Method of making a 3-dimensional circuit assembly having electrical contacts that extend through the IC layer
First Claim
1. A method of fabricating a three-dimensional (3-D) circuit assembly, comprising:
- providing a first substrate with a first set of at least one electrical contact pad thereon,adhering a first IC layer to said first substrate and electrically insulating said first IC layer and said first substrate from each other with an adherent material, said first IC layer provided with a layer of insulative material on its opposite side from said adherent material,establishing a first set of at least one electrical contact to said first IC layer,forming a first set of at least one opening through said layer of insulative material, said first IC layer and said adherent material to said first set of at least one electrical contact pad on said first substrateforming a second set of at least one opening through said layer of insulative material and through said first IC layer, said first set of at least one electrical contact extending through said second set of at least one opening,establishing a second set of at least one electrical contact through said first set of openings to said first set of at least one electrical contact pad on said first substrate.
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Accused Products
Abstract
A 3-dimensional circuit assembly includes a lower substrate, a first integrated circuit (IC) layer that is adhered to and electrically insulated from the substrate, electrical contacts for the IC layer, and separate electrical contacts for the substrate that extend through and are insulated from the IC layer. The IC layer is surmounted by an insulating layer through which the electrical contacts also extend, and across which interconnections between different contacts may be made. The IC layer and substrate are held together by an adhesion layer, with the adhesion, IC and insulating layers all being thin enough to assume the coefficient of thermal expansion for the underlying substrate, which is much thicker. The substrate may itself have a second IC layer to which contacts are made, or it may be implemented as the photodetector of a focal plane array. Two standard wafers are used to form the package, with the substrate for the upper wafer removed either before or after bonding to the lower wafer. Additional IC layers may be added by adding additional wafers in a similar fashion.
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Citations
11 Claims
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1. A method of fabricating a three-dimensional (3-D) circuit assembly, comprising:
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providing a first substrate with a first set of at least one electrical contact pad thereon, adhering a first IC layer to said first substrate and electrically insulating said first IC layer and said first substrate from each other with an adherent material, said first IC layer provided with a layer of insulative material on its opposite side from said adherent material, establishing a first set of at least one electrical contact to said first IC layer, forming a first set of at least one opening through said layer of insulative material, said first IC layer and said adherent material to said first set of at least one electrical contact pad on said first substrate forming a second set of at least one opening through said layer of insulative material and through said first IC layer, said first set of at least one electrical contact extending through said second set of at least one opening, establishing a second set of at least one electrical contact through said first set of openings to said first set of at least one electrical contact pad on said first substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification