[O12-31]
Material and Photonic Strategies for Amplified Spontaneous Emission Optimization in Mixed-Cation Halide Perovskites
발표자전예진 (이화여자대학교)
연구책임자노광동 (이화여자대학교)
Abstract
Mixed-cation engineering has been widely adopted in metal halide perovskites to improve film quality and stability, but its impact on optical gain in perovskite lasers remains unexplored. Here, we investigate the amplified spontaneous emission (ASE) property of A-site mixed perovskite thin films by systematically varying cation composition and correlating ASE thresholds with material and optical properties. To suppress surface-related optical losses, a trimming process was employed to remove defective top regions, leading to reduced ASE thresholds, with further stability enhancement achieved by incorporating a two-dimensional material. Photonic optimization via slab waveguide analysis identified an optimal film thickness (~54 nm), while a symmetric waveguide structure using a PMMA overlayer enabled additional threshold reduction. These results demonstrate that combined material, surface, and photonic optimization effectively enhances optical amplification in perovskite thin films.