Patent ID: 6117767
Filing Date: 2000-09-12
Classification: H01L

Abstract:
A fabrication method comprising:forming two raised structures on said substrate having a space therebetween, each said raised structure having a top surface and a side wall projecting from the substrate to terminate at the top surface, each said side wall having a spacer thereon projecting from the substrate and extending to the top surface of the respective raised structure;forming a layer of silicon-rich silicon nitride conformably over said raised structures, said spacers, and said substrate therebetween;forming a layer of etchable material over said layer of silicon-rich silicon nitride to fill said space;forming a mask layer over said layer of etchable material;patterning said mask layer to expose an area of said layer of etchable material over said space;etching said etchable layer with an etchant selective to silicon nitride;removing the layer of silicon-rich silicon nitride to expose a horizontal surface on said substrate between the two raised structures.