Spray-coated CsPbBr3/CsPb2Br5 thin film photodetectors from nanocrystalline inks

Abstract

Herein, we developed a simple approach for the fabrication of thin film inorganic perovskite and perovskite-related photoconductors. First, we synthesized CsPbBr3 and CsPb2Br5 nanoinks solutions under near-ambient conditions. Second, we demonstrated the deposition of thin films with tunable properties from these nanoinks by a scalable spray-coting process with a commercial airbrush at low temperature. Eventually, the photoresponse of different films was recorded under monochromatic blue light. The photocurrent increases linearly with input power and achieves over three orders of magnitud differences between photocurrent and dark current.