Non-equilibrium processing leads to record high thermoelectric figure of merit in PbTe–SrTe
Abstract
The broad-based implementation of thermoelectric materials in converting heat to electricity hinges on the achievement of high conversion efficiency. Here we demonstrate a thermoelectric figure of merit ZT of 2.5 at 923 K by the cumulative integration of several performance-enhancing concepts in a single material system. Using non-equilibrium processing we show that hole-doped samples of PbTe can be heavily alloyed with SrTe well beyond its thermodynamic solubility limit of <1 mol%. The much higher levels of Sr alloyed into the PbTe matrix widen the bandgap and create convergence of the two valence bands of PbTe, greatly boosting the power factors with maximal values over 30 μWcm -1 K -2. Exceeding the 5 mol% solubility limit leads to endotaxial SrTe nanostructures which produce extremely low lattice thermal conductivity of 0.5 Wm -1 K -1 but preserve high hole mobilities because of the matrix/precipitate valence band alignment. The best composition is hole-doped PbTe-8% SrTe.
- Authors:
-
- Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
- Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
- Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Beihang Univ., Beijing (China). School of Materials Science and Engineering
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
- Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences and Engineering Division
- OSTI Identifier:
- 1326596
- Grant/Contract Number:
- AC02-06CH11357; SC0014520
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 7; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Tan, Gangjian, Shi, Fengyuan, Hao, Shiqiang, Zhao, Li-Dong, Chi, Hang, Zhang, Xiaomi, Uher, Ctirad, Wolverton, Chris, Dravid, Vinayak P., and Kanatzidis, Mercouri G. Non-equilibrium processing leads to record high thermoelectric figure of merit in PbTe–SrTe. United States: N. p., 2016.
Web. doi:10.1038/ncomms12167.
Tan, Gangjian, Shi, Fengyuan, Hao, Shiqiang, Zhao, Li-Dong, Chi, Hang, Zhang, Xiaomi, Uher, Ctirad, Wolverton, Chris, Dravid, Vinayak P., & Kanatzidis, Mercouri G. Non-equilibrium processing leads to record high thermoelectric figure of merit in PbTe–SrTe. United States. https://doi.org/10.1038/ncomms12167
Tan, Gangjian, Shi, Fengyuan, Hao, Shiqiang, Zhao, Li-Dong, Chi, Hang, Zhang, Xiaomi, Uher, Ctirad, Wolverton, Chris, Dravid, Vinayak P., and Kanatzidis, Mercouri G. Tue .
"Non-equilibrium processing leads to record high thermoelectric figure of merit in PbTe–SrTe". United States. https://doi.org/10.1038/ncomms12167. https://www.osti.gov/servlets/purl/1326596.
@article{osti_1326596,
title = {Non-equilibrium processing leads to record high thermoelectric figure of merit in PbTe–SrTe},
author = {Tan, Gangjian and Shi, Fengyuan and Hao, Shiqiang and Zhao, Li-Dong and Chi, Hang and Zhang, Xiaomi and Uher, Ctirad and Wolverton, Chris and Dravid, Vinayak P. and Kanatzidis, Mercouri G.},
abstractNote = {The broad-based implementation of thermoelectric materials in converting heat to electricity hinges on the achievement of high conversion efficiency. Here we demonstrate a thermoelectric figure of merit ZT of 2.5 at 923 K by the cumulative integration of several performance-enhancing concepts in a single material system. Using non-equilibrium processing we show that hole-doped samples of PbTe can be heavily alloyed with SrTe well beyond its thermodynamic solubility limit of <1 mol%. The much higher levels of Sr alloyed into the PbTe matrix widen the bandgap and create convergence of the two valence bands of PbTe, greatly boosting the power factors with maximal values over 30 μWcm -1 K -2. Exceeding the 5 mol% solubility limit leads to endotaxial SrTe nanostructures which produce extremely low lattice thermal conductivity of 0.5 Wm -1 K -1 but preserve high hole mobilities because of the matrix/precipitate valence band alignment. The best composition is hole-doped PbTe-8% SrTe.},
doi = {10.1038/ncomms12167},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Tue Jul 26 00:00:00 EDT 2016},
month = {Tue Jul 26 00:00:00 EDT 2016}
}
Web of Science
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