Enhance performance of organic solar cells based on an isoindigo-based copolymer by balancing absorption and miscibility of electron acceptor
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2011
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Ma, Z.
Wang, E.
Vandewal, K.
Andersson, M.R.
Zhang, F.
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Applied Physics Letters, 2011; 99(14, article no. 143302):1-3
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Superior absorption of PC71BM in visible region to that of PC61BM makes PC71BM a predominant acceptor for most high efficient polymer solar cells (PSCs). However, we will demonstrate that power conversion efficiencies (PCEs) of PSCs based on poly[N,N0-bis(2-hexyldecyl)isoindigo-6, 60-diyl-alt-thiophene-2,5-diyl] (PTI-1) with PC61BM as acceptor are 50% higher than their PC71BM counterparts under illumination of AM1.5G. AFM images reveal different topographies of the blends between PTI-1:PC61BM and PTI-1:PC71BM, which suggests that acceptor’s miscibility plays a more important role than absorption. The photocurrent of 9.1 mA/cm2 is among the highest value in PSCs with a driving force for exciton dissociation less than 0.2 eV.
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Copyright 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.