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

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

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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.

Bi2Te3Texture engineeringTECTEGDonor-like effect

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

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School of Materials Science and Engineering,Beihang University,Beijing 100191,China

Tianmushan Laboratory,Hangzhou 311115,China

Huabei Cooling Device Co.LTD.,Langfang 065400,China

Center for High Pressure Science and Technology Advanced Research(HPSTAR),Beijing 100094,China

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National Science Fund for Distinguished Young ScholarsNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBeijing Natural Science Foundation111 ProjectTencent Xplorer PrizeEPIC facility of Northwestern University's NUANCE Center

51925101522500905237120852002042517720125157100712374023JO18004B17002

2024

10.1016/j.scib.2024.04.034

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(11)