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Thermoelectric Properties of Undoped and Si-doped Bulk GaN

Published online by Cambridge University Press:  07 November 2013

Baozhu Wang ,
Bahadir Kucukgok ,
Qinyue He ,
Andrew G. Melton ,
Jacob Leach ,
Kevin Udwary ,
Keith Evans ,
Na Lu  and
Ian T. Ferguson
Baozhu Wang
Affiliation:
College of Information Science and Engineering, Hebei University of Science and Technology, 70 Yuhua East Rd., Shijiazhuang, Hebei 050018, China.
Bahadir Kucukgok
Affiliation:
Department of Electrical and Computer Engineering, University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, NC 28223, USA.
Qinyue He
Affiliation:
Department of Electrical and Computer Engineering, University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, NC 28223, USA.
Andrew G. Melton
Affiliation:
Department of Electrical and Computer Engineering, University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, NC 28223, USA.
Jacob Leach
Affiliation:
Kyma Technologies, 8829 Midway West Road, Raleigh, NC 27617, USA
Kevin Udwary
Affiliation:
Kyma Technologies, 8829 Midway West Road, Raleigh, NC 27617, USA
Keith Evans
Affiliation:
Kyma Technologies, 8829 Midway West Road, Raleigh, NC 27617, USA
Na Lu
Affiliation:
Department of Engineering Technology, University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, NC28223, USA.
Ian T. Ferguson
Affiliation:
Department of Electrical and Computer Engineering, University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, NC 28223, USA.
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Abstract

In this study, thermoelectric properties of bulk and epitaxy GaN with various doping concentration are investigated. Seebeck coefficients decreased with the increase of carrier concentration for both bulk and epitaxial GaN samples, and the Seebeck coefficients of epitaxial GaN samples are found to be larger than that of bulk GaN samples in the similar carrier density due to the higher dislocation scattering. For epitaxial samples, a high power factor of 4.72 × 10-4 W/m-K2 is observed. The power factors of the bulk GaN samples are in the range of from 0.315× 10-4W/m-K2 to 0.354× 10-4W/m-K2 due to the low Seebeck coefficients.

Keywords

thermoelectricnitridedislocations

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Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1558: Symposium Z – Nanotechnology and Sustainability , 2013 , mrss13-1558-z09-03
Copyright
Copyright © Materials Research Society 2013 

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