Achieving Optically Pumped Perovskite Random Lasing With Corrugated Substrates

Abstract

The unique optoelectronic properties of metal halide perovskites allow for the development of light-emitting diodes and lasers with better color quality, greater energy efficiency, cheaper manufacturing, and a wider range of options for substrates. In this thesis, we explore the feasibility of optically pumped lasing that utilizes the phenomenon of multiple scattering. In order to introduce artificial roughness, glass substrates of various roughnesses at the 1- to 150-µm level were selected and characterized. These substrates were then spin-coated using a MAPbI3 perovskite solution and chlorobenzene antisolvent that worked together to minimize surface defects and therefore reduced the impact of intrinsic material roughness on lasing behavior. When optically pumping using a 355 nm laser, the sample with a circular-patterned substrate demonstrated random lasing beginning at 11 µW pumping power over a spot area of 200 µm by 50 µm. This work constitutes the first observation of large area, wide range random lasing in perovskites using a simple single-layer substrate.