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CsPbBr3 perovskite nanocrystal/S doping g-C3N4 ultra-thin nanosheet heterojunction with enhanced interfacial charge transfer for photocatalytic CO2 reduction
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1  Harbin Institute of Technology


Lead halide perovskite has attracted great attentions for the applications in perovskite solar cells and LED devices and it also has the great potential in photocatalytic applications due to high extinction coefficients, and long electron-hole diffusion lengths. However, the rapid recombination rate of photogenerated electron-hole pairs still limits the photocatalytic activity. Herein, a novel CsPbBr3 quantum dots/S doping g-C3N4 ultrathin nanosheet 0D/2D heterojunctions photocatalyst are prepared by loading perovskite quantum dots onto ultrathin doped g-C3N4. The strategy of S element doping improved the properties of in g-C3N4 ultra-thin structure providing more adsorption and reaction sites for photocatalytic activity. And the type II band alignment structure of CsPbBr3 / g-C3N4 heterostructure effectively improved the separation and transmission of photogenerated carriers and inhibit the recombination of photogenerated carriers, thus improving the photocatalytic CO2 reduction performance. This study provides a facile and effective method for synthesis of halide perovskite based photocatalysts, which holds the potential for further application in environmental and energy field.

Keywords: perovskite; photocatalysis; g-C3N4; CO2; quantum dots;