材料科学
离域电子
接受者
有机太阳能电池
光伏系统
分子间力
活动层
化学物理
聚合物太阳能电池
带隙
光电子学
能量转换效率
光化学
超快激光光谱学
光谱学
纳米技术
聚合物
有机化学
图层(电子)
分子
复合材料
凝聚态物理
化学
物理
薄膜晶体管
生物
量子力学
生态学
作者
Shuyan Liang,Siying Li,Yannan Zhang,Tao Li,Haoxiang Zhou,Feng Jin,Chuanxiang Sheng,Gang Ni,Jianyu Yuan,Wanli Ma,Haibin Zhao
标识
DOI:10.1002/adfm.202102764
摘要
Abstract Organic solar cells (OSCs) based on small molecular acceptors (SMAs) have made great development with a power conversion efficiency (PCE) over 16% due to the design of novel materials and advances in device preparation technology. This work fabricates two bulk‐heterojunction photovoltaic devices containing the same wide‐bandgap donor PM6, respectively, matched with popular Y6 and ITIC SMAs. The PM6:Y6‐based device achieves a much higher PCE of 15.21% than the PM6:ITIC‐based device of 9.02%. On the basis of comparisons of macroscopic performances in the quasistatic regime, transient absorption spectroscopy (TAS) is further performed to better understand the microscopic dynamics difference in charge separation processes between the two photovoltaic blends. According to the TAS results, the calculated hole transfer efficiency in PM6:Y6 is 71.4%, far greater than the efficiency of 13.1% in PM6:ITIC, demonstrating favorable charge separation at donor/acceptor interfaces via hole transfer channel in PM6:Y6. The favorable hole transfer in PM6:Y6 is accounted for by its better mutual miscibility between the donor and acceptor, and the formation of long‐lived delocalized intramoiety excimer state in the acceptor. These results highlight the important role of proper molecular design strategy with strong intermolecular coupling and beneficial film morphology on facilitating charge generation in OSCs adopting SMAs.
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