Influence of annealing process on the stable luminous CsPbCl3 perovskite films by thermal evaporation

Inorganic perovskites (CsPbX3, X = Cl, Br and I) have aroused great interest due to their extraordinary optoelectronic properties. Despite their rapid progress, device performances are hindered by the instabilities of perovskites. Herein, we employed a thermal co-evaporation method to prepare stable and compact CsPbCl3 films. These films could maintain stability in ambient air for 12 months. The effect of annealing temperature and annealing time on the CsPbCl3 films were researched. Films had high crystallinity and luminescent intensity with 3 μm large grains at optimal annealing condition. This result provides an insightful understanding of annealing process on CsPbCl3 films, as well as to offer a valuable approach for the future of optoelectronic devices based on perovskite materials. •CsPbCl3 thin films were prepared by thermal co-evaporation.•CsPbCl3 thin films had good stability for 12 months.•The influence of high-temperature annealing process on CsPbCl3 thin films were investigated in detail.