Patent ID: 9048247
Filing Date: 2015-06-02
Classification: B81B,H01L

Abstract:
1. A method for producing at least one metal structure in a semiconductor substrate having a front side provided with a front side layer structure, comprising: producing at least one opening, which extends at least to the front side layer structure, in a rear side of the semiconductor substrate in an area corresponding to a location of the metal structure; filling the at least one opening at least partially with at least one metal to create a metal structure which extends from the rear side of the semiconductor substrate at least to the front side layer structure; masking the rear side of the semiconductor substrate for a trench process for exposing the metal structure, wherein the trench mask includes a lattice structure in an area adjacent to the metal structure; producing an isolation trench adjacent to the metal structure, wherein the metal structure acts as a lateral etch stop and the lattice structure in the trench mask is laterally undercut; and applying at least one sealing layer to the trench mask so that the isolation trench below the lattice structure is closed off as a cavity.