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Systematic Studies of Periodically Nanoporous Si Films for Thermoelectric Applications

Published online by Cambridge University Press:  16 July 2015

Qing Hao ,
Dongchao Xu  and
Hongbo Zhao
Qing Hao
Affiliation:
Aerospace & Mechanical Engineering, University of Arizona, 1130 N Mountain Ave, Tucson, AZ 85721, U.S.A.
Dongchao Xu
Affiliation:
Aerospace & Mechanical Engineering, University of Arizona, 1130 N Mountain Ave, Tucson, AZ 85721, U.S.A.
Hongbo Zhao
Affiliation:
Aerospace & Mechanical Engineering, University of Arizona, 1130 N Mountain Ave, Tucson, AZ 85721, U.S.A.
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Abstract

As the major heat carriers in dielectrics and semiconductors, phonons are strongly scattered by boundaries and interfaces at the nanoscale, which can lead to a significantly reduced lattice thermal conductivity kL. In recent years, such phonon size effects have been used to enhance the thermoelectric performance of various nanostructured materials. With dramatically reduced kL and bulk-like electrical properties, high thermoelectric performance has been demonstrated for nanoporous Si films at room temperature. Despite these encouraging results, however, challenges still exist in the theoretical explanation of the observed low kL values. Existing studies mainly attribute the observed low kL to phononic effects and/or amorphous pore edges. These two effects can be separated when the specific heat of the film can be measured along with kL to provide more insight into the phonon dispersion modification. In this work, both the specific heat and k of a suspended nanoporous Si film is extracted from the 3ω measurements. The result is compared to the reported kL values of various porous Si films. The influence of employed phonon mean free path spectrum on the data analysis is discussed.

Keywords

Sithermal conductivitynanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1779: Symposium M – Nanoscale Heat Transport―From Fundamentals to Devices , 2015 , pp. 27 - 32
Copyright
Copyright © Materials Research Society 2015 

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