Patent ID: 9502569
Filing Date: 2016-11-22
CPC Classification: H01L

Claim Text:
1. A method for forming a FinFET device, the method comprising: providing a substrate including a silicon substrate, a buried oxide layer, a first semiconductor material layer, stacked from bottom to top; forming a hard mask layer having a pattern of a fin on the first semiconductor material layer, and removing a portion of the first semiconductor material layer using the hard mask layer as an etch mask; forming side wall spacers on side walls of the first semiconductor material layer and the hard mask layer; performing an angled oxygen ion implantation into a surface of the first semiconductor material layer that is exposed at both sides of the side wall spacers, the implantation being carried out at a first incline angle; performing an annealing process to form oxide diffusion regions in the first semiconductor material layer; removing the oxide diffusion regions to form recessed regions in the first semiconductor material layer; removing another portion of the first semiconductor material layer that is not shielded by the hard mask layer and the side wall spacers to expose the buried oxide layer below; and removing the hard mask layer and the side wall spacers to form a fin structure having recessed regions on the sides of the fin, the recessed regions having openings facing away from the fin.