Encapsulated microelectromechanical structure
First Claim
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1. A method of fabricating a microelectromechanical system (MEMS) device, the method comprising:
- forming a MEMS resonator within a semiconductor layer of a semiconductor-on-insulator (SOI) wafer;
bonding a complementary metal oxide semiconductor (CMOS) cover wafer to the SOI wafer via one or more eutectic solder bonds that (i) implement respective paths of electrical conductivity between the CMOS cover wafer and the SOI wafer, and (ii) hermetically seal the MEMS resonator within a chamber enclosed at least in part by the CMOS cover wafer and the substrate layer of the SOI wafer, wherein bonding the CMOS cover wafer to the SOI wafer via one or more eutectic solder bonds that implement respective paths of electrical conductivity between the CMOS cover wafer and the SOI wafer comprises forming a first eutectic solder bond that implements a path of electrical conductivity between respective contact regions within the SOI wafer and CMOS cover wafer; and
forming, as the contact region within the CMOS cover wafer, a contact region that extends between opposite surfaces of the CMOS cover wafer.
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Abstract
After forming a microelectromechanical-system (MEMS) resonator within a silicon-on-insulator (SOI) wafer, a complementary metal oxide semiconductor (CMOS) cover wafer is bonded to the SOI wafer via one or more eutectic solder bonds that implement respective paths of electrical conductivity between the two wafers and hermetically seal the MEMS resonator within a chamber.
268 Citations
16 Claims
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1. A method of fabricating a microelectromechanical system (MEMS) device, the method comprising:
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forming a MEMS resonator within a semiconductor layer of a semiconductor-on-insulator (SOI) wafer; bonding a complementary metal oxide semiconductor (CMOS) cover wafer to the SOI wafer via one or more eutectic solder bonds that (i) implement respective paths of electrical conductivity between the CMOS cover wafer and the SOI wafer, and (ii) hermetically seal the MEMS resonator within a chamber enclosed at least in part by the CMOS cover wafer and the substrate layer of the SOI wafer, wherein bonding the CMOS cover wafer to the SOI wafer via one or more eutectic solder bonds that implement respective paths of electrical conductivity between the CMOS cover wafer and the SOI wafer comprises forming a first eutectic solder bond that implements a path of electrical conductivity between respective contact regions within the SOI wafer and CMOS cover wafer; and forming, as the contact region within the CMOS cover wafer, a contact region that extends between opposite surfaces of the CMOS cover wafer. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. A method of fabricating a microelectromechanical system (MEMS) device, the method comprising:
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forming a MEMS resonator within a semiconductor layer of a semiconductor-on-insulator (SOI) wafer; and bonding a complementary metal oxide semiconductor (CMOS) cover wafer to the SOI wafer via one or more eutectic solder bonds that (i) implement respective paths of electrical conductivity between the CMOS cover wafer and the SOI wafer, and (ii) hermetically seal the MEMS resonator within a chamber enclosed at least in part by the CMOS cover wafer and the substrate layer of the SOI wafer, wherein bonding the CMOS cover wafer to the SOI wafer via one or more eutectic solder bonds that implement respective paths of electrical conductivity between the CMOS cover wafer and the SOI wafer comprises forming a first eutectic solder bond that implements a path of electrical conductivity between respective contact regions within the SOI wafer and CMOS cover wafer; and forming a via within the CMOS cover wafer to implement the contact region within the CMOS cover wafer.
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9. A microelectromechanical system (MEMS) device comprising:
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a semiconductor-on-insulator (SOI) substrate having (i) first and second semiconductor layers separated by an insulation layer, a MEMS resonator formed within the first semiconductor layer; and a complementary metal oxide semiconductor (CMOS) cover substrate bonded to the SOI substrate via one or more eutectic solder bonds that (i) implement respective paths of electrical conductivity between the CMOS cover substrate and the MEMS substrate, and (ii) hermetically seal the MEMS resonator within a chamber enclosed at least in part by the CMOS cover substrate and the second semiconductor layer of the SOI substrate, wherein the SOI substrate and the CMOS cover substrate comprise counterpart contact regions and wherein the one or more eutectic solder bonds that implement respective paths of electrical conductivity between the CMOS cover substrate and the SOI substrate comprise a first eutectic solder bond that implements a path of electrical conductivity between the counterpart contact regions within the SOI substrate and the CMOS cover substrate and wherein the contact region within the CMOS cover substrate extends between opposite surfaces of the CMOS cover substrate. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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10. A microelectromechanical system (MEMS) device comprising:
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a semiconductor-on-insulator (SOI) substrate having (i) first and second semiconductor layers separated by an insulation layer, a MEMS resonator formed within the first semiconductor layer; and a complementary metal oxide semiconductor (CMOS) cover substrate bonded to the SOI substrate via one or more eutectic solder bonds that (i) implement respective paths of electrical conductivity between the CMOS cover substrate and the MEMS substrate, and (ii) hermetically seal the MEMS resonator within a chamber enclosed at least in part by the CMOS cover substrate and the second semiconductor layer of the SOI substrate, wherein the SOI substrate and the CMOS cover substrate comprise counterpart contact regions and wherein the one or more eutectic solder bonds that implement respective paths of electrical conductivity between the CMOS cover substrate and the SOI substrate comprise a first eutectic solder bond that implements a path of electrical conductivity between the counterpart contact regions within the SOI substrate and the CMOS cover substrate and wherein the contact region within the CMOS cover substrate comprises a conductive via.
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Specification