Patent ID: 8822333

Claim:
A method of manufacturing a tungsten plug, comprising the steps of: successively preparing an etch stop layer and an inter-layer dielectric (ILD) layer on a silicon substrate layer; and then depositing an advance pattern film (APF) to cover an upper surface of said inter-layer dielectric (ILD) layer; depositing a dielectric anti-reflectivity coating (DARC) to cover said upper surface of said APF; etching said dielectric anti-reflectivity coating (DARC), said APF, said inter-layer dielectric (ILD) layer and said etch stop layer to an upper surface of said silicon substrate layer and a photo resist applied to said DARC coating is removed during manufacturing a contact hole; and then said dielectric anti-reflectivity coating (DARC) is removed, and the exposed advance pattern film (APF) is partly removed for creating a thinner remaining APF; depositing a barrier layer to cover the upper surface of the remaining advance pattern film (APF) and a bottom and a sidewall of said contact hole; and then fully filling tungsten in the contact hole and cover the upper surface of the barrier layer with tungsten; and applying CMP technology to remove a part of the tungsten to the level of the upper surface of the remaining APF, wherein both the top surface of the remaining tungsten filled in the contact hole and the upper surface of the remaining APF lie in the same plane, and then removing said remaining APF so that the top surface of the remaining tungsten filled in the contact hole protrudes from the upper surface of the inter-layer dielectric (ILD) layer.