Optimization of the thermoelectric properties of low-dimensional structures via phonon engineering

Author

Balandin, A. ; Khitun, A. ; Liu, J.L. ; Wang, K.L. ; Borca-Tasciuc, T. ; Chen, G.

Author_Institution

Dept. of Electr. Eng., California Univ., Riverside, CA, USA

fYear

1999

fDate

Aug. 29 1999-Sept. 2 1999

Firstpage

189

Lastpage

192

Abstract

We report the first direct observation of confined acoustic phonon modes in a single semiconductor thin film. High-resolution Raman spectroscopy of ultra-thin silicon-on-insulator (SOI) structures reveals multiple quasi-equidistant peaks in the spectral range from 50 cm/sup -1/ to 160 cm/sup -1/. Confined nature of phonon transport in low-dimensional structures with the finite acoustic mismatch indicates an additional tuning capability for optimizing of thermoelectric properties of these structures. Our experimental results are consistent with the recent theoretical predictions of the strong decrease of the lateral lattice thermal conductivity due to phonon confinement.

Keywords

Raman spectra; electron-phonon interactions; silicon-on-insulator; thermal conductivity; thermoelectric power; Raman spectroscopy; Si; confined acoustic phonon modes; finite acoustic mismatch; lateral lattice thermal conductivity; low-dimensional structures; phonon confinement; phonon engineering; phonon transport; single semiconductor thin film; thermoelectric properties; tuning capability; ultra-thin silicon-on-insulator structures; Acoustic materials; Laboratories; Phonons; Polymer films; Semiconductor films; Semiconductor materials; Semiconductor superlattices; Semiconductor thin films; Thermal conductivity; Thermoelectricity;

fLanguage

English

Publisher

ieee

Conference_Titel

Thermoelectrics, 1999. Eighteenth International Conference on

Conference_Location

Baltimore, MD, USA

ISSN

1094-2734

Print_ISBN

0-7803-5451-6

Type

conf

DOI

10.1109/ICT.1999.843365

Filename

843365