Patent ID: 6184128
Filing Date: 2001-02-06
Classification: H01L

Abstract:
A dual damascene method comprising:providing a substrate having a first low k material layer;forming a first hard mask layer over the first low k material layer;patterning a first opening having a first width in the first hard mask layer using a first photoresist thereby exposing a portion of the first low k material layer;removing the first photoresist;depositing a second low k material layer over the patterned first hard mask layer and the exposed portion of the first low k material layer;forming a second hard mask layer over the second low k material layer;patterning a second opening having a width larger than the first width in the second hard mask layer using a second photoresist thereby exposing a portion of the second low k material layer;anisotropically etching the exposed portions of the first and second low k material layers; andremoving the second photoresist, wherein and at least one of the first photoresist and the second photoresist have a thickness of about 1,500 .ANG. or less.