LiGa O in the spinel type structure is investigated as a potential ultra-wideband-gap semiconductor. The band structure is determined using the quasiparticle self-consistent method, and the optical properties are calculated at the Bethe Salpeter Equation level including electron-hole interaction effects. The optical gap including exciton effects and an estimate of the zero-point motion electron phonon coupling renormalizations is estimated to be about eV with an exciton binding energy of about 0.4 eV. Si doping as potential -type dopant is investigated and found to be a promising shallow donor.
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