Patent ID: 6372659
Filing Date: 2002-04-16
Classification: H01L

Abstract:
A method for fabricating a metal oxide structure on a semiconductor substrate, the method including the steps of:A. forming an active device area surrounded by at least one STI (shallow trench isolation) structure in said semiconductor substrate; B. depositing a layer of metal on said semiconductor substrate, wherein said layer of metal contacts said active device area of said semiconductor substrate; C. depositing a layer of oxygen blocking material on said layer of metal; D. etching an opening through said layer of oxygen blocking material to expose an area of said layer of metal on top of said active device area; E. implanting an interfacial dopant through said layer of metal to said semiconductor substrate adjacent said layer of metal in said area of said opening where said layer of metal is exposed; and F. performing a thermal oxidation process to form a metal oxide structure from reaction of oxygen with said area of said opening where said layer of metal is exposed, wherein a thickness of said metal oxide structure is determined by a thickness of said layer of metal, and wherein said layer of oxygen blocking material prevents contact of oxygen with said layer of metal such that said metal oxide structure is formed localized at said area of said opening where said layer of metal is exposed; and wherein said interfacial dopant implanted into said semiconductor substrate adjacent said layer of metal in said step E promotes adhesion of said metal oxide structure to said semiconductor substrate.