# Intrinsic point defects in aluminum antimonide

D. Ã…berg,
P. Erhart,
A. J. Williamson,
and
V. Lordi

*Physical Review B* **77**, 165206
(2008)

doi: 10.1103/PhysRevB.77.165206

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Calculations within density functional theory on the basis of the local density approximation are carried out to study the properties of intrinsic point defects in aluminum antimonide. Special care is taken to address finite-size effects, band gap error, and symmetry reduction in the defect structures. The correction of the band gap is based on a set of *GW* calculations. The most important defects are identified to be the aluminum interstitial Al_{i,Al}(1+), the antimony antisites Sb_{Al}(0) and Sb_{Al}(1+), and the aluminum vacancy *V*_{Al}(3-). The intrinsic defect and charge carrier concentrations in the impurity-free material are calculated by self-consistently solving the charge neutrality equation. The impurity-free material is found to be *n*-type conducting at finite temperatures.