Patent ID: 6586314
Filing Date: 2003-07-01
Classification: H01L

Abstract:
A method of forming a shallow trench isolation (STI), region in a semiconductor substrate, comprising the steps of:forming an oxidation resistant shape featuring an opening which exposes a first region of said semiconductor substrate; performing an ion implantation procedure in a top portion of said first region of said semiconductor substrate, growing an insulator layer in implanted portion of said first region of said semiconductor substrate resulting in rounded corners on the sides of second regions of said semiconductor substrate, wherein said second regions of said semiconductor layer are located underlying said oxidation resistant shape, adjacent to said insulator layer; removing said insulator layer resulting in a recessed first region of said semiconductor substrate; forming insulator spacers on sides of said oxidation resistant shape, overlying said rounded corners of said second regions of said semiconductor substrate; forming a shallow trench shape in a portion of said recessed first region of said semiconductor substrate not covered by said insulator spacers; forming an insulator layer liner on the sides of said shallow trench shape; forming an insulator plug in said shallow trench opening resulting in said STI region comprised of said insulator plug, said insulator liner layer, and said insulator spacers located on said rounded corners; and removing said oxidation resistant shape.