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Quasiparticle Calculations for Point Defects at Semiconductor Surfaces

  • Arno Schindlmayr
  • Matthias Scheffler
Chapter
Part of the Topics in Applied Physics book series (TAP, volume 104)

Abstract

We present a quantitative parameter-free method for calculating defect states and charge-transition levels of point defects in semiconductors. It combines the strength of density-functional theory for ground-state total energies with quasiparticle corrections to the excitation spectrum obtained from many-body perturbation theory. The latter is implemented within the G 0 W 0 approximation, in which the electronic self-energy is constructed non-self-consistently from the Green’s function of the underlying Kohn–Sham system. The method is general and applicable to arbitrary bulk or surface defects. As an example we consider anion vacancies at the (110) surfaces of III–V semiconductors. Relative to the Kohn–Sham eigenvalues in the local-density approximation, the quasiparticle corrections open the fundamental band gap and raise the position of defect states inside the gap. As a consequence, the charge-transition levels are also pushed to higher energies, leading to close agreement with the available experimental data.

Keywords

71.10.-w 71.17.-m 71.23.-k 71.55.-i 63.20Mt 

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Authors and Affiliations

  • Arno Schindlmayr
    • 1
    • 2
  • Matthias Scheffler
    • 2
  1. 1.Forschungszentrum JülichInstitut für FestkörperforschungJülichGermany
  2. 2.Fritz-Haber-Institut der Max-Planck-GesellschaftBerlin-DahlemGermany

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