Patent ID: 6995086
Filing Date: 2006-02-07
Classification: H01L

Abstract:
1. A method for fabricating a through hole comprising: forming a conductive structure on a substrate, wherein the conductive structure comprises at least a conductive layer and a cap layer positioned on the conductive layer; forming a patterned first photoresist layer on the substrate and the conductive structure to define at least a pattern of a through hole; performing a first etching process to remove the cap layer not covered by the first photoresist layer until at least a first portion of the conductive layer is exposed; removing the first photoresist layer; forming a dielectric layer and a patterned second photoresist layer on the substrate in sequence, wherein a pattern of the second photoresist layer is the same as a pattern of the first photoresist layer; and performing a second etching process to remove the dielectric layer not covered by the second photoresist layer until the first portion of the conductive layer is exposed.