Surface and Interface Engineering in Perovskite Micro–Nano Lasers

Abstract Since its invention, the laser has profoundly revolutionized science and technology. Metal halide perovskites have emerged as a promising class of semiconductors to advance laser technology further due to their high gain coefficient, tunable optical bandgap, long carrier diffusion length, and easy solution processing. This review comprehensively summarizes the developments in metal halide perovskite lasers based on surface and interface engineering. To begin with, the effects of surface and interface engineering on the optoelectronic properties and stability of the perovskite gain medium are discussed from the perspective of materials chemistry and physics. Then, the influence of surface and interface engineering on the electron–phonon interaction and charge carrier dynamics in different types of perovskite lasers is analyzed at the device level. Finally, the challenges and perspectives on the continuous‐wave perovskite lasers and electrically pumped perovskite lasers are discussed. This review is hoped to promote the realization of continuous‐wave perovskite electrically pumped lasers and expand their practical technology applications.