论文标题
由氩离子束抛光的金属 - 大壁钙壶的地下特征
Subsurface Characteristics of Metal-Halide Perovskites Polished by Argon Ion Beam
论文作者
论文摘要
聚焦离子束（FIB）技术经常用于将金属甲基钙钛矿截面以进行微结构研究。然而，直接辐照样品表面的离子束可能会改变与原始的特性，这可能会导致衰老应激源下变化的恶化机制。在这里，我们结合了互补方法来测量抛光钙钛矿的地下特征，并确定负责测量特性的化学物种。对实验结果与蒙特卡洛模拟结合的分析表明，通过玻璃AR+梁照射（15 nm by 4 kV，3度），原子位移和局部加热发生在甲基铵铅碘化物（MAPBI3）的地下发生。富含铅的碘缺陷表面可在热衰老条件下促进快速相分离。另一方面，尽管进行了地下修改，但我们的实验证实了其余的Mapbi3散装保留材料完整性。我们的观察结果支持，抛光的钙棍可以在研究散装或埋葬的连接处的特性方面，远离改变的地下。
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.
