Journal
NANO LETTERS
Volume 10, Issue 3, Pages 869-873Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl9034384
Keywords
Silicon nanowire; electron-phonon; deformation potentials; mobility; relaxation time
Categories
Funding
- Science Foundation Ireland [06/IN, 1/1857]
- European Union
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The role of reduced dimensionality and of the surface on electron-phonon (e-ph) coupling in silicon nanowires is determined from first principles, Surface termination and chemistry is found to have a relatively small influence, whereas reduced dimensionality fundamentally alters the behavior of deformation potentials. As a consequence, electron coupling to breathing modes emerges char cannot be described by conventional treatments of e-ph coupling. The consequences for physical properties such as scattering lengths and mobilities are significant: the mobilities for [110] grown wires are 6 times larger than those for [100] wires, all effect that cannot be predicted without the form we find for Si nanowire deformation potentials.
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