ORCID Profile
0000-0003-1088-7744
Current Organisation
University of Melbourne
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Physical Chemistry of Materials | Functional Materials | Nanotechnology | Molecular and Organic Electronics | Macromolecular and Materials Chemistry not elsewhere classified | Materials Engineering | Nanofabrication, Growth and Self Assembly
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Publisher: Elsevier BV
Date: 09-1989
Publisher: Wiley
Date: 14-09-2018
Publisher: American Chemical Society (ACS)
Date: 02-05-2016
Publisher: Wiley
Date: 14-04-2023
Abstract: Efficient surface passivation of perovskite solar cells (PSC) using treatment with ammonium salts is demonstrated as an efficient method to enhance the device performance, owing to the affinity between the amine group and [PbI 6 ] 4− octahedron. However, due to their high solubility in polar solvents (DMF/DMSO), ammonium salts are more difficult to use in passivation of the interface between the electron transport layer and perovskite thin film in n‐i‐p structured PSCs. In this report, this work successfully links the amine group with a fullerene through a series of increasing carbon chain length, from two to twelve methylene units (FC‐X, X = 2, 6, 12), and then introduce the synthesized molecules as interface passivation layers into SnO 2 ‐based planar n‐i‐p PSCs. Results show that the interface passivation effect is highly dependent on the side‐chain length, and the longer chain length amine‐functionalized fullerene is more beneficial for the device performance. A power conversion efficiency as high as 21.2% is achieved by using FC‐12. The surface energy, perovskite crystallite size and electron transfer capacity correlate with the linker chain length. This work develops an amine‐induced anchored crystallization of perovskite to unravel the mechanism of this passivation effect. As expected, enhanced device stability is also observed in the FC‐12 passivated PSCs.
Publisher: Wiley
Date: 23-08-2016
Publisher: American Chemical Society (ACS)
Date: 24-03-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CC33892K
Abstract: The oxidative cyclodehydrogenation of electron-poor arenes was achieved using DDQ-CF(3)SO(3)H resulting in hexa-peri-hexabenzocoronenes with electron withdrawing Br, F and CF(3) groups. This method will lead to their expansion into a new class of electron transport materials.
Publisher: Elsevier BV
Date: 2015
Publisher: SPIE
Date: 06-10-2014
DOI: 10.1117/12.2076224
Publisher: Royal Society of Chemistry (RSC)
Date: 2006
DOI: 10.1039/B513180D
Abstract: We demonstrate the formation of a charge transfer cascade at a nanostructured TiO2/dye olymer/molecular hole transport multilayer interface. Charge recombination dynamics at this interface are shown to be retarded when the ionisation potential of the polymer layer exceeds that of the molecular hole transport layer.
Publisher: American Chemical Society (ACS)
Date: 26-04-2011
DOI: 10.1021/JO2001484
Abstract: A one-pot synthesis of 2,6-dibromodithieno[3,2-b ',3'-d]thiophene (dibromo-DTT, 4) was developed. A key step was bromodecarboxylation of DTT-2,6-dicarboxylic acid, obtained by saponification of the diester 1. The donor-acceptor dye DAHTDTT (13), based on a central 2,6-bis[2'-(3'-hexylthienyl)]dithieno[3,2-b ',3'-d]thiophene core (9), was prepared and incorporated in a dye-sensitized solar cell (DSC), which exhibited an energy conversion efficiency of 7.3% with V(oc) of 697 mV, J(sc) of 14.4 mA/cm(2), and ff of 0.73 at 1 sun.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA00168A
Abstract: Through depth-dependent GIWAXS studies, the solubility of molecular organic semiconductors was found to correlate with π-stacking orientation and photovoltaic performance.
Publisher: Wiley
Date: 27-11-2015
Abstract: A high molecular weight donor-acceptor conjugated polymer is synthesized using the Suzuki polycondensation method. Using this polymer, a single-junction bulk-heterojunction solar cell is fabricated giving a power conversion efficiency of 9.4% using a fullerene-modified ZnO interlayer at the cathode contact.
Publisher: American Chemical Society (ACS)
Date: 05-12-2014
DOI: 10.1021/JP510769P
Abstract: The photophysics of a conjugated triblock copolymer comprising poly(9,9-dioctylfluorene-co-bis-N,N'-(4-methylphenyl)-bis-N,N'-phenyl-1,4-phenylenediamine) (PFM) electron donor and poly(4-(9,9-dioctyl-9H-fluoren-2-yl)benzo[c][1,2,5]-thiadiazole) (F8BT) electron acceptor blocks has been studied in solution, in films, and as single chains. While an additional long-wavelength emission apparent in neat films of the copolymer is attributed to interchain exciplex formation, no such long-wavelength emission is apparent in solution or from single molecules. However, in these cases, time-resolved fluorescence measurements indicate the presence of a delayed fluorescence. The kinetics of the delayed emission can be interpreted in terms of an equilibrium between a locally excited and a charge-transfer state at the interface of the copolymer block components. Rate constants and thermodynamic quantities associated with these processes have been evaluated. The single-molecule results allow the assignment of an intramolecular charge-transfer state in an isolated conjugated block copolymer chain.
Publisher: Wiley
Date: 04-08-2021
Abstract: Tunable crystal growth offering highly aligned perovskite crystallites with suppressed deep‐level defects is vital for efficient charge transport, which in turn significantly influences the power conversion efficiency (PCE) of perovskite solar cells (PSCs). Herein, a “precursor to perovskite‐like template to perovskite” (PPP) growth strategy is developed, using either MAAc or GuaCl precursor to induce a sacrificial thermal–unstable perovskite‐like template for (FAPbI 3 ) x (MAPbI 3 ) y perovskite growth. The self‐sacrificed intermediate template induces the formation of highly aligned perovskite crystals with greatly enhanced film crystallinity and suppresses deep‐level defect formation. Furthermore, it is proved that MAAc or GuaCl completely evaporates during the high‐temperature annealing process. The reduction in defect densities and nonradiative recombination enhances both carrier lifetime and charge dynamics, yielding impressive PCEs of 22.3% and 22.8% with a high open‐circuit voltage ( V OC ) of 1.16 V and an incredible fill factor (FF) of 81.5% and 79.4% for MAAc‐ and GuaCl‐based devices, respectively. These results suggest that the formation of the thermal–unstable perovskite‐like sacrificial template is a promising strategy to restrain the deep‐level defects in perovskite films toward the attainment of highly efficient and stable large‐scale PSCs as well as other perovskite‐based electronics.
Publisher: Springer Science and Business Media LLC
Date: 19-10-2016
DOI: 10.1038/PJ.2016.97
Publisher: Elsevier BV
Date: 10-2016
Publisher: American Chemical Society (ACS)
Date: 08-12-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA01125B
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5OB01630D
Abstract: A class of fullerene bisadducts was synthesized in one-pot over two steps with regioselectivity using tether-directed functionalization approach. In extending this class of materials, interesting variations in regioselectivity was observed when different amino acid reactants were used.
Publisher: Wiley
Date: 15-12-2017
Publisher: Beilstein Institut
Date: 25-07-2013
DOI: 10.3762/BJOC.9.170
Abstract: There is an increasing demand for organic semiconducting materials with the emergence of organic electronic devices. In particular, large-area devices such as organic thin-film photovoltaics will require significant quantities of materials for device optimization, lifetime testing and commercialization. Sourcing large quantities of materials required for the optimization of large area devices is costly and often impossible to achieve. Continuous-flow synthesis enables straight-forward scale-up of materials compared to conventional batch reactions. In this study, poly(3-hexylthiophene), P3HT, was synthesized in a bench-top continuous-flow reactor. Precise control of the molecular weight was demonstrated for the first time in flow for conjugated polymers by accurate addition of catalyst to the monomer solution. The P3HT s les synthesized in flow showed comparable performance to commercial P3HT s les in bulk heterojunction solar cell devices.
Publisher: Royal Society of Chemistry (RSC)
Date: 1998
DOI: 10.1039/A707422K
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7QM00598A
Abstract: Two dyes showing aggregation induced emission behaviour were examined for use as a light harvesting Förster resonance energy transfer pair in luminescent solar concentrators.
Publisher: American Chemical Society (ACS)
Date: 29-03-2019
Publisher: Elsevier BV
Date: 1999
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0JM00311E
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4PY00827H
Abstract: A new thienothiophene–benzodithiophene electron donor building block was synthesized and incorporated into 2-dimensional conjugated donor–acceptor polymers. The polymers were fully characterised and tested in bulk heterojunction solar cell devices.
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 05-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TC05280A
Abstract: Structure–property studies of p-type oligothiophene-based materials linking sidechain substituents, photovoltaic performance and thin-film morphology leading to key design guidelines.
Publisher: Wiley
Date: 20-01-2020
Publisher: Elsevier BV
Date: 04-2010
Publisher: Elsevier BV
Date: 03-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TC31622J
Publisher: Springer Science and Business Media LLC
Date: 30-09-2015
DOI: 10.1038/SREP14645
Abstract: This study investigates novel deposition techniques for the preparation of TiO 2 electrodes for use in flexible dye-sensitized solar cells. These proposed new methods, namely pre-dye-coating and codeposition ultrasonic spraying, eliminate the conventional need for time-consuming processes such as dye soaking and high-temperature sintering. Power conversion efficiencies of over 4.0% were achieved with electrodes prepared on flexible polymer substrates using this new deposition technology and N719 dye as a sensitizer.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3PY01142A
Publisher: American Chemical Society (ACS)
Date: 19-12-2017
DOI: 10.1021/ACS.ACCOUNTS.6B00432
Abstract: Luminescent solar concentrators (LSCs) are light harvesting devices that are ideally suited to light collection in the urban environment where direct sunlight is often not available. LSCs consist of highly luminescent compounds embedded or coated on a transparent substrate that absorb diffuse or direct solar radiation over a large area. The resulting luminescence is trapped in the waveguide by total internal reflection to the thin edges of the substrate where the concentrated light can be used to improve the performance of photovoltaic devices. The concept of LSCs has been around for several decades, and yet the efficiencies of current devices are still below expectations for commercial viability. There are two primary challenges when designing new chromophores for LSC applications. Reabsorption of dye emission by chromophores within the waveguide is a significant loss mechanism attenuating the light output of LSCs. Concentration quenching, particularly in organic dye systems, restricts the quantity of chromophores that can be incorporated in the waveguide thus limiting the light absorbed by the LSC. Frequently, a compromise between increased light harvesting of the incident light and decreasing emission quantum yield is required for most organic chromophore-based systems due to concentration quenching. The low Stokes shift of common organic dyes used in current LSCs also imposes another optimization problem. Increasing light absorption of LSCs based on organic dyes to achieve efficient light harvesting also enhances reabsorption. Ideally, a design strategy to simultaneously optimize light harvesting, concentration quenching, and reabsorption of LSC chromophores is clearly needed to address the significant losses in LSCs. Over the past few years, research in our group has targeted novel dye structures that address these primary challenges. There is a common perception that dye aggregates are to be avoided in LSCs. It became apparent in our studies that aggregates of chromophores exhibiting aggregation-induced emission (AIE) behavior are attractive candidates for LSC applications. Strategic application of AIE chromophores has led to the development of the first organic-based transparent solar concentrator that harvests UV light as well as the demonstration of reabsorption reduction by taking advantage of energy migration processes between chromophores. Further developments led us to the application of perylene diimides using an energy migration/energy transfer approach. To prevent concentration quenching, a molecularly insulated perylene diimide with bulky substituents attached to the imide positions was designed and synthesized. By combining the insulated perylene diimide with a commercial perylene dye as an energy donor-acceptor emitter pair, detrimental luminescence reabsorption was reduced while achieving a high chromophore concentration for efficient light absorption. This Account reviews and reinspects some of our recent work and the improvements in the field of LSCs.
Publisher: Wiley
Date: 22-03-2010
Publisher: Wiley
Date: 23-08-2022
Abstract: In organic solar cells, the resulting device efficiency depends strongly on the local morphology and intermolecular interactions of the blend film. Optical spectroscopy was used to identify the spectral signatures of interacting chromophores in blend films of the donor polymer PM6 with two state‐of‐the‐art nonfullerene acceptors, Y6 and N4, which differ merely in the branching point of the side chain. From temperature‐dependent absorption and luminescence spectroscopy in solution, it is inferred that both acceptor materials form two types of aggregates that differ in their interaction energy. Y6 forms an aggregate with a predominant J‐type character in solution, while for N4 molecules the interaction is predominantly in a H‐like manner in solution and freshly spin‐cast film, yet the molecules reorient with respect to each other with time or thermal annealing to adopt a more J‐type interaction. The different aggregation behavior of the acceptor materials is also reflected in the blend films and accounts for the different solar cell efficiencies reported with the two blends.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC02108C
Abstract: S les containing both molecularly insulated and aggregated perylene diimides at high concentration (140 mM) in polymer matrix showed very high photoluminescence quantum yield (85%) as a result of efficient energy transfer.
Publisher: Royal Society of Chemistry (RSC)
Date: 2004
DOI: 10.1039/B409870F
Abstract: Group 4 metal complexes containing phenoxy-amide ligands bearing soft pendant donors are shown to give more highly active ethylene polymerisation catalysts than counterparts containing hard donors or systems without a pendant donor.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CC02701B
Abstract: Efficient synthesis of a single isomer of a fullerene bisadduct for organic solar cell applications was obtained using tether-directed functionalization in one pot over two steps.
Publisher: American Chemical Society (ACS)
Date: 31-03-2011
DOI: 10.1021/JO2001879
Abstract: Various fullerene-based electron acceptor materials for organic photovoltaic applications were prepared via [3+2] and [4+2] cycloadditions using a continuous flow approach. The 1,3-dipolar cycloaddition of the tosylhydrazone precursor and the Diels-Alder cycloaddition of indene to either C(60) or C(70) under conventional batch reaction conditions were translated to the continuous flow process. By varying the residence time, temperature, and equivalents of cycloaddition reagent, significant improvements in yields and reaction times were achieved over conventional batch processes.
Publisher: Springer Science and Business Media LLC
Date: 16-07-2014
DOI: 10.1038/SREP05701
Publisher: The Japan Institute of Heterocyclic Chemistry
Date: 2006
DOI: 10.3987/COM-06-10690
Publisher: American Chemical Society (ACS)
Date: 04-10-2010
DOI: 10.1021/OL102166M
Abstract: A new class of self-assembling hexa-peri-hexbenzocoronene (HBC)-fullerene hybrid materials has been synthesized and characterized. Photoluminescence experiments indicate that energy transfer processes can be tuned in these donor-acceptor systems by varying the length and nature of the linker group. In preliminary device testing, ambipolar charge transport behavior is observed in organic field effect transistors, while single active component organic photovoltaic devices consisting of these materials achieved a maximum external quantum efficiency of 30%.
Publisher: Royal Society of Chemistry (RSC)
Date: 1999
DOI: 10.1039/A900509I
Publisher: American Chemical Society (ACS)
Date: 21-12-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3MA00106G
Abstract: A volatile solid additive (tris(pentafluorophenyl)phosphine) is used to modulate the nanoscale phase-separated morphology of a photoactive layer to fabricate an efficient organic photovoltaic device with a power conversion efficiency of 16.9%.
Publisher: Wiley
Date: 03-09-2016
Publisher: American Chemical Society (ACS)
Date: 23-12-2010
DOI: 10.1021/CM903272Y
Publisher: Wiley
Date: 12-04-2011
Abstract: Apart from molecular properties, intermolecular forces play a vital role in defining the performance of organic electronic devices. This is particularly relevant in bulk heterojunction (BHJ) solar cells in which the arrangement of electron-donor and -acceptor materials into distinct crystalline phases of ideal size and distribution can lead to better power conversion efficiencies. In this study, a series of fluorenyl hexa-peri-hexabenzocoronenes (FHBC) decorated with thiophene dendrons (DOT) of variable size was obtained by using a convergent synthetic approach. With such variety of molecular sizes and shapes in hand, the objective of this study is to highlight the relationships between molecular properties, bulk properties and device performance. Correlations between π-π stacking ability and dendrimer generation were established from self-organisation studies in solution and solid state. The synergistic combination of molecular organisation at the nanoscale and photophysical characteristics derived from the FHBC and DOT moieties leads to a notable improvement of the photovoltaic performance.
Publisher: Elsevier BV
Date: 09-2022
Publisher: Springer Science and Business Media LLC
Date: 14-01-2015
DOI: 10.1038/NCOMMS7013
Abstract: Solution-processed organic photovoltaic cells (OPVs) hold great promise to enable roll-to-roll printing of environmentally friendly, mechanically flexible and cost-effective photovoltaic devices. Nevertheless, many high-performing systems show best power conversion efficiencies (PCEs) with a thin active layer (thickness is ~100 nm) that is difficult to translate to roll-to-roll processing with high reproducibility. Here we report a new molecular donor, benzodithiophene terthiophene rhodanine (BTR), which exhibits good processability, nematic liquid crystalline behaviour and excellent optoelectronic properties. A maximum PCE of 9.3% is achieved under AM 1.5G solar irradiation, with fill factor reaching 77%, rarely achieved in solution-processed OPVs. Particularly promising is the fact that BTR-based devices with active layer thicknesses up to 400 nm can still afford high fill factor of ~70% and high PCE of ~8%. Together, the results suggest, with better device architectures for longer device lifetime, BTR is an ideal candidate for mass production of OPVs.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA05056E
Abstract: In-situ X-ray scattering studies of solvent vapor annealing of the active layer in benzodithiophene terthiophene rhodanine (BTR) solar cells reveals the mechanisms for morphology transformation and device improvement.
Publisher: American Chemical Society (ACS)
Date: 23-07-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM35221D
Publisher: Walter de Gruyter GmbH
Date: 13-03-2012
Abstract: Polycyclic aromatic hydrocarbons (PAHs) are in a class of functional organic compounds with increasing importance in organic electronics. Their tunable photophysical properties and typically strong intermolecular associations make them ideal materials in applications where control of charge mobility is essential. Hexa- peri -hexabenzocoronene (HBC) is a disc-shaped PAH that self-associates into columnar stacks through strong π–π interactions. By decorating the periphery of the HBC molecule with various substituents, a range of properties and functions can be obtained including solution processability, liquid crystallinity, and semiconductivity. In this review article, the synthesis, properties, and functions of HBC derivatives are presented with focus on work published in the last five years.
Publisher: Wiley
Date: 07-01-2015
Abstract: Fully printed perovskite solar cells are demonstrated with slot-die coating, a scalable printing method. A sequential slot-die coating process is developed to produce efficient perovskite solar cells and to be used in a large-scale roll-to-roll printing process. All layers excluding the electrodes are printed and devices demonstrate up to 11.96% power conversion efficiency. It is also demonstrated that the new process can be used in roll-to-roll production.
Publisher: American Chemical Society (ACS)
Date: 21-05-2014
DOI: 10.1021/AM5015666
Abstract: The morphology of the active layer in organic photovoltaics (OPVs) is of crucial importance as it greatly influences charge generation and transport. A templating interlayer between the electrode and the active layer can change active layer morphology and influence the domain orientation. A series of hiphilic interface modifiers (IMs) combining a hydrophilic polyethylene-glycol (PEG) oligomer and a hydrophobic hexabenzocoronene (HBC) were designed to be soluble in PEDOT:PSS solutions, and surface accumulate on drying. These IMs are able to self-assemble in solution. When IMs are deposited on top of a poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) film, they induce a morphology change of the active layer consisting of discotic fluorenyl-substituted HBC (FHBC) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM). However, when only small amounts (0.2 wt %) of IMs are blended into PEDOT:PSS, a profound change of the active layer morphology is also observed. Morphology changes were monitored by grazing incidence wide-angle X-ray scattering (GIWAXS), transmission electron microscopy (TEM), TEM tomography, and low-energy high-angle angular dark-field scanning transmission electron microscopy (HAADF STEM). The interface modification resulted in a 20% enhancement of power conversion efficiency.
Publisher: Wiley
Date: 09-07-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1CC14315H
Abstract: A selection of conjugated polymers, widely studied in organic electronics, was synthesised using continuous flow methodology. As a result of superior heat transfer and reagent control, excellent polymer molecular mass distributions were achieved in significantly reduced reaction times compared to conventional batch reactions.
Publisher: Wiley
Date: 25-09-2013
DOI: 10.1002/POLB.23386
Publisher: Wiley
Date: 18-06-2008
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7PY01878A
Abstract: Donor/acceptor block copolymers for organic photovoltaic active layers are discussed from first principles through the modern state-of-the-art and future perspectives.
Publisher: American Chemical Society (ACS)
Date: 15-10-2008
DOI: 10.1021/OM800652W
Publisher: American Chemical Society (ACS)
Date: 16-07-2005
DOI: 10.1021/JA0518171
Abstract: High throughput screening (HTS) of a 205 member Schiff base salicylaldimine ligand library derived from salicylaldehydes bearing bulky ortho-substituents, i.e., 9-anthracenyl, 1,4,5,8-tetramethylanthracenyl or triptycenyl, reacted in-situ with (p-tolyl)CrCl2(thf)3, identified two new classes of highly active chromium based systems for the oligomerization and polymerization of ethylene, respectively. The polymerization system comprises bidentate ortho-substituted anthracenyl Schiff bases bearing small primary or secondary alkyl imine substituents. The oligomerization catalysts are based upon tridentate ortho-triptycenyl-substituted Schiff bases with pyridylmethyl or quinolyl substituents. Validation tests confirmed polymerization productivities of up to 3000 g x mmol(-1)h(-1)bar(-1) for the polymerization catalyst systems while the oligomerization catalysts gave productivities up to 10 000 g x mmol(-1)h(-1)bar(-1). Key catalyst precursors have been characterized by X-ray crystallography.
Publisher: Wiley
Date: 03-03-2017
Abstract: Synthesis of fluorene-based conjugated polyelectrolytes was achieved via Suzuki polycondensation in water and completely open to air. The polyelectrolytes were conveniently purified by dialysis and analysis of the materials showed properties expected for fluorene-based conjugated polyelectrolytes. The materials were then employed in solar cell devices as an interlayer in conjunction with ZnO. The double interlayer led to enhanced power conversion efficiency of 10.75 % and 15.1 % for polymer and perovskite solar cells, respectively.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TC00951E
Abstract: Annealing is shown to increase both exciton diffusion and domain size in two organic photovoltaic materials. This enables both efficient light harvesting and efficient charge extraction.
Publisher: Elsevier BV
Date: 11-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 16-04-2002
DOI: 10.1039/B202037H
Abstract: Following a discovery that salicylaldimines bearing bulky ortho-phenoxy substituents and small imine substituents give very active chromium catalysts for ethylene polymerisation, High Throughput Screening (HTS) methodology has been employed to facilitate a further discovery of exceptionally active catalysts based on tridentate salicylaldimine ligands with bulky triptycenyl groups.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NJ06496B
Abstract: A novel compound NAI-PVP-NAI was utilized as a blue emissive layer for organic light emitting diodes and as an acceptor and a donor for organic solar cells.
Publisher: Elsevier BV
Date: 02-2013
Publisher: American Chemical Society (ACS)
Date: 05-05-2020
Publisher: American Chemical Society (ACS)
Date: 30-12-2020
Publisher: CSIRO Publishing
Date: 2013
DOI: 10.1071/CH12406
Abstract: The continuous flow synthesis of functional thiophene derivatives was examined. Methodology for the lithiation of thiophene building blocks was developed using a commercial bench-top flow reactor. In addition, the advantages of flow processing were demonstrated in the synthesis of a high performance organic dye in gram scale.
Publisher: American Chemical Society (ACS)
Date: 08-07-2019
Publisher: American Chemical Society (ACS)
Date: 13-02-2014
DOI: 10.1021/CM404054Z
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4PY01631A
Abstract: The effect of molecular weight of a conjugated polymer on its photophysical properties and solar cell device performance was investigated.
Publisher: Beilstein Institut
Date: 06-05-2016
DOI: 10.3762/BJOC.12.88
Abstract: Following an initial work on the isolation of a single geometric isomer from an indene–C 70 bisadduct (IC 70 BA) mixture, we report the full fractionation and identification of the bisadduct species in the material. Eleven fractions of IC 70 BA isomers were separated by high-performance liquid chromatography. A number of fractions contained relatively pure isomer species and their configuration were deduced using a variety of analytical techniques including 1 H and 13 C NMR and UV–vis spectroscopy. The electrochemical properties and the organic solar cell device performance were investigated for fractions where a reasonable quantity of s le could be isolated.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM34394K
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA01989H
Abstract: We combine thermodynamic modeling of molecular interactions in OPV blends with in situ measurements of morphology to link performance, structure and processing.
Publisher: Wiley
Date: 16-03-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3RA00365E
Abstract: The LARP (ligand-assisted re-precipitation) approach to synthesizing highly efficient Bi-based perovskites (CsBi 3 I 10 ) gives a photocurrent conversion efficiency (PCE) of 2.3% using the device architecture of ITO/NiO x erovskite layer/PC 61 BM/BCP/Ag.
Publisher: Elsevier BV
Date: 11-1996
Publisher: American Chemical Society (ACS)
Date: 10-01-2020
DOI: 10.1021/JACS.9B12526
Abstract: Organic photovoltaic (OPV) efficiencies continue to rise, raising their prospects for solar energy conversion. However, researchers have long considered how to suppress the loss of free carriers by recombination-poor diffusion and significant Coulombic attraction can cause electrons and holes to encounter each other at interfaces close to where they were photogenerated. Using femtosecond transient spectroscopies, we report the nanosecond grow-in of a large transient Stark effect, caused by nanoscale electric fields of ∼487 kV/cm between photogenerated free carriers in the device active layer. We find that particular morphologies of the active layer lead to an energetic cascade for charge carriers, suppressing pathways to recombination, which is ∼2000 times less than predicted by Langevin theory. This in turn leads to the buildup of electric charge in donor and acceptor domains-away from the interface-resistant to bimolecular recombination. Interestingly, this signal is only experimentally obvious in thick films due to the different scaling of electroabsorption and photoinduced absorption signals in transient absorption spectroscopy. Rather than inhibiting device performance, we show that devices up to 600 nm thick maintain efficiencies of >8% because domains can afford much higher carrier densities. These observations suggest that with particular nanoscale morphologies the bulk heterojunction can go beyond its established role in charge photogeneration and can act as a capacitor, where adjacent free charges are held away from the interface and can be protected from bimolecular recombination.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4SC01240B
Abstract: The formation of cross-linked polymer films, with tunable thickness, proceeds directionally from the substrate surface by controlled polymerization in the solid state.
Publisher: American Chemical Society (ACS)
Date: 05-11-2013
DOI: 10.1021/AM4044085
Abstract: In this study, the nanomorphology of fluorenyl hexa-peri-hexabenzocoronene:[6,6]-phenyl C61-butyric acid methyl ester (FHBC:PC61BM) absorber layers of organic solar cells was investigated. Different electron microscopical techniques, atomic force microscopy, and grazing incidence wide-angle X-ray scattering were applied for a comprehensive nanomorphology analysis. The development of the nanomorphology upon s le annealing and the associated change of the device performance were investigated. It was shown that the annealing process enhances the phase separation and therefore the bulk heterojunction structure. Due to π-π stacking, the FHBC molecules assemble into columnar stacks, which are already present before annealing. While the nonannealed s le consists of a mixture of homogeneously distributed PC61BM molecules and FHBC stacks with a preferential in-plane stack orientation, crystalline FHBC precipitates occur in the annealed s les. These crystals, which consist of hexagonal arranged FHBC stacks, grow with increased annealing time. They are distributed homogeneously over the whole volume of the absorber layer as revealed by electron tomography. The FHBC stacks, whether in the two phase mixture or in the pure crystalline precipitates, exhibit an edge-on orientation, according to results from grazing incidence wide-angle X-ray scattering (GIWAXS), dark-field transmission electron microscopy (DF TEM) imaging and selective area electron diffraction (SAED). The best solar cell efficiencies were obtained after 20 or 40 s s le annealing. These annealing times induce an optimized degree of phase separation between donor and acceptor material.
Publisher: Wiley
Date: 14-07-2015
Abstract: This account describes the work of our group in the area of organic photovoltaics in the past six years. The emphasis is on our experiences in the development of the organic materials, their characterization, scale-up and application in devices. We share our insight into the relationship between synthetic methods, molecular properties, bulk material properties and device performance.
Start Date: 2013
End Date: 2020
Funder: Australian Renewable Energy Agency
View Funded ActivityStart Date: 2020
End Date: 2022
Funder: Australian Renewable Energy Agency
View Funded ActivityStart Date: 10-2010
End Date: 12-2010
Amount: $100,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2017
End Date: 03-2020
Amount: $388,000.00
Funder: Australian Research Council
View Funded Activity