Inherent poor stability of perovskite nanocrystals (NCs) is the main impediment preventing broad applications of the materials. Here, TiO2 shell coated CsPbBr3 core/shell NCs were realized through the encapsulation of colloidal CsPbBr3 NCs with titanium precursor, followed by calcination at 300 oC. The nearly monodispersed CsPbBr3/TiO2 core/shell NCs show excellent water stability for at least 3 months with the size, structure, morphology and optical properties remaining identical. In addition, TiO2 shell coating can effectively suppress anion exchange and photo-degradation, therefore dramatically improving the chemical stability and photo-stability of the core CsPbBr3 NCs. More importantly, photoluminescence (PL) and (photo)electrochemical characterizations exhibit increased charge separation efficiency due to the electrical conductivity of the TiO2 shell, hence leading to an improved photoelectric activity in water. This study opens new possibilities for optoelectronic and photocatalytic applications of perovskites-based NCs in aqueous phase.

Environmentally stable CsPbBr3/TiO2 core/shell nanocrystals with enhanced charge transport properties

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.