Patent ID: 6156618
Filing Date: 2000-12-05
Classification: H01L

Abstract:
A method for forming thin film resistor, the method comprising:providing an inter-layer dielectric having contact regions wherein a barrier metal layer is formed on top surface of said dielectric;forming a tungsten layer on said inter-layer dielectric and etching back until stopping on said barrier metal;forming an inter-layer dielectric on said top surface of the thin-film resistor;forming a band layer on said inter-layer dielectric;depositing a silicon nitride layer onto said band layer;removing parts of said nitride layer and said inter-layer dielectric;patterning said band layer to define as contact plug;forming an inter-layer dielectric over the top surface of the thin-film resistor;anisotropically etching back said inter-layer dielectric to form contact plug;simultaneously anisotropically etching back said silicon nitride layer;removing inter-layer dielectric which is over said top surface of the thin-film resistor;forming a metal layer over top surface of the thin-film resistor, wherein said metal layer fills said contact plug;forming a photoresist layer on said metal layer, wherein said photoresist layer defines metal area;removing portions of said metal layer left uncovered by said photoresist layer; and removing said photoresist layer.