Unraveling the colloidal composition of perovskite precursor solutions and its impact on film formation  

揭示钙钛矿前驱体溶液的胶体组成及其对成膜的影响

作　　者：Tiantian Lou Letian Chen Guichun Yang Peng Chen Wenyan Zhao Hongshi Li Guoran Li 娄甜甜;陈乐添;杨桂春;陈鹏;赵文燕;李红时;李国然(School of Materials Science and Engineering,Institute of New Energy Material Chemistry,Renewable Energy Conversion and Storage Center,Nankai University,Tianjin 300350,China;School of Mechanical and Electronic Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,China)

机构地区：[1]School of Materials Science and Engineering,Institute of New Energy Material Chemistry,Renewable Energy Conversion and Storage Center,Nankai University,Tianjin 300350,China [2]School of Mechanical and Electronic Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,China

出　　处：《Science China Materials》2025年第1期156-164,共9页中国科学(材料科学)(英文版)

基　　金：National Natural Science Foundation of China (52102267, 22209079 and 52162028)。

摘　　要：Colloids are a vital component of perovskite precursor solutions(PPSs),significantly influencing the quality of perovskite film formation.Despite their importance,a comprehensive understanding of these colloids remains elusive.In this work,we explored the colloidal compositions of two distinct PPS types:the monomer-mixing dissolution(MMD)and the pre-synthesized perovskite single crystal redissolution(SCR).We have uncovered a new dissolution chemical equilibrium mechanism where the transition from mixed monomers to the 3C cubic phase(α-phase)involves a reversible transformation.Our findings indicate that although colloidal size significantly affects the nucleation during perovskite crystallization,the composition of the colloids plays a more crucial role.The MMD method yields poly Pb-I·solvent clusters while the colloids derived from the SCR approach produce hexagonal lead-halide-based perovskite phase clusters.These divergent colloidal compositions lead to markedly different impacts on the perovskite film formation process.Notably,hexagonal-phase colloids act as favorable nucleation sites,promoting the generation of theα-phase perovskite films with larger grains,more homogeneous phases,and fewer defects.This work demonstrates the importance of tailoring colloidal compositions and provides theoretical insights into the beneficial effects of redissolving perovskite in forms such as powder,microcrystals,and single crystals.胶体是钙钛矿前驱体溶液的重要组成部分,对钙钛矿的成膜质量有重大影响.在这项工作中,我们探索了两种不同类型前驱体的胶体成分:原料单体混合溶解(MMD)和预合成的钙钛矿单晶再溶解(SCR).我们发现了一种新的溶解化学平衡机制,即从混合单体到3C立方相(α相)的转变涉及一个可逆的转变过程. MMD的方法产生了多聚Pb-I溶剂化胶束,而SCR方法产生的则是六方卤化铅基的钙钛矿胶体,这种胶体组成的差别显著影响了成膜质量.值得注意的是,六方相胶体是有利的成核位点,可促进形成晶粒更大、相更均匀、缺陷更少的α相钙钛矿薄膜.这项工作证明了调控胶体成分的重要性,并从理论上深入探讨了以粉末、微晶和单晶等形式重新溶解钙钛矿的有利影响.

关 键 词：perovskite precursor solutions COLLOIDS hexagonalphase colloids poly Pb-I·solvent clusters perovskite solar cells 

分 类 号：TB34[一般工业技术—材料科学与工程]