Patent ID: 8377820
Filing Date: 2013-02-19
Classification: H01L

Abstract:
1. A method, comprising: forming a first etch mask above a dielectric material of a metallization layer of a semiconductor device, said first etch mask comprising a mask opening having a first lateral size; forming an etch stop layer above said first etch mask; forming a second etch mask above said etch stop layer, said second etch mask comprising a second mask opening aligned to said first mask opening and having a second lateral size that is greater than said first lateral size; forming a portion of a via opening on the basis of said first and second mask openings so as to extend to a first depth in said dielectric material; forming said second mask opening in said first etch mask by using said second etch mask as an etch template; increasing a depth of said via opening; and forming a trench in said dielectric material using said second mask opening as an etch mask.