两步蒸镀法制备高质量(CH3NH3)3Bi2I9钙钛矿薄膜
High-Quality (CH3NH3)3Bi2I9 Perovskite Thin Films Prepared by a Two-Step Evaporation Route
DOI: 10.12677/MS.2019.92015, PDF,  被引量    科研立项经费支持
作者: 李晓伟, 黄忠兵：湖北大学，物理与电子科学学院，湖北 武汉；刘艳领, K. P. Homewood, 高 云, 雷丙龙：湖北大学，材料科学与工程学院，湖北 武汉
关键词: 薄膜；铋基钙钛矿；蒸镀；氯；掺杂；Films； Bismuth Perovskite； Evaporation； Chlorine； Doping
摘要: (CH3NH3)3Bi2I9 (MBI)钙钛矿属于六方晶系，在薄膜制备时，晶体颗粒具有c轴优先生长的特性，因而很难获得平整均一的高质量薄膜。在前期研究的基础上，我们通过两步蒸镀法得到了致密无针孔的薄膜。该薄膜的可重复性不够理想，有时仍有一定量的六方片状晶粒出现，显著降低了薄膜的质量。在此基础上，我们通过引入氯元素，从根本上抑制了MBI薄膜的c轴优先生长，制备出具有良好重复性、光滑平整且晶粒尺寸较大的高质量MBI薄膜。
Abstract: The (CH3NH3)3Bi2I9 (MBI) perovskite belongs to the hexagonal crystal system and it has inclination to crystallize along the c axis. Therefore it is usually difficult to get uniform films. Herein we adopted a two-step evaporation method and successfully obtained fully-covered enhanced MBI films without any pinholes. However, poor repeatability is encountered and sometimes films still encompass some flaked hexagonal crystals. Accordingly, further modification by chlorine doping was adopted, which has proved to be able to fundamentally inhibit the preferential c-axis growth and hence makes the MBI films prepared with much improved smoothness, large and uniform grains, and also with high repeatability.
文章引用：李晓伟, 刘艳领, K. P.Homewood, 黄忠兵, 高云, 雷丙龙. 两步蒸镀法制备高质量(CH3NH3)3Bi2I9钙钛矿薄膜[J]. 材料科学, 2019, 9(2): 115-126. https://doi.org/10.12677/MS.2019.92015

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