Abstract
Single crystalline SnSe is one of the most intriguing new thermoelectric materials but the thermoelectric performance of polycrystalline SnSe seems to lag significantly compared to that of a single crystal. Here an effective strategy for enhancing the thermoelectric performance of p-type polycrystalline SnSe by Ag/Na dual-doping and Ag8SnSe6 (STSe) nanoprecipitates is reported. The Ag/Na dual-doping leads to a two orders of magnitude increase in carrier concentration and a convergence of valence bands (VBM1 and VBM5), which in turn results in sharp enhancement of electrical conductivities and high Seebeck coefficients in the Ag/Na dual-doped samples. Additionally, the SnSe matrix becomes nanostructured with dispersed nanoprecipitates of the compound Ag8SnSe6, which further strengthens the scattering of phonons. Specifically, ≈20% reduction in the already ultralow lattice thermal conductivity is realized for the Sn0.99Na0.01Se–STSe sample at 773 K compared to the thermal conductivity of pure SnSe. Consequently, a peak thermoelectric figure of merit ZT of 1.33 at 773 K with a high average ZT (ZTave) value of 0.91 (423–823 K) is achieved for the Sn0.99Na0.01Se–STSe sample.
| Original language | English |
|---|---|
| Article number | 1803072 |
| Journal | Advanced Energy Materials |
| DOIs | |
| Publication status | Accepted/In press - Jan 1 2018 |
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Keywords
- AgSnSe
- dual-doping
- nanostructuring
- SnSe
- thermoelectrics
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
Cite this
High Thermoelectric Performance in Polycrystalline SnSe Via Dual-Doping with Ag/Na and Nanostructuring With Ag8SnSe6 . / Luo, Yubo; Cai, Songting; Hua, Xia; Chen, Haijie; Liang, Qinghua; Du, Chengfeng; Zheng, Yun; Shen, Junhua; Xu, Jianwei; Wolverton, Chris; Dravid, Vinayak P.; Yan, Qingyu; Kanatzidis, Mercouri G.
In: Advanced Energy Materials, 01.01.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - High Thermoelectric Performance in Polycrystalline SnSe Via Dual-Doping with Ag/Na and Nanostructuring With Ag8SnSe6
AU - Luo, Yubo
AU - Cai, Songting
AU - Hua, Xia
AU - Chen, Haijie
AU - Liang, Qinghua
AU - Du, Chengfeng
AU - Zheng, Yun
AU - Shen, Junhua
AU - Xu, Jianwei
AU - Wolverton, Chris
AU - Dravid, Vinayak P.
AU - Yan, Qingyu
AU - Kanatzidis, Mercouri G
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Single crystalline SnSe is one of the most intriguing new thermoelectric materials but the thermoelectric performance of polycrystalline SnSe seems to lag significantly compared to that of a single crystal. Here an effective strategy for enhancing the thermoelectric performance of p-type polycrystalline SnSe by Ag/Na dual-doping and Ag8SnSe6 (STSe) nanoprecipitates is reported. The Ag/Na dual-doping leads to a two orders of magnitude increase in carrier concentration and a convergence of valence bands (VBM1 and VBM5), which in turn results in sharp enhancement of electrical conductivities and high Seebeck coefficients in the Ag/Na dual-doped samples. Additionally, the SnSe matrix becomes nanostructured with dispersed nanoprecipitates of the compound Ag8SnSe6, which further strengthens the scattering of phonons. Specifically, ≈20% reduction in the already ultralow lattice thermal conductivity is realized for the Sn0.99Na0.01Se–STSe sample at 773 K compared to the thermal conductivity of pure SnSe. Consequently, a peak thermoelectric figure of merit ZT of 1.33 at 773 K with a high average ZT (ZTave) value of 0.91 (423–823 K) is achieved for the Sn0.99Na0.01Se–STSe sample.
AB - Single crystalline SnSe is one of the most intriguing new thermoelectric materials but the thermoelectric performance of polycrystalline SnSe seems to lag significantly compared to that of a single crystal. Here an effective strategy for enhancing the thermoelectric performance of p-type polycrystalline SnSe by Ag/Na dual-doping and Ag8SnSe6 (STSe) nanoprecipitates is reported. The Ag/Na dual-doping leads to a two orders of magnitude increase in carrier concentration and a convergence of valence bands (VBM1 and VBM5), which in turn results in sharp enhancement of electrical conductivities and high Seebeck coefficients in the Ag/Na dual-doped samples. Additionally, the SnSe matrix becomes nanostructured with dispersed nanoprecipitates of the compound Ag8SnSe6, which further strengthens the scattering of phonons. Specifically, ≈20% reduction in the already ultralow lattice thermal conductivity is realized for the Sn0.99Na0.01Se–STSe sample at 773 K compared to the thermal conductivity of pure SnSe. Consequently, a peak thermoelectric figure of merit ZT of 1.33 at 773 K with a high average ZT (ZTave) value of 0.91 (423–823 K) is achieved for the Sn0.99Na0.01Se–STSe sample.
KW - AgSnSe
KW - dual-doping
KW - nanostructuring
KW - SnSe
KW - thermoelectrics
UR - http://www.scopus.com/inward/record.url?scp=85057548735&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85057548735&partnerID=8YFLogxK
U2 - 10.1002/aenm.201803072
DO - 10.1002/aenm.201803072
M3 - Article
AN - SCOPUS:85057548735
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6832
M1 - 1803072
ER -