Patent ID: 9583435
Date: 2017-02-28
CPC Classifications: H01L

Claim:
1. A method for forming fence conductors in a semiconductor integrated circuit die, said method comprising the steps of: depositing a first dielectric on a face of a semiconductor substrate; creating at least one trench in the first dielectric; depositing a sacrificial film on the first dielectric including walls and a bottom of the at least one trench; removing portions of the sacrificial film from a face of the first dielectric and the bottom of the at least one trench, wherein only sacrificial films remain on the walls of the at least one trench; depositing a second dielectric between the sacrificial films on the walls of the at least one trench; removing the first and second dielectrics until top portions of the sacrificial film are exposed between the first and second dielectrics; removing the sacrificial films between the first and second dielectrics leaving at least two narrow channels therein; depositing conductive material on faces of the first and second dielectrics and into the at least two narrow channels; removing portions of the conductive material on the faces of the first and second dielectrics until only tops of the conductive material are exposed in the at least two narrow channels: and depositing a barrier layer in one of the at least two narrow channels before the step of depositing the conductive material therein.