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• Journal article
  Bakulin AA, Dimitrov SD, Rao A, Chow PCY, Nielsen CB, Schroeder BC, McCulloch I, Bakker HJ, Durrant JR, Friend RHet al., 2013,

  Charge-Transfer State Dynamics Following Hole and Electron Transfer in Organic Photovoltaic Devices

  , JOURNAL OF PHYSICAL CHEMISTRY LETTERS, Vol: 4, Pages: 209-215, ISSN: 1948-7185
  • Author Web Link
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  • Citations: 116
• Journal article
  Bronstein H, Collado-Fregoso E, Hadipour A, Soon YW, Huang Z, Dimitrov SD, Ashraf RS, Rand BP, Watkins SE, Tuladhar PS, otherset al., 2013,

  Thieno [3, 2-b] thiophene-diketopyrrolopyrrole Containing Polymers for Inverted Solar Cells Devices with High Short Circuit Currents

  , Advanced Functional Materials
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• Journal article
  Rumer JW, Dai S-Y, Levick M, Kim Y, Madec M-B, Ashraf RS, Huang Z, Rossbauer S, Schroeder B, Biniek L, Watkins SE, Anthopoulos TD, Janssen RAJ, Durrant JR, Procter DJ, McCulloch Iet al., 2013,

  Dihydropyrroloindoledione-based copolymers for organic electronics

  , JOURNAL OF MATERIALS CHEMISTRY C, Vol: 1, Pages: 2711-2716, ISSN: 2050-7526
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  • Citations: 18
• Journal article
  Nielsen CB, Voroshazi E, Holliday S, Cnops K, Rand BP, McCulloch Iet al., 2013,

  Efficient truxenone-based acceptors for organic photovoltaics

  , JOURNAL OF MATERIALS CHEMISTRY A, Vol: 1, Pages: 73-76, ISSN: 2050-7488
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  • Citations: 44
• Journal article
  Rumer JW, Levick M, Dai S-Y, Rossbauer S, Huang Z, Biniek L, Anthopoulos TD, Durrant JR, Procter DJ, McCulloch Iet al., 2013,

  BPTs: thiophene-flanked benzodipyrrolidone conjugated polymers for ambipolar organic transistors

  , CHEMICAL COMMUNICATIONS, Vol: 49, Pages: 4465-4467, ISSN: 1359-7345
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  • Citations: 60
• Journal article
  Soon YW, Cho H, Low J, Bronstein H, McCulloch I, Durrant JRet al., 2013,

  Correlating triplet yield, singlet oxygen generation and photochemical stability in polymer/fullerene blend films

  , Chemical Communications, Vol: 49, Pages: 1291-1293, ISSN: 1359-7345

  The photostability of two donor polymers, DPP-TT-T and PTB7, is compared in neat films and blend films with PC71BM. In both neat and blend films, PTB7 is shown to be relatively unstable. This observation is shown to correlate with transient optical studies of long lived polymer triplets and with molecular probe studies of singlet oxygen yields.

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• Journal article
  Donaghey JE, Sohn E-H, Ashraf RS, Anthopoulos TD, Watkins SE, Song K, Williams CK, McCulloch Iet al., 2013,

  Pyrroloindacenodithiophene polymers: the effect of molecular structure on OFET performance

  , POLYMER CHEMISTRY, Vol: 4, Pages: 3537-3544, ISSN: 1759-9954
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  • Citations: 23
• Journal article
  Miller NC, Cho E, Junk MJN, Gysel R, Risko C, Kim D, Sweetnam S, Miller CE, Richter LJ, Kline RJ, Heeney M, McCulloch I, Amassian A, Acevedo-Feliz D, Knox C, Hansen MR, Dudenko D, Chmelka BF, Toney MF, Bredas J-L, McGehee MDet 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
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  • Citations: 121
• Journal article
  Dimitrov SD, Bakulin AA, Nielsen CB, Schroeder BC, Du J, Bronstein H, McCulloch I, Friend RH, Durrant JRet al., 2012,

  On the Energetic Dependence of Charge Separation in Low-Band-Gap Polymer/Fullerene Blends

  , JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 134, Pages: 18189-18192, ISSN: 0002-7863
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  • Citations: 178
• Journal article
  Miller NC, Cho E, Gysel R, Risko C, Coropceanu V, Miller CE, Sweetnam S, Sellinger A, Heeney M, McCulloch I, Bredas J-L, Toney MF, McGehee MDet 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
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  • Citations: 95
• Journal article
  Schroeder BC, Ashraf RS, Thomas S, White AJ, Biniek L, Nielsen CB, Zhang W, Huang Z, Tuladhar PS, Watkins SE, Anthopoulos TD, Durrant JR, McCulloch Iet al., 2012,

  Synthesis of novel thieno[3,2-b]thienobis(silolothiophene) based low bandgap polymers for organic photovoltaics.

  , Chem Commun (Camb), Vol: 48, Pages: 7699-7701, ISSN: 1364-548X

  Thieno[3,2-b]thienobis(silolothiophene), a new electron rich hexacyclic monomer has been synthesized and incorporated into three novel donor-acceptor low-bandgap polymers. By carefully choosing the acceptor co-monomer, the energy levels of the polymers could be modulated and high power conversion efficiencies of 5.52% were reached in OPV devices.

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• Conference paper
  Schroeder BC, Bronstein HA, Ashraf RS, Zhang W, Huang Z, Tuladhar PS, Anthopoulos TD, Durrant JR, McCulloch Iet al., 2012,

  Electronic structure tuning of new fused thieno[3,2-b]thieno bisthiophene based polymers via alkyl chain and Group IV heteroatom modulation

  , SPIE Optics & Photonics
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• Journal article
  Keivanidis PE, Kamm V, Zhang W, Floudas G, Laquai F, McCulloch I, Bradley DDC, Nelson Jet al., 2012,

  Correlating Emissive Non-Geminate Charge Recombination with Photocurrent Generation Efficiency in Polymer/Perylene Diimide Organic Photovoltaic Blend Films

  , ADVANCED FUNCTIONAL MATERIALS, Vol: 22, Pages: 2318-2326, ISSN: 1616-301X
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  • Citations: 28
• Journal article
  Smith J, Zhang W, Sougrat R, Zhao K, Li R, Cha D, Amassian A, Heeney M, McCulloch I, Anthopoulos TDet 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
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  • Citations: 208
• Journal article
  Mcculloch I, Ashraf RS, Biniek L, Bronstein H, Combe C, Donaghey JE, James DI, Nielsen CB, Schroeder BC, Zhang Wet al., 2012,

  Design of Semiconducting Indacenodithiophene Polymers for High Performance Transistors and Solar Cells

  , ACCOUNTS OF CHEMICAL RESEARCH, Vol: 45, Pages: 714-722, ISSN: 0001-4842

  The prospect of using low cost, high throughput material deposition processes to fabricate organic circuitry and solar cells continues to drive research towards improving the performance of the semiconducting materials utilized in these devices. Conjugated aromatic polymers have emerged as a leading candidate semiconductor material class, due to their combination of their amenability to processing and reasonable electrical and optical performance. Challenges remain, however, to further improve the charge carrier mobility of the polymers for transistor applications and the power conversion efficiency for solar cells. This optimization requires a clear understanding of the relationship between molecular structure and both electronic properties and thin film morphology.In this Account, we describe an optimization process for a series of semiconducting polymers based on an electron rich indacenodithiophene aromatic backbone skeleton. We demonstrate the effect of bridging atoms, alkyl chain functionalization, and co-repeating units on the morphology, molecular orbital energy levels, charge carrier mobility, and solar cell efficiencies. This conjugated unit is extremely versatile with a coplanar aromatic ring structure, and the electron density can be manipulated by the choice of bridging group between the rings. The functionality of the bridging group also plays an important role in the polymer solubility, and out of plane aliphatic chains present in both the carbon and silicon bridge promote solubility. This particular polymer conformation, however, typically suppresses long range organization and crystallinity, which had been shown to strongly influence charge transport. In many cases, polymers exhibited both high solubility and excellent charge transport properties, even where there was no observable evidence of polymer crystallinity. The optical bandgap of the polymers can be tuned by the combination of the donating power of the bridging unit and the electron withdra

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