Giant Thermoelectric Seebeck Coefficients in Tellurium Quantum Wires Formed Vertically in an Aluminum Oxide Layer by Electrical Breakdown
- Authors
- Park, No-Won; Kim, Hanul; Lee, Won-Yong; Kim, Gil-Sung; Kang, Dae Yun; Kim, Tae Geun; Saitoh, Eiji; Yoon, Young-Gui; Rho, Heesuk; Lee, Sang-Kwon
- Issue Date
- Sep-2021
- Publisher
- American Chemical Society
- Citation
- Journal of Physical Chemistry Letters, v.12, no.34, pp 8212 - 8219
- Pages
- 8
- Journal Title
- Journal of Physical Chemistry Letters
- Volume
- 12
- Number
- 34
- Start Page
- 8212
- End Page
- 8219
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/49138
- DOI
- 10.1021/acs.jpclett.1c01842
- ISSN
- 1948-7185
- Abstract
- High efficiency thermoelectric (TE) materials still require high thermopower for energy harvesting applications. A simple elemental metallic semiconductor, tellurium (Te), has been considered critical to realize highly efficient TE conversion due to having a large effective band valley degeneracy. This paper demonstrates a novel approach to directly probe the out-of-plane Seebeck coefficient for one-dimensional Te quantum wires (QWs) formed locally in the aluminum oxide layer by well-controlled electrical breakdown at 300 K. Surprisingly, the out-of-plane Seebeck coefficient for these Te QWs ≈ 0.8 mV/K at 300 K. This thermopower enhancement for Te QWs is due to Te intrinsic nested band structure and enhanced energy filtering at Te/AO interfaces. Theoretical calculations support the enhanced high Seebeck coefficient for elemental Te QWs in the oxide layer. The local-probed observation and detecting methodology used here offers a novel route to designing enhanced thermoelectric materials and devices in the future. © 2021 American Chemical Society.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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