极化子
激发态
激子
有机太阳能电池
化学物理
超快激光光谱学
皮秒
接受者
电子供体
材料科学
电子受体
电子
共轭体系
化学
光化学
光谱学
凝聚态物理
聚合物
物理
原子物理学
光学
催化作用
激光器
复合材料
生物化学
量子力学
作者
Kang Wang,Honggang Chen,Shuangyuan Li,Jinzhong Zhang,Yingping Zou,Ye Yang
标识
DOI:10.1021/acs.jpcb.1c03989
摘要
Recently, rapid progress in the power conversion efficiency for organic solar cells (OSCs) is achieved due to the phenomenal development of the nonfullerene electron acceptors. In addition to the pairing electron donors, conjugated donor–acceptor copolymers are another key player in the high-efficiency OSCs. Here, the temporal evolution of excited states in a typical copolymer, PM6, was traced by transient absorption spectroscopy. The spectroscopic result implies the formation of two kinetically correlated intrachain species, polaron excitons and intrachain polaron pairs. In the presence of the interchain interaction, these intrachain species quickly convert into interchain polaron pairs on a time scale of few picoseconds. Our findings reveal that the electron transfer mechanisms in PM6-based OSCs substantially depend on the PM6 environment in the bulk heterojunction blends.
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