结晶
成核
结晶度
碘化物
钝化
钙钛矿(结构)
氨基酸
材料科学
化学
相(物质)
化学工程
无机化学
结晶学
有机化学
生物化学
工程类
图层(电子)
作者
Jiankang Du,Weihua Zhang,Yanmeng Chu,Anyi Mei,Yaoguang Rong,Xingyu Gao,Yue Hu,Hongwei Han
标识
DOI:10.1016/j.jechem.2021.12.048
摘要
Multifunctional additives are widely used to improve crystallization and to passivate defects in perovskite solar cells. The roles of these additives are usually related to the various functional groups contained in such additives. Here, we introduce a serious of analogues of amino acids into methylammonium lead iodide perovskites and find they play different roles in the crystallization process despite the fact that these additives share exactly the same terminal groups, namely one amino group and one carboxyl group. The corresponding crystallization pathways are established for the first time via monitoring the time-resolved phase formation and transformation. We find that avoiding the rapid formation of perovskites from precursor solution can facilitate the uniform nucleation and growth of perovskite crystals with enhanced crystallinity and reduced defects. Further, we find the different crystallization behaviors probably arise from the inherent structural characteristic of these additives, leading to different interactions in the precursors. This study unveils the effects of amino acids on the liquid–solid crystallization process and helps better understand the role of multifunctional additives beyond their functional groups.
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