Patent ID: 6348733
Filing Date: 2002-02-19
Classification: H01L

Abstract:
A dual damascene structure, comprising:a first layer of silicon oxide on a first layer of silicon nitride; a second layer of silicon nitride on said first layer of silicon oxide; a second layer of silicon oxide, having an upper surface, on said second silicon nitride layer; a trench, having a width and interior walls, extending downward from the upper surface, through the second silicon nitride and silicon oxide layers into the first silicon oxide layer; a tubular structure of silicon nitride, having a maximum outside dimension that is less than said trench width and having interior walls, overlapped by the trench and extending downwards therefrom through the first layers of silicon oxide and silicon nitride, as far as a lower-level layer of damascene wiring; a barrier layer on the interior walls of the trench, the tubular structure, and the lower-level damascene wiring layer; and copper, over said barrier layer, that fills said tubular structure and said trench to the level of said upper surface.