High-temperature thermoelectric properties of Cu1.97Ag0.03Se1+y

Tristan W. Day; Kasper A. Borup; Tiansong Zhang; Fivos Drymiotis; David R. Brown; Xun Shi; Lidong Chen; Bo B. Iversen; G. Jeffrey Snyder

doi:10.1007/s40243-014-0026-5

High-temperature thermoelectric properties of Cu_1.97Ag_0.03Se_1+y

Tristan W. Day, Kasper A. Borup, Tiansong Zhang, Fivos Drymiotis, David R. Brown, Xun Shi, Lidong Chen, Bo B. Iversen, G. Jeffrey Snyder^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

Copper selenide is of recent interest as a high-performance p-type thermoelectric material. Adding Ag to copper selenide increases the dimensionless figure-of-merit zT up to 780 K, with Cu_1.97Ag_0.03Se reaching a zT of 1.0 at 870 K. The increase compared with Cu₂Se can be explained by analyzing the Hall carrier concentration and effective mass. Addition of Ag reduces the carrier concentration to a nearly optimum value at high temperature. If the Hall carrier concentration were to be further reduced to 6.6 × 10²⁰ cm^-3 at 750 K, the average zT would be substantially improved for waste heat recovery applications.

Original language	English (US)
Article number	26
Journal	Materials for Renewable and Sustainable Energy
Volume	3
Issue number	2
DOIs	https://doi.org/10.1007/s40243-014-0026-5
State	Published - Jun 1 2014

Keywords

Carrier concentration optimization
Copper selenide
CuAgSe
Thermoelectrics

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Fuel Technology
Materials Chemistry

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title = "High-temperature thermoelectric properties of Cu1.97Ag0.03Se1+y",

abstract = "Copper selenide is of recent interest as a high-performance p-type thermoelectric material. Adding Ag to copper selenide increases the dimensionless figure-of-merit zT up to 780 K, with Cu1.97Ag0.03Se reaching a zT of 1.0 at 870 K. The increase compared with Cu2Se can be explained by analyzing the Hall carrier concentration and effective mass. Addition of Ag reduces the carrier concentration to a nearly optimum value at high temperature. If the Hall carrier concentration were to be further reduced to 6.6 × 1020 cm-3 at 750 K, the average zT would be substantially improved for waste heat recovery applications.",

keywords = "Carrier concentration optimization, Copper selenide, CuAgSe, Thermoelectrics",

author = "Day, {Tristan W.} and Borup, {Kasper A.} and Tiansong Zhang and Fivos Drymiotis and Brown, {David R.} and Xun Shi and Lidong Chen and Iversen, {Bo B.} and Snyder, {G. Jeffrey}",

note = "Funding Information: Acknowledgments T.W.D. and G.J.S. thank the U.S. Air Force Office of Scientific Research for support. T.W.D. thanks Heng Wang for help with the dimensionless quality factor. T.Z., X.S., and L.C. thank for financial support the National Basic Research Program of China (973-program) under Project No. 2013CB632501 and National Natural Science of Foundation of China (NSFC) under Project No. 51222209. K.A.B. and B.B.I. thank the Danish National Research Foundation (DNRF93). Publisher Copyright: {\textcopyright} 2014 The Author(s).",

year = "2014",

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day = "1",

doi = "10.1007/s40243-014-0026-5",

language = "English (US)",

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journal = "Materials for Renewable and Sustainable Energy",

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T1 - High-temperature thermoelectric properties of Cu1.97Ag0.03Se1+y

AU - Day, Tristan W.

AU - Borup, Kasper A.

AU - Zhang, Tiansong

AU - Drymiotis, Fivos

AU - Brown, David R.

AU - Shi, Xun

AU - Chen, Lidong

AU - Iversen, Bo B.

AU - Snyder, G. Jeffrey

N1 - Funding Information: Acknowledgments T.W.D. and G.J.S. thank the U.S. Air Force Office of Scientific Research for support. T.W.D. thanks Heng Wang for help with the dimensionless quality factor. T.Z., X.S., and L.C. thank for financial support the National Basic Research Program of China (973-program) under Project No. 2013CB632501 and National Natural Science of Foundation of China (NSFC) under Project No. 51222209. K.A.B. and B.B.I. thank the Danish National Research Foundation (DNRF93). Publisher Copyright: © 2014 The Author(s).

PY - 2014/6/1

Y1 - 2014/6/1

N2 - Copper selenide is of recent interest as a high-performance p-type thermoelectric material. Adding Ag to copper selenide increases the dimensionless figure-of-merit zT up to 780 K, with Cu1.97Ag0.03Se reaching a zT of 1.0 at 870 K. The increase compared with Cu2Se can be explained by analyzing the Hall carrier concentration and effective mass. Addition of Ag reduces the carrier concentration to a nearly optimum value at high temperature. If the Hall carrier concentration were to be further reduced to 6.6 × 1020 cm-3 at 750 K, the average zT would be substantially improved for waste heat recovery applications.

AB - Copper selenide is of recent interest as a high-performance p-type thermoelectric material. Adding Ag to copper selenide increases the dimensionless figure-of-merit zT up to 780 K, with Cu1.97Ag0.03Se reaching a zT of 1.0 at 870 K. The increase compared with Cu2Se can be explained by analyzing the Hall carrier concentration and effective mass. Addition of Ag reduces the carrier concentration to a nearly optimum value at high temperature. If the Hall carrier concentration were to be further reduced to 6.6 × 1020 cm-3 at 750 K, the average zT would be substantially improved for waste heat recovery applications.

KW - Carrier concentration optimization

KW - Copper selenide

KW - CuAgSe

KW - Thermoelectrics

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