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• W2996058467 startingPage "2854" @default.
• W2996058467 abstract "A single-layer MoS2 achieves excellent gate controllability within the nanoscale channel length of a field-effect transistor (FET) owing to an ultra-short screening length. However, multilayer MoS2 (ML-MoS2) is more vulnerable to short channel effects (SCEs) owing to its thickness and long screening length. We eliminated the SCEs in an ML-MoS2 FET (thickness of 4-13 nm) at a channel length of sub-30 nm using a Schottky barrier (SB) variable graphene/ML-MoS2 heterojunction. Although the band modulation in the ML-MoS2 channel worsens with a decrease in the channel length, which is similar to the SCEs occurring in conventional FETs, the variable Fermi level (EF) of a graphene electrode along the gate voltage allows control of the SB at the graphene/MoS2 junction and backs up the current modulation through a variable SB. Electrical measurements and a theoretical band simulation demonstrate the efficient SB modulation of our graphene nanogap (GrNG) ML-MoS2 FET with three distinct carrier transports along Vgs: a thermionic emission at a low SB, Fowler-Nordheim tunneling at a moderate SB, and direct tunneling at a high SB. Our GrNG FET shows an extremely high on-off current ratio of ∼108, which is approximately three-orders of magnitude better than a previously reported metal nanogap (MeNG) FET and a self-aligned metal/graphene nanogap FET with a similar MoS2 thickness. Our GrNG FET also exhibits a 100,000-times higher on-off ratio, 100-times lower subthreshold swing, and 10-times lower drain induced barrier." @default.
• W2996058467 created "2019-12-26" @default.
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• W2996058467 date "2019-12-19" @default.
• W2996058467 modified "2023-10-15" @default.
• W2996058467 title "Schottky Barrier Variable Graphene/Multilayer-MoS₂ Heterojunction Transistor Used to Overcome Short Channel Effects" @default.
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• W2996058467 doi "https://doi.org/10.1021/acsami.9b18577" @default.
• W2996058467 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31855598" @default.
• W2996058467 hasPublicationYear "2019" @default.
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