High density three-dimensional IC interconnection
First Claim
1. A method of forming a stacked integrated circuit, comprising the steps of:
- fabricating a first integrated circuit on a first substrate;
fabricating a second integrated circuit on a second substrate; and
bonding the first and second substrates to form interconnects between the first integrated circuit and the second integrated circuit;
wherein said bonding is thermal diffusion bonding of the first substrate to the second substrate to form a stacked IC structure, including bonding of interconnect areas and non-interconnect areas, wherein in the non-interconnect areas, bonding is thermal diffusion bonding of an inorganic material.
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Accused Products
Abstract
General purpose methods for the fabrication of integrated circuits from flexible membranes formed of very thin low stress dielectric materials, such as silicon dioxide or silicon nitride, and semiconductor layers. Semiconductor devices are formed in a semiconductor layer of the membrane. The semiconductor membrane layer is initially formed from a substrate of standard thickness, and all but a thin surface layer of the substrate is then etched or polished away. In another version, the flexible membrane is used as support and electrical interconnect for conventional integrated circuit die bonded thereto, with the interconnect formed in multiple layers in the membrane. Multiple die can be connected to one such membrane, which is then packaged as a multi-chip module. Other applications are based on (circuit) membrane processing for bipolar and MOSFET transistor fabrication, low impedance conductor interconnecting fabrication, flat panel displays, maskless (direct write) lithography, and 3D IC fabrication.
238 Citations
20 Claims
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1. A method of forming a stacked integrated circuit, comprising the steps of:
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fabricating a first integrated circuit on a first substrate; fabricating a second integrated circuit on a second substrate; and bonding the first and second substrates to form interconnects between the first integrated circuit and the second integrated circuit; wherein said bonding is thermal diffusion bonding of the first substrate to the second substrate to form a stacked IC structure, including bonding of interconnect areas and non-interconnect areas, wherein in the non-interconnect areas, bonding is thermal diffusion bonding of an inorganic material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of forming a stacked integrated circuit, comprising the steps of:
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forming on corresponding surfaces of multiple integrated circuit wafers complementary patterns of a material bondable using thermal diffusion bonding; and bonding the wafers together by thermal diffusion bonding of the complementary patterns; wherein bonding includes bonding of interconnect areas and non-interconnect areas, wherein in the non-interconnect areas, bonding is thermal diffusion bonding of an inorganic material. - View Dependent Claims (18)
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19. A method of forming a stacked integrated circuit, comprising the steps of:
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fabricating a first integrated circuit on a first substrate; fabricating a second integrated circuit on a second substrate; and bonding the first and second substrates to form interconnects between the first integrated circuit and the second integrated circuit; wherein said bonding is thermal diffusion bonding of the first substrate to the second substrate to form a stacked IC structure, including bonding of interconnect areas and non-interconnect areas, wherein materials that are thermal diffusion bonded are limited to materials compatible with standard semiconductor processes, including at least one of the following;
metal and a material having silicon as a substantial constituent.
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20. A method of forming a stacked integrated circuit, comprising the steps of:
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forming on corresponding surfaces of multiple integrated circuit wafers complementary patterns of a material bondable using thermal diffusion bonding; and bonding the wafers together by thermal diffusion bonding of the complementary patterns; wherein bonding includes bonding of interconnect areas and non-interconnect areas, wherein materials that are thermal diffusion bonded are limited to materials compatible with standard semiconductor processes, including at least one of the following;
metal and a material having silicon as a substantial constituent.
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Specification