Patent ID: 6737348
Filing Date: 2004-05-18
Classification: H01L

Abstract:
A method for forming a buried interconnect comprising the steps of:forming holes in a first insulating film deposited on a substrate; depositing a first conducting film over said first insulating film including said holes and subjecting said first conducting film to first CMP, whereby forming plugs from said first conducting film; planarizing said first insulating film by eliminating erosion caused in a region of said first insulating film where said plugs are densely formed through second CMP carried out on said first insulating film with a polishing rate of said first insulating film higher than a polishing rate of said first conducting film; depositing a second insulating film on said first insulating film after planarization and forming interconnect grooves in said second insulating film; and depositing a second conducting film over said second insulating film including said interconnect grooves and subjecting said second conducting film to third CMP, whereby forming buried interconnects from said second conducting film.