Pulsed Laser Deposition of CsPbBr₃ Films for Application in Perovskite Solar Cells

Organic–inorganic hybrid halide perovskite materials have attracted enormous interest in recent years due to their excellent photovoltaic properties, which are strongly limited by their instability. Solar cells based on the inorganic perovskite materials have been developed rapidly and exhibit excellent stability. The crystalline quality and composition of the perovskite layer play the key role in the efficiency of solar cells. Among the various film deposition techniques, pulsed laser deposition has the distinctive advantages of preparation of thin films of high crystalline quality and close duplication of the composition of the targets. In the work, we applied pulsed laser deposition to prepare a CsPbBr3 thin film that displays good stability in a high-humidity environment. Single crystalline CsPbBr3 powders were grown first by a solution method to prepare the target. The CsPbBr3 plasma produced by focused pulsed laser can permeate into the mesoporous TiO2 layer and distribute uniformly inside. The thickness of mesoporous TiO2 and CsPbBr3 layers has a critical influence on device performance. The device with optimization of the layer thickness can achieve the highest power conversion efficiency of 6.3%.