Structural stability and electronic property evaluations for different Bi2Te3 (0 0 1) termination surfaces

Masayuki Morimoto, Shoya Kawano, Koji Miyazaki, Satoshi Iikubo

Research output: Contribution to journalArticlepeer-review

Abstract

For thermoelectric materials, the figure of merit depends on the nanostructure, morphology, element doping, and the structure of the interface with other materials. Control of this interface is important in relation to a wide range of thermoelectric material designs such as in organic–inorganic hybrid compounds. Therefore, we evaluated the ease of forming various Bi2Te3 (0 0 1) termination surfaces using formation energy and calculation of phonon dispersion after structure optimization; TeI-1 and TeII terminations exhibited static and dynamic stabilities within various termination structures. In density-of-state and charge-distribution calculations, the TeII termination form exhibited distinctive electronic states around the Fermi energy that originated from the exposed Te atoms; therefore, it is suggested that efficient carrier transfer shall occur at the interface between a TeII surface and another material.

Original languageEnglish
Article number146454
JournalApplied Surface Science
Volume525
DOIs
Publication statusPublished - Sep 30 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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