设计并构建Ⅰ型SnSe_(2)/ZnS异质结构提升其光电化学探测及水分解性能  

Type-ⅠSnSe_(2)/ZnS heterostructure improving photoelectrochemical photodetection and water splitting

作　　者：薛馨怡 卢春辉 罗铭威 韩涛涛 刘玉琪 葛燕青 董雯 徐新龙 Xinyi Xue;Chunhui Lu;Mingwei Luo;Taotao Han;Yuqi Liu;Yanqing Ge;Wen Dong;Xinlong Xu(Shaanxi Joint Lab of Graphene,State Key Laboratory of Photon-Technology in Western China Energy,International Collaborative Center on Photoelectric Technology and Nano Functional Materials,Institute of Photonics&Photon-Technology,School of Physics,Northwest University,Xi’an 710069,China)

机构地区：[1]Shaanxi Joint Lab of Graphene,State Key Laboratory of Photon-Technology in Western China Energy,International Collaborative Center on Photoelectric Technology and Nano Functional Materials,Institute of Photonics&Photon-Technology,School of Physics,Northwest University,Xi’an 710069,China

出　　处：《Science China Materials》2023年第1期127-138,共12页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(12074311)。

摘　　要：二维范德瓦尔斯异质结构广泛应用于光电化学(PEC)型光电探测器、水分解和太阳能电池等光电器件中.其中,Ⅰ型异质结构对于设计新型光电器件至关重要,然而其能带排列对光电响应的影响尚不清楚.本文利用两步物理气相沉积法构建了Ⅰ型SnSe_(2)/ZnS异质结构,并通过紫外光电子能谱和X射线光电子能谱进行了验证.基于Ⅰ型SnSe_(2)/ZnS异质结构的光电化学探测器在紫外可见范围内具有良好的光响应、高稳定性和高灵敏度.SnSe_(2)/ZnS的光响应可达172.60μA W^(-1),分别是单一ZnS和SnSe_(2)样品的7.4和2.0倍.并且,SnSe_(2)/ZnS异质结构具有较高的光电催化分解水活性,在2 h内总产氢量可达81.25μmol cm-2.SnSe_(2)/ZnS异质结优异的光电探测和水分解性能主要源于其更高的光利用率和高效电荷传输的协同作用.本工作为通过构建Ⅰ型异质结构来提高光电响应并设计高性能光电探测器和水分解等光电器件提供了一种新方法.Two-dimensional van der Waals heterostructures have been widely designed and applied to numerous optoelectronic devices such as photoelectrochemical(PEC)-type photodetectors,water splitting,and solar cells.The understanding of the influence of band alignment in type-Ⅰheterostructures on the photoelectric response remains incomplete yet essential for designing new optoelectronic devices.Herein,two-step physical vapor deposition is used to construct a type-ⅠSnSe_(2)/ZnS heterostructure,which is confirmed by ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy.The type-Ⅰheterostructure-based PEC-type photodetector exhibits excellent photoresponse,high stability,and high sensitivity in the ultraviolet-visible range.Furthermore,the photoresponsivity of SnSe_(2)/ZnS is up to 172.60μA W^(-1),which is 7.4-and 2.0-fold larger than that of pure ZnS and SnSe_(2),respectively.Moreover,the SnSe_(2)/ZnS heterostructure possesses high photoelectrocatalytic activity in water splitting,and the total hydrogen production within 2 h is up to 81.25μmol cm-2.The high PEC-type photodetector and water splitting performances in SnSe_(2)/ZnS are due to the synergistic effect of high light utilization and efficient charge transport.Our work provides a new method for improving photoelectric response by forming type-Ⅰheterostructures and for designing high-performance optoelectronic devices for photodetectors and water splitting.

关 键 词：物理气相沉积法 X射线光电子能谱 异质结构 光电器件 紫外光电子能谱 光电化学 光电探测器 光电响应 

分 类 号：TB383.2[一般工业技术—材料科学与工程]