Imperial College London
Alternate

ProfessorIainMcCulloch

Faculty of Natural Sciences, Department of Chemistry

Visiting Professor
 
 
 
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Contact

 

+44 (0)20 7594 5669i.mcculloch

 
 
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Location

 

Molecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Publication Type
Year
to

637 results found

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

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.

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

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

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.

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

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

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

Journal article

McCulloch I, 2013, Organic Electronics, ADVANCED MATERIALS, Vol: 25, Pages: 1811-1812, ISSN: 0935-9648

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

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

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

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

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

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

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

Journal article

Medeiros MCR, Martinez-Domingo C, Ramon E, Negrier AT, Sowade E, Mitra KY, Baumann RR, McCulloch I, Carrabina J, Gomes HLet al., 2013, Inkjet-printed organic electronics: Operational stability and reliability issues, Pages: 1-10, ISSN: 1938-5862

The operational stability of all-inkjet printed transistors is reported. At room temperature the threshold voltage shifts following a stretched exponential with a relaxation time τ=1×103 s. Two distinct trap sites active in different temperature ranges, one at 200-250 K and other above 310 K cause the electrical instability. Both types of traps capture holes and can be fast neutralized by photogenerated electrons. Optically induced detrapping currents confirm the differences in trap signature. It is proposed, that the traps have a common physical origin related to water. © The Electrochemical Society.

Conference paper

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

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.

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

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

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

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

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

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

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

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.

Journal article

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

Conference paper

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

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

Journal article

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