Patent ID: 6177338
Filing Date: 2001-01-23
Classification: H01L

Abstract:
A method of fabricating a MOSFET device, on a semiconductor substrate, using a metal filled, contact hole, to provide electrical contact between an overlying metal interconnect structure, and an underlying conductive region in said semiconductor substrate, comprising the steps of:providing a gate structure, on an underlying gate insulator layer, with a source/drain region located in a region of said semiconductor substrate, not covered by the gate structure;depositing an interlevel dielectric, (ILD), layer;opening a narrow contact hole, with a diameter between about 2000 to 3000 Angstroms,in said ILD layer, exposing an area of said source/drain region, located at the bottom of said contact hole;depositing an adhesive metal layer on the top surface of said ILD layer, on the walls of said narrow contact hole, and on the area of said source/drain region, exposed at the bottom of said narrow contact hole;depositing a first barrier layer, on said adhesive metal layer;performing an anneal procedure to form a metal silicide layer on said source/drain region, at the bottom of said narrow contact hole, with said metal silicide layer formed from a bottom portion of said adhesive metal layer, and from a top portion of said source/drain region, and with said anneal procedure creating cracks in said first barrier layer;depositing a thin second barrier layer, between about 200 to 500 Angstroms, on said first barrier layers, and with said thin second barrier layer filling said cracks in said first barrier layer;depositing a first; metal layer;removing said first metal layer, said thin second barrier layer, said first barrier layer, and said adhesive metal layer, from the top surface of said ILD layer, resulting in a metal plug structure, in said contact hole, with said metal plug structure located between composite layers, located on the walls of said contact hole, with said composite layers comprised of said thin second barrier layer, of said first barrier layer, and of said adhesive metal layer, while said metal plug structure, also overlays a group of layers, at the bottom of said contact hole, comprised of said thin second barrier layer, of said first barrier layer, of a top portion of said adhesive metal layer, and of said metal silicide layer; andforming a metal interconnect structure, overlying and contacting, the top surface of said metal plug structure, and overlying a portion of the top surface of said ILD layer.