Patent ID: 6313026
Filing Date: 2001-11-06
Classification: H01L

Abstract:
A method for constructing a contact between a first conductive layer and a second conductive layer in a microelectronic device, comprising:forming a first material on a substrate;forming a first conductive layer with a top surface on the first material;forming a pattern in the first conductive layer, the pattern defining edges in the first conductive layer;forming a dielectric layer on the surface of the first conductive layer;removing a portion of the dielectric layer over the pattern to expose at least:a portion of the top surface of the first conductive layer, anda portion of the edges in the first conductive layer;removing a portion of the first material beneath the exposed portion of the pattern;forming an undercut in the first material which is underneath the exposed surface of the first conductive layer;forming a conductive material on the structure wherein the conductive material:fills a portion of the undercut,contacts the exposed edges in the first conductive layer, andcontacts the exposed top surface of the first conductive layer; andforming a second conductive layer in contact with the conductive material, whereby the first conductive layer and the second conductive layer are brought into contact through the conductive material.