Patent ID: 6593210
Filing Date: 2003-07-15
Classification: H01L

Abstract:
A method of forming trench isolation regions within a semiconductor substrate, comprising:forming trenches in the semiconductor substrate; depositing a semi-conformal dielectric material over the substrate, wherein the semi-conformal dielectric material has valleys positioned over the trenches; forming an inorganic conformal film over the semi-conformal dielectric material with the proviso that a photoresist is not deposited over the inorganic conformal film and the semi-conformal dielectric material; polishing the semiconductor substrate whereby a first portion of the inorganic conformal film is removed thereby exposing a portion of the semi-conformal dielectric material, and a second portion remains over the valleys of the semi-conformal dielectric material; removing the exposed portions of the semi-conformal dielectric material; and planarizing the substrate to provide the semiconductor substrate having trenches with a dielectric material therein.