Patent ID: 6653221
Filing Date: 2003-11-25
Classification: H01L

Abstract:
A method for fabricating local interconnects in an insulating material overlaying an SOI device comprising:providing an SOI structure having a substrate layer, an oxide layer over the substrate layer and a silicon layer over the oxide layer; forming at least one isolation trench in the silicon layer; forming an insulating layer over the silicon layer; forming a ground opening extending from a top surface of the insulating layer through the at least one trench isolation to the substrate layer; forming at least one local interconnect opening in the insulating layer extending from the top surface of the insulating layer to the silicon layer, wherein forming the local interconnect opening is performed after forming the ground opening; filling the ground opening and the local interconnect opening with a contact material layer; and polishing back the contact material layer to the insulating layer to form a ground contact from the top surface of the insulating layer to the substrate layer and a local interconnect contact from the top surface of the insulating layer to the silicon layer.