Patent ID: 6440861
Filing Date: 2002-08-27
Classification: H01L

Abstract:
A method of forming a dual damascene structure, comprising the steps of:providing a substrate; forming a first low dielectric constant dielectric layer over the substrate; forming a second low dielectric constant dielectric layer over the first low dielectric constant dielectric layer; forming a first patterned photoresist layer above the substrate; removing a portion of the first dielectric layer and the second dielectric layer to form a via opening using the first patterned photoresist layer as a mask; removing the first patterned photoresist layer; forming a conformal third dielectric layer over the surface of the second dielectric layer and the interior surface of the via opening; forming a second patterned photoresist layer over the third dielectric layer; removing a portion of the second dielectric layer to form a trench using the second patterned photoresist layer as a mask; removing the second patterned photoresist layer; removing the third dielectric layer; and depositing conductive material into the via opening and the trench to form a conductive layer.