All-Inorganic CsPbBr3 Perovskite for Vortex Laser Application

CsPbBr₃ Perovskite has been widely studied for its excellent optoelectronic properties and its tunable band gap of 2.3 eV, making it suitable for direct green laser emission. It also has superior thermal and moisture stability compared to its organic metal halide perovskite counterparts. In order to achieve direct vortex generation from the perovskite material, a pristine thin film morphology is essential for metastructure fabrication. Pristine CsPbBr₃ thin film formation is known to be challenging due to undesirable formation of non-perovskite phases. In this study different deposition techniques, including epitaxial chemical vapor deposition and space-confined melt crystallization has been studied. Both methods yield excellent photoluminescence and lasing thresholds below 100 µJ cm⁻², depending on the size of the desired microstructure.