Patent ID: 6610575
Filing Date: 2003-08-26
Classification: H01L

Abstract:
A method of making a structure having dual gate oxide thicknesses, comprising the steps of:providing a substrate having first and second pillars; the first and second pillars each having an outer side wall and an inner side wall; masking at least one of the outer or inner side walls of at least one of the first and second pillars leaving at least one of the outer or inner side walls of at least one of the first and second pillars exposed; implanting dopants through the at least one of the exposed outer or inner side walls modifying the surface of the at least one of the doped exposed outer or inner side walls; unmasking the at least one of the masked outer or inner side walls of at least one of the first and second pillars; and growing gate oxide on the outer side walls and the inner side walls of the first and second pillars wherein the gate oxide grown upon the modified surfaces of the at least one of the doped outer or inner side walls is thicker than the gate oxide grown upon the non-modified surfaces of the at least one of the non-doped outer or inner side walls.