329 results found
Zhong H, Li Z, Buchaca-Domingo E, et al., 2013, Low band gap dithienogermolodithiophene copolymers with tunable acceptors and side-chains for organic solar cells, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 1, Pages: 14973-14981, ISSN: 2050-7488
Economopoulos SP, Chochos CL, Ioannidou HA, et al., 2013, Novel BODIPY-based conjugated polymers donors for organic photovoltaic applications, RSC ADVANCES, Vol: 3, Pages: 10221-10229, ISSN: 2046-2069
Westacott P, Tumbleston JR, Shoaee S, et al., 2013, On the role of intermixed phases in organic photovoltaic blends, Energy & Environmental Science, ISSN: 1754-5692
Shahid M, Padamsey N, Labram J, et al., 2013, Synthesis of tetraselenophenoporphyrazine and its application in transistor devices, Journal of Materials Chemistry C, Vol: 1, Pages: 6198-6201, ISSN: 2050-7526
We report the first synthesis of a soluble selenophene containing porphyrazine derivative, tetraselenophenoporphyrazine (SePz). Thin films of SePz exhibit a broad and strong absorption in the visible to near-IR region, which is red shifted compared to the thiophene analogue, and demonstrate p-type carrier mobilities of 10-2 cm2 V-1 s-1 in bottom gate, bottom contact field effect transistors.
Bannock JH, Krishnadasan SH, Nightingale AM, et al., 2012, Continuous Synthesis of Device-Grade Semiconducting Polymers in Droplet-Based Microreactors, Advanced Functional Materials
A method is reported for the controlled synthesis of device-grade semiconducting polymers, utilizing a droplet-based microfluidic reactor. Using poly(3-hexylthiophene) (P3HT) as a test material, the reactor is shown to provide a controlled and stable environment for polymer synthesis, enabling control of molecular weight via tuning of flow conditions, reagent composition or temperature. Molecular weights of up to 92 000 Da are readily attainable, without leakage or reactor fouling. The method avoids the usual deterioration in materials quality that occurs when conventional batch syntheses are scaled from the sub-gram level to higher quantities, with a prototype five-channel reactor producing material of consistent molecular weight distribution and high regioregularity (>98%) at a rate of ≈60 g/day. The droplet-synthesized P3HT compares favorably with commercial material in terms of absorption spectrum, polydispersity, regioregularity, and crystallinity, yielding power conversion efficiencies of up to 4% in bulk heterojunction solar cells with [6,6]-phenyl-C61-butyric acid methyl ester.
Miller NC, Cho E, Junk MJN, et al., 2012, Use of X-Ray Diffraction, Molecular Simulations, and Spectroscopy to Determine the Molecular Packing in a Polymer-Fullerene Bimolecular Crystal, ADVANCED MATERIALS, Vol: 24, Pages: 6071-+, ISSN: 0935-9648
Tsoi WC, James DT, Domingo EB, et al., 2012, Effects of a Heavy Atom on Molecular Order and Morphology in Conjugated Polymer:Fullerene Photovoltaic Blend Thin Films and Devices, ACS NANO, Vol: 6, Pages: 9646-9656, ISSN: 1936-0851
Miller NC, Cho E, Gysel R, et al., 2012, Factors Governing Intercalation of Fullerenes and Other Small Molecules Between the Side Chains of Semiconducting Polymers Used in Solar Cells, ADVANCED ENERGY MATERIALS, Vol: 2, Pages: 1208-1217, ISSN: 1614-6832
Treat ND, Varotto A, Takacs CJ, et al., 2012, Polymer-Fullerene Miscibility: A Metric for Screening New Materials for High-Performance Organic Solar Cells, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 134, Pages: 15869-15879, ISSN: 0002-7863
McGlashon A, Zhang W, Smilgies DM, et al., 2012, Spectroscopic and morphological investigation of conjugated photopolymerisable quinquethiophene liquid crystals, CURRENT APPLIED PHYSICS, Vol: 12, Pages: E59-E66, ISSN: 1567-1739
Zhong H, Smith J, Rossbauer S, et al., 2012, Air-Stable and High-Mobility n-Channel Organic Transistors Based on Small-Molecule/Polymer Semiconducting Blends, ADVANCED MATERIALS, Vol: 24, Pages: 3205-3211, ISSN: 0935-9648
Smith J, Zhang W, Sougrat R, et al., 2012, Solution-Processed Small Molecule-Polymer Blend Organic Thin-Film Transistors with Hole Mobility Greater than 5 cm2/Vs, ADVANCED MATERIALS, Vol: 24, Pages: 2441-2446, ISSN: 0935-9648
Kronemeijer AJ, Gili E, Shahid M, et al., 2012, A Selenophene-Based Low-Bandgap Donor-Acceptor Polymer Leading to Fast Ambipolar Logic, ADVANCED MATERIALS, Vol: 24, Pages: 1558-1565, ISSN: 0935-9648
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
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
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
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)]
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.
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.
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.
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