Patent ID: 6020267
Filing Date: 2000-02-01
Classification: H01L

Abstract:
A method for fabricating a local interconnect metal structure, on a semiconductor substrate, using an anti-reflective coating, as part of the local interconnect metal structure, comprising the steps of:providing transfer gate transistors, comprised of polysilicon gate structures, on a thin gate insulator layer, and comprised of source and drain regions, in said semiconductor substrate, between said polysilicon gate structures;forming a via hole opening, in a composite insulator layer, exposing a source and drain region;depositing a composite metal layer on the sides of said via hole opening, and on the top surface of said composite insulator layer;forming a metal plug in said via hole opening, with said metal plug residing on the portion of said composite metal layer that is located on the sides of said via hole opening;depositing said anti-reflective coating on the top surface of said metal plug, and on the portion of said composite metal layer, not covered by said metal plug;depositing a metal interconnect layer on the top surface of said anti-reflective coating; andpatterning of said metal interconnect layer, of said anti-reflective coating, and of said composite metal layer, to form said local interconnect metal structure, contacting underlying, said metal plug, in said via hole opening.