Effect of confined acoustic phonons on the electron mobility of rectangular nanowires

In this paper, we assess the impact of the confined acoustic phonon boundary conditions on the electron mobility of semiconductor nanowires. Specifically, we present an approach to compute the phonon dispersion relationship considering clamped boundary conditions when the nanowires are considered as...

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Bibliographic Details
Published in:Applied physics letters 2013-10, Vol.103 (16)
Main Authors: Tienda-Luna, I. M., Ruiz, F. G., Godoy, A., Donetti, L., Martínez-Blanque, C., Gámiz, F.
Format: Article
Language:English
Subjects:
Acoustics
Boundary conditions
Clamping
Electron mobility
Nanowires
Phonons
Schroedinger equation
Semiconductors
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Summary:In this paper, we assess the impact of the confined acoustic phonon boundary conditions on the electron mobility of semiconductor nanowires. Specifically, we present an approach to compute the phonon dispersion relationship considering clamped boundary conditions when the nanowires are considered as an anisotropic continuum. Phonon spectra for free-standing and clamped boundary conditions are compared, and scattering rates are calculated. Electron states in the nanowire are computed by self-consistently solving the Poisson and Schrödinger equations, and electron mobility is obtained by the Kubo formula. We show how the use of different boundary conditions affects the mobility depending on the device size.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4825210