Patent ID: 6303043
Filing Date: 2001-10-16
Classification: G02F,H01L,Y10S

Abstract:
A method of fabricating a preserve layer comprising:forming a top metallic layer over the substrate;removing portions of the metallic layer and the substrate to form a trench;forming a conformal pad oxide layer over the metallic layer, not completely filling the trench;forming a conformal first nitride layer on the pad oxide layer;forming a spin-on glass layer on the first nitride layer to fill the trench;forming an etched-back surface by performing an etching back step to remove a portion of the spin-on glass layer, wherein a remaining portion of the spin-on glass layer fills the trench to a surface of the first nitride layer above the top metallic layer;forming an oxide layer over the etched-back surface; andforming a second nitride layer on the oxide layer.