Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-10-30
IEEE Trans. Electron Devices 51 (5), 749-756 (2004)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
31 pages, 13 figures, revised version: discussions and references added, to be published in IEEE Trans. Electron. Devices
Scientific paper
10.1109/TED.2004.826844
This paper discusses the influence of the channel impurity distribution on the transport and the drive current in short-gate MOSFET. In this purpose, a careful description of electron-ion interaction suitable for the case of discrete impurities has been implemented in a 3D particle Monte Carlo simulator. This transport model is applied to the investigation of 50 nm MOSFET operation. The results show that a small change in the number of doping impurities or in the position of a single discrete impurity in the inversion layer may significantly influence the drain current. This effect is not only related to threshold voltage fluctuations but also to variations in transport properties in the inversion layer, especially at high drain voltage. The results are analyzed in terms of local fluctuations of electron velocity and current density. In a set of fifteen simulated devices the drive current Ion, determined at VGS = VDS = 0.6 V, is found to vary in a range of 23% according to the position of channel impurities.
Barraud S.
Bournel Arnaud
Dollfus Philippe
Galdin Sylvie
Hesto Patrice
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