Tunable thermotropic phase transition triggering large dielectric response and superionic conduction in lead halide perovskites

Dong Sheng Shao, Lei Sang, Ya Ru Kong, Zheng Rong Deng, Hong Bin Luo, Zheng Fang Tian, Xiao Ming Ren

科研成果: 期刊稿件文章同行评审

7 引用 (Scopus)

摘要

Lead halide perovskites have been demonstrated as multifunctional materials. Herein, we demonstrate the tunable thermotropic phase transitions and optical bandgap, together with large dielectric response and superionic conduction through mixed halogen anion modification in a family of bromide-iodide lead halide perovskites [Et3PrN][PbIxBr3−x] (Et3PrN+ = triethylpropylammonium and x = 0, 1.08, 1.83, 2.50 and 3; labeled as 1-5 sequentially). All members in this family are isomorphic at room temperature, crystallizing in the monoclinic space group P21/n or P21/c, and undergo a phase transition above 440 K. DSC revealed a phase transition that is relevant to the order-to-disorder transformations of globular-shaped cations. Significantly, the lead halide perovskites exhibit superionic conduction beyond 10−3 S cm−1 in the high-temperature (HT) phase. This study provides an efficient strategy for design of multifunctional lead halide perovskites.

源语言英语
页(从-至)5653-5662
页数10
期刊Inorganic Chemistry Frontiers
9
21
DOI
出版状态已出版 - 8 9月 2022

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