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Open AccessArticle

Structural Damage of Two-Dimensional Organic–Inorganic Halide Perovskites

1
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
2
Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA
*
Author to whom correspondence should be addressed.
Inorganics 2020, 8(2), 13; https://doi.org/10.3390/inorganics8020013
Received: 31 December 2019 / Revised: 21 January 2020 / Accepted: 25 January 2020 / Published: 6 February 2020
(This article belongs to the Special Issue Inorganic Materials for Solar Energy Conversion)
Organic–inorganic halide perovskites are promising photovoltaic materials with excellent optoelectronic properties. However, the extreme structural instability hinders their wide application as well as the microstructure characterization using high energy beams such as transmission electron microscopy (TEM). Here, taking BA2FAPb2I7 and BA2MAPb2I7 as examples, we investigate their structural evolution resulting from high energy electron irradiation, moist air, and low temperature, respectively. The results show that the long organic chains are the first to be damaged under electron beam, which is mainly arising from their instability and weak bonding with the framework of [PbI6]4− octahedrons. Then the short organic cations and the framework of [PbI6]4− octahedrons collapses gradually. The final products are clusters of detached PbI2 particles, which can also be observed in the sample degraded in moist air. In addition, the structures of BA2FAPb2I7 and BA2MAPb2I7 are discovered to undergo a phase transformation at liquid nitrogen temperature, which calls attention to the community that cryo-TEM methods should be used cautiously for organic–inorganic halide perovskite materials.
Keywords: halide perovskite; organic–inorganic; electron irradiation; structural damage halide perovskite; organic–inorganic; electron irradiation; structural damage
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MDPI and ACS Style

Yuan, B.; Shi, E.; Liang, C.; Dou, L.; Yu, Y. Structural Damage of Two-Dimensional Organic–Inorganic Halide Perovskites. Inorganics 2020, 8, 13.

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