NDLI: Cross-sectional dependence of electron mobility and lattice thermal conductivity in silicon nanowires

Content Provider	Springer Nature Link
Author	Ramayya, E. B. Vasileska, D. Goodnick, S. M. Knezevic, I.
Copyright Year	2008
Abstract	The thermoelectric efficiency of a material depends on the ratio of its electrical and thermal conductivity. In this work, the cross-sectional dependence of electron mobility and lattice thermal conductivity in silicon nanowires has been investigated by solving the electron and phonon Boltzmann transport equations. The effects of confinement on acoustic phonon scattering (both electron–phonon and phonon–phonon) are accounted for in this study. With decreasing wire cross-section, the electron mobility shows a non-monotonic variation, whereas the lattice thermal conductivity exhibits a linear decrease. The former is a result of the decrease in intervalley and intersubband scattering due to a redistribution of electrons among the twofold-degenerate Δ$_{2}$ and fourfold-degenerate Δ$_{4}$ valley subbands when the cross-section is below 5×5 nm$^{2}$, while the latter is because of the monotonic increase of three phonon umklapp and boundary scattering with decreasing wire cross-section. Among the wires considered, those with a cross-section between 3×3 nm$^{2}$ and 4×4 nm$^{2}$ have the maximal ratio of the electron mobility to lattice thermal conductivity, and are expected to provide the maximal thermoelectric figure of merit.
Starting Page	319
Ending Page	323
Page Count	5
File Format	PDF
ISSN	15698025
Journal	Journal of Computational Electronics
Volume Number	7
Issue Number	3
e-ISSN	15728137
Language	English
Publisher	Springer US
Publisher Date	2008-01-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acoustic phonon confinement Electron mobility Lattice thermal conductivity Mechanical Engineering Optical and Electronic Materials Mathematical and Computational Physics Electronic and Computer Engineering ApplicationMathematics/Computational Methods of Engineering
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering Modeling and Simulation

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