Semiconductor structures with cavities, and methods of fabrication
First Claim
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1. A manufacturing method comprising:
- forming one or more vias in a first semiconductor substrate having a first side and a second side opposite to the first side, wherein the vias are formed in the second side, wherein the vias do not go through the first substrate;
forming a dielectric and a conductor in at least one of the vias;
forming a mask over the first side of the first substrate to define a cavity;
removing material from the first side of the first substrate to form said cavity, wherein the material removing operation comprises;
removing semiconductor material of the first substrate to expose the dielectric on the first side of the first substrate;
after exposing the dielectric on the first side of the first substrate, removing the dielectric to expose the conductor;
wherein at a conclusion of the material removing operation, the conductor protrudes on the first side in the cavity, and wherein one or more first contact pads are made in the cavity using the protruding conductor;
bonding a contact pad of a first semiconductor die to one of the first contact pads to cause the contact pad of the first semiconductor die to adhere to the one of the first contact pads;
attaching, and electrically connecting, one or more second semiconductor dies to the second side of the first substrate.
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Abstract
Semiconductor dies are bonded to contact pads formed in a substrate'"'"'s cavity. Vias through the substrate open into the cavity. Conductive lines passing through the vias connect the contact pads in the cavity to contact pads on another side of the substrate. A passage in the substrate opens into the cavity and provides an escape or pressure relief path for material filling the cavity. The passage can also be used to introduce material into the cavity.
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Citations
10 Claims
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1. A manufacturing method comprising:
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forming one or more vias in a first semiconductor substrate having a first side and a second side opposite to the first side, wherein the vias are formed in the second side, wherein the vias do not go through the first substrate;
forming a dielectric and a conductor in at least one of the vias;
forming a mask over the first side of the first substrate to define a cavity;
removing material from the first side of the first substrate to form said cavity, wherein the material removing operation comprises;
removing semiconductor material of the first substrate to expose the dielectric on the first side of the first substrate;
after exposing the dielectric on the first side of the first substrate, removing the dielectric to expose the conductor;
wherein at a conclusion of the material removing operation, the conductor protrudes on the first side in the cavity, and wherein one or more first contact pads are made in the cavity using the protruding conductor;
bonding a contact pad of a first semiconductor die to one of the first contact pads to cause the contact pad of the first semiconductor die to adhere to the one of the first contact pads;
attaching, and electrically connecting, one or more second semiconductor dies to the second side of the first substrate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A manufacturing method comprising:
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forming a cavity in a first surface of a first substrate, the cavity having sidewalls, forming one or more grooves in the first surface in the sidewalls, each groove connecting the cavity to the first substrate'"'"'s surface other than the first surface, and forming one or more first contact pads in the cavity;
placing one or more semiconductor integrated circuits into the cavity and bonding one or more contact pads of the one or more semiconductor integrated circuits to the one or more first contact pads to cause the one or more contact pads of the one or more semiconductor integrated circuits to adhere to the one or more first contact pads;
covering the cavity with a wiring substrate, and electrically connecting a contact pad on the wiring substrate to a contact pad on the first substrate, the first substrate and the wiring substrate completely enclosing the cavity except for the one or more grooves. - View Dependent Claims (8, 9, 10)
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Specification