Patent ID: 8835303
Filing Date: 2014-09-16
Classification: H01L

Abstract:
1. A method, comprising: forming an etch mask above a dielectric material of a first metallization layer of a semiconductor device, said etch mask comprising a mask opening having a first lateral size corresponding to a target lateral size at a bottom of a via to be formed in said dielectric material; forming a via opening on the basis of said mask opening having said first lateral size, said via opening extending to a first depth in said dielectric material; increasing a lateral size of said mask opening from said first lateral size to a second lateral size; increasing a depth of said via opening in said dielectric material from said first depth to a second depth on the basis of said mask opening having said second lateral size, wherein after increasing said depth, a lateral size of a top of said via opening is greater than a lateral size of a bottom of said via opening; after increasing said depth of said via opening, forming a trench above said via opening in said dielectric material so as to connect to said via opening; and commonly filling said via opening and said trench with a metal-containing material, said via opening extending to a metal region of a second metallization layer located below said first metallization layer.