Electrodeposition-Grown Mixed-Halide Inorganic Perovskite CsPbIBr 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-CsPbIBr nanowires are first synthesized via a low-cost and controllable electrodeposition method. The growth process of the W-CsPbIBr nanowires is observed in situ by using a metallurgical microscope. It is found that the W-CsPbIBr nanowires are grown via the oriented attachment of B-CsPbIBr nanocubes. More importantly, the mixed-halide W-CsPbIBr nanowires can transform into single-crystal B-CsPbIBr nanowires at a moderate annealing temperature. The obtained B-CsPbIBr nanowires are applied to nanolasers, and two lasing peaks are observed at 679 and 675 nm, with a threshold of 277.6 µJ cm. 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.