0D–3D mixed-dimensional perovskite Cs4Pb(BrCl)6–CsPbBr2−xCl1+x films for stable and sensitive self-powered, high-temperature photodetectors

Abstract

Photodetectors with excellent high-temperature performance and facile fabrication are desirable for harsh environment applications. Herein, we report high-temperature, self-powered PDs by adopting 0D–3D mixed-dimensional perovskite Cs₄Pb(BrCl)₆–CsPbBr_2−xCl_1+x films and simple carbon-electrode device configuration. Cs₄Pb(BrCl)₆–CsPbBr_2−xCl_1+x films are prepared through the water-based two-step spin-coating method, wherein the CsCl additive strategy for the PbBr₂ precursor film is proposed and it is vital to the target film formation. Based on the optimized Cs₄Pb(BrCl)₆–CsPbBr_2−xCl_1+x film, the self-powered, carbon-electrode PD with outstanding photodetection performance is obtained. It yields a responsivity (R) peak of 0.18 A W⁻¹, a specific detectivity (D*) of 1.65 × 10¹³ Jones, and a response time of 1.23 μs. Moreover, 0D perovskite Cs₄Pb(BrCl)₆ can suppress the cubic to tetragonal phase transition of 3D perovskite CsPbBr_2−xCl_1+x, and thus the resulting PD can work effectively at ∼300 °C, for which a dark current density of 6.34 × 10⁻⁸ A cm⁻², an on/off ratio of over 1.44 × 10⁵, and a stable working duration of ∼300 min are achieved, indicating its excellent tolerance to high temperature and ideal compatibility for practical applications.