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Synergistic Manipulation of Interdependent Thermoelectric Parameters in SnTe–AgBiTe2Alloys by Mn Doping
- Source :
- ACS Applied Materials & Interfaces; June 2022, Vol. 14 Issue: 25 p29032-29038, 7p
- Publication Year :
- 2022
-
Abstract
- In the mid-temperature region, SnTe is a promising substitute for PbTe, whereas the thermoelectric (TE) property of pristine SnTe is severely limited by the good thermal conductivity and inferior Seebeck coefficient. In this research, we synergistically manipulate the interdependent TE parameters of SnTe–AgBiTe2alloys by Mn doping to increase the ZTvalue. The AgBiTe2alloying is found to greatly reduce the electrical conductivity and electronic contribution for thermal transport by reducing the carrier mobility, while Mn doping obviously improves the Seebeck coefficient by effectively decreasing the valence band offset. The lowest κlof Mn-doped SnTe–AgBiTe2alloys is 0.49 W m–1K–1at 823 K since the various defects strengthen the phonon scattering. Collectively, these manipulations yield a peak ZTvalue of 1.40 at 823 K and an average ZTvalue of 0.73 (300–823 K) in the Mn-doped SnTe–AgBiTe2alloys. This research suggests that Mn doping is a valid scheme to constantly improve the thermoelectric property of SnTe–AgBiTe2alloys in a wide temperature range.
Details
- Language :
- English
- ISSN :
- 19448244
- Volume :
- 14
- Issue :
- 25
- Database :
- Supplemental Index
- Journal :
- ACS Applied Materials & Interfaces
- Publication Type :
- Periodical
- Accession number :
- ejs59950704
- Full Text :
- https://doi.org/10.1021/acsami.2c07548