Highly Stable Solution‐Processed CsZnPbI ₃ Perovskite Distributed Feedback Lasers

Abstract Metal halide perovskites (MHPs) have garnered considerable interest as alternative semiconductor‐based laser sources due to their low‐cost and low‐temperature solution processability. Among them, cesium lead iodide (CsPbI ₃ ) stands out as a promising candidate for light–emitting diodes and laser applications. However, achieving long‐term structural and operational stability remains a significant challenge. In this study, CsPbI ₃ is alloyed with zinc (Zn) and incorporated 3% polyvinylpyrrolidone (PVP) into the precursor solution to enhance film quality and device performance. A second‐order CsZn _0.4 Pb _0.6 I ₃ thin film distributed feedback (DFB) laser is demonstrated with the grating formed directly on the perovskite by holographic lithography using Nd: YAG laser radiation. CW laser annealing of the laser‐processing damage is found beneficial for stabilizing the DFB laser output parameters. The DFB laser based on the PVP: CsZn _0.4 Pb _0.6 I ₃ film exhibits a lasing threshold of 55 µJ cm ^{− 2} at room temperature with a lasing peak centered at 709 nm in the deep‐red spectral region. Remarkably, the laser structure can maintain stable operation for over 400 million pulses, or one year if operated at a repetition rate of 10 Hz. This work represents a substantial advancement toward the realization of electrically driven perovskite lasers for future commercial applications.