A fractional crystallization technique towards pure mega-size CsPb2Br5 single crystal films

Abstract

A facile fractional crystallization technique was developed to prepare single crystalline CsPb₂Br₅ films using water as the solvent, and the films can be easily transferred onto various substrates for the device fabrication. The obtained films can be up to 600 × 600 μm² and decrease to 50 nm in thickness with high crystalline quality as well as temperature and air stability.