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

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)-CsPbBr2-xCl1+x films and simple carbon-electrode device configuration. Cs4Pb(BrCl)(6)-CsPbBr2-xCl1+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)-CsPbBr2-xCl1+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 x 10(13) Jones, and a response time of 1.23 mu s. Moreover, 0D perovskite Cs4Pb(BrCl)(6) can suppress the cubic to tetragonal phase transition of 3D perovskite CsPbBr2-xCl1+x, and thus the resulting PD can work effectively at similar to 300 degrees C, for which a dark current density of 6.34 x 10(-8) A cm(-2), an on/off ratio of over 1.44 x 10(5), and a stable working duration of similar to 300 min are achieved, indicating its excellent tolerance to high temperature and ideal compatibility for practical applications.

Automated summary

The study demonstrated the fabrication of high-temperature, self-powered photodetectors using 0D-3D mixed-dimensional perovskite films and a simple carbon-electrode device configuration, achieving outstanding photodetection performance at temperatures up to 300 degrees Celsius. The Cs4Pb(BrCl)(6) perovskite effectively suppresses phase transitions in CsPbBr2-xCl1+x, resulting in stable operation and high tolerance to high temperatures, with a dark current density of 6.34 x 10(-8) A cm(-2) and an on/off ratio exceeding 1.44 x 10(5).