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Impact of dithienyl or thienothiophene units on the optoelectronic and photovoltaic properties of benzo[1,2,5]thiadiazole based donor–acceptor copolymers for organic solar cell devices

DOI: 10.1039/C4RA07186G DOI Help

Authors: Andrew Pearson (Department of Physics & Astronomy, University of Sheffield, Sheffield, UK) , Darren Watters (Department of Physics & Astronomy, University of Sheffield, Sheffield, UK) , Hunan Yi (Department of Chemistry, University of Sheffield, Sheffield, UK) , Mohd S. Sarjadi (Department of Chemistry, University of Sheffield, Sheffield, UK) , Luke X. Reynolds (Centre for Plastic Electronics and Department of Chemistry, Imperial College London, U.K.) , Pier P. Marchisio (Ossila Ltd., Sheffield, U.K.) , James Kingsley (Ossila Ltd., Sheffield, U.K.) , Saif A. Haque (Centre for Plastic Electronics and Department of Chemistry, Imperial College London, U.K.) , Ahmed Iraqi (Department of Chemistry, University of Sheffield, Sheffield, UK) , David Lidzey (Department of Physics & Astronomy, University of Sheffield, Sheffield, UK)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Rsc Advances , VOL 4 (81) , PAGES 43142 - 43149

State: Published (Approved)
Published: August 2014
Diamond Proposal Number(s): 8117 , 9281

Abstract: We report a comparative study on four donor–acceptor benzothiadiazole-based copolymers containing dithienyl or thienothiophene moieties for application in organic photovoltaic (OPV) devices. Bulk-heterojunction OPV devices are fabricated having power conversion efficiencies ranging between 4 and 6%. Morphological, spectroscopic and charge-transport measurements are used to investigate the influence of either the dithienyl or thienothiophene moieties on the structure and photophysical properties of the copolymer and copolymer:PC71BM blend films and rationalise the solar cell characteristics. Although all copolymer:PC71BM blends exhibit comparable hole polaron yields, solar cell devices with the highest power conversion efficiencies are correlated with increased charge-carrier mobility of the copolymer and enhanced aggregation of PC71BM in the blend.

Subject Areas: Energy, Chemistry, Materials


Instruments: I07-Surface & interface diffraction

Added On: 26/09/2014 17:50

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