Method of forming micro electromechanical system sensor
First Claim
1. A method of making a micro electromechanical system (MEMS) package, the method comprising:
- patterning a substrate to form a MEMS section;
bonding a carrier to a surface of the substrate, wherein the carrier is free of active devices, wherein the carrier includes a carrier bond pad on a surface of the carrier opposite the MEMS section, and the carrier bond pad is electrically connected to the MEMS section; and
bonding a wafer bond pad of an active circuit wafer to the carrier bond pad, wherein the bonding of the wafer bond pad to the carrier bond pad comprises re-graining the wafer bond pad to form at least one grain boundary extending from the wafer bond pad to the carrier bond pad.
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Accused Products
Abstract
A method of making a micro electromechanical system (MEMS) package includes patterning a substrate to form a MEMS section. The method further includes bonding a carrier to a surface of the substrate. The carrier is free of active devices. The carrier includes a carrier bond pad on a surface of the carrier opposite the MEMS section. The carrier bond pad is electrically connected to the MEMS section. The method further includes bonding a wafer bond pad of an active circuit wafer to the carrier bond pad. The bonding of the wafer bond pad to the carrier bond pad includes re-graining the wafer bond pad to form at least one grain boundary extending from the wafer bond pad to the carrier bond pad.
54 Citations
20 Claims
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1. A method of making a micro electromechanical system (MEMS) package, the method comprising:
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patterning a substrate to form a MEMS section; bonding a carrier to a surface of the substrate, wherein the carrier is free of active devices, wherein the carrier includes a carrier bond pad on a surface of the carrier opposite the MEMS section, and the carrier bond pad is electrically connected to the MEMS section; and bonding a wafer bond pad of an active circuit wafer to the carrier bond pad, wherein the bonding of the wafer bond pad to the carrier bond pad comprises re-graining the wafer bond pad to form at least one grain boundary extending from the wafer bond pad to the carrier bond pad. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of making a micro electromechanical system (MEMS) package, the method comprising:
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patterning a substrate to form a MEMS section; bonding a carrier to a surface of the substrate, wherein the carrier is free of active devices; forming a carrier bond pad electrically connected to the MEMS section through the carrier; and fusion bonding a wafer bond pad to the carrier bond pad, wherein the fusion bonding of the wafer bond pad to the carrier bond pad comprises forming a grain boundary extending across an interface of the wafer bond pad and the carrier bond pad. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of making a micro electromechanical system (MEMS) package, the method comprising:
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bonding a carrier to a surface of a MEMS section, wherein the carrier is free of active devices; forming an isolation feature extended from an uppermost surface of the carrier to a lowermost surface of the carrier; embedding a carrier bond pad in the carrier, wherein the carrier bond pad is in an area of the carrier surrounded by the isolation feature, and the carrier bond pad is electrically connected to the MEMS section through a semiconductor material of the carrier; and fusion bonding a wafer bond pad to the carrier bond pad, wherein the fusion bonding of the wafer bond pad to the carrier bond pad comprises forming a grain boundary extending across an interface of the wafer bond pad and the carrier bond pad. - View Dependent Claims (17, 18, 19, 20)
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Specification