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Giant Thermoelectric Seebeck Coefficients in Tellurium Quantum Wires Formed Vertically in an Aluminum Oxide Layer by Electrical Breakdown.
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.
Afiliación
  • Park NW; Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea.
  • Kim H; Department of Physics, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju 54896, Republic of Korea.
  • Lee WY; Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea.
  • Kim GS; Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea.
  • Kang DY; School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea.
  • Kim TG; School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea.
  • Saitoh E; Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
  • Yoon YG; WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
  • Rho H; Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.
  • Lee SK; Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea.
J Phys Chem Lett ; 12(34): 8212-8219, 2021 Sep 02.
Article en En | MEDLINE | ID: mdl-34415767
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.

Texto completo: 1 Bases de datos: MEDLINE Idioma: En Revista: J Phys Chem Lett Año: 2021 Tipo del documento: Article

Texto completo: 1 Bases de datos: MEDLINE Idioma: En Revista: J Phys Chem Lett Año: 2021 Tipo del documento: Article