Confined Phonons in Si Nanowires
- 28 January 2005
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 5 (3), 409-414
- https://doi.org/10.1021/nl0486259
Abstract
Raman microprobe studies of long crystalline Si nanowires reveal for the first time the evolution of phonon confinement with wire diameter. The Raman band at approximately 520 cm-1 in bulk Si is found to downshift and asymmetrically broaden to lower frequency with decreasing wire diameter D, in good agreement with a phenomenological model first proposed by Richter et al. An adjustable parameter (alpha) is added to the theory that defines the width of the Gaussian phonon confinement function. We find that this parameter is not sensitive to diameter over the range 4-25 nm.Keywords
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