Encapsulation of CsPbBr3 perovskite quantum dots into PPy conducting polymer: Exceptional water stability and enhanced charge transport property

Halide perovskite quantum dots (QDs) are regarded as a rising star of semiconductor materials for modern optoelectronic and photovoltaic applications due to their remarkable optical and electronic properties. However, the inherent poor stability of the materials have restricted their broad applications. Here, we report the one-step synthesis of an ultrastable CsPbBr3/Polypyrrole (PPy) composite by a photocatalytic polymerization method, in which CsPbBr3 QDs act as a photocatalyst and benzoquinone serves as an electron acceptor. The encapsulation of CsPbBr3 QDs into the PPy protective layer dramatically enhances the water stability, which can preserve the structure and morphology even after immersion in water for 30 days. Simultaneously, encapsulating with the electrical conductive PPy layer allows for efficient charge transport properties and improved photoelectric activities in real water testing. This study provides new opportunities for photocatalytic and optoelectronic applications of perovskites QDs in aqueous phase.