Patent ID: 6908859
Filing Date: 2005-06-21
Classification: H01L

Abstract:
1. A method of forming a field affect transistor proximate the outer surface of a semiconductor substrate, comprising: forming a deep n-well by implanting n-type impurities through the outer surface of the semiconductor substrate; forming a shallow n-well by implanting n-type impurities through the outer surface of the semiconductor substrate such that the shallow n-well is formed in the area of the substrate defined by the deep n-well; forming a gate conductor insulatively disposed adjacent the outer surface of the semiconductor substrate proximate the shallow n-well; forming a lightly doped drain extension within the shallow n-well region and proximate one edge of the gate conductor, the lightly doped drain extension region formed by implanting p-type ions into the outer surface of the semiconductor substrate; and forming a drain region in the shallow n-well region adjacent to the lightly doped drain extension region and spaced apart from one edge of the gate conductor by the lightly doped drain extension, the drain region formed by implanting p-type ions into the outer surface of the semiconductor substrate.