Electrodeposition‐Grown Mixed‐Halide Inorganic Perovskite CsPbI _3‐x Br _x Nanowires for Nanolaser Applications

Exploring new low-cost and controllable synthesis methods for perovskite nanowires plays an important role in achieving their large-scale applications. However, there have been no studies on the synthesis of cesium lead halide nanowires using the electrodeposition method. In this study, the single-crystal mixed-halide W-CsPbI_3-xBr_x nanowires are first synthesized via a low-cost and controllable electrodeposition method. The growth process of the W-CsPbI_3-xBr_x nanowires is observed in situ by using a metallurgical microscope. It is found that the W-CsPbI_3-xBr_x nanowires are grown via the oriented attachment of B-CsPbI_3-xBr_x nanocubes. More importantly, the mixed-halide W-CsPbI_3-xBr_x nanowires can transform into single-crystal B-CsPbI_3-xBr_x nanowires at a moderate annealing temperature. The obtained B-CsPbI_3-xBr_x nanowires are applied to nanolasers, and two lasing peaks are observed at 679 and 675 nm, with a threshold of 277.6 µJ cm^-2. These results can promote the development of growth methods for perovskite nanomaterials, which can broaden the applicability of perovskite nanowires in integrated nanophotonic and optoelectronic devices.