Band offsets at the Si/SiO2 interface from many-body perturbation theory

R. Shaltaf, G. M. Rignanese, X. Gonze, Feliciano Giustino, Alfredo Pasquarello

Research output: Contribution to journalArticlepeer-review

142 Citations (Scopus)

Abstract

We use many-body perturbation theory, the state-of-the-art method for band-gap calculations, to compute the band offsets at the Si/SiO2 interface. We examine the adequacy of the usual approximations in this context. We show that (i) the separate treatment of band structure and potential lineup contributions, the latter being evaluated within density-functional theory, is justified, (ii) most plasmon-pole models lead to inaccuracies in the absolute quasiparticle corrections, (iii) vertex corrections can be neglected, and (iv) eigenenergy self-consistency is adequate. Our theoretical offsets agree with the experimental ones within 0.3 eV.

Original languageEnglish
Article number186401
JournalPhysical Review Letters
Volume100
Issue number18
DOIs
Publication statusPublished - 5 May 2008
Externally publishedYes

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