Bonding method using porosified surfaces for making stacked structures
First Claim
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1. A device comprising:
- a first device having a first semiconductor substrate having first and second major surfaces, wherein the first semiconductor substrate comprisesa first bonding region with a first bonding surface, wherein the first bonding surface comprises a porosified region which is part of first substrate material of the first semiconductor substrate and extends from the first major surface of the first semiconductor substrate to a depth shallower than the second major surface of the first semiconductor substrate; and
a second device which comprises a second semiconductor substrate having first and second major surfaces, wherein the second semiconductor substrate comprisesa second bonding region with a second bonding surface, wherein the second bonding surface includes a conductive contact comprising a through silicon via (TSV) contact, whereinthe second bonding surface is aligned to be above and facing the porosified region of the first bonding surface, andthe second bonding surface of the conductive contact is bonded to the first bonding surface with the porosified region.
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Abstract
A bonded device having at least one porosified surface is disclosed. The porosification process introduces nanoporous holes into the microstructure of the bonding surfaces of the devices. The material property of a porosified material is softer as compared to a non-porosified material. For the same bonding conditions, the use of the porosified bonding surfaces enhances the bond strength of the bonded interface as compared to the non-porosified material.
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18 Claims
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1. A device comprising:
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a first device having a first semiconductor substrate having first and second major surfaces, wherein the first semiconductor substrate comprises a first bonding region with a first bonding surface, wherein the first bonding surface comprises a porosified region which is part of first substrate material of the first semiconductor substrate and extends from the first major surface of the first semiconductor substrate to a depth shallower than the second major surface of the first semiconductor substrate; and a second device which comprises a second semiconductor substrate having first and second major surfaces, wherein the second semiconductor substrate comprises a second bonding region with a second bonding surface, wherein the second bonding surface includes a conductive contact comprising a through silicon via (TSV) contact, wherein the second bonding surface is aligned to be above and facing the porosified region of the first bonding surface, and the second bonding surface of the conductive contact is bonded to the first bonding surface with the porosified region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification