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Enhanced stability and thermoelectric figure-of-merit in copper selenide by lithium doping

Kang, Stephen Dongmin and Pöhls, Jan-Hendrik and Aydemir, Umut and Qiu, Pengfei and Stoumpos, Constantinos C. and Hanus, Riley and White, Mary Anne and Shi, Xun and Chen, Lidong and Kanatzidis, Mercouri G. and Snyder, G. Jeffrey (2017) Enhanced stability and thermoelectric figure-of-merit in copper selenide by lithium doping. Materials Today Physics, 1 . pp. 7-13. ISSN 2542-5293. doi:10.1016/j.mtphys.2017.04.002.

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Superionic thermoelectric materials have been shown to have high figure-of-merits, leading to expectations for efficient high-temperature thermoelectric generators. These compounds exhibit extremely high cation diffusivity, comparable to that of a liquid, which is believed to be associated with the low thermal conductivity that makes superionic materials good for thermoelectrics. However, the superionic behavior causes cation migration that leads to device deterioration, being the main obstacle for practical applications. It has been reported that lithium doping in superionic Cu_(2−x)Se leads to suppression of the Cu ion diffusivity, but whether the material will retain the promising thermoelectric properties had not yet been investigated. Here, we report a maximum zT>1.4 from Li_(0.09)Cu_(1.9)Se, which is higher than what we find in the undoped samples. The high temperature effective weighted mobility of the doped sample is found higher than Cu_(2−x)Se, while the lattice thermal conductivity remains similar. We find signatures of suppressed bipolar conduction due to an enlarged band gap. Our findings set forth a possible route for tuning the stability of superionic thermoelectric materials.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kang, Stephen Dongmin0000-0002-7491-7933
Aydemir, Umut0000-0003-1164-1973
White, Mary Anne0000-0001-8142-0004
Kanatzidis, Mercouri G.0000-0003-2037-4168
Snyder, G. Jeffrey0000-0003-1414-8682
Additional Information:© 2017 Elsevier Ltd. Available online 7 June 2017. We acknowledge D. R. Brown for discussion and ideas in the early stage of the project. The authors would like to acknowledge support from the U.S. Department of Energy, Office of Science, Basic Energy Sciences through the following programs: the Solid-State Solar-Thermal Energy Conversion Center (S3TEC), an Energy Frontier Research Center (DE-SC0001299); the Advanced Photon Source at Argonne National Laboratory (DE-AC02-06CH11357); grant for C. C. S. and M. G. W. (DE-SC0014520). J. -H. P. and M. A. W. would like to acknowledge funding from the Natural Sciences and Engineering Research Council of Canada.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0001299
Department of Energy (DOE)DE-AC02-06CH11357
Department of Energy (DOE)DE-SC0014520
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Record Number:CaltechAUTHORS:20170711-094910223
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Official Citation:Stephen Dongmin Kang, Jan-Hendrik Pöhls, Umut Aydemir, Pengfei Qiu, Constantinos C. Stoumpos, Riley Hanus, Mary Anne White, Xun Shi, Lidong Chen, Mercouri G. Kanatzidis, G. Jeffrey Snyder, Enhanced stability and thermoelectric figure-of-merit in copper selenide by lithium doping, Materials Today Physics, Volume 1, June 2017, Pages 7-13, ISSN 2542-5293, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78933
Deposited By: Tony Diaz
Deposited On:11 Jul 2017 22:06
Last Modified:15 Nov 2021 17:44

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