Photoelectrochemically active and environmentally stable cspbbr3/tio2 core/shell nanocrystals

Zhi Jun Li, Elan Hofman, Jian Li, Andrew Hunter Davis, Chen Ho Tung, Li Zhu Wu, Weiwei Zheng

Research output: Contribution to journalArticle

132 Scopus citations

Abstract

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 are synthesized through the encapsulation of colloidal CsPbBr3 NCs with titanium precursor, followed by calcination at 300 °C. The nearly monodispersed CsPbBr3/TiO2 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, TiO2 shell coating can effectively suppress anion exchange and photodegradation, therefore dramatically improving the chemical stability and photostability of the core CsPbBr3 NCs. More importantly, photoluminescence and (photo)electrochem-ical 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.

Original languageEnglish (US)
Article number1704288
JournalAdvanced Functional Materials
Volume28
Issue number1
DOIs
StatePublished - Jan 4 2018

Keywords

  • Charge transport
  • Core/shell nanoparticles
  • Functional coatings
  • Titanium dioxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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