Patent ID: 7915162
Filing Date: 2011-03-29
Classification: H01L

Abstract:
1. A method of forming a semiconductor device, comprising: providing a substrate; depositing a first dielectric layer on and in direct mechanical contact with a top surface of the substrate, wherein the first dielectric layer comprises a first dielectric material; depositing a first hard mask on the first dielectric layer, wherein the first hard mask comprises a first lower hard mask layer and a second upper hard mask layer; forming a first trench and a second trench, wherein the first trench and the second trench are each formed within the first dielectric layer and the first hard mask, wherein the second trench is wider than the first trench in a first direction that is parallel to the top surface of the substrate, wherein the first trench and the second trench are physically isolated from each other by being physically separated from each other by a portion of the first dielectric layer, wherein a bottom of the first trench is in direct physical contact with a first portion of the top surface of the substrate, and wherein a bottom of the second trench is in direct physical contact with a second portion of the top surface of the substrate; depositing a first conformal liner over a top surface of the first hard mask and within both the first trench and the second trench, wherein the first conformal liner comprises a second dielectric material; removing a portion of the first conformal liner, wherein the first conformal liner that remains after said removing said portion of the first conformal liner is performed is not on the top surface of the first hard mask and is in direct physical contact with the top surface of the substrate, the first dielectric layer, and the first hard mask; depositing a first conductive material over the first conformal liner to fill the first and second trenches and extend above the first and second trenches and above the first hard mask, wherein the first conductive material comprises copper; and planarizing the first conductive material to remove an excess of the first conductive material that extend above the first and second trenches and above the first hard mask, resulting in formation of a planar surface of the first conductive material, wherein the planar surface of the first conductive material is parallel to the first direction.