期刊
APPLIED SURFACE SCIENCE
卷 604, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2022.154540
关键词
Graphene/GeN3; Schottky barrier; van der Waals heterostructure; Vertical strain; Horizontal strain
类别
资金
- National Natural Science Foundation of China [21973012, 21905050]
- Natural Science Foundation of Fujian Province [2021J06011, 2020J01351, 2020J01474, 2021H6011, 2021J01590]
- Qishan Scholar Scientific Research Project of Fuzhou University
In this study, the electronic property and Schottky barrier of graphene/GeN3 van der Waals (vdW) heterostructure were investigated using first-principles calculations. It was found that the p-type Schottky contact in the heterostructure can be effectively tuned by both vertical and horizontal strains. Furthermore, the optoelectronic field-effect transistor based on the heterostructure exhibited distinguished responsivity and impressive external quantum efficiency.
Graphene-based van der Waals (vdW) heterostructures have shown great potential in electronic and optoelectronic nanodevices. Herein, we investigate the electronic property and Schottky barrier of graphene/GeN3 vdW heterostructure by first-principles calculations. It is noted that the electronic natures of graphene and GeN3 monolayers are well preserved in the heterostructure lattice due to the weak vdW interaction. Interestingly, the p-type Schottky contact in graphene/GeN3 heterostructure with a barrier height of 0.21 eV can be effectively tuned by both vertical and horizontal strains. Herein, the carrier concentration in the graphene layer reaches similar to 10(13) cm(-2) level by strain engineering. It is noteworthy that the designed optoelectronic field-effect transistor based on graphene/GeN3 heterostructure exhibits distinguished responsivity of 0.297 AW(-1) and impressive external quantum efficiency of 54.5% under illumination based on further non-equilibrium Green's function simulations. Our findings are of utmost significance for the metal-semiconductor vdW contact and corresponding applications in high-performance electronic and optoelectronic devices.
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