卤化物
钙钛矿(结构)
辐照
材料科学
离子束
金属
相(物质)
梁(结构)
碘化物
离子
化学物理
聚焦离子束
矿物学
化学
无机化学
光学
冶金
结晶学
有机化学
核物理学
物理
作者
Yu-Lin Hsu,Chongwen Li,Andrew C. Jones,Michael T. Pettes,Ashif Chowdhury,Yanfa Yan,Heayoung P. Yoon
标识
DOI:10.1021/acs.jpcc.2c09122
摘要
Focused ion beam (FIB) techniques have been frequently used to section metal-halide perovskites for microstructural investigations. However, the ion beams directly irradiated to the sample surface may alter the properties far different from pristine, potentially leading to modified deterioration mechanisms under aging stressors. Here, we combine complementary approaches to measure the subsurface characteristics of polished perovskite and identify the chemical species responsible for the measured properties. Analysis of the experimental results in conjunction with Monte Carlo simulations indicates that atomic displacements and local heating occur in the subsurface of methylammonium lead iodide (MAPbI3) by glazing Ar+ beam irradiation (15 nm by 4 kV at 3 degree). The lead-rich, iodine-deficient surface promotes rapid phase segregation under thermal aging conditions. On the other hand, despite the subsurface modification, our experiments confirm the rest of the MAPbI3 bulk retains the material integrity. Our observation supports that polished perovskites could serve in studying the properties of bulk or buried junctions far away from the altered subsurface with care.
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