Patent ID: 6017821
Filing Date: 2000-01-25
Classification: H01L

Abstract:
A method of forming plugs, comprising:providing a conductive layer having an inter-layer dielectric formed thereon;forming a contact hole in the inter-layer dielectric to expose a portion of the conductive layer;forming a glue layer over the inter-layer dielectric and the exposed portion of the conductive layer;depositing a first metallic layer over the glue layer and filling the contact hole;etching back the first metallic layer to remove most of the first metallic layer, thereby exposing the glue layer over the inter-layer dielectric and leaving a residual portion of the first metallic layer only inside a bottom part of the contact hole;depositing a second metallic layer over the glue layer and the residual portion of the first metallic layer to completely fill the contact hole; andremoving the second metallic layer above the inter-layer dielectric using chemical-mechanical polishing to form a metallic plug that is free of any exposed cavities.