Photoelectrochemical performance of ligand-free CsPb 2 Br 5 perovskites

Herein, we have developed a method for the facile aqueous synthesis of ligand-free cesium lead halide perovskite nanoplatelets with pure CsPb 2 Br 5 . The ligand-free CsPb 2 Br 5 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 CsPb 2 Br 5 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.