激子
接受者
光伏系统
载流子
结合能
化学物理
材料科学
光伏
混合太阳能电池
离解(化学)
有机太阳能电池
极化(电化学)
光电子学
纳米技术
化学
聚合物太阳能电池
太阳能电池
原子物理学
凝聚态物理
物理化学
物理
聚合物
电气工程
复合材料
工程类
作者
Lingyun Zhu,Zhixiang Wei,Yuanping Yi
标识
DOI:10.1021/acs.jpcc.1c08898
摘要
Exciton binding energy (Eb) plays an essential role in organic electronics. For organic solar cells, the existence of Eb necessitates interfacial energy level offsets to drive exciton dissociation into free charge carriers at the donor/acceptor interfaces, which results in an extra energy loss with respect to inorganic and perovskite solar cells. Thus, it is highly desirable to reduce the Eb for improving the performance of organic photovoltaics. In this perspective, we summarize our recent advances on theoretical studies of the Eb in A–D–A small-molecule acceptors for organic photovoltaics. We highlight the importance of the polarization effect on decreasing the Eb by stabilizing charge carriers. Moreover, the polarization energies of charge carriers are found to be greatly influenced by different molecular packing structures. Remarkably, an extremely weak Eb is achieved in the state-of-the-art A–D–A acceptor of Y6 with a three-dimensional compact molecular packing, thus enabling direct photogeneration of free charge carriers even without the assistance of the donor/acceptor interfaces. We hope this perspective would be helpful to decrease the Eb and energy loss for high-efficiency organic solar cells.
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