Wang Yang, Zhang Zemin, Tao Mingquan, Lan Yangjie, Li Mingzhu, Tian Yang, Song Yanlin
Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
Nanoscale. 2020 Sep 28;12(36):18563-18575. doi: 10.1039/d0nr05136e. Epub 2020 Sep 7.
Organic-inorganic perovskite solar cells (PSCs) have attracted tremendous attention due to their high absorption coefficient, high carrier mobility, long diffusion length, and tunable direct bandgap, and their excellent efficiency was boosted to a certified 25.2% efficiency in 2019. However, due to the presence of a high-density of charge traps in perovskite films, plenty of charge recombination occurs at grain boundaries and defects caused by precursor compositions, the process of preparation and crystal growth, thereby restricting the power conversion efficiency (PCE). At present, interfacial modifications by using additives play an important role in various breakthroughs of PSCs. Herein, the effects of various additives with the main types of functional groups, length and spatial configuration of molecules on interfacial modifications in PSCs are reviewed, and their influences on perovskite crystallization and film formation, defect passivation in the bulk and/or at the surface, stabilities of PSCs, and adjusting the interface of structures and energy levels for device performances are also described and summarized. Finally, an outlook of interfacial modifications is provided on the selection and design of efficient additives with respect to the fabrication and development of highly efficient and stable PSCs.
有机-无机钙钛矿太阳能电池（PSCs）因其高吸收系数、高载流子迁移率、长扩散长度和可调节的直接带隙而备受关注，其优异的效率在2019年提高到了经认证的25.2%。然而，由于钙钛矿薄膜中存在高密度的电荷陷阱，在前体组成、制备和晶体生长过程中产生的大量电荷复合发生在晶界和缺陷处，从而限制了功率转换效率（PCE）。目前，使用添加剂进行界面修饰在PSCs的各种突破中发挥着重要作用。在此，综述了具有主要官能团类型、分子长度和空间构型的各种添加剂对PSCs界面修饰的影响，并描述和总结了它们对钙钛矿结晶和成膜、体相和/或表面的缺陷钝化、PSCs的稳定性以及调节结构和能级界面以实现器件性能的影响。最后，针对高效稳定PSCs的制备和发展，对高效添加剂的选择和设计提供了界面修饰的展望。
