Patent ID: 6174801
Filing Date: 2001-01-16
Classification: G03F,H01L

Abstract:
A method of forming a direct e-beam step profile comprising the steps of:providing a semiconductor substrate having a substructure of devices, and layers formed thereon;forming a first dielectric layer over said substructure;forming an etch-stop nitride layer over said first dielectric layer;forming a second dielectric layer over said nitride layer;forming a photoresist layer over said second dielectric layer;direct e-beam writing said photoresist layer with a plurality of profiles having at least a single and a double step-profile, said double step-profile further comprising a top portion and a bottom portion wherein said top and bottom portions can have differing dimensions from each other;developing and baking said photoresist layer to form said plurality of profiles into said photoresist layer;etching said bottom portion of said double step-profile into said second dielectric layer and said nitride layer;etching further said bottom portion of said double step-profile into said second dielectric layer;dry etching said photoresist layer to transfer said top portion of said double step-profile and said single step-profile to the bottom of said photoresist layer;transferring said top portion of said double step-profile and said single step-profile into underlying said second dielectric layer and said nitride layer; andresist stripping and cleaning said substrate to complete the transfer of said direct e-beam writing plurality of profiles into said first and second dielectric layers.