Abstract
PbTe1- xSex-2%Na-y%SrTe system is investigated and a high maximum ZT of 2.3 at 923 K for PbTe0.85Se0.15-2%Na-4%SrTe is reported. This is achieved by performing electronic band structures modifications as well as all-scale hierarchical structuring and combining the two effects. It is found that high ZTs in PbTe0.85Se0.15-2%Na-4%SrTe are possible at all temperature from 300 to 873 K with an average ZTave of 1.23. The high performance in PbTe1- xSex-2%Na-y%SrTe can be achieved by either choosing PbTe-2Na-4SrTe or PbTe0.85Se0.15-2Na as a matrix. At room temperature the carrier mobility shows negligible variations as SrTe fraction is increased, however the lattice thermal conductivity is significantly reduced from ≈1.1 to ≈0.82 W m-1 K-1 when 5.0% SrTe is added, correspondingly, the lattice thermal conductivity at 923 K decreases from ≈0.59 to ≈0.43 W m-1 K-1. The power factor maxima of PbTe1- xSex-2Na-4SrTe shift systematically to higher temperature with rising Se fractions due to bands divergence. The maximum power factors reach ≈27, ≈30, ≈31 μW cm-1 K-2 for the x = 0, 0.05, and 0.15 samples peak at 473, 573, and 623 K, respectively. The results indicate that ZT can be increased by synergistic integration of band structure engineering and all-scale hierarchical architectures.
| Original language | English |
|---|---|
| Journal | Advanced Energy Materials |
| DOIs | |
| Publication status | Accepted/In press - 2016 |
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Keywords
- All-scale hierarchical structuring
- Band structure engineering
- PbTe
- Thermoelectric
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
Cite this
Integrating Band Structure Engineering with All-Scale Hierarchical Structuring for High Thermoelectric Performance in PbTe System. / Pei, Yanling; Tan, Gangjian; Feng, Dan; Zheng, Lei; Tan, Qing; Xie, Xiaobing; Gong, Shengkai; Chen, Yue; Li, Jing Feng; He, Jiaqing; Kanatzidis, Mercouri G; Zhao, Li Dong.
In: Advanced Energy Materials, 2016.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Integrating Band Structure Engineering with All-Scale Hierarchical Structuring for High Thermoelectric Performance in PbTe System
AU - Pei, Yanling
AU - Tan, Gangjian
AU - Feng, Dan
AU - Zheng, Lei
AU - Tan, Qing
AU - Xie, Xiaobing
AU - Gong, Shengkai
AU - Chen, Yue
AU - Li, Jing Feng
AU - He, Jiaqing
AU - Kanatzidis, Mercouri G
AU - Zhao, Li Dong
PY - 2016
Y1 - 2016
N2 - PbTe1- xSex-2%Na-y%SrTe system is investigated and a high maximum ZT of 2.3 at 923 K for PbTe0.85Se0.15-2%Na-4%SrTe is reported. This is achieved by performing electronic band structures modifications as well as all-scale hierarchical structuring and combining the two effects. It is found that high ZTs in PbTe0.85Se0.15-2%Na-4%SrTe are possible at all temperature from 300 to 873 K with an average ZTave of 1.23. The high performance in PbTe1- xSex-2%Na-y%SrTe can be achieved by either choosing PbTe-2Na-4SrTe or PbTe0.85Se0.15-2Na as a matrix. At room temperature the carrier mobility shows negligible variations as SrTe fraction is increased, however the lattice thermal conductivity is significantly reduced from ≈1.1 to ≈0.82 W m-1 K-1 when 5.0% SrTe is added, correspondingly, the lattice thermal conductivity at 923 K decreases from ≈0.59 to ≈0.43 W m-1 K-1. The power factor maxima of PbTe1- xSex-2Na-4SrTe shift systematically to higher temperature with rising Se fractions due to bands divergence. The maximum power factors reach ≈27, ≈30, ≈31 μW cm-1 K-2 for the x = 0, 0.05, and 0.15 samples peak at 473, 573, and 623 K, respectively. The results indicate that ZT can be increased by synergistic integration of band structure engineering and all-scale hierarchical architectures.
AB - PbTe1- xSex-2%Na-y%SrTe system is investigated and a high maximum ZT of 2.3 at 923 K for PbTe0.85Se0.15-2%Na-4%SrTe is reported. This is achieved by performing electronic band structures modifications as well as all-scale hierarchical structuring and combining the two effects. It is found that high ZTs in PbTe0.85Se0.15-2%Na-4%SrTe are possible at all temperature from 300 to 873 K with an average ZTave of 1.23. The high performance in PbTe1- xSex-2%Na-y%SrTe can be achieved by either choosing PbTe-2Na-4SrTe or PbTe0.85Se0.15-2Na as a matrix. At room temperature the carrier mobility shows negligible variations as SrTe fraction is increased, however the lattice thermal conductivity is significantly reduced from ≈1.1 to ≈0.82 W m-1 K-1 when 5.0% SrTe is added, correspondingly, the lattice thermal conductivity at 923 K decreases from ≈0.59 to ≈0.43 W m-1 K-1. The power factor maxima of PbTe1- xSex-2Na-4SrTe shift systematically to higher temperature with rising Se fractions due to bands divergence. The maximum power factors reach ≈27, ≈30, ≈31 μW cm-1 K-2 for the x = 0, 0.05, and 0.15 samples peak at 473, 573, and 623 K, respectively. The results indicate that ZT can be increased by synergistic integration of band structure engineering and all-scale hierarchical architectures.
KW - All-scale hierarchical structuring
KW - Band structure engineering
KW - PbTe
KW - Thermoelectric
UR - http://www.scopus.com/inward/record.url?scp=84991070713&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84991070713&partnerID=8YFLogxK
U2 - 10.1002/aenm.201601450
DO - 10.1002/aenm.201601450
M3 - Article
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6832
ER -