Patent ID: 8815717
Filing Date: 2014-08-26
Classification: C23C,H01L

Abstract:
1. A vapor deposition method for forming a nitride semiconductor crystal layer on a substrate disposed in a reaction chamber by supplying a group III source-material gas and a group V source-material gas into the reaction chamber from a plurality of outlets, the method comprising: growing a first semiconductor crystal layer comprising a nitride semiconductor having a compositional proportion of Al in group III elements of not less than 10 atomic percent by supplying a first gas flow comprising the group III source-material gas toward the substrate from a first outlet and by supplying a second gas flow comprising the group V source-material gas toward the substrate from a second outlet different from the first outlet, a direction of the second gas flow being parallel to a direction of the first gas flow; and growing a second semiconductor crystal layer comprising a nitride semiconductor having a compositional proportion of Al in group III elements of less than 10 atomic percent by mixing the group III source-material gas and the group V source-material gas and supplying a third gas flow comprising the mixed group III and group V source-material gases toward the substrate from at least one of the first outlet and the second outlet.