We present the first report of a water-regulated method for obtaining cubic-phase CsPbBr₃ single crystal which could be frozen at low-temperature with CsBr/PbBr₂ ratio of 1:1. Cubic CsPbBr₃ single-crystal photodetector exhibits superior responsivity of 278 A W^–1, EQE of 6.63×10⁴%, and ultrahigh detectivity of 4.36×10¹³ Jones under low-power 520 nm irradiation at 3 V.

Xiangfeng Wei#, Han Liu#,Zhixiang Zhang, Wenchao Xu, Wenjun Huang, Lin-Bao Luo*, and Jiehua Liu*.  Low-temperature architecture of cubic-phase CsPbBr3 single crystal for ultrasensitive weak-light photodetector. Chemical Communications, 2021,  DOI: 10.1039/D1CC03460J.

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