高压制备n型碲化铋基多孔材料及其热电性能优化  

Preparation of n-type Bismuth Telluride Based Porous Materials under High Pressure and Optimization of Its Thermoelectric Properties

作　　者：单蕾佳 李苗 丁战辉[1] 周悦 佘雅琪 王宇轩 李永峰[1] 姚斌[1] SHAN Leijia;LI Miao;DING Zhanhui;ZHOU Yue;SHE Yaqi;WANG Yuxuan;LI Yongfeng;YAO Bin(Jilin University,Changchun 130012,China)

机构地区：[1]吉林大学物理学院,长春130012

出　　处：《沈阳理工大学学报》2025年第3期67-72,共6页Journal of Shenyang Ligong University

基　　金：吉林省自然科学基金项目(20240101327JC);国家自然科学基金项目(12274304)。

摘　　要：碲化铋(Bi2Te3)基复合材料是目前热电性能最好的近室温热电材料,然而n型Bi2(Se,Te)3块材的热电优值(zT值)滞后于p型(Bi,Sb)2Te3材料,进一步提升n型Bi2Te3基复合材料的zT值对热电器件的发展和应用至关重要。本研究以氯化钾(KCl)为造孔剂,采用高压法制备出Bi2(Te,Se)3-KCl致密块体,经超声水洗除去造孔剂KCl颗粒后形成纳米或亚微米孔洞结构。实验结果表明,多孔样品的电输运性能略有下降,但热导率显著降低,热电性能得到有效提升。本研究工作对开发高性能多孔热电材料具有一定参考价值。Bismuth telluride(Bi2Te3)-based composites are currently the best thermoelectric materi-als near room temperature.However,the thermoelectric figure of merit(zT value)of n-type Bi2(Se,Te)3 lags behind that of p-type(Bi,Sb)2Te3 materials.Enhancing zT value of n-type Bi2Te3-based composites is essential for the advancement and application of thermoelectric devices.In this study,potassium chloride(KCl)was used as the pore-forming agent,and Bi2(Te,Se)3-KCl dense blocks were prepared by high-pressure synthesis method.After ultrasonic washing to remove the KCl parti-cles,nanometer or submicron pores were formed.The results show that the electrical transport per-formance of the porous sample decreases slightly,but the thermal conductivity decreases significant-ly,effectively improving the thermoelectric performance.This work has reference value for the de-velopment of high-performance porous thermoelectric materials.

关 键 词：热电材料 热电性能 BI2TE3 多孔结构 高压高温 

分 类 号：O472[理学—半导体物理] O521[理学—物理]