled efficiency. Current maps from conductive-AFM are shown.
Unravelling the Thermomechanical Properties of Bulk Heterojunction Blends in Polymer Solar Cells
Publisher: American Chemical Society (ACS)
Date: 03-04-2017
Very Low Band Gap Thiadiazoloquinoxaline Donor–Acceptor Polymers as Multi-tool Conjugated Polymers
Publisher: American Chemical Society (ACS)
Date: 14-01-2014
DOI: 10.1021/JA410527N
Abstract: Here we report on the synthesis of two novel very low band gap (VLG) donor-acceptor polymers (Eg ≤ 1 eV) and an oligomer based on the thiadiazoloquinoxaline acceptor. Both polymers demonstrate decent ambipolar mobilities, with P1 showing the best performance of ∼10(-2) cm(2) V(-1) s(-1) for p- and n-type operation. These polymers are among the lowest band gap polymers (≲0.7 eV) reported, with a neutral λmax = 1476 nm (P2), which is the farthest red-shifted λmax reported to date for a soluble processable polymer. Very little has been done to characterize the electrochromic aspects of VLG polymers interestingly, these polymers actually show a bleaching of their neutral absorptions in the near-infrared region and have an electrochromic contrast up to 30% at a switching speed of 3 s.
Predicting thermal stability of organic solar cells through an easy and fast capacitance measurement
Publisher: Elsevier BV
Date: 10-2015
Efficient red electroluminescence from diketopyrrolopyrrole copolymerised with a polyfluorene
Publisher: AIP Publishing
Date: 09-2013
DOI: 10.1063/1.4820433
Abstract: We report the synthesis, characterization, and device incorporation of copolymers based on a common green-emitting polyfluorene but containing a small proportion of a low energy gap donor-acceptor-donor unit for red emission in photo- and electro-luminescence. At just 1%–3% random incorporation, the low-gap unit is not present on all chains, yet we demonstrate that efficient charge and energy transfer can yield electroluminescent devices with 1% quantum efficiency and a color that can be tuned by adjusting the density of low-gap units to achieve primary red (National Television System Committee). The high current density tail off in the efficiency is reduced by replacing the hole-injection layer with a photochemically cross-linked electron‑blocking layer.
Luminescence probing of crystallization in a polymer film
Publisher: AIP Publishing
Date: 15-06-2000
DOI: 10.1063/1.373577
Abstract: We report studies of a thin film multilayer stack including a highly emissive substituted polythiophene, poly[3-(2,5-dioctylphenyl)thiophene]. Analysis of the photoluminescence spectra revealed an inhomogeneous polymer film. X-ray diffraction studies attribute the existence of an inhomogeneous film as originating from crystallization of the polymer. We used the interference effect of light to detect the region of crystallization in the film. Photoluminescence and absorption were redshifted upon crystallization and displayed an enhanced vibronic structure. Comparison between calculated and measured photoluminescence shows that the crystallization starts from the top of the film and not from the supporting substrate.
Polarized electroluminescence from an oriented substituted polythiophene in a light emitting diode
Publisher: Wiley
Date: 1119
Isothermal Crystallization Kinetics and Time–Temperature–Transformation of the Conjugated Polymer: Poly(3-(2′-ethyl)hexylthiophene)
Publisher: American Chemical Society (ACS)
Date: 27-06-2017
Photodiode performance and nanostructure of polythiophene/C60blends
Publisher: Wiley
Date: 1997
Polymer Solar Cells Based on a Low-Bandgap Fluorene Copolymer and a Fullerene Derivative with Photocurrent Extended to 850 nm
Publisher: Wiley
Date: 26-04-2005
Counter-Ion Induced Solubility of Polypyridines
Publisher: Elsevier BV
Date: 06-1999
The electronic states of polyfluorene copolymers with alternating donor-acceptor units
Publisher: AIP Publishing
Date: 13-12-2004
DOI: 10.1063/1.1817873
Abstract: We calculate the electronic states of the low bandgap polyfluorene-based copolymer DiO-PFDTBT, which consists of alternating 9,9-dioctyl-9H-fluorene and 4,7-di-thiophen-2-ylbenzo[1,2,5]thiadiazole (TBT) units, and compare with the steady-state absorption, emission, and excitation spectrum. Using the semiempirical quantum-chemical (ZINDO) method we can assign the characteristic bands of the “camel-back” absorption spectrum to one charge transfer state at lower energy localized on the TBT unit, and one delocalized excitonic state at higher energy corresponding to the π-conjugated electron system. Additional “dark” charge transfer states in the gap between these bands have been revealed. Calculations are also made on the red light emitting polyfluorene-based copolymer poly(fluorene-co-benzothiadiazole) (F8BT), which contains benzo[1,2,5]thiadiazole instead of TBT. The nature of the electronic states in F8BT and DiO-PFDTBT are found to be qualitatively the same.
Observation of stimulated emission and ultrafast transient absorption dynamics from a novel alkyl-substituted PPV
Publisher: Elsevier BV
Date: 1997
Electrochemical and optical studies of the band gaps of alternating polyfluorene copolymers
Publisher: Elsevier BV
Date: 04-2006
Multilayer formation in spin-coated thin films of low-bandgap polyfluorene:PCBM blends
Publisher: IOP Publishing
Date: 02-12-2005
An alternating copolymer of fluorene donor and quinoxaline acceptor versus a terpolymer consisting of fluorene, quinoxaline and benzothiadiazole building units: synthesis and characterization
Publisher: Springer Science and Business Media LLC
Date: 29-10-2015
X-RAY STRUCTURAL STUDIES OF VARIOUS OCTYL-SUBSTITUTED POLYTHIOPHENES
Publisher: Wiley
Date: 02-1995
Fullerene Nucleating Agents: A Route Towards Thermally Stable Photovoltaic Blends
Publisher: Wiley
Date: 04-03-2014
Adsorption and reactions of O2and D2on small free palladium clusters in a cluster-molecule scattering experiment
Publisher: IOP Publishing
Date: 04-08-2010
DOI: 10.1088/0953-8984/22/33/334223
Abstract: The adsorption of oxygen and hydrogen (deuterium) on small neutral palladium clusters was investigated in a cluster beam experiment. The beam passes through two low-pressure reaction cells, and the clusters, with and without adsorbed molecules, are detected using laser ionization and mass spectrometry. Both H(2) and O(2) adsorb efficiently on the palladium clusters with only moderate variations with cluster size in the investigated range, i.e. between 8 and 28 atoms. The co-adsorption of H(2) and O(2) results in the formation of H(2)O, detected as a decrease in the number of adsorbed oxygen atoms with an increasing number of collisions with H(2) molecules. A comparison is done with an earlier similar study of clusters of Pt. Furthermore a comparison is done with what is known for sticking and reactivity of surfaces.
Novel rhodanine based molecular acceptor for organic solar cells
Publisher: EDP Sciences
Date: 2017
Continuous Flow Fabrication of MoS2 Scrolls for Electrocatalytic Hydrogen Evolution
Publisher: American Chemical Society (ACS)
Date: 11-07-0007
Reducing pressure fluctuations at high loads by means of charge stratification in HCCI combustion with negative valve overlap
Publisher: SAE International
Date: 15-06-2009
DOI: 10.4271/2009-01-1785
Achieving High-Efficiency Organic Photovoltaics from a New Completely Amorphous Donor Polymer
Publisher: American Chemical Society (ACS)
Date: 26-05-2022
High photovoltage achieved in low band gap polymer solar cells by adjusting energy levels of a polymer with the LUMOs of fullerene derivatives
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B811957K
Comparison of selenophene and thienothiophene incorporation into pentacyclic lactam-based conjugated polymers for organic solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5PY01245G
Abstract: In this work, we compare the effect of incorporating selenophene versus thienothiophene spacers into pentacyclic lactam-based conjugated polymers for organic solar cells.
Synthesis and characterization of soluble high molecular weight phenylsubstituted ppv-derivatives
Publisher: Elsevier BV
Date: 05-1999
Enhanced Photocurrent Spectral Response in Low‐Bandgap Polyfluorene and C70‐Derivative‐Based Solar Cells
Publisher: Wiley
Date: 16-08-2005
Influence of disorder on the photoinduced excitations in phenyl substituted polythiophenes
Publisher: AIP Publishing
Date: 15-10-2001
DOI: 10.1063/1.1404984
Abstract: Regioregular poly(3-(4′-(1″,4″,7″-trioxaoctyl)phenyl)thiophenes) (PEOPTs) exhibit interesting properties for the use in polymer electronics. Exposing thin films of the amorphous, disordered phase (orange phase) of the “as prepared” polymer to chloroform vapor or annealing them by heat treatment results in a redshift of the absorption maximum due to the formation of nanocrystals in an ordered phase (blue phase). As such, PEOPT thus is a very interesting conjugated polymeric material, which exhibits two different phases with well-defined order/disorder characters on one-and-the-same material. This property opens up the unique possibility to investigate the role of order/disorder on the photoexcited pattern without being obscured by the differences in chemical structure by using different materials with different crystallinity. The fact, that blue phase PEOPT exhibits absorption edges at relatively low energies around 1.8 eV, thereby demonstrating an enhanced spectral absorption range as compared to the orange phase, makes them attractive for use in photodiodes and solar cells as well. The photoinduced charge generation efficiency in both phases of PEOPT is significantly enhanced by the addition of a strong electron acceptor such as fullerene C60, as observed by quenching of the luminescence and by photoinduced absorption measurements in the infrared and uv–visible regime. The average number and the lifetime of photoinduced carriers in composites of PEOPT with a methanofullerene [6,6]-phenyl C61–butyric acid methyl ester (PCBM) are found to depend on the crystallinity of PEOPT in thin films, which gives rise to charged photoexcitations delocalized between polymer chains. Stronger bimolecular recombination in composites of the blue phase PEOPT with PCBM is observed as compared to the orange phase PEOPT/PCBM films. The origin of this enhanced recombination is found to be related to the hole mobility of the polymer.
Polymer solar cells based on MEH-PPV and PCBM
Publisher: Elsevier BV
Date: 04-2003
Copper Metallopolymer Catalyst for the Electrocatalytic Hydrogen Evolution Reaction (HER)
Publisher: MDPI AG
Date: 10-01-2019
Abstract: Conjugated polymers with stabilizing coordination units for single-site catalytic centers are excellent candidates to minimize the use of expensive noble metal electrode materials. In this study, conjugated metallopolymer, POS[Cu], was synthesized and fully characterized by means of spectroscopical, electrochemical, and photophysical methods. The copper metallopolymer was found to be highly active for the electrocatalytic hydrogen generation (HER) in an aqueous solution at pH 7.4 and overpotentials at 300 mV vs. reversible hydrogen electrode (RHE). Compared to the platinum electrode, the obtained overpotential is only 100 mV higher. The photoelectrochemical tests revealed that the complexation of the conjugated polymer POS turned its intrinsically electron-accepting (p-type) properties into an electron-donor (n-type) with photocurrent responses ten times higher than the organic photoelectrode.
Formation and Charge Transport Properties of P(NDI2OD-T2) Thin Films with End-on Oriented Form III Crystallites
Publisher: American Chemical Society (ACS)
Date: 12-07-2023
Electrochemical and Photophysical Properties of a Novel Polythiophene with Pendant Fulleropyrrolidine Moieties: Toward “Double Cable” Polymers for Optoelectronic Devices
Publisher: American Chemical Society (ACS)
Date: 11-12-2001
DOI: 10.1021/JP013077Y
Improving Cathodes with a Polymer Interlayer in Reversed Organic Solar Cells
Publisher: Wiley
Date: 24-06-2014
Synthesis and properties of polyfluorenes with phenyl substituents
Publisher: Elsevier BV
Date: 09-2005
Interference phenomenon determines the color in an organic light emitting dio
Publisher: AIP Publishing
Date: 15-06-1997
DOI: 10.1063/1.365418
Abstract: We report on electroluminescence from two-layer organic diodes made of poly(3-methyl-4-octylthiophene) and 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,2,4-oxadiazole films between electrodes of indium tin oxide and Ca/Al. The diodes emitted light in the green-blue range the electroluminescence spectra varied between diodes with different thicknesses of the polymer and molecular layers. The optical phenomena were simulated with a model accounting for interference effects simulated results showed that the electroluminescence from the organic diode can be due neither to luminescence of the polymer nor of the molecular layer. These model simulations, together with electrochemical measurements, can be interpreted as evidence for an indirect optical transition at the polymer/molecule interface that only occurs in a strong electric field. We label this transition an electroplex.
Red-Light-Mediated Photocatalytic Hydrogen Evolution by Hole Transfer from Non-Fullerene Acceptor Y6
Publisher: American Chemical Society (ACS)
Date: 23-08-2022
Blue-to-transmissive electrochromic switching of solution processable donor–acceptor polymers
Publisher: Elsevier BV
Date: 08-2011
Optical emission from confined poly(thiophene) chains
Publisher: Elsevier BV
Date: 1998
Thia- and selena-diazole containing polymers for near-infrared light-emitting diodes
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TC00118H
Abstract: Incorporation of a class of selenium-based near-infrared emitters (benzotriazoloselenadiazoles) into PLEDs and direct comparison between thia- and selena-diazole donor–acceptor–donor units.
Polymer solar cells with low-bandgap polymers blended with C70-derivative give photocurrent at 1 μm
Publisher: Elsevier BV
Date: 07-2006
Device Performance of APFO-3/PCBM Solar Cells with Controlled Morphology
Publisher: Wiley
Date: 20-11-2009
Abstract: Polymer/fullerene solar cells with three different device structures: A) diffuse bilayer, B) spontaneously formed multilayer, and C) vertically homogenous thin films, are fabricated. The photocurrent/voltage performance is compared and it is found that the self-stratified structure (B) yields the highest energy conversion efficiency.
Tailored Side-Chain Architecture of Benzil Voltage Stabilizers for Enhanced Dielectric Strength of Cross-Linked Polyethylene
Publisher: Wiley
Date: 09-06-2014
DOI: 10.1002/POLB.23523
An Easily Accessible Isoindigo-Based Polymer for High-Performance Polymer Solar Cells
Publisher: American Chemical Society (ACS)
Date: 22-08-2011
DOI: 10.1021/JA206610U
Abstract: A new, low-band-gap alternating copolymer consisting of terthiophene and isoindigo has been designed and synthesized. Solar cells based on this polymer and PC(71)BM show a power conversion efficiency of 6.3%, which is a record for polymer solar cells based on a polymer with an optical band gap below 1.5 eV. This work demonstrates the great potential of isoindigo moieties as electron-deficient units for building donor-acceptor-type polymers for high-performance polymer solar cells.
Self organised polymer photodiodes for extended spectral coverage
Publisher: Elsevier BV
Date: 03-2000
High‐Performance Hole Transport and Quasi‐Balanced Ambipolar OFETs Based on D–A–A Thieno‐benzo‐isoindigo Polymers
Publisher: Wiley
Date: 28-01-2016
Cyclic Copper Uptake and Release from Natural Seawater—A Fully Sustainable Antifouling Technique to Prevent Marine Growth
Publisher: American Chemical Society (ACS)
Date: 18-12-2021
Effect of Alkyl Side Chain Length on Intra- and Intermolecular Interactions of Terthiophene–Isoindigo Copolymers
Publisher: American Chemical Society (ACS)
Date: 14-04-2020
High Performance All-Polymer Photodetector Comprising a Donor–Acceptor–Acceptor Structured Indacenodithiophene–Bithieno[3,4-c]Pyrroletetrone Copolymer
Publisher: American Chemical Society (ACS)
Date: 14-03-2018
DOI: 10.1021/ACSMACROLETT.8B00009
Abstract: The synthesis of an acceptor polymer PIDT-2TPD, comprising indacenodithiophene (IDT) as the electron-rich unit and an interconnected bithieno[3,4-
Influence of Incorporating Different Electron-Rich Thiophene-Based Units on the Photovoltaic Properties of Isoindigo-Based Conjugated Polymers: An Experimental and DFT Study
Publisher: American Chemical Society (ACS)
Date: 16-10-2013
DOI: 10.1021/MA401691R
High electron affinity: a guiding criterion for voltage stabilizer design
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4TA04956J
Abstract: A high electron affinity is found to correlate with the ability of voltage-stabilizer additives to improve the dielectric strength of cross-linked polyethylene, which is a highly desirable for high-voltage insulation materials.
Electron and Hole Contributions to the Terahertz Photoconductivity of a Conjugated Polymer:Fullerene Blend Identified
Publisher: American Chemical Society (ACS)
Date: 21-08-2012
DOI: 10.1021/JZ301013U
Abstract: Time-resolved terahertz spectroscopy was employed for the investigation of charge-transport dynamics in benzothiadiazolo-dithiophene polyfluorene ([2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)]) (APFO-3) polymers with various chain lengths and in its monomer form, all blended with an electron acceptor ([6,6]-phenyl-C61-butyric acid methyl ester, PCBM). Upon photoexcitation, charged polaron pairs are created, negative charges are transferred to fullerenes, while positive polarons remain on polymers/monomers. Vastly different hole mobility in polymer and monomer blends allows us to distinguish the hole and electron contributions to the carrier mobility.
Two-in-one: cathode modification and improved solar cell blend stability through addition of modified fullerenes
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5TA06420A
Abstract: Addition of customised fullerenes to a polymer : fullerene bulk-heterojunction blend significantly increases the efficiency and the thermal stability after annealing at 140 °C.
Self organizing polymer films—a route to novel electronic devices based on conjugated polymers
Publisher: Elsevier BV
Date: 03-1997
Photoinduced Electron Transfer in Donor−Acceptor Double-Cable Polymers: Polythiophene Bearing Tetracyanoanthraquinodimethane Moieties
Publisher: American Chemical Society (ACS)
Date: 07-04-2001
DOI: 10.1021/JP0037448
Observation of a Charge Transfer State in Low-Bandgap Polymer/Fullerene Blend Systems by Photoluminescence and Electroluminescence Studies
Publisher: Wiley
Date: 23-10-2009
Thin film transistors and light-emitting diodes based on donor-acceptor-donor polymers
Publisher: SPIE
Date: 18-10-2004
DOI: 10.1117/12.561389
A Soluble Donor-Acceptor Double-Cable Polymer: Polythiophene with Pendant Fullerenes
Publisher: Springer Science and Business Media LLC
Date: 03-2003
Polymer Photovoltaic Cells with Conducting Polymer Anodes
Publisher: Wiley
Date: 03-05-2002
DOI: 10.1002/1521-4095(20020503)14:9<662::AID-ADMA662>3.0.CO;2-N
Reassessing the Significance of Reduced Aggregation and Crystallinity of Naphthalene Diimide-Based Copolymer Acceptors in All-Polymer Solar Cells
Publisher: American Chemical Society (ACS)
Date: 28-03-2022
A Facile Method to Enhance Photovoltaic Performance of Benzodithiophene‐Isoindigo Polymers by Inserting Bithiophene Spacer
Publisher: Wiley
Date: 18-11-2013
Photoinduced Charge Transfer and Efficient Solar Energy Conversion in a Blend of a Red Polyfluorene Copolymer with CdSe Nanoparticles
Publisher: American Chemical Society (ACS)
Date: 19-07-2006
DOI: 10.1021/NL061085Q
Abstract: We present measurements of charge transfer and the photovoltaic effect in a blend of the alternating polyfluorene copolymer poly(2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)) with branched CdSe nanoparticles. Quasi-steady-state photoinduced absorption measurements identified a long-lived charged species that formed after photoexcitation at room temperature. Photovoltaic devices based on this blend system showed a spectral response extending to 650 nm and gave a solar power conversion efficiency of 2.4% under Air Mass 1.5 Global (AM1.5G) conditions.
Synthesis and properties of alternating polyfluorene copolymers with redshifted absorption for use in solar cells
Publisher: Elsevier BV
Date: 04-2003
Black Polymers in Bulk-Heterojunction Solar Cells
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2010
Influences of Surface Roughness of ZnO Electron Transport Layer on the Photovoltaic Performance of Organic Inverted Solar Cells
Publisher: American Chemical Society (ACS)
Date: 13-11-2012
DOI: 10.1021/JP308480U
Effect of Ageing on the Temperature Dependence of Conductivity of Poly(3-hexylthiophene) Doped by FeCl3
Publisher: Elsevier BV
Date: 08-1993
Ultraviolet electroluminescence from an organic light emitting diode
Publisher: Wiley
Date: 11-1995
Orange to green switching anthraquinone‐based electrochromic material
Publisher: Wiley
Date: 14-03-2019
DOI: 10.1002/APP.47729
The Influence of Alkoxy Substitutions on the Properties of Diketopyrrolopyrrole-Phenyl Copolymers for Solar Cells
Publisher: MDPI AG
Date: 22-07-2013
DOI: 10.3390/MA6073022
Continuous flow fabrication of green graphene oxide in aqueous hydrogen peroxide
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NA00310D
Abstract: Herein, we have established a sequential two step continuous flow process for generating graphene oxide with properties comparable to the conventional Hummers' GO. The process is high yielding and with a dramatic reduction in the generation of waste.
Introducing neat fullerenes to improve the thermal stability of slot-die coated organic solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2MA00120A
Abstract: Improved the thermal stability of PPDT2FBT:PC 61 BM organic solar cells fabricated via slot-die coating. This was achieved with the addition of neat fullerene C 70 to reduce the burn-in degradation associated with crystal growth of PCBM.
Characteristics of polythiophene surface light emitting diodes
Publisher: Elsevier BV
Date: 06-2000
Synthesis and characterization of poly(quinoxaline vinylene)s and poly(pyridopyrazine vinylene)s with phenyl substituted side-groups
Publisher: Elsevier BV
Date: 11-2002
Tracing charge transfer states in polymer:fullerene bulk-heterojunctions
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA11005B
Fluorescence light emission at 1eV from a conjugated polymer
Publisher: Elsevier BV
Date: 04-2010
Synthesis and characterization of benzodithiophene and benzotriazole-based polymers for photovoltaic applications
Publisher: Beilstein Institut
Date: 08-2016
DOI: 10.3762/BJOC.12.160
Abstract: Two high bandgap benzodithiophene–benzotriazole-based polymers were synthesized via palladium-catalysed Stille coupling reaction. In order to compare the effect of the side chains on the opto-electronic and photovoltaic properties of the resulting polymers, the benzodithiophene monomers were substituted with either octylthienyl (PTzBDT-1) or dihexylthienyl (PTzBDT-2) as side groups, while the benzotriazole unit was maintained unaltered. The optical characterization, both in solution and thin-film, indicated that PTzBDT-1 has a red-shifted optical absorption compared to PTzBDT-2, likely due to a more planar conformation of the polymer backbone promoted by the lower content of alkyl side chains. The different aggregation in the solid state also affects the energetic properties of the polymers, resulting in a lower highest occupied molecular orbital (HOMO) for PTzBDT-1 with respect to PTzBDT-2. However, an unexpected behaviour is observed when the two polymers are used as a donor material, in combination with PC 61 BM as acceptor, in bulk heterojunction solar cells. Even though PTzBDT-1 showed favourable optical and electrochemical properties, the devices based on this polymer present a power conversion efficiency of 3.3%, considerably lower than the efficiency of 4.7% obtained for the analogous solar cells based on PTzBDT-2. The lower performance is presumably attributed to the limited solubility of the PTzBDT-1 in organic solvents resulting in enhanced aggregation and poor intermixing with the acceptor material in the active layer.
Structural tuning of quinoxaline-benzodithiophene copolymers via alkyl side chain manipulation: synthesis, characterization and photovoltaic properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA01479K
Abstract: Effect of the alkyl side chain(s) on the optical, electronic, morphological and photovoltaic properties.
Low band gap donor–acceptor–donor polymers for infra-red electroluminescence and transistors
Publisher: Elsevier BV
Date: 11-2004
1 micron wavelength photo- and electroluminescence from a conjugated polymer
Publisher: AIP Publishing
Date: 20-04-2004
DOI: 10.1063/1.1737064
Abstract: We report photo- and electroluminescence from an alternating conjugated polymer consisting of fluorene units and low-band gap donor-acceptor-donor (D–A–D) units. The D–A–D segment includes two electron-donating thiophene rings combined with a thiadiazolo-quinoxaline unit, which is electron withdrawing to its nature. The resulting polymer is conjugated and has a band gap of 1.27 eV. The corresponding electro- and photoluminescence spectra both peak at approximately 1 μm. Light-emitting diodes, based on a single layer of the polymer, demonstrated external quantum efficiencies from 0.03% to 0.05%.
X-ray diffraction study of octylphenyl-substituted polythiophene
Publisher: Elsevier BV
Date: 03-1995
Photoluminescence Properties of Polythiophenes
Publisher: Elsevier BV
Date: 05-1999
Conductivity of oriented polyacetylene doped by alkali metals: Time, temperature, and pressure dependence
Publisher: American Physical Society (APS)
Date: 15-04-1993
Spectroscopic investigation of the different long-lived photoexcitations in a polythiophene
Publisher: AIP Publishing
Date: 30-05-2002
DOI: 10.1063/1.1478768
Abstract: Using time-resolved photoinduced transient absorption and gated emission techniques long-lived excitations of the solid-state conjugated polymer poly(3-methyl-4-octyl-thiophene) (PMOT) have been detected and analyzed at different temperatures. At 15 K phosphorescence and delayed fluorescence resulting from triplet and geminate pair decay, respectively, are observed. A redshifted emission (with respect to the prompt fluorescence) detected at ambient temperatures is assigned to excimer fluorescence. We also observed excitations with extremely long lifetimes of 300 ms at 289 K that we allocate to triplet excimer formation.
Conformational Disorder Enhances Solubility and Photovoltaic Performance of a Thiophene–Quinoxaline Copolymer
Publisher: Wiley
Date: 25-02-2013
Pyrrolo[3,4-g]quinoxaline-6,8-dione-based conjugated copolymers for bulk heterojunction solar cells with high photovoltages
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5PY00394F
Abstract: D–A copolymers incorporating new pyrrolo[3,4- g ]quinoxaline-6,8-dione (PQD) building blocks were synthesized for bulk heterojunction solar cells with high photovoltages.
Stimulated emission and lasing in solid films of conjugated polymers: ultrafast photophysics and photon confinement via scattering
Publisher: The Royal Society
Date: 15-04-1997
Nucleation-limited fullerene crystallisation in a polymer–fullerene bulk-heterojunction blend
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA11018D
Synthesis and Properties of a soluble conjugated poly(azomethine) with high molecular weight.
Publisher: American Chemical Society (ACS)
Date: 31-03-1998
DOI: 10.1021/MA9701090
Mixed solvents for reproducible photovoltaic bulk heterojunctions
Publisher: SPIE-Intl Soc Optical Eng
Date: 2011
DOI: 10.1117/1.3606393
Stoichiometry dependence of charge transport in polymer/methanofullerene and polymer/C70 derivative based solar cells
Publisher: Elsevier BV
Date: 08-2006
Lateral Phase Separation Gradients in Spin‐Coated Thin Films of High‐Performance Polymer:Fullerene Photovoltaic Blends
Publisher: Wiley
Date: 20-06-2011
9.0% power conversion efficiency from ternary all-polymer solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7EE01858D
Abstract: High-performance ternary all-polymer solar cells with outstanding efficiency of 9.0% are realized by incorporating two donor and one acceptor polymers with complementary absorption and proper energy level alignment.
Red and near infrared polarized light emissions from polyfluorene copolymer based light emitting diodes
Publisher: AIP Publishing
Date: 12-03-2007
DOI: 10.1063/1.2713139
Abstract: The authors report polarized red, electroluminescence peak at 705nm and near infrared, electroluminescence peak at 950nm, light emission from light emitting diodes based on two polyfluorene copolymers. The copolymers are synthesized from a fluorene monomer combined with donor-acceptor-donor comonomers and designed to have a low band gap and form birefringent liquid crystalline phases. Emission occurs from aligned thin films of polymer layers. The emissive layers are aligned by spin coating on a layer of rubbed conducting polymer poly(3,4-ethylene dioxythiophene)-poly(styrene sulphonate) and thermally converted into glassy nematic liquid crystalline state.
Green Electroluminescence in Poly-(3-cyclohexylthiophene) light-emitting diodes
Publisher: Wiley
Date: 06-1994
Synthesis of soluble poly(alkylthiophenes) which are thermally stable in the doped state
Publisher: Elsevier BV
Date: 03-1993
Geminate Charge Recombination in Polymer/Fullerene Bulk Heterojunction Films and Implications for Solar Cell Function
Publisher: American Chemical Society (ACS)
Date: 12-08-2010
DOI: 10.1021/JA104786X
Abstract: We have studied the influence of three different fullerene derivatives on the charge generation and recombination dynamics of polymer/fullerene bulk heterojunction (BHJ) solar cell blends. Charge generation in APFO3/[70]PCBM and APFO3/[60]PCBM is very similar and somewhat slower than charge generation in APFO3/[70]BTPF. This difference qualitatively matches the trend in free energy change of electron transfer estimated from the LUMO energies of the polymer and fullerene derivatives. The first order (geminate) charge recombination rate is significantly different for the three fullerene derivatives studied and increases in the order APFO3/[70]PCBM < APFO3/[60]PCBM < APFO3/[70]BTPF. The variation in electron transfer rate cannot be explained from the LUMO energies of the fullerene derivatives and single-step electron transfer in the Marcus inverted region and simple considerations of expected trends for the reorganization energy and free energy change. Instead we suggest that geminate charge recombination occurs from a state where electrons and holes have separated to different distances in the various materials because of an initially high charge mobility, different for different materials. In a BHJ thin film this charge separation distance is not sufficient to overcome the electrostatic attraction between electrons and holes and geminate recombination occurs on the nanosecond to hundreds of nanoseconds time scale. In a BHJ solar cell, we suggest that the internal electric field in combination with polarization effects and the dynamic nature of polarons are key features to overcome electron-hole interactions to form free extractable charges.
Enhanced Current Efficiency from Bio-Organic Light-Emitting Diodes Using Decorated Amyloid Fibrils with Conjugated Polymer
Publisher: American Chemical Society (ACS)
Date: 12-08-2008
DOI: 10.1021/NL801510Z
Abstract: We demonstrate the use of self-assembled bionanostructures in polymer light-emitting diodes. Amyloid fibrils formed by protein misfolding were decorated with a soluble luminescent conjugated polymer. This conjugated polymer complex with amyloid fibrils was used as the active layer in a light emitting diode, resulting in a 10-fold increase in external quantum efficiency compared with pristine polymer, because of improved carrier injection.
Low bandgap alternating polyfluorene copolymers in plastic photodiodes and solar cells
Publisher: Springer Science and Business Media LLC
Date: 06-2004
Synthesis and Characterization of Highly Soluble Phenyl-Substituted Poly(p-phenylenevinylenes)
Publisher: American Chemical Society (ACS)
Date: 15-03-2000
DOI: 10.1021/MA991582B
A Comparative Study on the Role of Polyvinylpyrrolidone Molecular Weight on the Functionalization of Various Carbon Nanotubes and Their Composites
Publisher: MDPI AG
Date: 25-07-2021
Abstract: Polyvinylidene fluoride (PVDF) nanocomposites filled with polyvinylpyrrolidone (PVP) wrapped carbon nanotubes were prepared via a solution casting technique. The effect of the molecular weight (polymer chain length) of the PVP on the ability to wrap different nanotube structures and its impact towards nanotube dispersibility in the polymer matrix was explored. The study was conducted with PVP of four different molecular weights and nanotubes of three different structures. The composites that exhibit an effective nanotube dispersion lead to a nanotube network that facilitates improved thermal, electrical, and mechanical properties. It was observed that nanotubes of different structures exhibit stable dispersions in the polymer matrix though PVP functionalization of different molecular weights, but the key is achieving an effective nanotube dispersion at low PVP concentrations. This is observed in MWNT and AP-SWNT based composites with PVP of low molecular weight, leading to a thermal conductivity enhancement of 147% and 53%, respectively, while for P3-SWNT based composites, PVP of high molecular weight yields an enhancement of 25% in thermal conductivity compared to the non-functionalized CNT-PVDF composite.
Semiconducting Polymers: A New Class of Solid-State Laser Materials
Publisher: American Association for the Advancement of Science (AAAS)
Date: 31-01-1206
The origin of pressure waves in high load HCCI combustion: A high-speed video analysis
Publisher: Informa UK Limited
Date: 11-2011
A New Application Area for Fullerenes: Voltage Stabilizers for Power Cable Insulation
Publisher: Wiley
Date: 12-12-2015
Abstract: Fullerenes are shown to be efficient voltage-stabilizers for polyethylene, i.e., additives that increase the dielectric strength of the insulation material. Such compounds are highly sought-after because their use in power-cable insulation may considerably enhance the transmission efficiency of tomorrow's power grids. On a molal basis, fullerenes are the most efficient voltage stabilizers reported to date.
High‐Performance and Stable All‐Polymer Solar Cells Using Donor and Acceptor Polymers with Complementary Absorption
Publisher: Wiley
Date: 20-03-2017
Electrical Tree Inhibition by Voltage Stabilizers.
Publisher: IEEE
Date: 10-2012
Electron Microscopy of Organic Solar Cells Thermally Stabilized with Fullerene Nucleating Agents
Publisher: Oxford University Press (OUP)
Date: 08-2014
Effect of electron-withdrawing side chain modifications on the optical properties of thiophene–quinoxaline acceptor based polymers
Publisher: Elsevier BV
Date: 02-2013
Synthesis and characterization of three small band gap conjugated polymers for solar cell applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0PY00152J
Chemical and Electronic Properties of PTB7-Th and ITIC on ZnO Interfaces in Organic Solar Cells
Publisher: American Chemical Society (ACS)
Date: 08-2023
Design, Synthesis and Computational Study of Fluorinated Quinoxaline-Oligothiophene-based Conjugated Polymers with Broad Spectral Coverage.
Publisher: Wiley
Date: 28-11-2018
Abstract: Donor-acceptor (D-A) copolymers typically show two absorption peaks in the visible region, flanking a valley region of limited absorptivity. One strategy for more panchromatic light harvesting is to incorporate side-groups orthogonal to the polymer backbone, which enable 2D π conjugation and can give rise to additional absorption peaks. Here we design and synthesize two D-A polymers which both carry a fluorinated quinoxaline acceptor unit, but while P1 includes a benzodithiophene donor moiety with thiophene side-groups (2D-BDT), the P2 polymer lacks 2D conjugation in its simpler pentathiophene donor segment. The P1 polymer consequently shows an atypical absorption profile with more panchromatic absorption with no apparent valley in the spectrum. In order to understand the structure-electronic relations, the optical and electrochemical properties were predicted using a previously developed computational approach. The predicted optical properties show very good agreement with the experimental results. Solar cells made from P1 show a short-circuit current more than twice as large as P2, attributed to its enhanced spectral coverage. However, poor fill factors limit the preliminary power conversion efficiencies to 3.3 % for P1 and 1.0 % for P2 as blended with PCBM[70] in a 1 : 1.5 (w/w) ratio.
Fullerene mixtures enhance the thermal stability of a non-crystalline polymer solar cell blend
Publisher: AIP Publishing
Date: 14-04-2014
DOI: 10.1063/1.4870997
Abstract: Printing of polymer:fullerene solar cells at high speed requires annealing at temperatures up to 140 °C. However, bulk-heterojunction blends that comprise a non-crystalline donor polymer often suffer from insufficient thermal stability and hence rapidly coarsen upon annealing above the glass transition temperature of the blend. In addition, micrometer-sized fullerene crystals grow, which are detrimental for the solar cell performance. In this manuscript, we present a strategy to limit fullerene crystallization, which is based on the use of fullerene mixtures of the two most common derivatives, PC61BM and PC71BM, as the acceptor material. Blends of this fullerene mixture and a non-crystalline thiophene-quinoxaline copolymer display considerably enhanced thermal stability and largely retain their photovoltaic performance upon annealing at elevated temperatures as high as 170 °C.
Poly(4-vinylpyridine): A New Interface Layer for Organic Solar Cells
Publisher: American Chemical Society (ACS)
Date: 14-03-2017
Abstract: Poly(4-vinylpyridine) (P4VP) was used as a cathode interface layer in inverted organic solar cells (OSCs) fabricated using poly[2,3-bis(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-diyl] (TQ1) and PC
Blue light-emitting diodes based on novel polyfluorene copolymers
Publisher: Elsevier BV
Date: 2007
The role of charge stratification for reducing ringing in gasoline engine homogeneous charge compression ignition combustion investigated by optical imaging
Publisher: SAGE Publications
Date: 03-2013
Abstract: Homogeneous charge compression ignition offers the possibility to reduce the fuel consumption of gasoline passenger car engines. However, the combustion strategy is limited to low loads due to pressure oscillations at higher loads. A strategy for extending the homogeneous charge compression ignition load range is charge stratification, using, for ex le, late direct injection to prolong the combustion duration and reduce the rate of pressure rises and pressure oscillations. In this study, local temperatures and fuel concentrations near top dead centre in a gasoline engine operating in homogeneous charge compression ignition mode were measured using two-wavelength planar laser-induced fluorescence, and the following combustion was analysed using high-speed video to investigate the effects of fuel and temperature stratification on combustion in order to explain the ringing inhibiting effect of charge stratification for fuels displaying single-stage ignition. The extent of spatial distribution of combustion timing correlated well with the extent of fuel and temperature stratification. Furthermore, the gas was leaner and hotter in early igniting regions, while it was richer and colder in late igniting regions. The d ening effects of charge stratification on the combustion speed and pressure oscillations are probably due to rich conditions in the latest burning regions (where combustion is usually most intense) slowing down combustion, which explains why the strategy only works when the global air-to-fuel ratio is not excessively lean.
Light-harvesting capabilities of low band gap donor–acceptor polymers
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4CP03191A
Abstract: The ability of three new and six existing donor–acceptor polymers to absorb strongly at low photon energies is studied experimentally and theoretically, and is related to their chemical structures.
Facile Synthesis of an Efficient and Robust Cathode Interface Material for Polymer Solar Cells
Publisher: American Chemical Society (ACS)
Date: 05-11-2018
Multifunctional polythiophenes in photodiodes
Publisher: Elsevier BV
Date: 06-1999
A New Tetracyclic Lactam Building Block for Thick, Broad-Bandgap Photovoltaics
Publisher: American Chemical Society (ACS)
Date: 06-08-2014
DOI: 10.1021/JA5051692
Abstract: A new tetracyclic lactam building block for polymer semiconductors is reported that was designed to combine the many favorable properties that larger fused and/or amide-containing building blocks can induce, including improved solid-state packing, high charge carrier mobility, and improved charge separation. Copolymerization with thiophene resulted in a semicrystalline conjugated polymer, PTNT, with a broad bandgap of 2.2 eV. Grazing incidence wide-angle X-ray scattering of PTNT thin films revealed a strong tendency for face-on π-stacking of the polymer backbone, which was retained in PTNT:fullerene blends. Corresponding solar cells featured a high open-circuit voltage of 0.9 V, a fill factor around 0.6, and a power conversion efficiency as high as 5% for >200 nm thick active layers, regardless of variations in blend stoichiometry and nanostructure. Moreover, efficiencies of >4% could be retained when thick active layers of ∼400 nm were employed. Overall, these values are the highest reported for a conjugated polymer with such a broad bandgap and are unprecedented in materials for tandem and particularly ternary blend photovoltaics. Hence, the newly developed tetracyclic lactam unit has significant potential as a conjugated building block in future organic electronic materials.
Polyfluorene copolymer based bulk heterojunction solar cells
Publisher: Elsevier BV
Date: 02-2004
Plastic lasers: Semiconducting polymers as a new class of solid-state laser materials
Publisher: Elsevier BV
Date: 2017
Polymer Photovoltaic Devices from Stratified Multilayers of Donor-Acceptor Blends
Publisher: Wiley
Date: 09-2000
DOI: 10.1002/1521-4095(200009)12:18<1367::AID-ADMA1367>3.0.CO;2-Z
Donor-Acceptor Polymers for Organic Photovoltaics
Publisher: CRC Press
Date: 27-03-2019
DOI: 10.1201/B22235-8
8.0% Efficient All‐Polymer Solar Cells with High Photovoltage of 1.1 V and Internal Quantum Efficiency near Unity
Publisher: Wiley
Date: 11-09-2017
An alternating low band-gap polyfluorene for optoelectronic devices
Publisher: Elsevier BV
Date: 05-2006
A polythiophene microcavity laser
Publisher: Elsevier BV
Date: 05-1998
“Plastic” lasers: Comparison of gain narrowing with a soluble semiconducting polymer in waveguides and microcavities
Publisher: AIP Publishing
Date: 16-06-1997
DOI: 10.1063/1.119156
Abstract: Gain narrowing and lasing from a soluble, highly photoluminescent conjugated polymer, poly(2-butyl, 5-(2′-ethyl-hexyl)-1,4-phenylene vinylene) (BuEH-PPV), are compared using two resonant structures: planar waveguides and microcavities. The gain narrowing and lasing thresholds are comparable, 0.05–0.1 μJ (10 ns pulse focused to ∼1.5 mm). Gain narrowing is not observed in films on indium tin oxide (ITO) unless a cladding layer is placed between the BuEH-PPV and ITO. Single-mode microcavity lasers are obtained when a cavity resonance occurs at the wavelength where the gain of the polymer is maximum.
Electrophosphorescence from substituted poly(thiophene) doped with iridium or platinum complex
Publisher: Elsevier BV
Date: 12-2004
Size-Dependent Carbon Monoxide Adsorption on Neutral Gold Clusters
Publisher: American Chemical Society (ACS)
Date: 22-11-2005
DOI: 10.1021/JP0556097
Abstract: We report on experiments probing the reactivity of neutral Au(n) clusters, n = 9-68, with carbon monoxide. The gold clusters are produced in a pulsed laser vaporization cluster source, operated at room temperature (RT) or at liquid-nitrogen temperature (LNT), pass through a low-pressure reaction cell containing CO gas, and are subsequently laser ionized. The reaction probabilities are determined by recording mass abundance spectra with time-of-flight mass spectrometry. The main observations are a strong temperature dependence and a remarkable size dependence. Upon cooling of the cluster source to LNT, the reactivity increases substantially. At LNT, the reaction probabilities for Au(n) with the first CO molecule are about a factor 10 higher than at RT. Moreover, adsorption of two, three, and even four CO molecules is observed, in contrast to RT clusters which at most adsorb one CO molecule. This temperature dependence is related to the lifetime of the cluster-molecule complexes, being much longer for cold clusters. The observed striking size dependence is similar at both temperatures and is discussed in terms of the electronic structure effects.
Multifunctional materials for OFETs, LEFETs and NIR PLEDs
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TC00342J
Abstract: Phthalimide–thiophene copolymers are multi-functional materials that possess reasonably high PLQEs, ambipolar mobilities, and perform extremely well as a host material for single layer NIR emitting PLEDs.
New low band gap alternating polyfluorene copolymer-based photovoltaic cells
Publisher: Elsevier BV
Date: 06-07-2007
Role of Molecular Weight in Polymer Wrapping and Dispersion of MWNT in a PVDF Matrix
Publisher: MDPI AG
Date: 17-01-2019
Abstract: The thermal and electrical properties of a polymer nanocomposite are highly dependent on the dispersion of the CNT filler in the polymer matrix. Non-covalent functionalisation with a PVP polymer is an excellent driving force towards an effective dispersion of MWNTs in the polymer matrix. It is shown that the PVP molecular weight plays a key role in the non-covalent functionalisation of MWNT and its effect on the thermal and electrical properties of the polymer nanocomposite is reported herein. The dispersion and crystallisation behaviour of the composite are also evaluated by a combination of scanning electron microscopy (SEM) and differential scanning calorimetry (DSC).
Thioxanthone derivatives as stabilizers against electrical breakdown in cross-linked polyethylene for high voltage cable applications
Publisher: Elsevier BV
Date: 02-2015
Tuning the bandgap for polymeric smart windows and displays
Publisher: Elsevier BV
Date: 10-1995
Recent Development of Quinoxaline Based Polymers/Small Molecules for Organic Photovoltaics
Publisher: Wiley
Date: 14-07-2017
Improved photoluminescence efficiency of films from conjugated polymers
Publisher: Elsevier BV
Date: 03-1997
The use of combinatorial materials development for polymer solar cells
Publisher: Wiley
Date: 2000
DOI: 10.1002/1099-0712(200003/04)10:2<47::AID-AMO397>3.0.CO;2-W
Photoluminescence quenching at a polythiophene/C60 heterojunction
Publisher: American Physical Society (APS)
Date: 15-05-2000
Recent progress in thin film organic photodiodes
Publisher: Elsevier BV
Date: 03-2001
Triazolobenzothiadiazole‐Based Copolymers for Polymer Light‐Emitting Diodes: Pure Near‐Infrared Emission via Optimized Energy and Charge Transfer
Publisher: Wiley
Date: 05-09-2016
Optimizing Polymer Solar Cells Using Non-Halogenated Solvent Blends
Publisher: MDPI AG
Date: 22-03-2019
Abstract: More environmentally friendly polymer solar cells were constructed using a conjugated polymer, poly (2,5-thiophene-alt-4,9-bis(2-hexyldecyl)-4,9-dihydrodithieno[3,2-c:3′,2′h][1,5] naphthyridine-5,10-dione, PTNT, as a donor material in combination with PC71BM as an acceptor in a bulk heterojunction device structure. A non-halogenated processing solvent (o-xylene) and solvent additives that are less harmful to the environment such as 1-methoxynaphthalene (MN) and 1-phenylnaphthalene (PN) were used throughout the study as processing solvents. The most widely used halogenated solvent additives (1,8-diiodooctane (DIO) and 1-chloronaphthalene (CN)) were also used for comparison and to understand the effect of the type of solvent additives on the photovoltaic performances. Atomic force microscopy (AFM) was employed to investigate the surface morphology of the films prepared in the presence of the various additives. The best-performing polymer solar cells provided a high open-circuit voltage of 0.9 V, an efficient fill factor of around 70%, and a highest power conversion efficiency (PCE) of over 6% with the use of the eco-friendlier o-xylene/MN solvent systems. Interestingly, the solvent blend which is less harmful and with low environmental impact gave a 20% rise in PCE as compared to an earlier reported device efficiency that was processed from the chlorinated solvent o-dichlorobenzene (o-DCB).
Efficient infiltration of low molecular weight polymer in nanoporous TiO2
Publisher: Elsevier BV
Date: 2011
Vertical phase separation in spin-coated films of a low bandgap polyfluorene/PCBM blend—Effects of specific substrate interaction
Publisher: Elsevier BV
Date: 02-2007
Alternating Copolymers and Alternative Device Geometries for Organic Photovoltaics
Publisher: Springer Science and Business Media LLC
Date: 03-2012
Stability study of quinoxaline and pyrido pyrazine based co-polymers for solar cell applications
Publisher: Elsevier BV
Date: 11-2014
Correlation between oxidation potential and open-circuit voltage of composite solar cells based on blends of polythiophenes/ fullerene derivative
Publisher: AIP Publishing
Date: 25-02-2004
DOI: 10.1063/1.1650878
Abstract: The photovoltaic parameters of donor/acceptor blend organic solar cells are highly influenced by several parameters, such as the strength of the acceptor species, the morphology of the film due to the solvent, and the mobility of the free charge carriers. In this work, the open-circuit voltage (Voc) of solar cells based on series of conjugated polythiophene polymers were measured and compared. In every cell, the donor polymer was blended with an electron acceptor fullerene molecule. The devices were constructed in a sandwich structure with indium tin oxide (ITO)/metallic polymer (PEDOT:PSS) acting as an anode and Al or LiF/Al acting as a cathode. Comparing the Voc of all the cells shows that this important photovoltaic parameter is systematically varying with the polymer. The variation of photovoltage is attributed to the variation of the oxidation potential of the donor conjugated polymers after due consideration of the different injection conditions in the varying polymers.
A novel polythiophene with pendant fullerenes: toward donor/acceptor double-cable polymers
Publisher: Royal Society of Chemistry (RSC)
Date: 2000
DOI: 10.1039/B008072L
Electroluminescence from Substituted Poly(thiophenes): From Blue to Near-Infrared
Publisher: American Chemical Society (ACS)
Date: 10-1995
DOI: 10.1021/MA00126A033
Structural Ordering in Phenyl-Substituted Polythiophenes
Publisher: American Chemical Society (ACS)
Date: 07-2000
DOI: 10.1021/MA9911389
Charge Carrier Dynamics of Polymer:Fullerene Blends: From Geminate to Non‐Geminate Recombination
Publisher: Wiley
Date: 08-02-2014
Quantification of Quantum Efficiency and Energy Losses in Low Bandgap Polymer:Fullerene Solar Cells with High Open‐Circuit Voltage
Publisher: Wiley
Date: 07-05-2012
Stability of Polymer Interlayer Modified ITO Electrodes for Organic Solar Cells
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/CH15806
Abstract: Indium-tin-oxide (ITO) electrode surfaces were modified using thin polymeric films of ethoxylated polyethylenimine (PEIE) and poly(3,3′-([(9′,9′-dioctyl-9H,9′H-[2,2′-bifluorene]-9,9-diyl)bis(4,1-phenylene)]bis(oxy))bis(N,N-dimethylpropan-1-amine)) (PFPA-1) to investigate the resultant work function and its stability in ambient atmosphere. Both PEIE and PFPA-1 were found to significantly reduce the ITO work function, as a result of a surface dipole at the ITO–polymer interface. After aging for two weeks in ambient air atmosphere, the N-side groups and OH groups in PEIE-modified ITO were found to realign themselves away from the polymer surface, resulting in an orientation more parallel to the surface normal and thus in an increase in work function from 3.5 to 3.8 eV. The work function of PFPA-1-modified ITO was found to increase from 3.65 to 4.1 eV after two weeks of aging in air due to a complete re-orientation of the polar side chains away from the surface, aligning the dipoles more parallel to the surface normal. In both PEIE and PFPA-1 s les, the hydrophobic aliphatic carbon was found to dominate the polymer surface, after aging.
Photodiodes and solar cells based on the n-type polymer poly(pyridopyrazine vinylene) as electron acceptor
Publisher: Elsevier BV
Date: 07-2003
Side chain modification on PDI-spirobifluorene-based molecular acceptors and its impact on organic solar cell performances
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NJ04810J
Abstract: N -Substitution in perylene diimide (PDI) n-type semiconductors is critical for their performance in organic bulk heterojunction solar cells.
Bulk heterojunction organic photovoltaics from water-processable nanomaterials and their facile fabrication approaches
Publisher: Elsevier BV
Date: 09-2016
DOI: 10.1016/J.CIS.2016.05.013
Abstract: Organic thin film photovoltaics based on bulk-heterojunction donor-acceptor combinations have received significant interest due to their potential for low-cost, large-scale solution processing. However, current state-of-the-art cells utilise materials soluble mainly in halogenated solvents which pose processing challenges due to their toxicity and thus environmental hazards. In this contribution, we look at various nanomaterials, and alternative processing of these solar cells using environmentally friendly solvents, and review recently reported different strategies and approaches that are making inroads in this field. Specifically, we focus on the use of water-dispersible donors and acceptors, use of aqueous solvents for fabrication and discuss the merits of the two main approaches of water-processable solar cells namely, through the use of water-soluble materials and the use of aqueous dispersion rather than a solution, as well as review some of the recent advances in alternative fabrication techniques.
Regioselective polymerization of 3-(4-octylphenyl)thiophene with FeCl3
Publisher: American Chemical Society (ACS)
Date: 10-1994
DOI: 10.1021/MA00100A039
Conformational transitions of a free amino-acid-functionalized polythiophene induced by different buffer systems
Publisher: IOP Publishing
Date: 11-10-2002
Charge separation dynamics in a narrow band gap polymer–PbS nanocrystal blend for efficient hybrid solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM34034H
Temperature-Dependent Optical Properties of Flexible Donor–Acceptor Polymers
Publisher: American Chemical Society (ACS)
Date: 18-03-2015
DOI: 10.1021/JP511246N
Recent advances in flow-based automated solid-phase extraction
Publisher: Elsevier BV
Date: 11-2018
Influence of Solvent Mixing on the Morphology and Performance of Solar Cells Based on Polyfluorene Copolymer/Fullerene Blends
Publisher: Wiley
Date: 20-03-2006
Influence of Polymerization Temperature on Molecular Weight, Photoluminescence, and Electroluminescence for a Phenyl-Substituted Poly(p-phenylenevinylene)
Publisher: American Chemical Society (ACS)
Date: 20-04-2001
DOI: 10.1021/MA001921X
An isoindigo-based low band gap polymer for efficient polymer solar cells with high photo-voltage
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1CC11053E
Abstract: A new low band gap polymer (E(g) = 1.6 eV) with alternating thiophene and isoindigo units was synthesized and characterized. A PCE of 3.0% and high open-circuit voltage of 0.89 V were realized in polymer solar cells, which demonstrated the promise of isoindigo as an electron deficient unit in the design of donor-acceptor conjugated polymers for polymer solar cells.
Structure–property relationships of oligothiophene–isoindigo polymers for efficient bulk-heterojunction solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3EE42989J
Synthesis and properties of new polythiophenes with high photoluminescence efficiency
Publisher: Elsevier BV
Date: 03-2001
Insights into the Oxidant/Polymer Interfacial Growth of Vapor Phase Polymerized PEDOT Thin Films
Publisher: Wiley
Date: 25-06-2018
Ultrafast photogeneration of inter-chain charge pairs in polythiophene films
Publisher: Elsevier BV
Date: 05-2000
Synthesis and Characterization of Polyfluorenes with Light-Emitting Segments
Publisher: American Chemical Society (ACS)
Date: 16-02-2001
DOI: 10.1021/MA001684Y
Photodiodes made from poly(pyridopyrazine vinylene):polythiophene blends
Publisher: Elsevier BV
Date: 03-2001
Design, Synthesis and Properties of Low Band Gap Polyfluorenes for Photovoltaic Devices
Publisher: Elsevier BV
Date: 09-2005
Laminated fabrication of polymeric photovoltaic diodes
Publisher: Springer Science and Business Media LLC
Date: 09-1998
DOI: 10.1038/26183
High‐Speed OLEDs and Area‐Emitting Light‐Emitting Transistors from a Tetracyclic Lactim Semiconducting Polymer
Publisher: Wiley
Date: 15-08-2018
Broad spectrum absorption and low-voltage electrochromic operation from indacenodithieno[3,2-b]thiophene-based copolymers
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8PY01787E
Abstract: The design and application of IDTT-based conjugated polymers for red-to-transparent and black-to-transparent electrochromic switching at low voltages are reported.
Soluble Polythiophenes with Pendant Fullerene Groups as Double Cable Materials for Photodiodes
Publisher: Wiley
Date: 12-2001
DOI: 10.1002/1521-4095(200112)13:24<1871::AID-ADMA1871>3.0.CO;2-3
High luminescence from a substituted polythiophene in a solvent with low solubility
Publisher: Elsevier BV
Date: 04-2001
Influence of buffer layers on the performance of polymer solar cells
Publisher: AIP Publishing
Date: 29-04-2004
DOI: 10.1063/1.1739279
Abstract: The influence of different anode buffer layers on the performance of solar cells based on blends of polyfluorene copolymer poly[2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (DiO-PFDTBT), acting as electron donor, and [6,6]-phenyl-C61-butyric acid methylester (PCBM), acting as electron acceptor was studied. The buffer layers were constructed from different forms of poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate)(PEDOT-PSS). Variations in open-circuit voltage, short-circuit current, and fill factor were observed. These were attributed to the slight rearrangement of the insulating layer PSS on top of PEDOT, which altered the charge injection at the interface between anode and photoactive layer.
Theoretical models and experimental results on the temperature dependence of polyfluorene solar cells
Publisher: Elsevier BV
Date: 07-2006
Small Band Gap Polymers Synthesized via a Modified Nitration of 4,7-Dibromo-2,1,3-benzothiadiazole
Publisher: American Chemical Society (ACS)
Date: 15-09-2010
DOI: 10.1021/OL1020724
Abstract: The nitration of 4,7-dibromo-2,1,3-benzothiadiazole was modified by using CF(3)SO(3)H and HNO(3) as the nitrating agent, and the related yield was improved greatly. On the basis of this improvement, two new small band gap polymers, P1TPQ and P3TPQ, were developed. Bulk heterojunction solar cells based on P3TPQ and [6,6]-phenyl-C(71)-butyric acid methyl ester exhibit interesting results with a power conversion efficiency of 2.1% and photoresponse up to 1.1 μm.
Ultrafast Terahertz Photoconductivity of Bulk Heterojunction Materials Reveals High Carrier Mobility up to Nanosecond Time Scale
Publisher: American Chemical Society (ACS)
Date: 13-07-2012
DOI: 10.1021/JA301757Y
Abstract: The few-picosecond (ps) decay of terahertz (THz) photoconductivity typically observed for conjugated polymer:fullerene blends (at excitation fluencies ~10(15) photons/cm(2) per pulse) is shown to be a result of charge pair annihilation for two polymer:PCBM blends. At a factor of 100 lower excitation density, the THz decay is in the hundreds of ps time scale, implying that very high carrier mobility (~0.1 cm(2) V(-1) s(-1)) prevails for long time after charge formation, of importance for free charge formation in organic solar cells.
Ultrafast excited state dynamics of a bithiophene‐isoindigo copolymer obtained by direct arylation polycondensation and its application in indium tin oxide‐free solar cells
Publisher: Wiley
Date: 08-10-2018
DOI: 10.1002/POLB.24743
Influence of side chains on electrochromic properties of green donor–acceptor–donor polymers
Publisher: Elsevier BV
Date: 04-2011
An alternating D–A1–D–A2 copolymer containing two electron-deficient moieties for efficient polymer solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA12321A
Diketopyrrolopyrrole-based polymer:fullerene nanoparticle films with thermally stable morphology for organic photovoltaic applications
Publisher: Springer Science and Business Media LLC
Date: 03-2017
DOI: 10.1557/MRC.2017.3
Light amplification in polymer field effect transistor structures
Publisher: AIP Publishing
Date: 19-08-2003
DOI: 10.1063/1.1597957
Abstract: The lified spontaneous emission (ASE) of optically pumped films of poly(2-(2′,5′-bis(octyloxy)benzene)-1,4-phenylenevinylene (BOP-PPV) was studied in structures comprising a gate electrode, a thin film of gate insulator material (SiO2) and the polymer film as luminescent semiconducting layer (i.e. a field effect transistor without the source and drain electrodes). The influences of different gate electrodes on the threshold and the wavelength of the lified emission were measured for variable thickness of the gate insulator. An exponential increase in ASE threshold (It) with decreasing separation between electrode and polymer layer was observed. In structures with 200 nm SiO2 gate insulator, It=300 kW/cm2 with an n-Si gate electrode and 200 kW/cm2 with Au electrode (100 nm thick). Compared to the same polymer film on pure SiO2 (It=2 kW/cm2), this increase results from waveguide losses in the nearby gate electrode. With an indium–tin–oxide (ITO) gate electrode (140 nm thick) on glass, again with a 200 nm SiO2 gate insulator, It=30 kW/cm2. The ITO electrode acts as a second waveguide, and the light is distributed into two modes. The observed wavelength shift and the increasing It with decreasing SiO2 thickness result from this mode structure. When the thickness of the ITO electrode is less than 60 nm, the mode traveling mainly in the ITO is cutoff, and a single waveguide structure is formed with an associated reduction in It. For an ITO thickness of 12 nm, It=4 kW/cm2, only two times bigger than that observed in a pure BOP-PPV film on fused silica.
Ultrafast studies of stimulated emission and gain in solid films of conjugated polymers
Publisher: Elsevier BV
Date: 02-1997
Recent Advances in n‐Type Polymers for All‐Polymer Solar Cells
Publisher: Wiley
Date: 21-02-2019
Abstract: All-polymer solar cells (all-PSCs) based on n- and p-type polymers have emerged as promising alternatives to fullerene-based solar cells due to their unique advantages such as good chemical and electronic adjustability, and better thermal and photochemical stabilities. Rapid advances have been made in the development of n-type polymers consisting of various electron acceptor units for all-PSCs. So far, more than 200 n-type polymer acceptors have been reported. In the last seven years, the power conversion efficiency (PCE) of all-PSCs rapidly increased and has now surpassed 10%, meaning they are approaching the performance of state-of-the-art solar cells using fullerene derivatives as acceptors. This review discusses the design criteria, synthesis, and structure-property relationships of n-type polymers that have been used in all-PSCs. Additionally, it highlights the recent progress toward photovoltaic performance enhancement of binary, ternary, and tandem all-PSCs. Finally, the challenges and prospects for further development of all-PSCs are briefly considered.
Interchain photoluminescence in substituted polyfluorenes
Publisher: Elsevier BV
Date: 03-2001
Low bandgap polymers synthesized by FeCl3 oxidative polymerization
Publisher: Elsevier BV
Date: 07-2010
Evaporation of gasoline-like and ethanol-based fuels in hollow-cone sprays investigated by planar laser-induced fluorescence and mie scattering
Publisher: SAE International
Date: 30-08-2011
DOI: 10.4271/2011-01-1889
Effects of side chain isomerism on the physical and photovoltaic properties of indacenodithieno[3,2-b]thiophene–quinoxaline copolymers: toward a side chain design for enhanced photovoltaic perf
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA04102J
Abstract: Polymers based on quinoxaline and indacenodithieno[3,2- b ]thiophene (IDTT) with meta -hexyl-phenyl side chains were synthesized.
Electropolymerization and spectroscopic properties of a novel double-cable polythiophene with pendant fullerenes for photovoltaic applications
Publisher: Elsevier BV
Date: 03-2001
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