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- W2000471818 abstract "We present a theoretical explanation of the interfacial component in the gate resistance of Schottky-barrier-gate field-effect transistors (SBGFETs). This component was recently established and was found, for GaAs- and InP-based SBGFETs, to have the smallest practically achievable normalized value ${r}_{mathrm{gi}}$ on the order of ${10}^{ensuremath{-}7} ensuremath{Omega}{mathrm{cm}}^{2}.$ We show that ${r}_{mathrm{gi}}$ in this range can be modeled as an ac tunneling resistance ${r}_{mathrm{IT}}$ between the three-dimensional (3D) gate metal and the 2D semiconductor surfaces states. We extend Cowley and Sze's static Schottky-barrier lineup model to include high-frequency modulation of the surface-state occupation by an ac gate voltage. We find that, since ${r}_{mathrm{IT}}$ is not simply a dc resistance in series with the standard parasitic gate resistance, the resulting experimentally observed ${r}_{mathrm{gi}}$ is smaller by an amount that depends on the interfacial layer and surface-state density. However, for the typically observed values, ${r}_{mathrm{gi}}$ acts like a series resistance up to presently attainable frequencies. Thus, while Cowley and Sze's phenomenological ``interfacial layer of the order of atomic dimensions'' is more or less ``transparent to electrons,'' it presents a resistance that cannot be ignored at microwave and millimeter-wave frequencies. We apply our theory using interfacial-layer parameter values corresponding to alternative models for Schottky-barrier formation, and compare the predictions to experimental observations. Our results are consistent with models that involve defects near the semiconductor-metal interface." @default.
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- W2000471818 date "1999-05-15" @default.
- W2000471818 modified "2023-10-18" @default.
- W2000471818 title "Dispersion and tunneling analysis of the interfacial gate resistance in Schottky barriers" @default.
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- W2000471818 doi "https://doi.org/10.1103/physrevb.59.13102" @default.
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