Improved High-Efficiency Organic Solar Cells via Incorporation of a Conjugated Polyelectrolyte Interlayer

Jung Hwa Seo(University of California, Santa Barbara), Andrea Gutacker(University of Wuppertal), Yanming Sun(University of California, Santa Barbara), Hongbin Wu(South China University of Technology), Fei Huang(South China University of Technology), Yong Cao(South China University of Technology), Ullrich Scherf(University of Wuppertal), Alan J. Heeger(University of California, Santa Barbara), Guillermo C. Bazan(University of California, Santa Barbara)
Journal of the American Chemical Society
May 10, 2011
10.1021/ja2037673
Cited by 558

Abstract

The power conversion efficiencies of bulk heterojunction (BHJ) solar cells can be increased from 5 to 6.5% by incorporating an ultrathin conjugated polyelectrolyte (CPE) layer between the active layer and the metal cathode. Poly[N-9''-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)] (PCDTBT) and [6,6]-phenyl C(71) butyric acid methyl ester (PC(71)BM) were chosen for the photoactive layer. CPEs with cationic polythiophenes, in both homopolymer and block copolymer configurations, were used to improve the electronic characteristics. The significant improvement in device performance and the simplicity of fabrication by solution processing suggest a promising and practical pathway for improving polymer solar cells with high efficiencies.

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