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- W4212777151 abstract "The electronic properties of 2-Dimensional Van der Waals heterostructure of MX 2 (M:Mo, X:S, Se) and graphene-like ZnO by applying an external electric field(EF) in the range -0.50V/Å to 1.0V/Å is studied using first-principles calculations. The effect of the transverse electric field is measured in terms of modulation of the electronic energy bandgap and change in the band alignment properties. The bandstructure of MoS 2 /ZnO heterostructure(HS) shows an indirect bandgap of 1.61eV with a type-II band alignment and a large built-in electric field of 7.42eV with a valence band offset of 1.22eV across the interface. The bandstructure of MoSe 2 /ZnO shows a direct bandgap of 1.81eV with type-I alignment and a built-in electric field of 3.64eV with a band offset of 0.31eV. The charge density is localized on MoS 2 and ZnO in VBM and CBM respectively in MoS 2 /ZnO HS, whereas in MoSe 2 /ZnO, both VBM and CBM are localized on MoSe 2 . With a perpendicular electric field applied across the HS, re-alignment of bandstructure and modulation of bandgap in both the HSs occurs. The energy bandgap increases linearly with the applied electric field for MoS 2 /ZnO(1.1–2.2eV) and remains almost constant(1.81eV) in the range -0.50V/Å to 0.50V/Å followed by a small decrease with an increase in electric field (1.60 for EF= ± 1.0V/Å). A cross-over in the bandgap type from indirect(type-II) → direct(type-I) in MoS 2 -ZnO and direct(type-I) to indirect(type-II) in MoSe 2 /ZnO has been observed at a critical value of electric field EF=0.75V/Å. The cross-over in band structure is consistent with the charge transfer pattern observed on the application of electric field. Tuning the electronic bandgap and changing the band-alignment with an external electric field opens a way to design futuristic electronic and optical devices ." @default.
- W4212777151 created "2022-02-24" @default.
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- W4212777151 date "2022-04-01" @default.
- W4212777151 modified "2023-10-18" @default.
- W4212777151 title "Electronic bandstructure modulation of MoX2/ZnO(X:S,Se) heterostructure by applying external electric field" @default.
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- W4212777151 doi "https://doi.org/10.1016/j.surfin.2022.101817" @default.
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