Integrating Band Structure Engineering with All-Scale Hierarchical Structuring for High Thermoelectric Performance in PbTe System

Yanling Pei, Gangjian Tan, Dan Feng, Lei Zheng, Qing Tan, Xiaobing Xie, Shengkai Gong, Yue Chen, Jing Feng Li, Jiaqing He, Mercouri G Kanatzidis, Li Dong Zhao

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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 languageEnglish
JournalAdvanced Energy Materials
DOIs
Publication statusAccepted/In press - 2016

Fingerprint

Band structure
Thermal conductivity
Carrier mobility
Temperature

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 journalArticle

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. / Integrating Band Structure Engineering with All-Scale Hierarchical Structuring for High Thermoelectric Performance in PbTe System. In: Advanced Energy Materials. 2016.
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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.",
keywords = "All-scale hierarchical structuring, Band structure engineering, PbTe, Thermoelectric",
author = "Yanling Pei and Gangjian Tan and Dan Feng and Lei Zheng and Qing Tan and Xiaobing Xie and Shengkai Gong and Yue Chen and Li, {Jing Feng} and Jiaqing He and Kanatzidis, {Mercouri G} and Zhao, {Li Dong}",
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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

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