期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 22, 页码 12163-12167出版社
AMER CHEMICAL SOC
DOI: 10.1021/am404157t
关键词
polymer solar cells; efficiency; molecular weight; light absorption; charge carrier mobility; phase separation
资金
- 3M Company
- NSFC [51329301]
In this study, we report the investigation of the influence of molecular weight (MW) on power conversion efficiency (PCE) of bulk heterojunction (BHJ) polymer solar cells (PSCs). It was found that PCEs of PSCs fabricated by poly[ [4,8-bis [ (2-ethylhexyl)oxy]benzo [ 1,2-b:4,5-b dithiophene-2,6-diy1] [3-fluoro-2- [(2-ethylhexyl)carbonyl] thieno [3,4-b]thiophenediy1] (PTB7) blended with [6,6]-phenyl-C71 butyric acid methyl ester (PC7IBM) as the active layer, are significantly enhanced from 5.41 to 6.27 and 8.50% along with the MW of PTB7 increased from 18 to 40 and 128 kg/mol, respectively. This enhancement is attributed to the enhanced light absorption and increased charge carrier mobility of PTB7 with high MW, and a proper phase separation in BHJ composite of PTB7:PC71BM interpenetrating network. All these results demonstrate that the MW of donor polymer plays an important role in the performance of BHJ PSCs.
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