Multifunctional additives are widely used to improve crystallization and to passivate defects in per-ovskite solar cells.The roles of these additives are usually related to the various functional groups con-tained 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 per-ovskites 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 interac-tions 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.

Wenhao Zhang;Jiankang Du;Weihua Zhang;Yanmeng Chu;Anyi Mei;Yaoguang Rong;Xinyu Gao;Hongwei Han;Yue Hu

Michael Gr?tzel Center for Mesoscopic Solar Cells,Wuhan National Laboratory for Optoelectronics,Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;Shanghai Synchrotron Radiation Facility(SSRF),Chinese Academy of Sciences,Shanghai 201204,China

能源化学

[1]Wenhao Zhang;Jiankang Du;Weihua Zhang;Yanmeng Chu;Anyi Mei;Yaoguang Rong;Xinyu Gao;Hongwei Han;Yue Hu-.Unveiling the effect of amino acids on the crystallization pathways of methylammonium lead iodide perovskites)[J].能源化学,2022(06):253-260

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