Patent ID: 6015735
Filing Date: 2000-01-18
Classification: H01L

Abstract:
A method for forming a DRAM capacitor comprising the steps of:providing a substrate,depositing a layer of a doped dielectric material on said substrate,depositing a layer of an undoped dielectric material on said doped dielectric layer,depositing a layer of a photoresist material on said undoped dielectric layer, said photoresist layer generates an acidic reaction product when exposed to UV radiation,patterning said photoresist layer for a capacitor cell opening, andetching said cell opening through said undoped and doped dielectric layers exposing said substrate by a technique that generates UV emission such that an acidic reaction product is released from said photoresist layer to selectively etching said doped dielectric layer in a lateral direction to a larger toroidal cavity than the toroidal cavity formed in said undoped dielectric layer.