期刊
VACUUM
卷 206, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2022.111546
关键词
GaN; TMDs; Heterostructures; Self -doped; Polarization; p -n junction
资金
- National Natural Science Foundation, China [11904285]
- National Natural Science Foundation of China [12104362]
- National Natural Science Foundation of Natural Science Basic Research Plan in Shaanxi Province of China [2021JM-345]
- China Postdoctoral Science Foundation [2020M683684XB]
- Natural Science Basic Research Program of Shaanxi [2020JZ-46]
- Shaanxi Provincial Education Department [21JK0789]
In this paper, nonvolatile self-doped p-n junctions are formed in GaN-based heterostructures using density functional theory. High hole and electron carrier concentrations are achieved in TMDs/ML (BL) and (BL) ML/TMDs heterostructures. The results show that the band structures and carrier types of these heterostructures can be modulated by the self-doping induced by GaN polarization, providing a new doping strategy for 2D GaN materials.
The self-doping effects in atomic layer semiconductor materials have shown great potential for the 2D electronics and optoelectronics devices. In this paper, using the density functional theory (DFT), nonvolatile self-doped p-n junctions are formed in GaN based heterostructures which based on the stacking of the hydro-fluorination buckled GaN monolayer (ML) and bilayer (BL) and transition metal dichalcogenides (TMDs) single layer. The electronic properties demonstrated that the space distribution of carrier, and the band structures of the heterostructures depend on the polarization of GaN. The anisotropic hole and electron carrier concentration (ch and ce) are obtained in the WS2 (MoS2)/ML, BL/WSe2, and WS2 (MoS2)/BL heterostructure systems respectively. Moreover, the nonvolatile self-doped p-n junctions are achieved in type-III TMDs/ML (BL) and (BL) ML/TMDs heterostructures with the ultrahigh hole and electron carrier concentration. The type of band structures and carrier of the TMDs/ML (BL) and (BL) ML/TMDs heterostructure systems have been modulated by the self-doped induced by the polarization of GaN, which provides a new doping strategy for 2D GaN based (or polar) materials and simplifies the device fabrication in electronic and optoelectronic field.
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