Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making electrical device
Patent
1997-04-09
1998-04-28
Duda, Kathleen
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making electrical device
430315, 430330, G03F 726
Patent
active
057442843
ABSTRACT:
A method for fabricating resilient z-axis contacts to electrically interconnect IC wafers or MCMs in 3-D integrated circuits uses photolithography to provide larger carrier sizes, higher contact densities by decreasing the spacing, smaller contact footpads, and precise control of the contact's shape and position. The contacts are fabricated by forming photoresist patterns on the carrier's top and bottom surfaces that are initially rectangular, and then reflowing the photoresist materials to provide smooth surfaces suitable for forming the metal contacts, and depositing metal layers over the respective patterns. Second photoresist patterns are formed over respective metal layers to conform with the contact's shape, the metal is etched away according to the pattern, and the photoresists are removed such that the remaining metalization forms a resilient z-axis contact that is attached to the carrier and extends therefrom with a predetermined shape.
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M. P. Lepselter, "Air-Insulated Beam-Lead Crossovers for Integrated Circuits", The Bell System Technical Journal, vol. 47, No. 2, Feb. 1968, pp. 269-271.
Foschaar James A.
Garvin Hugh L.
Laub Soyeon P.
Little Michael J.
Yung Michael W.
Denson-Low W. K.
Duda Kathleen
Duraiswamy V. D.
Hughes Aircraft Company
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