Photoelectrochemical performance of ligand-free CsPb2Br5 perovskites

Abstract

Herein, we have developed a method for the facile aqueous synthesis of ligand-free cesium lead halide perovskite nanoplatelets with pure CsPb₂Br₅. The ligand-free CsPb₂Br₅ nanoplatelets showed good environmental stability with green and easy synthesis. In addition to their demonstrated good stability in aqueous solutions, and enhanced charge separation and charge transportability, the CsPb₂Br₅ nanoplatelets exhibited an excellent photoresponse, particularly, with a photocurrent density of 8.38 μA cm⁻² in an aqueous solution under 10.18 mW cm⁻² light irradiation in the absence of other electron acceptors.