Vacancies and defect levels in III-V semiconductors
- Citation data:
Journal of Applied Physics, ISSN: 0021-8979, Vol: 114, Issue: 6
- Publication Year:
- Udo Schwingenschlogl
- Physics and Astronomy
Using electronic structure calculations, we systematically investigate the formation of vacancies in III-V semiconductors (III = Al, Ga, and In and V = P, As, and Sb), for a range of charges (- 3 ≤ q ≤ 3) as a function of the Fermi level and under different growth conditions. The formation energies were corrected using the scheme due to Freysoldt [Phys. Rev. Lett. 102, 016402 (2009)] to account for finite size effects. Vacancy formation energies were found to decrease as the size of the group V atom increased. This trend was maintained for Al-V, Ga-V, and In-V compounds. The negative-U effect was only observed for the arsenic vacancy in GaAs, which makes a charge state transition from +1 to -1. It is also found that even under group III rich conditions, group III vacancies dominate in AlSb and GaSb. For InSb, group V vacancies are favoured even under group V rich conditions. © 2013 AIP Publishing LLC.