A-Site Substitute for Fabricating All-Inorganic Perovskite CsPbCl with Application in Self-Powered Ultraviolet Photodetectors.

Because of its stable chemical properties and wide band gap, CsPbCl perovskite has shown great application prospects in ultraviolet photodetectors (UPDs). However, the poor solubility of CsCl in organic solvents impedes the fabrication of high-quality CsPbCl films. Herein, we introduced an A-site substitute route for fabricating a high-quality CsPbCl microcrystalline (MC) film by spin-coating cesium acetate on a MAPbCl MC film followed by a high-temperature annealing process.