{"title":"氧化过程及添加Zn和Te导致p型Bi2Te3热电优值的提高","authors":"Kazuki Imasato*, Shinichi Fujimoto*, Yu Ikuta, Masanobu Miyata, Noriyuki Saitoh, Noriko Yoshizawa, Atsushi Yamamoto, Takao Ishida, Mikio Koyano and Michihiro Ohta*, ","doi":"10.1021/acsami.5c0206710.1021/acsami.5c02067","DOIUrl":null,"url":null,"abstract":"<p >To date, Bi<sub>2</sub>Te<sub>3</sub>-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 <i>zT</i> is required to broaden the application of Bi<sub>2</sub>Te<sub>3</sub>-based thermoelectrics. In this study, we investigated the critical role of oxidation in the thermoelectric performance of p-type Bi<sub>0.45</sub>Sb<sub>1.55</sub>Te<sub>3</sub> 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 Bi<sub>0.45</sub>Sb<sub>1.55</sub>Te<sub>3</sub> 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 <i>zT</i> of Bi<sub>0.45</sub>Sb<sub>1.55</sub>Te<sub>3</sub> with the decoupling of improved electronic properties and reduced lattice thermal conductivity.</p>","PeriodicalId":5,"journal":{"name":"ACS Applied Materials & Interfaces","volume":"17 17","pages":"25478–25488 25478–25488"},"PeriodicalIF":8.2000,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Oxidation Process and Addition of Zn and Te Lead to the Enhancement of Thermoelectric Figure of Merit in p-Type Bi2Te3\",\"authors\":\"Kazuki Imasato*, Shinichi Fujimoto*, Yu Ikuta, Masanobu Miyata, Noriyuki Saitoh, Noriko Yoshizawa, Atsushi Yamamoto, Takao Ishida, Mikio Koyano and Michihiro Ohta*, \",\"doi\":\"10.1021/acsami.5c0206710.1021/acsami.5c02067\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >To date, Bi<sub>2</sub>Te<sub>3</sub>-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 <i>zT</i> is required to broaden the application of Bi<sub>2</sub>Te<sub>3</sub>-based thermoelectrics. In this study, we investigated the critical role of oxidation in the thermoelectric performance of p-type Bi<sub>0.45</sub>Sb<sub>1.55</sub>Te<sub>3</sub> 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 Bi<sub>0.45</sub>Sb<sub>1.55</sub>Te<sub>3</sub> 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 <i>zT</i> of Bi<sub>0.45</sub>Sb<sub>1.55</sub>Te<sub>3</sub> with the decoupling of improved electronic properties and reduced lattice thermal conductivity.</p>\",\"PeriodicalId\":5,\"journal\":{\"name\":\"ACS Applied Materials & Interfaces\",\"volume\":\"17 17\",\"pages\":\"25478–25488 25478–25488\"},\"PeriodicalIF\":8.2000,\"publicationDate\":\"2025-04-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Applied Materials & Interfaces\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acsami.5c02067\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Materials & Interfaces","FirstCategoryId":"88","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsami.5c02067","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
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.
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.