Self-Powered All-Inorganic Perovskite Photodetectors with Fast Response Speed

In this manuscript, the inorganic perovskite CsPbI₂Br and CsPbIBr₂ are investigated as photoactive materials that offer higher stability than the organometal trihalide perovskite materials. The fabrication methods allow anti-solvent processing the CsPbI_xBr_3-x films, overcoming the poor film quality that always occur in a single-step solution process. The introduced diethyl ether in spin-coating process is demonstrated to be successful, and the effects of the anti-solvent on film quality are studied. The devices fabricated using the methods achieve high-performance, self-powered and the stabilized photodetectors show fast response speed. The results illustrate a great potential of all-inorganic CsPbI_xBr_3-x perovskites in visible photodetection and provide an effective way to achieve high performance devices with self-powered capability.