氧化过程及添加Zn和Te导致p型Bi2Te3热电优值的提高

IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Kazuki Imasato*, Shinichi Fujimoto*, Yu Ikuta, Masanobu Miyata, Noriyuki Saitoh, Noriko Yoshizawa, Atsushi Yamamoto, Takao Ishida, Mikio Koyano and Michihiro Ohta*, 
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引用次数: 0

摘要

迄今为止,bi2te3为基础的系统是最有前途的热电材料在室温附近的珀尔帖冷却和能量收集。为了扩大bi2te3基热电材料的应用,需要进一步提高热电性能zT。在本研究中,我们研究了氧化对p型Bi0.45Sb1.55Te3热电性能的关键作用,并提出了改善性能的方法。在组成元素的制造过程中不可避免地形成杂质氧化物,导致迁移率降低。为了解决这一问题,添加了吸氧元素Zn来捕获Bi0.45Sb1.55Te3基体中的氧气,以提高迁移率。此外,所形成的副产物ZnO能有效地同时散射载热声子。通过控制氧化过程和添加Zn和Te, Bi0.45Sb1.55Te3的zT提高了30%,同时改善了电子性能和降低了晶格导热系数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Oxidation Process and Addition of Zn and Te Lead to the Enhancement of Thermoelectric Figure of Merit in p-Type Bi2Te3

Oxidation Process and Addition of Zn and Te Lead to the Enhancement of Thermoelectric Figure of Merit in p-Type Bi2Te3

To date, Bi2Te3-based systems are the most promising thermoelectric materials near room temperature for Peltier cooling and energy harvesting. Further improvement of the thermoelectric figure of merit zT is required to broaden the application of Bi2Te3-based thermoelectrics. In this study, we investigated the critical role of oxidation in the thermoelectric performance of p-type Bi0.45Sb1.55Te3 and proposed a way to improve the performance. Impurity oxides inevitably formed during the fabrication processes of constituent elements, leading to lowered mobility. To solve this problem, an oxygen getter element, Zn, was added to capture the oxygen from the Bi0.45Sb1.55Te3 matrix to increase the mobility. Moreover, the formed byproduct ZnO effectively scattered heat-carrying phonons simultaneously. The control of the oxidation process and the addition of Zn and Te led to a 30% enhancement in the zT of Bi0.45Sb1.55Te3 with the decoupling of improved electronic properties and reduced lattice thermal conductivity.

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来源期刊
ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces 工程技术-材料科学:综合
CiteScore
16.00
自引率
6.30%
发文量
4978
审稿时长
1.8 months
期刊介绍: ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.
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