Cu<sub>2</sub>ZnSnS<sub>4</sub>–Ag<sub>2</sub>S Nanoscale p–n Heterostructures as Sensitizers for Photoelectrochemical\nWater Splitting
Xuelian Yu (336275)Jingjing Liu (305549)Aziz Genç (1494439)Maria Ibáñez (1429519)Zhishan Luo (1494445)Alexey Shavel (1494421)Jordi Arbiol (1395220)Guangjin Zhang (1483591)Yihe Zhang (1424539)Andreu Cabot (1494442)
Abstract
A cation\nexchange-based route was used to produce Cu<sub>2</sub>ZnSnS<sub>4</sub> (CZTS)–Ag<sub>2</sub>S nanoparticles with\ncontrolled composition. We report a detailed study of the formation\nof such CZTS–Ag<sub>2</sub>S nanoheterostructures and of their\nphotocatalytic properties. When compared to pure CZTS, the use of\nnanoscale p–n heterostructures as light absorbers for photocatalytic\nwater splitting provides superior photocurrents. We associate this\nexperimental fact to a higher separation efficiency of the photogenerated\nelectron–hole pairs. We believe this and other type-II nanoheterostructures\nwill open the door to the use of CZTS, with excellent light absorption\nproperties and made of abundant and environmental friendly elements,\nto the field of photocatalysis.
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