Phase segregation in inorganic mixed-halide perovskites: from phenomena to mechanisms

Yutao Wang, Xavier Quintana, Jiyun Kim, Xinwei Guan, Long Hu, Chun-Ho Lin, Brendon Tyler Jones, Weijian Chen, Xiaoming Wen, Hanwei Gao, Tom Wu

Research output: Contribution to journalReview articlepeer-review

23 Citations (Scopus)


Halide perovskites, such as methylammonium lead halide perovskites (MAPbX3, X = I, Br, and Cl), are emerging as promising candidates for a wide range of optoelectronic applications, including solar cells, light-emitting diodes, and photodetectors, due to their superior optoelectronic properties. All-inorganic lead halide perovskites CsPbX3 are attracting a lot of attention because replacing the organic cations with Cs+ enhances the stability, and its halide-mixing derivatives offer broad bandgap tunability covering nearly the entire visible spectrum. However, there is evidence suggesting that the optical properties of mixed-halide perovskites are influenced by phase segregation under external stimuli, especially illumination, which may negatively impact the performance of optoelectronic devices. It is reported that the mixed-halide perovskites in forms of thin films and nanocrystals are segregated into a low-bandgap I-rich phase and a high-bandgap Br-rich phase. Herein, we present a critical review on the synthesis and basic properties of all-inorganic perovskites, phase-segregation phenomena, plausible mechanisms, and methods to mitigate phase segregation, providing insights on advancing mixed-halide perovskite optoelectronics with reliable performance.

Original languageEnglish
Pages (from-to)A56-A71
Number of pages16
JournalPhotonics Research
Issue number11
Publication statusPublished - Nov 2020
Externally publishedYes


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