Foster, Samuel and Neophytou, Neophytos (2019) Doping optimization for the power factor of bipolar thermoelectric materials. Journal of Electronic Materials, 48 . pp. 1889-1895. doi:10.1007/s11664-018-06857-1 ISSN 0361-5235.

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Abstract

Bipolar carrier transport is often a limiting factor in the thermoelectric efficiency of narrow bandgap materials at high temperatures due to the reduction in the Seebeck coefficient and the introduction of an additional term to the thermal conductivity. Using the Boltzmann transport formalism and a two-band model, we simulate transport through bipolar systems and calculate their thermoelectric transport properties: the electrical conductivity, the Seebeck coefficient and the thermoelectric power factor. We present an investigation into the doping optimisation of such materials, showing the detrimental impact that rising temperatures have if the doping (and the Fermi level) is not optimised for each operating temperature. We also show that the doping levels for optimized power factors at a given operating temperature differ in bipolar systems compared to unipolar ones. We show finally that at 600 K, in a bipolar material with bandgap approximately that of Bi2Te3, the optimal doping required can reside between 10% and 30% larger than that required for an optimal unipolar material depending on the electronic scattering details of the material.

Item Type:	Journal Article
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH):	Thermoelectric materials, Transport theory
Journal or Publication Title:	Journal of Electronic Materials
Publisher:	Springer New York LLC
ISSN:	0361-5235
Official Date:	15 April 2019
Dates:	Date Event 15 April 2019 Published 18 December 2018 Available 3 December 2018 Accepted
Volume:	48
Page Range:	pp. 1889-1895
DOI:	10.1007/s11664-018-06857-1
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	9 January 2019
Date of first compliant Open Access:	14 January 2019
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID 678763 H2020 European Research Council http://dx.doi.org/10.13039/100010663

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