Modulating optical properties and interfacial electron transfer of CsPbBr perovskite nanocrystals via indium ion and chlorine ion co-doping.

In this work, we demonstrated an in situ approach for doping CsPbBr nanocrystals (NCs) with In and Cl with a ligand-assisted precipitation method at room temperature. The In and Cl co-doped NCs are characterized by the powder x-ray diffraction patterns, ultraviolet-visible, photoluminescence (PL) spectroscopy, time-resolved PL (TRPL), ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy, and transmission electron microscopy. Based on PL and TRPL results, the non-radiative nature of In-doping induced localized impurity states is revealed.