Title

Crossover in thermal transport mechanism in nanocrystalline silicon

Authors

Authors

A. Bodapati; P. Keblinski; P. K. Schelling;S. R. Phillpot

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

CONDUCTIVITY; SIMULATION; GLASSES; SOLIDS; Physics, Applied

Abstract

Using vibrational mode analysis, we demonstrate that lattice vibrations in small grain (less than or similar to 3 nm) structurally inhomogeneous nanocrystalline silicon are almost identical to those in homogeneous amorphous structures with the majority of the vibrations delocalized and unpolarized. As a consequence the principal thermal conductivity mechanism in such a nanocrystalline material is the same as in the amorphous material. With increasing grain size the ability of vibrations to homogenize over the nanocrystalline structure is gradually lost and the phonon spectrum becomes progressively more like that of a crystalline material; this is reflected in a crossover in the mechanism of thermal transport. (c) 2006 American Institute of Physics.

Journal Title

Applied Physics Letters

Volume

88

Issue/Number

14

Publication Date

1-1-2006

Document Type

Article

Language

English

First Page

3

WOS Identifier

WOS:000236612000023

ISSN

0003-6951

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