Stability of native defects in hexagonal and cubic boron nitride

Walter Orellana, H. Chacham

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

145 Citas (Scopus)

Resumen

We investigate, through first-principles calculations, the stability and electronic structure of self-interstitials and vacancies in both hexagonal (graphite-like) and cubic boron nitride. We find that the self-interstitials Ni and Bi in hexagonal boron nitride (h-BN) have low formation energies, comparable to those of the vacancies VN and VB. For instance, we find that Ni is the most stable defect in h-BN under N-rich and p-type conditions followed by the nitrogen vacancy. This is consistent with experimental findings of large concentrations of nitrogen interstitials and vacancies, and of the trapping of nitrogen in the hexagonal phase of BN thin films grown by ion-bombardment assisted deposition techniques. In contrast, in cubic boron nitride (c-BN) the self-interstitials have high formation energies as compared to those of the vacancies. As a consequence, the formation of vacancy-interstitial pairs in kickout processes would typically require much more energy in c-BN than in h-BN. This suggests that a possible role of the ion bombardment in favoring the growth of c-BN films is to generate a much larger amount of defects in the hexagonal phase than in the cubic phase.

Idioma originalInglés
Número de artículo125205
Páginas (desde-hasta)1252051-1252057
Número de páginas7
PublicaciónPhysical Review B - Condensed Matter and Materials Physics
Volumen63
N.º12
DOI
EstadoPublicada - 2001

Áreas temáticas de ASJC Scopus

  • Materiales electrónicos, ópticos y magnéticos
  • Física de la materia condensada

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