ORCID Profile
0000-0003-0690-939X
Current Organisation
University of Queensland
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Publisher: SPIE
Date: 27-11-2012
DOI: 10.1117/12.999270
Publisher: American Chemical Society (ACS)
Date: 20-11-2015
Publisher: American Chemical Society (ACS)
Date: 06-2018
Abstract: Engineering the interface between the perovskite absorber and the charge-transporting layers has become an important method for improving the charge extraction and open-circuit voltage ( V
Publisher: Elsevier BV
Date: 04-2007
Publisher: AIP Publishing
Date: 10-2007
DOI: 10.1063/1.2779257
Abstract: Using the time-of-flight technique (TOF), the influence of C60 concentrations on ambipolar charge transport in poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV)∕C60 composite has been investigated. Adding C60 to the blend increases both electron and hole mobilities, compared to the pristine polymer. In the pristine MEH-PPV, the mobility of electrons is below the measurable range. However, electron mobility (10−7 cm2 V−1 s−1) could be calculated when the weight ratio of C60: MEH-PPV increased to 1:18. The temperature and electric field dependence of mobility is analyzed in the disorder formalism. It is observed that above ∼290 K the slope of the electric field dependence of the electron mobility becomes negative. The occurrence of negative field dependence in composite s les is attributed to the large positional disorder (Σ=4).
Publisher: Elsevier BV
Date: 02-2009
Publisher: Elsevier BV
Date: 10-2010
Publisher: Elsevier BV
Date: 11-2014
Publisher: Wiley
Date: 07-2015
Publisher: American Chemical Society (ACS)
Date: 06-06-2016
Publisher: Wiley
Date: 11-11-2021
Abstract: Red‐emitting organic light‐emitting diodes (OLEDs) are important for displays and lighting, with the latter benefiting from solution processable materials, which would enable low embedded energy, scalable fabrication. Herein, the effect of annealing and phase separation on the performance of solution‐processed OLEDs incorporating a light‐emitting layer composed of the exciplex host, m‐MTDATA:OXD‐7, and a red phosphorescent light‐emitting dendrimer, Ir(tD C pq) 3 , is described. Solution‐processed OLEDs containing an annealed emissive layer with a low dendrimer concentration (2 wt%) are found to have the best performance, which is higher than the device in which the light‐emitting layer is not annealed. The improvement in the performance of the annealed device is ascribed to improved charge mobility within the emissive layer caused by phase separation of the OXD‐7. The OLEDs containing annealed m‐MTDATA:OXD‐7:(2 wt%) Ir(tD C pq) 3 have maximum current, power, and external quantum efficiencies of 17.9 cd A −1 , 19.4 lm W −1 , and 14.8 ± 0.6%, respectively. The fact that the maximum external quantum efficiency (EQE) of 14.8% is larger than that expected based on the photoluminescence quantum yield (PLQY) and the normal out‐coupling efficiency of 20% from a bottom‐emitting device is determined to arise from the different pathways of exciton formation under photoexcitation and charge injection.
Publisher: Elsevier BV
Date: 02-2007
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 11-2006
Publisher: AIP Publishing
Date: 15-10-2008
DOI: 10.1063/1.3003082
Abstract: We present the photovoltaic measurements of planar photovoltaic cells with extremely large interelectrode spacing based on either pure polymers or polymer∕fullerene blends. The planar configuration allows for both uniform and site-selective illuminations. As expected, cells with identical electrodes do not exhibit any photovoltaic action under uniform illumination. On the other hand, open-circuit voltage (VOC) greater than 1V has been observed in pure polymer cells with dissimilar gold∕calcium electrodes, which decreases when calcium is replaced with aluminum or when a fullerene derivative is added. In addition, all asymmetric cells exhibit photovoltaic action when the illumination is only applied to the anode half, the cathode, or the middle section of the cell. Our results provide unambiguous support to the metal∕insulator∕metal interpretation of polymer photovoltaic response.
Publisher: Wiley
Date: 29-09-2014
Publisher: IOP Publishing
Date: 31-03-2003
Publisher: Wiley
Date: 07-11-2017
Publisher: Elsevier BV
Date: 12-2006
Publisher: Elsevier BV
Date: 08-2006
Publisher: Elsevier BV
Date: 2008
Publisher: Elsevier BV
Date: 08-2007
Publisher: Elsevier BV
Date: 2007
Publisher: American Chemical Society (ACS)
Date: 02-01-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6NR06942H
Abstract: The large surface roughness, low work function and high cost of transparent electrodes using multilayer graphene films can limit their application in organic photovoltaic (OPV) cells. Here, we develop single layer graphene (SLG) films as transparent anodes for OPV cells that contain light-absorbing layers comprised of the evaporable molecular organic semiconductor materials, zinc phthalocyanine (ZnPc)/fullerene (C60), as well as a molybdenum oxide (MoO
Publisher: Elsevier BV
Date: 07-2006
Publisher: Wiley
Date: 23-07-2012
Publisher: Elsevier BV
Date: 04-2018
Publisher: Springer Science and Business Media LLC
Date: 2006
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3TC02740F
Publisher: Elsevier BV
Date: 11-2017
Publisher: IOP Publishing
Date: 30-03-2006
Publisher: American Chemical Society (ACS)
Date: 21-08-2009
DOI: 10.1021/JP906277K
Publisher: Wiley
Date: 11-08-2022
Abstract: Bulk heterojunction organic solar cells continue to show steady photoconversion efficiency improvements. However, single component organic solar cells are a particularly attractive alternative due to the relative simplicity of device manufacture. It has been proposed that organic semiconductors with a high dielectric constant (≈10) could give rise to spontaneous free charge carrier generation upon photoexcitation. In this manuscript, factors are explored that affect the dielectric constant of organic semiconductors, particularly the optical‐frequency dielectric constant. The properties of monomers, dimers and trimers of two isoelectronic families of materials that have acceptor units composed of one or two dicyanovinylbenzothiadiazole moieties and one to three donor units are compared. The donor components are composed of either fluorenyl or cyclopentadithiophene moieties with the same glycol‐based solubilizing groups. It is found that chromophore planarity and orientation with respect to the substrate, and film density affect the optical and electronic properties of the materials, especially the high‐frequency dielectric constant. The results also indicate that delocalization of the highest occupied and lowest unoccupied molecular orbitals is a critical factor. The dimer with two dicyanovinylbenzothiadiazole moieties and two dithienocyclopentadiene units is found to have the highest optical frequency dielectric constant and overall performance.
Publisher: IOP Publishing
Date: 23-08-2007
Publisher: Elsevier BV
Date: 09-2008
Publisher: American Chemical Society (ACS)
Date: 17-07-2020
Publisher: Elsevier BV
Date: 05-2007
Publisher: Elsevier BV
Date: 10-2020
Publisher: Wiley
Date: 10-04-2012
Publisher: Springer Science and Business Media LLC
Date: 2008
Publisher: American Chemical Society (ACS)
Date: 03-03-2017
Abstract: Organohalide lead perovskite solar cells have emerged as a promising next-generation thin-film photovoltaic technology. It has been clearly recognized that interfacial engineering plays a critical role in cell performance. It has been also proposed that the open-circuit voltage is dependent on the ionization potential of the hole transport layer at the anode. In this communication, we report a simple modification of the anode with a triarylamine-based small molecule (1), which avoids the need to use standard hole transport materials and delivers a relatively high open-circuit voltage of 1.08 V and a power conversion efficiency of 16.5% in a simple planar architecture.
Publisher: IOP Publishing
Date: 24-02-2006
Publisher: American Chemical Society (ACS)
Date: 17-04-2020
Publisher: Elsevier BV
Date: 2006
Publisher: American Chemical Society (ACS)
Date: 29-08-2018
Publisher: Elsevier BV
Date: 12-2008
Publisher: IOP Publishing
Date: 25-10-2022
Abstract: We report an all-polymer photodiode comprising a new electron-transporting polymer, PNNTH , that contains naphthalene diimide and thiazole moieties. PNNTH has strong absorption at around 670 nm and an electron mobility of ≈10 −4 cm 2 V −1 s −1 . Bulk heterojunction films composed of PNNTH blended with the donor polymer, PBDTT-FTTE , in a weight ratio of 1:2 were found to have electron and hole mobilities of ≈10 −5 cm 2 V −1 s −1 and ≈10 −4 cm 2 V −1 s −1 , respectively. The photoresponse of conventional and inverted organic photodiodes containing the blend could be tuned from broadband (400–800 nm) to narrowband (50 nm full-width-at-half-maximum) simply by changing the thickness of the all-polymer blend. The narrowband response was achieved using the charge collection narrowing mechanism, which was enhanced by the unbalanced charge mobility. Transfer matrix-based optical modelling confirmed the wavelength dependence of the photoresponse. For both the broadband and narrowband photodiodes, the specific detectivity was greater than 10 11 Jones.
Publisher: Elsevier BV
Date: 04-2019
Publisher: Springer Science and Business Media LLC
Date: 04-01-2021
DOI: 10.1038/S41467-020-20272-3
Abstract: Efficient and stable perovskite solar cells with a simple active layer are desirable for manufacturing. Three-dimensional perovskite solar cells are most efficient but need to have improved environmental stability. Inclusion of larger ammonium salts has led to a trade-off between improved stability and efficiency, which is attributed to the perovskite films containing a two-dimensional component. Here, we show that addition of 0.3 mole percent of a fluorinated lead salt into the three-dimensional methylammonium lead iodide perovskite enables low temperature fabrication of simple inverted solar cells with a maximum power conversion efficiency of 21.1%. The perovskite layer has no detectable two-dimensional component at salt concentrations of up to 5 mole percent. The high concentration of fluorinated material found at the film-air interface provides greater hydrophobicity, increased size and orientation of the surface perovskite crystals, and unencapsulated devices with increased stability to high humidity.
Publisher: Elsevier BV
Date: 2021
Publisher: AIP Publishing
Date: 07-01-2013
DOI: 10.1063/1.4773556
Abstract: The effect of a zinc oxide optical spacer layer in broad-band polymer-fullerene solar cells is presented. The complimentary absorption in the donor and acceptor components allows photocurrent generation through photoinduced electron and hole-transfer mechanisms. Simulations of the optical-field distribution reveal that an optical spacer can be used to tune the spectral response to favor one photocurrent generation pathway via enhanced absorption in either the acceptor or donor component. Experimental results confirm these simulations, and the spacer is shown to enhance overall photocurrent in devices with thin active layers (& nm), with much less effect in thicker junctions (& nm).
Publisher: Elsevier BV
Date: 03-2010
No related grants have been discovered for Hui Jin.