Enhanced Thermoelectric Performance of Cu-incorporated Bi0.5Sb1.5Te3 by Melt Spinning and Spark Plasma Sintering
- Authors
- Cho, Hyun-jun; Kim, Hyun-sik; Kim, Minyoung; Lee, Kyu Hyoung; Kim, Sung Wng; Kim, Sang-il
- Issue Date
- May-2020
- Publisher
- SPRINGER
- Keywords
- Thermoelectric; Cu-incorporation; Bi-0; 5Sb(1); 5Te(3); melt spinning; spark plasma sintering
- Citation
- JOURNAL OF ELECTRONIC MATERIALS, v.49, no.5, pp.2789 - 2793
- Journal Title
- JOURNAL OF ELECTRONIC MATERIALS
- Volume
- 49
- Number
- 5
- Start Page
- 2789
- End Page
- 2793
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/10978
- DOI
- 10.1007/s11664-019-07772-9
- ISSN
- 0361-5235
- Abstract
- Incorporation of a foreign element is considered as a promising approach to enhance the performance of thermoelectric materials since this can either improve the power factor by a band structure modification or reduce the thermal conductivity by a phonon scattering strengthening. We fabricated the polycrystalline bulk samples of Cu-incorporated Bi0.5Sb1.5Te3 by melt spinning and spark plasma sintering, and evaluated the electronic and thermal transport properties. From the phase analysis and thermoelectric properties measurement, we found that most of the added excess Cu atoms were substituted at a Sb-site and a small amount of Cu was intercalated at the van der Waals gap between quintuple layers. By the formation of two different point defects (substituted Cu and intercalated Cu), the thermoelectric power factor was enhanced because of the increased density of states effective mass, and simultaneously reduced thermal conductivity originated from the intensified phonon scattering and suppressed bipolar contribution. Maximum thermoelectric figure of merit zT of 1.13 was obtained at 400 K.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.