Methods for bonding wafers using a metal interlayer
First Claim
Patent Images
1. A method comprising:
- depositing a layer of a metal on a number of conductors disposed on a surface of a wafer; and
bonding the conductors of the wafer to corresponding conductors on a surface of a second wafer using the metal layer.
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Abstract
Embodiments of a method of bonding wafers together using a metal interlayer deposited on conductors of each wafer. Also disclosed is a wafer stack formed according to the method of wafer bonding using a metal interlayer.
330 Citations
42 Claims
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1. A method comprising:
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depositing a layer of a metal on a number of conductors disposed on a surface of a wafer; and
bonding the conductors of the wafer to corresponding conductors on a surface of a second wafer using the metal layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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depositing a layer of a first metal on a number of conductors disposed on a first wafer;
depositing a layer of a second metal on a number of conductors disposed on a second wafer;
aligning the first wafer with the second wafer; and
bonding the metal layer on the conductors of the first wafer with the metal layer on the conductors of the second wafer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A wafer stack comprising:
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a first wafer including a number of conductors disposed on a surface of the first wafer, each of the conductors having a layer of metal formed thereon; and
a second wafer including a number of conductors disposed on a surface of the second wafer, each of the conductors having a layer of metal formed thereon;
wherein the metal layer of each conductor of the first wafer is bonded to the metal layer on a corresponding conductor of the second wafer. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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37. A wafer stack comprising:
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a first wafer, the first wafer having an interconnect including an uppermost dielectric layer and a number of lower dielectric layers, each lower dielectric layer including a number of conductors comprised of a first metal and the uppermost dielectric layer including a number of conductors comprised of a third metal; and
a second wafer, the second wafer having an interconnect including an uppermost dielectric layer and a number of lower dielectric layers, each lower dielectric layer including a number of conductors comprised of a second metal and the uppermost dielectric layer including a number of conductors comprised of a fourth metal;
wherein the conductors comprised of the third metal and the conductors comprised of the fourth metal are capable of bonding together at a temperature of approximately 300°
Celsius or less; and
wherein the conductors of the uppermost dielectric layer of the first wafer are bonded to the conductors of the uppermost dielectric layer of the second wafer. - View Dependent Claims (38, 39, 40, 41, 42)
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Specification