315 results found
Chen Z, Lee MJ, Ashraf RS, et al., 2012, High-Performance Ambipolar Diketopyrrolopyrrole-Thieno[3,2-b]thiophene Copolymer Field-Effect Transistors with Balanced Hole and Electron Mobilities, ADVANCED MATERIALS, Vol: 24, Pages: 647-+, ISSN: 0935-9648
Ambipolar OFETs with balanced hole and electron field-effect mobilities both exceeding 1 cm(2) V(-1) s(-1) are achieved based on a single-solution-processed conjugated polymer, DPPT-TT, upon careful optimization of the device architecture, charge injection, and polymer processing. Such high-performance OFETs are promising for applications in ambipolar devices and integrated circuits, as well as model systems for fundamental studies.
Kirkpatrick J, Nielsen CB, Zhang W, et al., 2012, A Systematic Approach to the Design Optimization of Light-Absorbing Indenofluorene Polymers for Organic Photovoltaics, ADVANCED ENERGY MATERIALS, Vol: 2, Pages: 260-265, ISSN: 1614-6832
Fei Z, Shahid M, Yaacobi-Gross N, et al., 2012, Thiophene fluorination to enhance photovoltaic performance in low band gap donor-acceptor polymers, CHEMICAL COMMUNICATIONS, Vol: 48, Pages: 11130-11132, ISSN: 1359-7345
Shahid M, Ashraf RS, Huang Z, et al., 2012, Photovoltaic and field effect transistor performance of selenophene and thiophene diketopyrrolopyrrole co-polymers with dithienothiophene, JOURNAL OF MATERIALS CHEMISTRY, Vol: 22, Pages: 12817-12823, ISSN: 0959-9428
Brondijk JJ, Maddalena F, Asadi K, et al., 2012, Carrier-density dependence of the hole mobility in doped and undoped regioregular poly(3-hexylthiophene), PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, Vol: 249, Pages: 138-141, ISSN: 0370-1972
Fei Z, Ashraf RS, Huang Z, et al., 2012, Germaindacenodithiophene based low band gap polymers for organic solar cells, CHEMICAL COMMUNICATIONS, Vol: 48, Pages: 2955-2957, ISSN: 1359-7345
Xia R, Al-Hashimi M, Tsoi WC, et al., 2012, Fused pyrrolo[3,2-d:4,5-d ']bisthiazole-containing polymers for using in high-performance organic bulk heterojunction solar cells, SOLAR ENERGY MATERIALS AND SOLAR CELLS, Vol: 96, Pages: 112-116, ISSN: 0927-0248
Gupta D, Brenner TJK, Albert-Seifried S, et al., 2012, Photoconductivity anisotropy study in uniaxially aligned polymer based planar photodiodes, ORGANIC ELECTRONICS, Vol: 13, Pages: 36-42, ISSN: 1566-1199
Kim JS, Fei Z, James DT, et al., 2012, A comparison between dithienosilole and dithienogermole donor-acceptor type co-polymers for organic bulk heterojunction photovoltaic devices, JOURNAL OF MATERIALS CHEMISTRY, Vol: 22, Pages: 9975-9982, ISSN: 0959-9428
Kronemeijer AJ, Gili E, Shahid M, et al., 2012, High-Mobility Ambipolar Transistors: Properties and Function, ORGANIC FIELD-EFFECT TRANSISTORS XI, Vol: 8478, ISSN: 0277-786X
Shoaee S, Clarke TM, Eng MP, et al., 2012, Charge photogeneration in donor/acceptor organic solar cells, JOURNAL OF PHOTONICS FOR ENERGY, Vol: 2, ISSN: 1947-7988
Shahid M, McCarthy-Ward T, Labram J, et al., 2012, Low band gap selenophene-diketopyrrolopyrrole polymers exhibiting high and balanced ambipolar performance in bottom-gate transistors, Chemical Science, Vol: 3, Pages: 181-185, ISSN: 2041-6520
We report the synthesis of a selenophene-diketopyrrolopyrrole monomer and its co-polymerisation with selenophene and thieno[3,2-b]thiophene monomers by Stille coupling. The resulting low band gap polymers exhibit ambipolar charge transport in organic field effect transistors. High and balanced electron and hole mobilities in excess of 0.1 cm2 V-1 s-1 were observed in bottom-gate, bottom-contact devices, suggesting that selenophene inclusion is a promising strategy for the development of ambipolar organic semiconductors.
Fei Z, Kim Y, Smith J, et al., 2012, Comparative Optoelectronic Study between Copolymers of Peripherally Alkylated Dithienosilole and Dithienogermole, Macromolecules
Here we report a simple methodology for the synthesis of dithienosilole and dithienogermole monomers in which the necessary solubilizing long chain alkyl groups are incorporated into the peripheral 3,5-positions of the fused ring. We report four novel monomers in which methyl or butyl groups are attached to the bridging Si and Ge atom. Copolymers with bithiophene were synthesized by a Stille polymerization in high molecular weight. We report the optical, electrical, electrochemical and morphological properties of the resulting polymers. We find that the nature of the bridging heteroatom (Si or Ge) has only a minor influence on these properties, whereas the nature of the alkyl chain attached to the bridging atom is found to have a much larger effect.
Koch FPV, Heeney M, 2012, The synthesis of conjugated polythiophenes by Kumada cross-coupling, Weinheim, Germany, Publisher: Wiley-VCH Verlag GmbH & Co
McCulloch I, Heeney M, Nielsen C, et al., 2012, WO2012131084. Triaryl- and triheteroaryl- benzene monomers and polymers for electrooptical applications.
The invention relates to mono-, oligo- and polymeric compds. comprising substituted triaryl- and triheteroaryl benzene groups and their copolymers. The invention further relates to the methods of their synthesis, to org. semiconducting materials and blends, formulations and layers comprising them, and to electronic devices, like org. field effect transistors (OFETs) and org. photovoltaics (OPVs), comprising them. [on SciFinder(R)]
Jamieson FC, Domingo EB, McCarthy-Ward T, et al., 2012, Fullerene crystallisation as a key driver of charge separation in polymer/fullerene bulk heterojunction solar cells, Chemical Science, Vol: 3, Pages: 485-492, ISSN: 2041-6520
Solution processed polymer/fullerene blend films are receiving extensive attention as the photoactive layer of organic solar cells. In this paper we report a range of photophysical, electrochemical, physicochemical and structural data which provide evidence that formation of a relatively pure, molecularly ordered phase of the fullerene component, phenyl-C61-butyric acid methyl ester (PCBM), may be the key factor driving the spatial separation of photogenerated electrons and holes in many of these devices. PCBM crystallisation is shown to result in an increase in its electron affinity, providing an energetic driving force for spatial separation of electrons and holes. Based upon our observations, we propose a functional model applicable to many organic bulk heterojunction devices based upon charge generation in a finely intermixed polymer/fullerene phase followed by spatial separation of electrons and holes at the interface of this mixed phase with crystalline PCBM domains. This model has significant implications for the design of alternative acceptor materials to PCBM for organic solar cells.
Oosterhout SD, Wienk MM, Al-Hashimi M, et al., 2011, Hybrid Polymer Solar Cells from Zinc Oxide and Poly(3-hexylselenophene), JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 115, Pages: 18901-18908, ISSN: 1932-7447
Zhang XR, Richter LJ, DeLongchamp DM, et al., 2011, Molecular Packing of High-Mobility Diketo Pyrrolo-Pyrrole Polymer Semiconductors with Branched Alkyl Side Chains, J AM CHEM SOC, Vol: 133, Pages: 15073-15084, ISSN: 0002-7863
Chen Z, Bird M, Lemaur V, et al., 2011, Origin of the different transport properties of electron and hole polarons in an ambipolar polyselenophene-based conjugated polymer, PHYSICAL REVIEW B, Vol: 84, ISSN: 2469-9950
Lilliu S, Agostinelli T, Verploegen E, et al., 2011, Effects of Thermal Annealing Upon the Nanomorphology of Poly(3-hexylselenophene)-PCBM Blends, MACROMOLECULAR RAPID COMMUNICATIONS, Vol: 32, Pages: 1454-1460, ISSN: 1022-1336
Bronstein H, Leem DS, Hamilton R, et al., 2011, Indacenodithiophene-co-benzothiadiazole Copolymers for High Performance Solar Cells or Transistors via Alkyl Chain Optimization, MACROMOLECULES, Vol: 44, Pages: 6649-6652, ISSN: 0024-9297
Schulz L, Willis M, Nuccio L, et al., 2011, Importance of intramolecular electron spin relaxation in small molecule semiconductors, PRB, Vol: 84
Abrusci A, Ding I-K, Al-Hashimi M, et al., 2011, Facile infiltration of semiconducting polymer into mesoporous electrodes for hybrid solar cells, ENERGY & ENVIRONMENTAL SCIENCE, Vol: 4, Pages: 3051-3058, ISSN: 1754-5692
Al-Hashimi M, Baklar MA, Colleaux F, et al., 2011, Synthesis, Characterization, and Field Effect Transistor Properties of Regioregular Poly(3-alkyl-2,5-selenylenevinylene), MACROMOLECULES, Vol: 44, Pages: 5194-5199, ISSN: 0024-9297
Rance WL, Ferguson AJ, McCarthy-Ward T, et al., 2011, Photainduced Carrier Generation and Decay Dynamics in Intercalated and Non-intercalated Polymer: Fullerene Bulk Heterojunctions, ACS NANO, Vol: 5, Pages: 5635-5646, ISSN: 1936-0851
Abrusci A, Sai R, Kumar S, et al., 2011, Infl ence of Ion Ind ced Local Co lo b Field and Pola ity on Cha ge Gene ation and Effi ciency in Poly (3-Hexylthiophene) Based Solid-State Dye-Sensitized Solar Cells, Adv. Funct. Mater, 2011, Pages: 1-9
Baumann A, Savenije TJ, Murthy DHK, et al., 2011, Influence of Phase Segregation on Recombination Dynamics in Organic Bulk-Heterojunction Solar Cells, ADVANCED FUNCTIONAL MATERIALS, Vol: 21, Pages: 1687-1692, ISSN: 1616-301X
Maurano A, Shuttle CC, Hamilton R, et al., 2011, Transient Optoelectronic Analysis of Charge Carrier Losses in a Selenophene/Fullerene Blend Solar Cell, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 115, Pages: 5947-5957, ISSN: 1932-7447
Miller NC, Gysel R, Miller CE, et al., 2011, The Phase Behavior of a Polymer-Fullerene Bulk Heterojunction System that Contains Bimolecular Crystals, JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, Vol: 49, Pages: 499-503, ISSN: 0887-6266
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