碘化物
卤化物
亚稳态
化学物理
相(物质)
钙钛矿(结构)
材料科学
结晶学
光化学
共焦激光扫描显微镜
化学
无机化学
生物物理学
生物
有机化学
作者
David O. Tiede,Mauricio E. Calvo,Juan F. Galisteo‐López,Hernán Míguez
标识
DOI:10.1021/acs.jpclett.0c01127
摘要
Mixed-halide perovskites represent a particularly relevant case within the family of lead-halide perovskites. Beyond their technological relevance for a variety of optoelectronic devices, photoinduced structural changes characteristic of this type of material lead to extreme photophysical changes that are currently the subject of intense debate. Herein we show that the conspicuous photoinduced phase segregation characteristic of these materials is primarily the result of the local and metastable rearrangement of the iodide sublattice. A local photophysical study comprising spectrally resolved laser scanning confocal microscopy is employed to find a correlation between the defect density and the dynamics of photoinduced changes, which extend far from the illuminated region. We observe that iodide-rich regions evolve much faster from highly defective regions. Also, by altering the material composition, we find evidence for the interplay between the iodide-related defect distribution and the intra- and interdomain migration dynamics giving rise to the complexity of this process.
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