Type-I SnSe2/ZnS heterostructure improving photoelectrochemical photodetection and water splitting

Two-dimensional van der Waals heterostructures have been widely designed and applied to numerous optoelectronic devices such as photoelectrochemical (PEC)-type photodetectors, water splitting, solar cells. The understanding of the influence band alignment in type-I on photoelectric response remains incomplete yet essential for designing new devices. Herein, two-step physical vapor deposition is used construct a SnSe2/ZnS heterostructure, which confirmed by ultraviolet photoelectron spectroscopy X-ray spectroscopy. heterostructure-based PEC-type photodetector exhibits excellent photoresponse, high stability, sensitivity ultraviolet-visible range. Furthermore, photoresponsivity up 172.60 µA W−1, 7.4- 2.0-fold larger than that pure ZnS SnSe2, respectively. Moreover, heterostructure possesses photoelectrocatalytic activity total hydrogen production within 2 h 81.25 µmol cm−2. splitting performances are due synergistic effect light utilization efficient charge transport. Our work provides method improving forming high-performance photodetectors splitting.