Patent ID: 6503801
Filing Date: 2003-01-07
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device, the method comprising:ion implanting atoms into a portion of a main surface of a semiconductor substrate or a well region containing a first conductive type impurity, to form a damage region adjacent to a first side portion of a channel region in the main surface; annealing to diffuse the first conductive type impurity atoms in the channel region and damage region toward an interface region between the channel region and damage region, thereby forming a high impurity region of the first conductive type in the interface region; and ion implanting a second conductive type impurity into the main surface to form a source region overlapping the damage region and adjacent to the first side portion of the channel region; wherein the channel region, damage region and source region form a non-uniform channel impurity profile that reduces a threshold voltage roll-off associated with the channel region.