Important role of Cu in suppressing bipolar conduction in Bi-rich (Bi,Sb)(2)Te-3
- Authors
- Lee, Kyu Hyoung; Shin, Weon Ho; Kim, Hyun-Sik; Cho, Hyun-joon; Kim, Sung Wng; Kim, Sang-il
- Issue Date
- Sep-2020
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Thermoelectric; Bipolar conduction; Doping; Effective mass; Weighted mobility
- Citation
- SCRIPTA MATERIALIA, v.186, pp.225 - 229
- Journal Title
- SCRIPTA MATERIALIA
- Volume
- 186
- Start Page
- 225
- End Page
- 229
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/11584
- DOI
- 10.1016/j.scriptamat.2020.05.039
- ISSN
- 1359-6462
- Abstract
- Cu doping has been known to enhance thermoelectric performance of p-type (Bi,Sb)(2)Te-3 alloys by suppressing bipolar conduction at higher temperatures. However, detailed mechanisms are not provided yet. Herein, we investigate the unchallenged role of Cu doping in (Bi,Sb)(2)Te-3 alloys by means of Bi-rich compositions of Bi0.6Sb1.4Te3 and Bi0.7Sb1.3Te3, which were chosen since they exhibit much inferior thermoelectric performance owing to severe bipolar conduction. It was found that Cu doping increases non-degenerate mobility and density-of-states effective mass of valence band as well as hole concentration. Small amount of Cu doping enhanced maximum thermoelectric figure-of-merit of Bi0.6Sb1.4Te3 composition from 0.25 to 0.98. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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