论文标题
高分辨率TEM表征钙钛矿材料的警报
Alerts in High-resolution TEM characterization of perovskite material
论文作者
论文摘要
高分辨率TEM（HRTEM）是结构表征的强大工具。然而，碘化甲基丙二胺（MAPBI3）钙钛矿对电子束高度敏感，并且很容易分解为碘化铅（PBI2）。 HRTEM表征中广泛存在PBI2错误标记为钙钛矿的普遍误解，这将对钙钛矿研究领域的发展产生负面影响。在这里，基于相应的电子衍射（ED）模拟，对Mapbi3钙钛矿校准中的误认识进行了概括，分类和纠正。还清楚地介绍了内在四方MAPBI3和可混淆的六角形PBI2的相应晶体学参数。最后，提供了适当的相位识别方法和一些控制HRTEM中辐射损害的方法。这项工作铺平了避免钙钛矿和其他电子束敏感材料的HRTEM表征中的误导性的方法。
High-resolution TEM (HRTEM) is a powerful tool for structure characterization. However, methylammonium lead iodide (MAPbI3) perovskite is highly sensitive to electron beams and easily decompose into lead iodide (PbI2). Universal misidentifications that PbI2 is incorrectly labeled as perovskite are widely exist in HRTEM characterization, which would negatively affect the development of perovskite research field. Here misidentifications in MAPbI3 perovskite calibration are summarized, classified and corrected based on corresponding electron diffraction (ED) simulations. Corresponding crystallographic parameters of intrinsic tetragonal MAPbI3 and the confusable hexagonal PbI2 are also presented clearly. Finally, the method of proper phase identification and some ways to control the radiation damage in HRTEM are provided. This work paves the way to avoid misleadings in HRTEM characterization of perovskite and other electron beam-sensitive materials in the future.
