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• Journal article
  Meager I, Ashraf RS, Rossbauer S, Bronstein H, Donaghey JE, Marshall J, Schroeder BC, Heeney M, Anthopoulos TD, McCulloch Iet 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
• Journal article
  Meager I, Ashraf RS, Mollinger S, Schroeder BC, Bronstein H, Beatrup D, Vezie MS, Kirchartz T, Salleo A, Nelson J, McCulloch Iet al., 2013,

  Photocurrent enhancement from diketopyrrolopyrrole polymer solar cells through alkyl-chain branching point manipulation.

  , J Am Chem Soc, Vol: 135, Pages: 11537-11540

  Systematically moving the alkyl-chain branching position away from the polymer backbone afforded two new thieno[3,2-b]thiophene-diketopyrrolopyrrole (DPPTT-T) polymers. When used as donor materials in polymer:fullerene solar cells, efficiencies exceeding 7% were achieved without the use of processing additives. The effect of the position of the alkyl-chain branching point on the thin-film morphology was investigated using X-ray scattering techniques and the effects on the photovoltaic and charge-transport properties were also studied. For both solar cell and transistor devices, moving the branching point further from the backbone was beneficial. This is the first time that this effect has been shown to improve solar cell performance. Strong evidence is presented for changes in microstructure across the series, which is most likely the cause for the photocurrent enhancement.

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• Journal article
  Meager I, Ashraf RS, Mollinger S, Schroeder BC, Bronstein H, Beatrup D, Vezie MS, Kirchartz T, Salleo A, Nelson J, McCulloch Iet al., 2013,

  Photocurrent Enhancement from Diketopyrrolopyrrole Polymer Solar Cells through Alkyl-Chain Branching Point Manipulation

  , JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 135, Pages: 11537-11540, ISSN: 0002-7863
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  • Citations: 254
• Journal article
  Zhang X, Bronstein H, Kronemeijer AJ, Smith J, Kim Y, Kline RJ, Richter LJ, Anthopoulos TD, Sirringhaus H, Song K, Heeney M, Zhang W, McCulloch I, DeLongchamp DMet 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
• Journal article
  Tsoi WC, Zhang W, Hollis JR, Suh M, Heeney M, McCulloch I, Kim J-Set 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.

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• Journal article
  Himmelberger S, Dacuna J, Rivnay J, Jimison LH, McCarthy-Ward T, Heeney M, McCulloch I, Toney MF, Salleo Aet 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
• Journal article
  Ashraf RS, Schroeder BC, Bronstein HA, Huang Z, Thomas S, Kline RJ, Brabec CJ, Rannou P, Anthopoulos TD, Durrant JR, McCulloch Iet al., 2013,

  The Influence of Polymer Purification on Photovoltaic Device Performance of a Series of Indacenodithiophene Donor Polymers

  , ADVANCED MATERIALS, Vol: 25, Pages: 2029-2034, ISSN: 0935-9648
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  • Citations: 121
• Journal article
  Nielsen CB, Sohn E-H, Cho D-J, Schroeder BC, Smith J, Lee M, Anthopoulos TD, Song K, McCulloch Iet al., 2013,

  Improved Field-Effect Transistor Performance of a Benzotrithiophene Polymer through Ketal Cleavage in the Solid State (vol 5, pg 1806, 2013)

  , ACS APPLIED MATERIALS & INTERFACES, Vol: 5, Pages: 2783-2783, ISSN: 1944-8244
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• Journal article
  McCulloch I, 2013,

  Organic Electronics

  , ADVANCED MATERIALS, Vol: 25, Pages: 1811-1812, ISSN: 0935-9648
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  • Citations: 17
• Journal article
  Nielsen CB, Turbiez M, McCulloch I, 2013,

  Recent Advances in the Development of Semiconducting DPP-Containing Polymers for Transistor Applications

  , ADVANCED MATERIALS, Vol: 25, Pages: 1859-1880, ISSN: 0935-9648
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  • Citations: 764
• Journal article
  Bansal N, Reynolds LX, MacLachlan A, Lutz T, Ashraf RS, Zhang W, Nielsen CB, McCulloch I, Rebois DG, Kirchartz T, Hill MS, Molloy KC, Nelson J, Haque SAet 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
• Journal article
  Rumer JW, Dai S-Y, Levick M, Biniek L, Procter DJ, McCulloch Iet al., 2013,

  Synthesis of two dihydropyrroloindoledione-based copolymers for organic electronics

  , JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, Vol: 51, Pages: 1285-1291, ISSN: 0887-624X
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  • Citations: 24
• Journal article
  Nielsen CB, Sohn E-H, Cho D-J, Schroeder BC, Smith J, Lee M, Anthopoulos TD, Song K, McCulloch Iet al., 2013,

  Improved Field-Effect Transistor Performance of a Benzotrithiophene Polymer through Ketal Cleavage in the Solid State

  , ACS APPLIED MATERIALS & INTERFACES, Vol: 5, Pages: 1806-1810, ISSN: 1944-8244
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  • Citations: 23
• Journal article
  Bronstein H, Frost JM, Hadipour A, Kim Y, Nielsen CB, Ashraf RS, Rand BP, Watkins S, McCulloch Iet al., 2013,

  Effect of Fluorination on the Properties of a Donor-Acceptor Copolymer for Use in Photovoltaic Cells and Transistors

  , CHEMISTRY OF MATERIALS, Vol: 25, Pages: 277-285, ISSN: 0897-4756
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  • Citations: 205
• Journal article
  Biniek L, Schroeder BC, Donaghey JE, Yaacobi-Gross N, Ashraf RS, Soon YW, Nielsen CB, Durrant JR, Anthopoulos TD, McCulloch Iet al., 2013,

  New Fused Bis-Thienobenzothienothiophene Copolymers and Their Use in Organic Solar Cells and Transistors

  , Macromolecules, Vol: 46, Pages: 727-735, ISSN: 0024-9297
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