钝化
钙钛矿(结构)
哌啶
材料科学
晶界
结晶度
化学
化学工程
纳米技术
有机化学
图层(电子)
复合材料
微观结构
工程类
作者
Se-Phin Cho,Hyun‐Jung Lee,You‐Hyun Seo,Seok‐In Na
标识
DOI:10.1016/j.apsusc.2021.151740
摘要
Recently, the incorporation of passivation agents to reduce perovskite recombination has been proven to be one of the best approaches to achieving high-performance perovskite solar cells (PeSCs). Although several passivation compounds have been discovered, the mechanisms of passivation in diverse functional groups remain a mystery. In this work, we design bi-functional passivation agents, including methyl and carboxyl groups, as well as multi-functional passivation agent structures, including both methyl and carboxyl groups, and then we systematically study their passivation- and crystallinity control-abilities for PeSCs. Through electrostatic interactions with perovskite precursors, bi-functional passivation agents combined with piperidine ring and methyl (CH3) can passivate defects, and the carboxyl group (C = O) can increase the grain size and reduce the grain boundaries. Importantly, different functional groups, such as COCH3 groups comprising piperidine rings, CH3, and C = O, further improved the defect passivation effect. As the interaction between Pb2+ and COCH3 increased, the slow nuclear growth process of perovskite films introducing COCH3 increased the film quality and their charge extraction/collection capability, thus resulting in a PCE of 19.67%. In addition, the COCH3-based PesC's VOC and long-term stability are substantially enhanced.
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