High-Temperature Stable FAPbBr₃ Single Crystals for Sensitive X-ray and Visible Light Detection toward Space

Abstract

Organolead trihalide perovskite single crystals (SCs) offer unprecedented opportunity for X-ray and visible light detection. Nevertheless, it remains a challenge to keep simultaneous high-performance and stability at a high-temperature working mode. Herein, formamidinium lead bromide (FAPbBr₃) SCs are developed to successfully address these issues. Low-temperature crystallized induced FAPbBr₃ SCs possess an excellent mobility-lifetime product and an ultralow surface charge recombination velocity, thus exhibiting an X-ray dose rate as low as 0.3 μGy_air s^-1 as a sensitive radiation detector. Furthermore, it also contributes a specific detectivity as high as 3.5 × 10¹² cm Hz^1/2 W^-1, keeping stable at high-temperature of 460 K as a photodetector. A prototype of an imaging system with diffuse reflection mode is constructed using detectors as receivers, enabling defined scanning images in a high temperature environment. The bifunctional FAPbBr₃ SC detectors will motivate new strategies for stable detection in an extreme space environment.