Patent ID: 6620699
Filing Date: 2003-09-16
Classification: H01L

Abstract:
A method for forming an inside nitride spacer in a deep trench device DRAM cell comprising the steps of:depositing an oxide liner in a trench etched from a substrate and a pad nitride layer deposited over the substrate, wherein a pad oxide layer lines the trench and underlies the pad nitride layer, and wherein the oxide liner covers a recessed gate poly in the trench; depositing a spacer material on the oxide liner wherein a portion of the oxide liner covering the recessed gate poly is exposed in the trench; removing the exposed portion of the oxide liner from the recessed gate poly in the trench; filling the trench with a poly stud material, wherein the spacer material is encapsulated in the poly stud material; and stripping the pad nitride layer, wherein the spacer encapsulated in the poly stud material is conserved.