Electronic, optical, and thermoelectric properties of bulk and monolayer germanium tellurides

Wenny V. Sinambela, Sasfan A. Wella, Fitri S. Arsyad, Nguyen Tuan Hung, Ahmad R.T. Nugraha

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Electronic, optical, and thermoelectric properties of germanium tellurides (GeTe) were investigated through a series of first-principles calculations of band structures, absorption coefficients, and thermoelectric transport coefficients. We consider bulk GeTe to consist of cubic and rhombohedral phases, while the two-dimensional (2D) GeTe monolayers can form as a 2D puckered or buckled honeycomb crystals. All of the GeTe variants in the bulk and monolayer shapes are excellent light absorbers in a wide frequency range: (1) bulk cubic GeTe in the near-infrared regime, (2) bulk rhombohedral GeTe and puckered monolayer GeTe in the visible-light regime, and (3) buckled monolayer GeTe in the ultraviolet regime. We also found specifically that the buckled monolayer GeTe exhibits remarkable thermoelectric performance compared to the other GeTe phases due to a combination of electronic band convergence, a moderately wide band gap, and unique 2D density of states from the quantum confinement effect.

Original languageEnglish
Article number1290
Issue number11
Publication statusPublished - 2021 Nov
Externally publishedYes


  • Electronic properties
  • First-principles calculation
  • Germanium telluride
  • Group-IV tellurides
  • Optical properties
  • Thermoelectric properties

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry


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