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We investigated the effect of post-deposition annealing on the electrical characteristics of SiO2/β-Ga2O3(001) MOS structures. While oxygen annealing effectively improves the interface properties, it induces acceptor defects in Ga2O3, leading to a decrease in net donor density. With the combination of oxygen and nitrogen annealing, carrier compensation was suppressed, and a low interface state density of about 1 × 1011 cm−2 eV−1 was obtained near the conduction band edge of Ga2O3. High immunity against positive gate bias stress was also confirmed.
Kobayashi et al. (Mon,) studied this question.
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