Patent ID: 6228721
Filing Date: 2001-05-08
Classification: H01L,Y10S

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