Journal
IEEE ELECTRON DEVICE LETTERS
Volume 31, Issue 6, Pages 531-533Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2010.2045100
Keywords
Graphene; Schottky barrier (SB); subthreshold swing; thin body; transistor scaling
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Funding
- Nanoelectronics Research Initiative through Midwest Institute for Nanoelectronics Discovery
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A general solution for the electrostatic potential in an atomic-thin-body field-effect transistor (ATB-FET) geometry is presented. The effective electrostatic scaling length lambda(eff) is extracted from the analytical model, which cannot be approximated by the lowest order eigenmode as traditionally done in SOI-MOSFETs. An empirical equation for the scaling length that depends on the geometry parameters is proposed. It is shown that, even for a thick SiO(2) back oxide, lambda(eff) can be improved efficiently by a thinner top oxide thickness and, to some extent, with high-k dielectrics. The model is then applied to a self-consistent simulation of graphene nanoribbon (GNR) Schottky-barrier FETs (SB-FETs) at the ballistic limit. In the case of GNR SB-FETs, for a large lambda(eff), the scaling is limited by the conventional electrostatic short-channel effects. On the other hand, for a small lambda(eff), the scaling is limited by direct source-to-drain tunneling. A subthreshold swing below 100 mV/dec is still possible with a sub-10-nm gate length in GNR SB-FETs.
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