Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-12-09
IEEE Trans. El. Dev. 56 (7), 1402 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1109/TED.2009.2021720
The intermediate transport regime in nanoscale transistors between the fully ballistic case and the quasi equilibrium case described by the drift-diffusion model is still an open modeling issue. Analytical approaches to the problem have been proposed, based on the introduction of a backscattering coefficient, or numerical approaches consisting in the MonteCarlo solution of the Boltzmann transport equation or in the introduction of dissipation in quantum transport descriptions. In this paper we propose a very simple analytical model to seamlessly cover the whole range of transport regimes in generic quasi-one dimensional field-effect transistors, and apply it to silicon nanowire transistors. The model is based on describing a generic transistor as a chain of ballistic nanowire transistors in series, or as the series of a ballistic transistor and a drift-diffusion transistor operating in the triode region. As an additional result, we find a relation between the mobility and the mean free path, that has deep consequences on the understanding of transport in nanoscale devices.
Iannaccone Giuseppe
Michetti Paolo
Mugnaini Giorgio
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