Patent ID: 9484254
Filing Date: 2016-11-01
CPC Classification: H01L

Claim Text:
1. A method of forming a structure, said method comprising: forming a first trench having a width greater than a threshold distance and a second trench having a width not greater than said threshold distance in a dielectric layer located on a substrate; forming a blocking material layer in said first trench and said second trench, wherein said blocking material layer is deposited conformally with a thickness that is greater than one half of said threshold distance; removing said blocking material layer from within said first trench while said second trench is filled with a remaining portion of said blocking material layer; filling said first trench with a first metallic material and planarizing said first metallic material to form a first metallic structure within said first trench; removing said remaining portion of said blocking material layer selective to said dielectric material layer; and filling said second trench with a second metallic material different from said first metallic material.