300 results found
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
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
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
Fei Z, Gao X, Smith J, et al., 2013, Near Infrared Absorbing Soluble Poly(cyclopenta[2,1-b:3,4-b ']dithiophen-4-one)vinylene Polymers Exhibiting High Hole and Electron Mobilities in Ambient Air, CHEMISTRY OF MATERIALS, Vol: 25, Pages: 59-68, ISSN: 0897-4756
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
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
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
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
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
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