Patent ID: 9224606
Filing Date: 2015-12-29
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, comprising: forming a patterned protective layer over a substrate, the protective layer forming at least one opening; forming a dielectric isolation structure in the substrate by performing a plurality of ion implantations for implanting ions in the substrate through the at least one opening, wherein each of the plurality of ion implantations implants oxygen ions and is directed at a different angle, wherein the dielectric isolation structure has an upper surface that is entirely coplanar with the substrate; annealing the substrate after the performing the plurality of ion implantations; and performing at least one additional ion implantation directed at the same angle as one of the plurality of ion implantations, wherein the at least one additional implantation is at a different dose than one of the plurality of ion implantations directed at the same angle.