摘要
Organic-inorganic hybrid perovskites are promising candidates for the next-generation solar cells. Many efforts have been made to study their structures in the search for a better mechanistic understanding to guide the materials optimization. Here, we investigate the structure instability of the single-crystalline CH(3)NH(3)Pbl(3) (MAPbl(3)) film by using transmission electron microscopy. We find that MAPbl(3) is very sensitive to the electron beam illumination and rapidly decomposes into the hexagonal Pbl(2). We propose a decomposition pathway, initiated with the loss of iodine ions, resulting in eventual collapse of perovskite structure and its decomposition into Pbl(2). These findings impose important question on the interpretation of experimental data based on electron diffraction and highlight the need to circumvent material decomposition in future electron microscopy studies. The structural evolution during decomposition process also sheds light on the structure instability of organic-inorganic hybrid perovskites in solar cell applications.
- 出版日期2018-11-15
- 单位先进焊接与连接国家重点实验室; 哈尔滨工业大学; 南方科技大学; 北京大学; 中国科学院深圳先进技术研究院