Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 22, Pages 8416-8419Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja2037673
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Funding
- NSF [DMR 0606414]
- U.S. Army General Technical Services [LLC/GTS-S-09-1-196]
- Department of Energy [DOE ER46535]
- Direct For Mathematical & Physical Scien [1005546, 0843934] Funding Source: National Science Foundation
- Division Of Materials Research [1005546, 0843934] Funding Source: National Science Foundation
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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 (PC71BM) 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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