Patent ID: 6352923
Filing Date: 2002-03-05
Classification: H01L

Abstract:
A method of fabricating a direct contact through hole type wafer, comprising the steps of:providing a silicon-on-insulator substrate, having a first surface and a second surface, made from a first insulation layer, a first silicon substrate and a second silicon substrate, wherein the first insulation layer is located between the first silicon substrate and the second silicon substrate; forming devices and a plurality of contact plugs in the first silicon substrate; forming a plurality of stacked dielectric layers over the first surface of the silicon-on-insulator substrate, and a plurality of patterned conductive layers in the stacked dielectric layers; forming a plurality of plugs in the dielectric layers, wherein a portion of the patterned conductive layers are connected to the contact plugs and the devices by a portion of the plugs, wherein at least one bonding pad is formed on an uppermost patterned conductive layer and exposed by an uppermost dielectric layer formed on the uppermost patterned conductive layer; removing a portion of the second silicon substrate from the second surface of the silicon-on-insulator substrate to form an opening to expose the contact plugs, wherein the opening is aligned with the contact plugs; removing a portion of the first insulation layer and a portion of the first silicon substrate in the opening to expose the contact plugs; forming a second insulation layer in the opening and along a surface of the first and the second silicon substrate, wherein the contact plugs are exposed; and forming a barrier layer and a metal layer in sequence on the second insulation layer.