High-performance near-infrared Schottky-photodetector based graphene/In2S3 van der Waals heterostructures

摘要

Two-dimensional (2D) β-In _(2) S _(3) is a natural defective n-type semiconductor attracting considerable interest for its excellent photoelectronic performance. However, β-In _(2) S _(3) based photodetectors exhibited a weak near-infrared photoresponse compared to visible wavelength in past reports. In this work, high-quality 2D β-In _(2) S _(3) nanosheets were prepared by a space-confined chemical vapor deposition (CVD) method. Graphene/In _(2) S _(3) van der Waals heterostructures were constructed to realize an enhanced near-infrared photodetection performance by a series of transfer processes. The photodetectors based on graphene/In _(2) S _(3) van der Waals heterostructures through junction carrier separation exhibited a better infrared performance of high photoresponsivity ( R _(light) ) of 0.49 mA W ~(?1) , external quantum efficiency (EQE) of 0.07%, and detectivity ( D *) of 3.05 × 10 ~(7) jones using an 808 nm laser.