Nanoscale Phase Separation-Induced Suppression of Geminate Recombination in Low Bandgap Polymer-Fullerene Solar Cells

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2014,（5）
• 页码范围: 195-198
• 页数: 4页
• 语种: 中文
• DOI: 10.1088/0256-307X/31/5/058801

摘要

The short-circuit current of polymer solar cells based on a PCPDTBT:PC71 BM blend is substantially increased by using a processing additive.It is found that the significant geminate recombination in the PCPDTBT:PC71BM blend film is dramatically suppressed by using a processing additive which can produce a nanoscale PCPDTBT and PCT1BM phase separation.The processing additive-induced aggregation of PCPDTBT polymer chains and PC71BM molecules can give rise to a driving force for the separation of charge-transfer states at the donor/acceptor interfaces into the free charge carriers and thus geminate recombination is suppressed.