4.8 Article

Deformation Potentials and Electron-Phonon Coupling in Silicon Nanowires

Journal

NANO LETTERS
Volume 10, Issue 3, Pages 869-873

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/nl9034384

Keywords

Silicon nanowire; electron-phonon; deformation potentials; mobility; relaxation time

Funding

  1. Science Foundation Ireland [06/IN, 1/1857]
  2. 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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