Reversible light-mediated compositional and structural transitions between CsPbBr3 and CsPb2Br5 nanosheets.

ABSTRACT

This communication describes a new method to achieve reversible light-induced chemical composition and phase structural transitions from polyvinylpyrrolidone-capped orthorhombic CsPbBr3 to tetragonal CsPb2Br5 nanosheets or vice versa. This work will deepen our understanding of the controlled synthesis, post-processing, and decomposition pathway of cesium lead halide perovskite nanocrystals.