Patent ID: 7892944

Claim:
A method of forming a transistor in a semiconductor device, comprising: forming an oxide-based layer and a nitride-based layer over a substrate; forming a device isolation structure over the substrate to define an active region, wherein the oxide-based layer and the nitride-based layer are formed between the active region and the device isolation structure; after the forming of the oxide-based layer and the nitride-based layer, etching a predetermined gate region in the active region to form a recess region and to expose portions of the oxide-based layer at sidewalls of the recess region; performing a tilted ion implantation process, using at least a neutral element, on the exposed portions of the oxide-based layer and extended portions of the oxide-based layer that extends from the exposed portions and below the recess region to form damage layers; and removing the damage layers causing a portion of the active region exposed at the bottom of the recess region to form a fin type structure.