Air-stable CsPb1−xBixBr3 (0 ≤ x ≪ 1) perovskite crystals: optoelectronic and photostriction properties

Abstract

The growth of single crystals allows a more accurate and reliable study of the intrinsic electrical and optical properties of halide perovskite materials. However, all-inorganic halide perovskite single crystals are difficult to prepare due to the poor solubility of the reactant precursors. In this paper, we report a series of air-stable Cs-based halide perovskite single crystals, CsPbBr₃ and CsPb_1−xBi_xBr₃ (x ≪ 1), prepared via a modified antisolvent vapour-assisted crystallization method. The Cs-based halide perovskites exhibited low trap density and high carrier mobility that are comparable to those of organic–inorganic hybrid halide perovskite materials. Most importantly, the Bi-doped CsPb_1−xBi_xBr₃ perovskites also indicated excellent light absorption (covering the entire visible wavelength) and photostriction (effective photostriction of about 8 × 10⁻⁴) performances, which greatly expands the optoelectronic and optomechanical applications of these inorganic halide perovskite materials.