Non-equilibrium Green’s function analysis of cross section and channel length dependence of phonon scattering and its impact on the performance of Si nanowire field effect transistors

Aldegunde, M., Martinez, A. and Asenov, A. (2011) Non-equilibrium Green’s function analysis of cross section and channel length dependence of phonon scattering and its impact on the performance of Si nanowire field effect transistors. Journal of Applied Physics, 110(9), 094518. (doi: 10.1063/1.3658856)

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Publisher's URL: http://dx.doi.org/10.1063/1.3658856

Abstract

In this paper, we study the effect of phonon scattering in silicon nanowire field effect transistors (NWFET) using a Non-equilibrium Green's function formalism in the effective mass approximation. The effect of electron-phonon scattering on the current voltage characteristics at high and low drain bias is investigated in detail. A wide range of cross-sections (from 2.2 x 2.2 to 6.2 x 6.2 nm(2)) and channel lengths (from 6 to 40 nm) are considered. The impact of phonon scattering on the electron current in different regions of the device characteristics is studied. Simulations including scattering in the whole transistor are compared with corresponding simulations in which scattering is only in the channel. Phonon limited mobility dependence on the NWFET cross-section and channel length is studied. The ballisticity coefficient, as a function of the channel length and gate voltage, is also computed for various channel cross-sections and lengths at high drain bias. The paper demonstrates that tunneling plays an important role in understanding the effect of phonon scattering at short channel lengths.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Asenov, Professor Asen and Martinez, Dr Antonio
Authors: Aldegunde, M., Martinez, A., and Asenov, A.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Applied Physics
Journal Abbr.:J. App. Phys.
ISSN:0021-8979
ISSN (Online):1089-7550
Published Online:11 November 2001

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
530471Quantum Transport Simulations of Next Generation Field Effect TransistorsAntonio MartinezEngineering & Physical Sciences Research Council (EPSRC)EP/1004084/1Electronic and Nanoscale Engineering
443791Atomic scale simulation of nanoelectronic devicesAsen AsenovEngineering & Physical Sciences Research Council (EPSRC)EP/E038344/1Electronic and Nanoscale Engineering