Integration of photovoltaic and photogating effects in a WSe₂/WS₂/p-Si dual junction photodetector featuring high-sensitivity and fast-response.

ABSTRACT: Two-dimensional (2D) material-based van der Waals (vdW) heterostructures with exotic semiconducting properties have shown tremendous potential in next-generation photovoltaic photodetectors. Nevertheless, these vdW heterostructure devices inevitably suffer from a compromise between high sensitivity and fast response. Herein, an ingenious photovoltaic photodetector based on a WSe₂/WS₂/p-Si dual-vdW heterojunction is demonstrated. First-principles calculations and energy band profiles consolidate that the photogating effect originating from the bottom vdW heterojunction not only strengthens the photovoltaic effect of the top vdW heterojunction, but also suppresses the recombination of photogenerated carriers. As a consequence, the separation of photogenerated carriers i

SUBMITTER: Huang Z 

PROVIDER: S-EPMC9891068 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature