类施主效应调控与高择优取向织构提升n型Bi_(2)(Te,Se)_(3)材料热电性能  

Realizing high-efficiency thermoelectric module by suppressing donor-like effect and improving preferred orientation in n-type Bi_(2)(Te,Se)_(3)

作　　者：李奕辰 白树林 文熠 赵哲 王磊 刘世博 郑俊卿 王斯琦 刘姗 高德政 刘东锐 朱英才 曹茜 高翔 谢鸿耀 赵立东 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(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)

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [2]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

出　　处：《Science Bulletin》2024年第11期1728-1737,共10页科学通报（英文版）

基　　金：supported by the National Science Fund for Distinguished Young Scholars (51925101);the National Natural Science Foundation of China (52250090,52371208,52002042,51772012,51571007,and 12374023);Beijing Natural Science Foundation (JO18004);the 111 Project (B17002);the support from the Tencent Xplorer Prize;partially supported by the EPIC facility of Northwestern University’s NUANCE Center。

摘　　要：Thermoelectric materials have a wide range of application because they can be directly used in refrigeration and power generation. And the Bi_(2)Te_(3) stand out because of its excellent thermoelectric performance and are used in commercial thermoelectric devices. However, n-type Bi_(2)Te_(3) has seriously hindered the development of Bi_(2)Te_(3)-based thermoelectric devices due to its weak mechanical properties and inferior thermoelectric performance. Therefore, it is urgent to develop a high-performance n-type Bi_(2)Te_(3) polycrystalline. In this work, we employed interstitial Cu and the hot deformation process to optimize the thermoelectric properties of Bi_(2)Te_(2.7)Se_(0.3), 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 plainification 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 ZT_(ave) of 1.22 across the temperature range of 300–425 K are obtained. The thermoelectric generator(TEG, 7-pair) and thermoelectric cooling(TEC, 127-pair) modules were fabricated with our n-type textured Cu_(0.01)Bi_(2)Te_(2.7)Se_(0.3) coupled with commercial p-type Bi_(2)Te_(3). The TEC module demonstrates superior cooling efficiency compared with the commercial Bi_(2)Te_(3) 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 module attains an impressive conversion efficiency of 6.5% at a ΔT of 225 K, which is almost the highest value among the reported Bi_(2)Te_(3)-based TEG modules.

关 键 词：Bi_(2)Te_(3) Texture engineering TEC TEG Donor-like effect 

分 类 号：TB34[一般工业技术—材料科学与工程]