Patent ID: 9728444
Date: 2017-08-08
CPC Classifications: H01L

Claim:
1. A method, comprising: forming a sacrificial layer on a substrate; forming a photoresist mask over the sacrificial layer, wherein the photoresist mask comprises an opening; isotropically etching a portion of the sacrificial layer exposed through the opening of the photoresist mask to form an undercut region in the sacrificial layer below the photoresist mask, wherein the undercut region defines an overhang structure; anisotropically etching a portion of the sacrificial layer exposed through the opening of the photoresist mask to form an opening through the sacrificial layer down to the substrate; depositing metallic material to cover the photoresist mask and to at least partially fill the opening formed in the sacrificial layer without coating the overhang structure with metallic material; and dissolving the sacrificial layer to lift-off the metallic material covering the photoresist mask.