Photoelectrochemically Active and Environmentally Stable CsPbBr 3 /TiO 2 Core/Shell Nanocrystals

Abstract Inherent poor stability of perovskite nanocrystals (NCs) is the main impediment preventing broad applications of the materials. Here, TiO 2 shell coated CsPbBr 3 core/shell NCs are synthesized through the encapsulation of colloidal CsPbBr 3 NCs with titanium precursor, followed by calcination at 300 °C. The nearly monodispersed CsPbBr 3 /TiO 2 core/shell NCs show excellent water stability for at least three months with the size, structure, morphology, and optical properties remaining identical, which represent the most water‐stable inorganic shell passivated perovskite NCs reported to date. In addition, TiO 2 shell coating can effectively suppress anion exchange and photodegradation, therefore…

• NS
  National Science Foundation

  Award: DMR‐1120296
• NN
  National Natural Science Foundation of China

  Award: 21403260