Patent ID: 7138305

Claim:
A method of forming a semiconductor device, comprising: forming a silicon film on a substrate; forming a sacrificial block on the silicon film, the sacrificial block having laterally opposite sidewalls; depositing an insulating layer over the sacrificial block and the silicon film; forming an insulating spacer on each of the laterally opposite sidewalls of the sacrificial block by performing an anisotropic etch on the insulating layer; removing the sacrificial block; forming two silicon fins by etching through the silicon film to the substrate using the insulating spacers as a mask, wherein each silicon fin has a top surface and a pair of laterally opposite sidewalls; removing the insulating spacers to expose the top surface of each silicon fin; and forming a gate dielectric layer on the top surface and on the sidewalls of each silicon fin by atomic layer deposition (ALD), wherein each silicon fin has at least one corner with a radius of curvature of less than 10 nm being defined by the atomic layer deposition of the gate dielectric layer at the corner of the silicon fin.