Patent ID: 6191028
Filing Date: 2001-02-20
Classification: H01L

Abstract:
A method of patterning a dielectric layer, wherein a substrate having a metal wiring layer formed thereon is provided, comprising:forming a first dielectric layer on the metal wiring layer;forming a first masking layer on the first dielectric layer, and a first cap insulation layer on the first masking layer;forming a first opening aligned with the metal wiring layer by etching the first cap insulation layer, so that the underlying first masking layer is exposed;etching the exposed first masking layer to expose the first dielectric layer;forming a second dielectric layer, a second masking layer and a second cap insulation over the substrate in sequence;forming a second opening by etching the second cap insulation, so that the second masking layer is open within the second opening;etching the exposed second masking layer and the underlying second dielectric layer, and etching the first dielectric layer by using the second cap insulation layer as a mask until the metal wiring layer is exposed; andforming a conductive layer over the substrate.