CsPbI3 quantum dots/polypyrrole microrod 0D/1D heterostructure: Synthesis, formation mechanism and enhanced charge transport property

Highlights: • A CsPbI₃/PPy 0D/1D heterostructure was fabricated. • There is strong interfacial interaction between PPy and CsPbI₃. • The CsPbI₃/PPy composite exhibited efficient charge transport property. Halide perovskite quantum dots (QDs) are regarded as a family of promising materials owing to their outstanding optoelectronic properties. Nevertheless, this class of nanocrystals generally displays unsatisfactory activity in such fields as photovoltaics and photocatalysis, as a result of the serious charge recombination and poor carrier separation. Herein, with the aim to enhance the charge transport property of halide perovskite QDs, we anchored CsPbI₃ QDs on a conducting polymer, polypyrrole (PPy) and obtained a CsPbI₃ QDs/PPy microrod 0D/1D heterostructure. Due to high electrical conductivity of the PPy polymer, the obtained CsPbI₃/PPy composite displayed efficient charge transfer property, as proved by increased photocurrent response and decreased PL intensity. Our work reveals a promising way for enhancing the charge transport property of halide perovskite QDs, thereby facilitating their potential applications in photovoltaics and photocatalysis.