Two-Step Patterning of Scalable All-Inorganic Halide Perovskite Arrays.

Halide perovskites have many important optoelectronic properties, including high emission efficiency, high absorption coefficients, color purity and tunable emission wavelength, which makes this material promising for optoelectronic applications. However, the inability to precisely control large-scale patterned growth of halide perovskites limits their potential toward various device applications. Here, we report a patterning method for the growth of cesium lead halide perovskite single crystal array. Our approach is consisted of two steps: (1) cesium halide salt arrays patterning and (2) chemical vapor transport (CVT) process to convert salt arrays into single crystal perovskite arrays. Characterizations including energy-dispersive x-ray spectroscopy and photoluminescence have been employed to confirm the chemical compositions and the optical properties of the as-synthesized perovskite arrays. This patterning method enables the patterning of single crystal cesium lead halide perovskite arrays with tunable spacing (from 2 µm to 20 µm) and crystal size (from 200 nm to 1.2 µm) in high production yield (almost every pixel in the array is successfully grown with a converted perovskite crystals). Our large-scale patterning method renders a platform for study of fundamental properties and opportunities for novel perovskite-based optoelectronic applications.