Computational study of defect complexes in β-LiGaO2 and their relation to the donor–acceptor-pair recombination.

Hybrid functional calculations are presented for defects in LiGaO 2 with the fraction of non-local exchange adjusted to reproduce the recently reported exciton gap of 6.0 eV. We study how the defect transition levels of the main native defects change with respect to the band edges compared to earlier calculations which assumed a smaller bandgap near 5.1 eV. In addition, we consider defect complexes formed by combining the main native donor Ga Li with the main acceptors, V Li and Li Ga antisites as a function of their relative position. These results are used to tentatively identify the photoluminescence bands previously assigned to donor–acceptor-pair recombination. [ABSTRACT FROM AUTHOR]