Patent ID: 6653223
Filing Date: 2003-11-25
Classification: H01L

Abstract:
A method for forming a dual damascene aperture comprising:providing a substrate; forming over the substrate a patterned first dielectric layer which defines at least part of a via; forming over the patterned first dielectric layer a blanket second dielectric layer deposited such as to incompletely fill the via and form a void within an incompletely filled via; forming over the blanket second dielectric layer an etch mask layer which defines the location of a trench to be formed through the blanket second dielectric layer and overlapping the via; and etching the blanket second dielectric layer, while employing the etch mask layer, to form the trench overlapping a re-opened via formed from the incompletely filled via, wherein by forming the void within the incompletely filled via there is provided enhanced dimensional control when forming the re-opened via from the incompletely filled via.