Patent ID: 6297087
Filing Date: 2001-10-02
Classification: H01L

Abstract:
A process for DRAM cell production, comprising:depositing a layer of a first substance in a trench,depositing a first layer of a second substance in said trench,growing an interfacial layer of oxide between said layer of said first substance and said first layer of said second substance,growing an interfacial layer of oxide between side walls of said trench and said first layer of said second substance,applying an anisotropic etching substance to the surface of said first layer of said second substance, thereby protecting said interfacial layer of oxide between said side walls of said trench and said first layer of said second substance and exposing said interfacial layer of oxide disposed on top of said layer of said first substance,applying a second etching substance, thereby substantially removing said interfacial layer of oxide disposed on top of said layer of said first substance, anddepositing a second layer of said second substance that substantially fills said trench.