Patent ID: 9659818
Date: 2017-05-23
CPC Classifications: H01L

Claim:
1. A method for forming conductive lines on a substrate, the method comprising: depositing a layer of mandrel material on a substrate; removing portions of the layer of mandrel material to form a first mandrel having a first length and a second mandrel having a second length, the first length is greater than the second length; forming a first spacer with a first spacer material along sidewalls of the first mandrel and the second mandrel, the first spacer defining a gap between the first mandrel and the second mandrel; depositing a layer of a second spacer material over the first spacer, the substrate, the gap, and the first mandrel and the second mandrel; removing portions of the second spacer material to expose portions of the first mandrel, the second mandrel, and the first spacer, and form a second spacer in the gap; removing the first mandrel and the second mandrel to expose portions of the substrate; removing exposed portions of the substrate to form cavities; removing the first spacer and the second spacer; and filling the cavities with a conductive material.