Patent ID: 6809008
Filing Date: 2004-10-26
Classification: H01L

Abstract:
A method for making an integrated CMOS-based imaging component, said method comprising the steps of:providing at least one of a donor SOI wafer and a donor p-type wafer; providing a host CMOS wafer; optionally at least one of growing and at least partially converting said SOI wafer to p-type; growing at least one of an intrinsic or p-epitaxial layer on said donor wafer; growing a thermal oxide layer over said at least one of an intrinsic or p-epitaxial layer of said donor wafer; optionally forming alignment keys in a Si layer of said donor wafer; said alignment keys corresponding to base keys on said host wafer; defining an optically active, monocrystalline photosensor region in said donor wafer; fabricating at least one photodiode in said donor wafer using a plurality of ion implant steps; optionally forming an optically reflective structure over the top surface of said donor wafer; at least one of planarizing and preparing said donor wafer for bonding; at least one of planarizing and preparing said host wafer for bonding; aligning said host wafer with said donor wafer; bonding said host wafer with said donor wafer through an interface substantially proximate to metal interconnects of said host CMOS wafer; removing substrate material from said donor surface of the resulting donor/host composite structure; etching at least one via within at least one region of the donor/host composite structure's top surface down to landing pads of said CMOS wafer; at least one of clearing, metallizing and plugging said vias with a metal; optionally re-planarizing the top surface of said donor/host composite structure; optionally forming at least one of a top side anti-reflective coating and a top side passivation layer; and opening access vias to I/O pads embedded in said CMOS wafer.