Patent ID: 6432810
Filing Date: 2002-08-13
Classification: H01L

Abstract:
A method for manufacturing a dual damascene structure, said method comprising the steps of:forming a first conductive layer over a substrate; forming an isolation pillar on said first conductive layer; forming a second conductive layer along a surface of said isolation pillar and said first conductive layer; forming a second isolation layer over said second conductive layer; removing a portion of said second isolation layer, thereby exposing said isolation pillar; forming a third isolation layer on said second isolation layer; patterning said third isolation layer to form a trench in said third isolation layer; removing said isolation pillar, thereby forming an opening in said second isolation layer; refilling a conductive material in said trench and said opening, thereby connecting to said first conductive layer; wherein said second conductive layer is thinner compared to said first conductive layer, the re by controlling a size of said conductive plug by controlling the thickness of said second conductive layer.