We report that the organometal halide perovskite is selectively damaged by an electron beam depending on its irradiation direction. Using transmission electron microscopy investigation, we have confirmed that CH 3 NH 3 PbI 3 single crystals are highly tolerant to [ ##IMG## [http://ej.iop.org/images/1882-0786/13/9/091001/apexababeeieqn1.gif] {$\bar{1}1\bar{1}$} ] electron beam irradiation while they are easily damaged by [ ##IMG## [http://ej.iop.org/images/1882-0786/13/9/091001/apexababeeieqn2.gif] {$00\bar{1}$} ] electron irradiation. We have shown that the direction selectivity of the electron beam damage through the decomposition of the organic components in CH 3 NH 3 PbI 3 crystals is consistent with the crystallographic arrangement of organic and iodide ions in the crystal.

中文翻译：

---

基于晶体各向异性的方向选择性电子束对CH 3 NH 3 PbI 3的损伤

我们报告说，有机金属卤化物钙钛矿受电子束的选择性照射，具体取决于其照射方向。使用透射电子显微镜调查，我们已经确认CH 3 NH 3 PbI 3单晶对[## IMG ## [http://ej.iop.org/images/1882-0786/13/9/091001 /apexababeeieqn1.gif] {$ \ bar {1} 1 \ bar {1} $}电子束辐照，而它们很容易受到[## IMG ## [http://ej.iop.org/images/1882 -0786 / 13/9/091001 / apexababeeieqn2.gif] {$ 00 \ bar {1} $}]电子辐照。我们已经表明，通过CH 3 NH 3 PbI 3晶体中有机成分的分解，电子束损坏的方向选择性与晶体中有机和碘离子的晶体排列相一致。