Patent ID: 6589864
Filing Date: 2003-07-08
Classification: H01L

Abstract:
A method for defining plural windows with different etching depths simultaneously, comprising steps of:depositing a multiple film structure on a substrate, wherein said multiple film structure comprising a plurality of layers including a first metal conducting layer, a second metal conducting layer located above said first metal conducting layer, a first insulating layer located between said first and second metal conducting layers, and a second insulating layer located above the second metal conducting layer; forming a photoresist above said multiple film structure; providing a photo mask having a first penetrable region and a second penetrable region respectively corresponding to a first region and a second region of said photoresist, wherein said first penetrable region has a higher-penetrability rate relative to that of said second penetrable region; exposing said first region of said photoresist to a first exposure dose and said second region of said photoresist to a second exposure dose; obtaining different remaining thicknesses of said photoresist on said first region and said second region by a development; and non-selectively etching said first region and said second region of said photoresist to form first and second windows respectively in said multiple film structure, said first window extending to and exposing said first metal conducting layer, and said second window extending to and exposing said second metal conducting layer.