科学通报(英文版)2024，Vol.69Issue(11) ：1728-1737.DOI:10.1016/j.scib.2024.04.034

Realizing high-efficiency thermoelectric module by suppressing donor-like effect and improving preferred orientation in n-type Bi2(Te,Se)3

Yichen Li Shulin Bai Yi Wen Zhe Zhao Lei Wang Shibo Liu Junqing Zheng Siqi Wang Shan Liu Dezheng Gao Dongrui Liu Yingcai Zhu Qian Cao Xiang Gao Hongyao Xie Li-Dong Zhao
科学通报(英文版)2024，Vol.69Issue(11) ：1728-1737.DOI:10.1016/j.scib.2024.04.034
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Realizing high-efficiency thermoelectric module by suppressing donor-like effect and improving preferred orientation in n-type Bi2(Te,Se)3

Yichen Li 1Shulin Bai 2Yi Wen 1Zhe Zhao 1Lei Wang 1Shibo Liu 1Junqing Zheng 1Siqi Wang 1Shan Liu 1Dezheng Gao 1Dongrui Liu 1Yingcai Zhu 1Qian Cao 3Xiang Gao 4Hongyao Xie 1Li-Dong Zhao2
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作者信息

  • 1. School of Materials Science and Engineering,Beihang University,Beijing 100191,China
  • 2. School of Materials Science and Engineering,Beihang University,Beijing 100191,China;Tianmushan Laboratory,Hangzhou 311115,China
  • 3. Huabei Cooling Device Co.LTD.,Langfang 065400,China
  • 4. Center for High Pressure Science and Technology Advanced Research(HPSTAR),Beijing 100094,China
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Abstract

Thermoelectric materials have a wide range of application because they can be directly used in refriger-ation and power generation.And the Bi2Te3 stand out because of its excellent thermoelectric performance and are used in commercial thermoelectric devices.However,n-type Bi2Te3 has seriously hindered the development of Bi2Te3-based thermoelectric devices due to its weak mechanical properties and inferior thermoelectric performance.Therefore,it is urgent to develop a high-performance n-type Bi2Te3 poly-crystalline.In this work,we employed interstitial Cu and the hot deformation process to optimize the thermoelectric properties of Bi2Te2.7Se0.3,and a high-performance thermoelectric module was fabricated based on this material.Our combined theoretical and experimental effort indicates that the interstitial Cu reduce the defect density in the matrix and suppresses the donor-like effect,leading to a lattice plainifi-cation effect in the material.In addition,the two-step hot deformation process significantly improves the preferred orientation of the material and boosts the mobility.As a result,a maximum ZT of 1.27 at 373 K and a remarkable high ZTave of 1.22 across the temperature range of 300-425 K are obtained.The ther-moelectric generator(TEG,7-pair)and thermoelectric cooling(TEC,127-pair)modules were fabricated with our n-type textured Cu0.01Bi2Te2.7Se0.3 coupled with commercial p-type Bi2Te3.The TEC module demonstrates superior cooling efficiency compared with the commercial Bi2Te3 device,achieving a ΔT of 65 and 83.4 K when the hot end temperature at 300 and 350 K,respectively.In addition,the TEG mod-ule attains an impressive conversion efficiency of 6.5％at a ΔT of 225 K,which is almost the highest value among the reported Bi2Te3-based TEG modules.

Key words

Bi2Te3/Texture engineering/TEC/TEG/Donor-like effect

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基金项目

National Science Fund for Distinguished Young Scholars(51925101)

National Natural Science Foundation of China(52250090)

National Natural Science Foundation of China(52371208)

National Natural Science Foundation of China(52002042)

National Natural Science Foundation of China(51772012)

National Natural Science Foundation of China(51571007)

National Natural Science Foundation of China(12374023)

Beijing Natural Science Foundation(JO18004)

111 Project(B17002)

Tencent Xplorer Prize()

EPIC facility of Northwestern University's NUANCE Center()

出版年

2024
科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
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