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

In this manuscript, the inorganic perovskite CsPbI(2)Br and CsPbIBr(2) are investigated as photoactive materials that offer higher stability than the organometal trihalide perovskite materials. The fabrication methods allow anti-solvent processing the CsPbI(x)Br(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(x)Br(3−x) perovskites in visible photodetection and provide an effective way to achieve high performance devices with self-powered capability.