Publications
150 results found
Aristidou N, Sanchez-Molina I, Chotchuangchutchaval T, et al., 2015, The role of oxygen in the degradation of methylammonium lead trihalide perovskite photoactive layers, Angewandte Chemie-International Edition, Vol: 54, Pages: 8208-8212, ISSN: 1521-3773
In this paper we report on the influence of light and oxygen on the stability of CH3NH3PbI3 perovskite-based photoactive layers. When exposed to both light and dry air the mp-Al2O3/CH3NH3PbI3 photoactive layers rapidly decompose yielding methylamine, PbI2, and I2 as products. We show that this degradation is initiated by the reaction of superoxide (O2−) with the methylammonium moiety of the perovskite absorber. Fluorescent molecular probe studies indicate that the O2− species is generated by the reaction of photoexcited electrons in the perovskite and molecular oxygen. We show that the yield of O2− generation is significantly reduced when the mp-Al2O3 film is replaced with an mp-TiO2 electron extraction and transport layer. The present findings suggest that replacing the methylammonium component in CH3NH3PbI3 to a species without acid protons could improve tolerance to oxygen and enhance stability.
Rath T, Gury L, Sanchez-Molina I, et al., 2015, Formation of porous SnS nanoplate networks from solution and their application in hybrid solar cells, Chemical Communications, Vol: 51, Pages: 10198-10201, ISSN: 1364-548X
Herein, we present a facile solution-based route towards nanostructured, hybrid absorber layers based on tin mono-sulfide (SnS), an emerging, non-toxic absorber material for low-cost and large-scale PV applications. Charge photogeneration properties in the hybrid system are studied using transient absorption spectroscopy and fabricated solar cells show efficient photocurrent generation over a broad spectral range.
Cao Y, Bernechea M, Maclachlan A, et al., 2015, Solution Processed Bismuth Sulfide Nanowire Array Core/Silver Sulfide Shell Solar Cells, CHEMISTRY OF MATERIALS, Vol: 27, Pages: 3700-3706, ISSN: 0897-4756
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- Citations: 32
O'Mahony FTF, Lee YH, Jellett C, et al., 2015, Improved environmental stability of organic lead trihalide perovskite-based photoactive-layers in the presence of mesoporous TiO2, Journal of Materials Chemistry A, Vol: 3, Pages: 7219-7223, ISSN: 2050-7496
Impressive hybrid photovoltaic device performances have been realised with the methylammonium lead triiodide (MAPbI3) perovskite absorber in a wide range of device architectures. However, the question as to which of these systems represents the most commercially viable long-term prospect is yet to be answered conclusively. Here, we report on the photoinduced charge transfer processes in MAPbI3 based films measured under inert and ambient conditions. When exposed to ambient conditions, the coated mesoporous Al2O3 and bilayer systems show a rapid and significant degradation in the yield of long-lived charge separation. This process, which does not affect sensitized-mesoporous TiO2 films, is only found to occur when both light and oxygen are present. These observations indicate that the presence of a mesostructured TiO2 electron acceptor to rapidly extract the photoexcited electron from the perovskite sensitizer may be crucial for fundamental photovoltaic stability and significantly increases innate tolerance to environmental conditions. This work highlights a significant advantage of retaining mesoscale morphological control in the design of perovskite photovoltaics.
MacLachlan AJ, Rath T, Cappel UB, et al., 2015, Polymer/Nanocrystal Hybrid Solar Cells: Influence of Molecular Precursor Design on Film Nanomorphology, Charge Generation and Device Performance, ADVANCED FUNCTIONAL MATERIALS, Vol: 25, Pages: 409-420, ISSN: 1616-301X
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- Citations: 42
Li X, Hu Y, Sanchez-Molina I, et al., 2015, Insight into quinoxaline containing D-π-A dyes for dye-sensitized solar cells with cobalt and iodine based electrolytes: the effect of π-bridge on the HOMO energy level and photovoltaic performance, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 3, Pages: 21733-21743, ISSN: 2050-7488
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- Citations: 50
Guilbert AAY, Schmidt M, Bruno A, et al., 2014, Spectroscopic Evaluation of Mixing and Crystallinity of Fullerenes in Bulk Heterojunctions, ADVANCED FUNCTIONAL MATERIALS, Vol: 24, Pages: 6972-6980, ISSN: 1616-301X
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- Citations: 26
Bruno A, Borriello C, Haque SA, et al., 2014, Ternary hybrid systems of P3HT-CdSe-WS<sub>2</sub> nanotubes for photovoltaic applications, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 16, Pages: 17998-18003, ISSN: 1463-9076
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- Citations: 19
Pearson AJ, Watters DC, Yi H, et al., 2014, Impact of dithienyl or thienothiophene units on the optoelectronic and photovoltaic properties of benzo[1,2,5]thiadiazole based donor–acceptor copolymers for organic solar cell devices, RSC Advances, Vol: 4, Pages: 43142-43149, ISSN: 2046-2069
We report a comparative study on four donor–acceptor benzothiadiazole-based copolymers containing dithienyl or thienothiophene moieties for application in organic photovoltaic (OPV) devices. Bulk-heterojunction OPV devices are fabricated having power conversion efficiencies ranging between 4 and 6%. Morphological, spectroscopic and charge-transport measurements are used to investigate the influence of either the dithienyl or thienothiophene moieties on the structure and photophysical properties of the copolymer and copolymer:PC71BM blend films and rationalise the solar cell characteristics. Although all copolymer:PC71BM blends exhibit comparable hole polaron yields, solar cell devices with the highest power conversion efficiencies are correlated with increased charge-carrier mobility of the copolymer and enhanced aggregation of PC71BM in the blend.
Lindblad R, Cappel UB, O'Mahony FTF, et al., 2014, Energy level alignment in TiO<sub>2</sub>/metal sulfide/polymer interfaces for solar cell applications, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 16, Pages: 17099-17107, ISSN: 1463-9076
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- Citations: 11
Martinez L, Higuchi S, MacLachlan AJ, et al., 2014, Improved electronic coupling in hybrid organic-inorganic nanocomposites employing thiol-functionalized P3HT and bismuth sulfide nanocrystals, Nanoscale, Vol: 6, Pages: 10018-10026, ISSN: 2040-3372
In this study, we employ a thiol-functionalized polymer (P3HT-SH) as a leverage to tailor the nanomorphology and electronic coupling in polymer–nanocrystal composites for hybrid solar cells. The presence of the thiol functional group allows for a highly crystalline semiconducting polymer film at low thiol content and allows for improved nanomorphologies in hybrid organic–inorganic systems when employing non-toxic bismuth sulfide nanocrystals. The exciton dissociation efficiency and carrier dynamics at this hybrid heterojunction are investigated through photoluminescence quenching and transient absorption spectroscopy measurements, revealing a larger degree of polaron formation when P3HT-SH is employed, suggesting an increased electronic interaction between the metal chalcogenide nanocrystals and the thiol-functionalized P3HT. The fabricated photovoltaic devices show 15% higher power conversion efficiencies as a result of the improved nanomorphology and better charge transfer mechanism together with the higher open circuit voltages arising from the deeper energy levels of P3HT-SH.
MacLachlan AJ, O'Mahony FTF, Sudlow AL, et al., 2014, Solution- Processed Mesoscopic Bi2S3: Polymer Photoactive Layers, CHEMPHYSCHEM, Vol: 15, Pages: 1019-1023, ISSN: 1439-4235
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- Citations: 30
Bruno A, Di Luccio T, Borriello C, et al., 2014, Exciton Dynamics in Hybrid Polymer/QD Blends, E-MRS Spring Meeting / Symposium D on Advanced Inorganic Materials and Structures for Photovoltaics, Publisher: ELSEVIER SCIENCE BV, Pages: 167-175, ISSN: 1876-6102
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- Citations: 6
Wood S, Garnett O, Tokmoldin N, et al., 2014, <i>In situ</i> formation of organic-inorganic hybrid nanostructures for photovoltaic applications, FARADAY DISCUSSIONS, Vol: 174, Pages: 267-279, ISSN: 1359-6640
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- Citations: 3
Piper RB, Yoshida M, Farrell DJ, et al., 2014, Kinetic insight into bimolecular upconversion: experiment and simulation, RSC ADVANCES, Vol: 4, Pages: 8059-8063
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- Citations: 16
Cappel UB, Dowland SA, Reynolds LX, et al., 2013, Charge Generation Dynamics in CdS:P3HT Blends for Hybrid Solar Cells, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, Vol: 4, Pages: 4253-4257, ISSN: 1948-7185
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- Citations: 28
Arar M, Gruber M, Edler M, et al., 2013, Influence of morphology and polymer: nanoparticle ratio on device performance of hybrid solar cells-an approach in experiment and simulation, NANOTECHNOLOGY, Vol: 24, ISSN: 0957-4484
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- Citations: 24
Yan C, Cadby AJ, Parnell AJ, et al., 2013, Photophysics and Morphology of a Polyfluorene Donor-Acceptor Triblock Copolymer for Solar Cells, JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, Vol: 51, Pages: 1705-1718, ISSN: 0887-6266
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- Citations: 6
O'Mahony FTF, Cappel UB, Tokmoldin N, et al., 2013, Low-Temperature Solution Processing of Mesoporous Metal-Sulfide Semiconductors as Light-Harvesting Photoanodes, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 52, Pages: 12047-12051, ISSN: 1433-7851
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- Citations: 23
Bruno A, Borriello C, Di Luccio T, et al., 2013, White light-emitting nanocomposites based on an oxadiazole-carbazole copolymer (POC) and InP/ZnS quantum dots, JOURNAL OF NANOPARTICLE RESEARCH, Vol: 15, ISSN: 1388-0764
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- Citations: 19
Paquin F, Yamagata H, Hestand NJ, et al., 2013, Two-dimensional spatial coherence of excitons in semicrystalline polymeric semiconductors: Effect of molecular weight, PHYSICAL REVIEW B, Vol: 88, ISSN: 2469-9950
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- Citations: 89
Bruno A, Reynolds LX, Dyer-Snaith C, et al., 2013, Determining the Exciton Diffusion Length in a Polyfluorene from Ultrafast Fluorescence Measurements of Polymer/Fullerene Blend Films, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 117, Pages: 19832-19838, ISSN: 1932-7447
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- Citations: 45
Hellmann C, Paquin F, Treat ND, et al., 2013, Controlling the Interaction of Light with Polymer Semiconductors, ADVANCED MATERIALS, Vol: 25, Pages: 4906-4911, ISSN: 0935-9648
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- Citations: 43
Bruno A, Del Mauro ADG, Nenna G, et al., 2013, Insights on photophysical proprieties of DCM dye in PVK host matrix, POLYMER COMPOSITES, Vol: 34, Pages: 1500-1505, ISSN: 0272-8397
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- Citations: 3
Bansal N, O'Mahony FTF, Lutz T, et al., 2013, Solution Processed Polymer-Inorganic Semiconductor Solar Cells Employing Sb2S3as a Light Harvesting and Electron Transporting Material, Advanced Energy Materials, Pages: n/a-n/a, ISSN: 1614-6832
Bansal N, Reynolds LX, MacLachlan A, et al., 2013, Influence of Crystallinity and Energetics on Charge Separation in Polymer-Inorganic Nanocomposite Films for Solar Cells, SCIENTIFIC REPORTS, Vol: 3, ISSN: 2045-2322
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- Citations: 80
Nightingale AM, Bannock JH, Krishnadasan SH, et al., 2013, Large-scale synthesis of nanocrystals in a multichannel droplet reactor, Journal of Materials Chemistry A
Bruno A, Del Mauro ADG, Nenna G, et al., 2013, Electroluminescence and fluorescence emission of poly(n-vinylcarbazole) and poly(n-vinylcarbazole)-Ir(ppy)<sub>3</sub>-based organic light-emitting devices prepared with different solvents, JOURNAL OF PHOTONICS FOR ENERGY, Vol: 3, ISSN: 1947-7988
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- Citations: 10
Planells M, Reynolds LX, Bansode U, et al., 2013, Synthesis and optical characterisation of triphenylamine-based hole extractor materials for CdSe quantum dots, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 15, Pages: 7679-7684, ISSN: 1463-9076
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- Citations: 6
Dowland SA, Reynolds LX, MacLachlan A, et al., 2013, Photoinduced electron and hole transfer in CdS:P3HT nanocomposite films: effect of nanomorphology on charge separation yield and solar cell performance, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 1, Pages: 13896-13901, ISSN: 2050-7488
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- Citations: 25
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