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• W3189342455 abstract "Exploring gate insulator materials for 2D transistors and their defect properties is of importance for device performance optimization. In this work, the structural and electronic properties of intrinsic vacancies in the CaF2 single layer and its heterostructures with monolayer MoS2 are investigated from first-principles calculations. VCa introduces a shallow defect level close to the VBM, whereas VF introduces a deep level below the CBM. In both cases, spin polarization is observed. Overall, VF has a relatively lower formation energy than VCa, except for the extreme Ca-rich case. Thus, VF should be dominant in CaF2. The band offset between CaF2 and MoS2 is determined to be type-I, with large offsets at both the conduction band and valence band. With the presence of vacancies in CaF2, the type-I band offset is preserved. The electron or hole on the defect states will transfer from CaF2 to MoS2 due to the large band offset, and spin polarization vanishes. Nevertheless, there are no defect states inside the gap or around the band edge of MoS2, and the electronic properties of MoS2 are almost intact. Compared with h-BN that has a small valence band offset with MoS2 and could introduce in-gap defect states, CaF2 can be a good candidate to serve as the dielectric layer of MoS2-based transistors." @default.
• W3189342455 created "2021-08-16" @default.
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• W3189342455 date "2021-08-04" @default.
• W3189342455 modified "2023-09-24" @default.
• W3189342455 title "Electronic properties of intrinsic vacancies in single-layer CaF2 and its heterostructure with monolayer MoS2" @default.
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• W3189342455 doi "https://doi.org/10.1063/5.0055044" @default.
• W3189342455 hasPublicationYear "2021" @default.
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