Publications
421 results found
Yaacobi-Gross N, Treat ND, Pattanasattayavong P, et al., 2014, High-Efficiency Organic Photovoltaic Cells Based on the Solution-Processable Hole Transporting Interlayer Copper Thiocyanate (CuSCN) as a Replacement for PEDOT:PSS, Advanced Energy Materials, Vol: 5, ISSN: 1614-6840
The use of copper thiocyanate (CuSCN) as a universal solution-processable and highly transparent hole-transporting layer in organic bulk-heterojunction photovoltaic cells is demonstrated. When CuSCN is employed as a replacement for the commonly used poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS), organic solar cells with maximum power conversion efficiency of 8%, are realized; this value is 1.27 times higher than that for optimized control cells based on PEDOT:PSS.
Kesava SV, Fei Z, Rimshaw AD, et al., 2014, Domain Compositions and Fullerene Aggregation Govern Charge Photogeneration in Polymer/Fullerene Solar Cells, ADVANCED ENERGY MATERIALS, Vol: 4, ISSN: 1614-6832
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- Citations: 78
Kim JS, Fei Z, Wood S, et al., 2014, Germanium- and Silicon-Substituted Donor–Acceptor Type Copolymers: Effect of the Bridging Heteroatom on Molecular Packing and Photovoltaic Device Performance, Advanced Energy Materials
The effects of heteroatom substitution from a silicon atom to a germanium atom in donor-acceptor type low band gap copolymers, poly[(4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′,3′-d]silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl] (PSiBTBT) and poly[(4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′,3′-d]germole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl] (PGeBTBT), are studied. The optoelectronic and charge transport properties of these polymers are investigated with a particular focus on their use for organic photovoltaic (OPV) devices in blends with phenyl-C70-butyric acid methyl ester (PC70BM). It is found that the longer C-Ge bond length, in comparison to C-Si, modifies the molecular conformation and leads to a more planar chain conformation in PGeBTBT than PSiBTBT. This increase in molecular planarity leads to enhanced crystallinity and an increased preference for a face-on backbone orientation, thus leading to higher charge carrier mobility in the diode configuration. These results provide important insight into the impact of the heavy atom substitution on the molecular packing and device performance of polymers based on the poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b]-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole) (PCPDTBT) backbone.
Dattani R, Bannock JH, Fei Z, et al., 2014, A general mechanism for controlling thin film structures in all-conjugated block copolymer: fullerene blends, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 2, Pages: 14711-14719, ISSN: 2050-7488
Bannock JH, Krishnadasan SH, Heeney M, et al., 2014, A gentle introduction to the noble art of flow chemistry, MATERIALS HORIZONS, Vol: 1, Pages: 373-378, ISSN: 2051-6347
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- Citations: 35
Taroni PJ, Hoces I, Stingelin N, et al., 2014, Thermoelectric Materials: A Brief Historical Survey from Metal Junctions and Inorganic Semiconductors to Organic Polymers, ISRAEL JOURNAL OF CHEMISTRY, Vol: 54, Pages: 534-552, ISSN: 0021-2148
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- Citations: 29
Marsh HS, Reid OG, Barnes G, et al., 2014, Control of Polythiophene Film Microstructure and Charge Carrier Dynamics Through Crystallization Temperature, JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, Vol: 52, Pages: 700-707, ISSN: 0887-6266
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- Citations: 12
Casey A, Ashraf RS, Fei Z, et al., 2014, Thioalkyl-Substituted Benzothiadiazole Acceptors: Copolymerization with Carbazole Affords Polymers with Large Stokes Shifts and High Solar Cell Voltages, MACROMOLECULES, Vol: 47, Pages: 2279-2288, ISSN: 0024-9297
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- Citations: 63
Soon YW, Shoaee S, Ashraf RS, et al., 2014, Material Crystallinity as a Determinant of Triplet Dynamics and Oxygen Quenching in Donor Polymers for Organic Photovoltaic Devices, ADVANCED FUNCTIONAL MATERIALS, Vol: 24, Pages: 1474-1482, ISSN: 1616-301X
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- Citations: 69
Buchaca-Domingo E, Ferguson AJ, Jamieson FC, et al., 2014, Additive-assisted supramolecular manipulation of polymer:fullerene blend phase morphologies and its influence on photophysical processes, MATERIALS HORIZONS, Vol: 1, Pages: 270-279, ISSN: 2051-6347
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- Citations: 56
Yau CP, Fei Z, Ashraf RS, et al., 2014, Influence of the Electron Deficient Co-Monomer on the Optoelectronic Properties and Photovoltaic Performance of Dithienogermole-based Co-Polymers, ADVANCED FUNCTIONAL MATERIALS, Vol: 24, Pages: 678-687, ISSN: 1616-301X
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- Citations: 53
Marshall J, Schroeder BC, Bronstein H, et al., 2014, Benzocarborano[2,1-<i>b</i>:3,4-<i>b</i>′]dithiophene Containing Conjugated Polymers: Synthesis, Characterization, and Optoelectronic Properties, MACROMOLECULES, Vol: 47, Pages: 89-96, ISSN: 0024-9297
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- Citations: 18
Marshall J, Hooton J, Han Y, et al., 2014, Polythiophenes with vinylene linked <i>ortho</i>, <i>meta</i> and <i>para</i>-carborane sidechains, POLYMER CHEMISTRY, Vol: 5, Pages: 6190-6199, ISSN: 1759-9954
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- Citations: 19
Bannock JH, Al-Hashimi M, Krishnadasan SH, et al., 2014, Controlled synthesis of conjugated random copolymers in a droplet-based microreactor, Materials Horizons
Marshall J, Fei Z, Yau CP, et al., 2014, Incorporation of benzocarborane into conjugated polymer systems: synthesis, characterisation and optoelectronic properties, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 2, Pages: 232-239, ISSN: 2050-7526
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- Citations: 17
Scarongella M, Paraecattil AA, Buchaca-Domingo E, et al., 2014, The influence of microstructure on charge separation dynamics in organic bulk heterojunction materials for solar cell applications, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 2, Pages: 6218-6230, ISSN: 2050-7488
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- Citations: 47
Koch FPV, Rivnay J, Foster S, et al., 2013, The impact of molecular weight on microstructure and charge transport in semicrystalline polymer Semiconductors poly(3-hexylthiophene), a model study, PROGRESS IN POLYMER SCIENCE, Vol: 38, Pages: 1978-1989, ISSN: 0079-6700
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- Citations: 238
Koch FPV, Heeney M, Smith P, 2013, Thermal and Structural Characteristics of Oligo(3-hexylthiophene)s (3HT)<i><sub>n</sub></i>, <i>n</i>=4-36, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 135, Pages: 13699-13709, ISSN: 0002-7863
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- Citations: 100
Koch FPV, Smith P, Heeney M, 2013, "Fibonacci's Route" to Regioregular Oligo(3-hexylthiophene)s, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 135, Pages: 13695-13698, ISSN: 0002-7863
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- Citations: 79
Heeney MJ, Al-Raqa SA, Auger A, et al., 2013, Routes to some 3,6-disubstituted phthalonitriles and examples of phthalocyanines derived therefrom. An overview, JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, Vol: 17, Pages: 649-664, ISSN: 1088-4246
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- Citations: 6
Musser AJ, Al-Hashimi M, Maiuri M, et al., 2013, Activated Singlet Exciton Fission in a Semiconducting Polymer, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 135, Pages: 12747-12754, ISSN: 0002-7863
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- Citations: 135
Mei Y, Loth MA, Payne M, et al., 2013, High Mobility Field-Effect Transistors with Versatile Processing from a Small-Molecule Organic Semiconductor, ADVANCED MATERIALS, Vol: 25, Pages: 4352-4357, ISSN: 0935-9648
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- Citations: 124
Meager I, Ashraf RS, Rossbauer S, et al., 2013, Alkyl Chain Extension as a Route to Novel Thieno[3,2-<i>b</i>]thiophene Flanked Diketopyrrolopyrrole Polymers for Use in Organic Solar Cells and Field Effect Transistors, MACROMOLECULES, Vol: 46, Pages: 5961-5967, ISSN: 0024-9297
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- Citations: 65
Zhang X, Bronstein H, Kronemeijer AJ, et al., 2013, Molecular origin of high field-effect mobility in an indacenodithiophene-benzothiadiazole copolymer, NATURE COMMUNICATIONS, Vol: 4, ISSN: 2041-1723
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- Citations: 363
Lee MJ, Chen Z, di Pietro R, et al., 2013, Electrooptical Spectroscopy of Uniaxially Aligned Polythiophene Films in Field-Effect Transistors, CHEMISTRY OF MATERIALS, Vol: 25, Pages: 2075-2082, ISSN: 0897-4756
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- Citations: 22
Nuccio L, Willis M, Schulz L, et al., 2013, Importance of Spin-Orbit Interaction for the Electron Spin Relaxation in Organic Semiconductors, PHYSICAL REVIEW LETTERS, Vol: 110, ISSN: 0031-9007
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- Citations: 59
Tsoi WC, Zhang W, Hollis JR, et al., 2013, In-situ monitoring of molecular vibrations of two organic semiconductors in photovoltaic blends and their impact on thin film morphology, Applied Physics Letters, Vol: 102, ISSN: 1077-3118
We report in-situ simultaneous monitoring of molecular vibrations of two components in organic photovoltaic blends using resonant Raman spectroscopy. Blend films were composed of a low bandgap copolymer thieno[3,2-b]thiophene-diketopyrrolopyrrole (DPPTTT) and (6,6)-phenyl-C71-butyric acid ester (PC 70BM). Changes in Raman spectra associated with crystallization processes of each component and their impact on thin film morphology were studied during thermal annealing and cooling processes. Transition temperatures to crystalline phases in blends were measured at ∼150 °C and ∼170 °C for DPPTTT and PC 70BM, respectively. Such phase changes lead to modifications in local chemical composition reducing relative Raman peak intensities (IPC70BM/IDPPTTT) from ∼0.4 in PC 70BM-rich domains to ∼0.15 in homogeneous areas.
Himmelberger S, Dacuna J, Rivnay J, et al., 2013, Effects of Confinement on Microstructure and Charge Transport in High Performance Semicrystalline Polymer Semiconductors, ADVANCED FUNCTIONAL MATERIALS, Vol: 23, Pages: 2091-2098, ISSN: 1616-301X
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- Citations: 78
Marshall J, Heeney MJ, Beavis P, 2013, Development of fully conjugated polymers containing benzocarborane, 245th National Spring Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Zhong H, Li Z, Deledalle F, et al., 2013, Fused Dithienogermolodithiophene Low Band Gap Polymers for High-Performance Organic Solar Cells without Processing Additives, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 135, Pages: 2040-2043, ISSN: 0002-7863
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- Citations: 138
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