Stability, structural, optical, and morphological properties of cesium lead bromine films deposited by laser ablation

Metal Halide Perovskites (MHPs) have garnered significant attention for several attractive properties, making them suitable for numerous applications, including light-emitting devices, lasers, photodetectors, solar cells, and radiation detectors. This study focuses on the deposition of MHPs via pulsed laser ablation (PLD), with a particular emphasis on CsPbBr3/Cs4PbBr6 films. The robust stability of PLD-deposited Cs-Pb-Br-based films over two years is demonstrated through an examination of their structural, optical, and emission properties of the films. They retain UV-Vis absorption characteristics and crystalline phases, with only a slight variation in peak intensity. Notably, a robust emission at 520 nm under 395 nm diode laser excitation is recorded two years after deposition, even without the presence of a protective layer. Our study point out that the choice of the deposition conditions is a critical factor to obtain film stability over time. Specifically, the films are deposited using a KrF laser beam at a background pressure of 10<^>-2 Pa and a target-substrate distance of 3 cm. The rationale behind choosing these conditions is discussed in relation to the unique aspects of the deposition process and their interplay with perovskite physics.