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© 2020 IOP Publishing Ltd.GaSe is a layered semiconductor with an optical band gap tunable by how many levels in a thin movie. This really is encouraging for application in micro/optoelectronics and photovoltaics. But, for the, understanding of the intrinsic flaws are essential, since they may influence product behavior. Here we present a comprehensive research of intrinsic point defects in both volume and monolayer (ML) GaSe, using an optimized hybrid functional which reproduce