Isotope composition dependence of the band-gap energy in diamond

H. Watanabe, T. Koretsune, S. Nakashima, S. Saito, S. Shikata

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

We present experimental results on the band-gap energies of homoepitaxial diamond films with isotopic compositions ranging from nearly pure carbon-12 (12C) to nearly pure carbon-13 (13C). Diamond crystals were grown by microwave plasma-assisted chemical vapor deposition, which controls the isotope composition and minimizes the density of impurities and defects. We find that the isotope substitution of 12C by 13C increases the band-gap energy in diamond by up to 15.4 meV at 79 K. The increase at room temperature is estimated from the temperature dependence of the band-gap renormalization due to electron-phonon interaction and is found to be even larger than that at low temperatures. These results unambiguously demonstrate the possibility of band-gap engineering of diamond via control of the isotopic composition.

Original languageEnglish
Article number205420
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number20
DOIs
Publication statusPublished - 2013 Nov 21
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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