US20060019468A1 - Method of manufacturing a plurality of electronic assemblies - Google Patents

Method of manufacturing a plurality of electronic assemblies Download PDF

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Publication number
US20060019468A1
US20060019468A1 US10/897,067 US89706704A US2006019468A1 US 20060019468 A1 US20060019468 A1 US 20060019468A1 US 89706704 A US89706704 A US 89706704A US 2006019468 A1 US2006019468 A1 US 2006019468A1
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Prior art keywords
wafer
assembly
carrier
underfill material
combination
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Abandoned
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US10/897,067
Inventor
John Beatty
Jason Garcia
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Intel Corp
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Intel Corp
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Priority to US10/897,067 priority Critical patent/US20060019468A1/en
Assigned to INTEL CORPORATION reassignment INTEL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BEATTY, JOHN J., GARCIA, JASON A.
Publication of US20060019468A1 publication Critical patent/US20060019468A1/en
Application status is Abandoned legal-status Critical

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L25/00Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/50Multistep manufacturing processes of assemblies consisting of devices, each device being of a type provided for in group H01L27/00 or H01L29/00
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer, carrier concentration layer
    • H01L21/50Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
    • H01L21/56Encapsulations, e.g. encapsulation layers, coatings
    • H01L21/563Encapsulation of active face of flip-chip device, e.g. underfilling or underencapsulation of flip-chip, encapsulation preform on chip or mounting substrate
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L23/00Details of semiconductor or other solid state devices
    • H01L23/28Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
    • H01L23/31Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
    • H01L23/3107Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed
    • H01L23/3114Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed the device being a chip scale package, e.g. CSP
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732Location after the connecting process
    • H01L2224/73201Location after the connecting process on the same surface
    • H01L2224/73203Bump and layer connectors
    • H01L2224/73204Bump and layer connectors the bump connector being embedded into the layer connector
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L2225/00Details relating to assemblies covered by the group H01L25/00 but not provided for in its subgroups
    • H01L2225/03All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L51/00
    • H01L2225/04All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L51/00 the devices not having separate containers
    • H01L2225/065All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L51/00 the devices not having separate containers the devices being of a type provided for in group H01L27/00
    • H01L2225/06503Stacked arrangements of devices
    • H01L2225/06513Bump or bump-like direct electrical connections between devices, e.g. flip-chip connection, solder bumps
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L25/00Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L51/00, e.g. assemblies of rectifier diodes
    • H01L25/04Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L51/00, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/065Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L51/00, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L27/00
    • H01L25/0657Stacked arrangements of devices
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/19Details of hybrid assemblies other than the semiconductor or other solid state devices to be connected
    • H01L2924/1901Structure
    • H01L2924/1904Component type
    • H01L2924/19041Component type being a capacitor

Abstract

A method of manufacturing a plurality of electronic devices is provided. Each one of a plurality of first conductive terminals on a plurality of integrated circuits formed on a device wafer is connected to a respective one of a plurality of second conductive terminals on a carrier wafer, thereby forming a combination wafer assembly. The combination wafer assembly is singulated between the integrated circuits to form separate electronic assemblies. Each electronic assembly has a respective die from a separated portion of the device wafer and a carrier substrate from a separated portion of the carrier wafer. The process of fabricating electronic assemblies is simplified and costs are reduced because the dies are connected to the carrier substrate at wafer level, i.e. before singulation. The combination wafer assembly also allows for an underfill material to be introduced and to cured at wafer level and for thinning of the device wafer at wafer level without requiring a separate supporting substrate. Alignment between the device wafer and the carrier wafer can be tested by conducting a current through first and second conductors in the device and carrier wafers, respectively.

Description

    BACKGROUND OF THE INVENTION
  • 1). Field of the Invention
  • This invention relates generally to a method of manufacturing a plurality of electronic assemblies, and more specifically to improvements in fabrication at water level.
  • 2). Discussion of Related Art
  • Integrated circuits are usually manufactured in and on semiconductor wafers. Such an integrated circuit has millions of tiny electronic components such as transistors, capacitors, and diodes that are interconnected with conductive lines, plugs, and vias.
  • One wafer typically has an array of identical circuits formed thereon. The wafer was is then “singulated” or “diced” by directing a blade through scribe streets between the integrated circuits, thereby separating the wafer into the individual dice. Each die is then separately mounted to a respective carrier substrate for purposes of providing structural rigidity to the die and to provide power, ground, and signals to and from the die.
  • A plurality of conductive terminals are formed on the integrated circuits before the wafer is singulated. Such terminals are typically solder bumps that are formed according to a conventional “controlled collapsed chip connect” (C4) process. After the wafer is singulated, each one of the bumps is placed on a respective contact of the carrier substrate. The bumps are then reflowed so that they are structurally and electrically connected to the contacts. The process is repeated to connect each die singulated from the wafer to a separate carrier substrate to form separate electronic assemblies. Downstream fabrication is then separately carried out on each separate electronic assembly.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention is described by way of examples with reference to the accompanying drawings, wherein:
  • FIG. 1 is a cross-sectional side view of first and second wafer assemblies that are used for forming a combination wafer assembly, according to an embodiment of the invention;
  • FIG. 2 is a view similar to FIG. 1 after the first and second wafer assemblies are connected to one another by reflowing the first and second terminals of respectively the first and second wafer assemblies with one another to form combined terminals;
  • FIG. 3 is a view similar to FIG. 2, further illustrating a system that is used to introduce an underfill material into a space between the combined terminals;
  • FIG. 4 is a view similar to FIG. 3 of a portion of the combination wafer, illustrating how alignment between the first and second wafer assemblies is tested;
  • FIG. 5 is a view similar to FIG. 2, further illustrating how a device wafer of the first wafer assembly is thinned without the need to laminate the first wafer to a supporting substrate;
  • FIG. 6 is a view similar to FIG. 2, further illustrating how the combination wafer assembly is singulated into a plurality of electronic assemblies; and
  • FIGS. 7A, 7B, and 7C are views similar to FIG. 6, further illustrating packages that can be made from the electronic assemblies that are singulated out of the combination wafer as illustrated in FIG. 6.
  • DETAILED DESCRIPTION OF THE INVENTION
  • A method of manufacturing a plurality of electronic devices is provided. Each one of a plurality of first conductive terminals on a plurality of integrated circuits formed on a device wafer is connected to a respective one of a plurality of second conductive terminals on a carrier wafer, thereby forming a combination wafer assembly. The combination wafer assembly is singulated between the integrated circuits to form separate electronic assemblies. Each electronic assembly has a respective die from a separated portion of the device wafer and a carrier substrate from a separated portion of the carrier wafer. The process of fabricating electronic assemblies is simplified and costs are reduced because the dies are connected to the carrier substrate at wafer level, i.e., before singulation. The combination wafer assembly also allows for an underfill material to be introduced and to cured at wafer level and for thinning of the device wafer at wafer level without requiring a separate supporting substrate. Alignment between the device wafer and the carrier wafer can be tested by conducting a current through first and second conductors in the device and carrier wafers, respectively.
  • FIG. 1 of the accompanying drawings illustrates first and second wafer assemblies 10 and 12 that are used for manufacturing a combination wafer assembly and a plurality of electronic assemblies from the combination wafer assembly, according to an embodiment of the invention.
  • The first wafer assembly 10 includes a device wafer 14, a plurality of integrated circuits 16 formed on the device wafer 14, and a plurality of conductive first terminals 18 formed on each one of the integrated circuits 16. The device wafer 14 is made of a semiconductor material such as silicon. The integrated circuits 16 are typically identical to one another. Each integrated circuit 16 has a multitude of electronic elements such as transistors, capacitors, diodes, etc., formed in and on the material of the device wafer 14. Each integrated circuit 16 has a plurality of alternating dielectric and metal layers formed above one another. The metal layers are patterned to form metal lines that interconnect the electronic components to one another. The first terminals 18 are bumps that are formed on the integrated circuit and connected through the metal lines, plugs and vias to the electronic components. The bumps are typically formed according to a conventional controlled collapsed chip connect (C4) process. The integrated circuits 16 are separated from one another by scribe streets 20. A metal guard ring (not shown) typically surrounds each integrated circuit 16 to protect the respective integrated circuit 16 from delamination during downstream sawing or other singulation.
  • The second wafer assembly 12 includes a carrier wafer 22, typically of a strong material such as ceramic, and a second plurality of conductive terminals 24 formed on a lower surface of the carrier wafer 22. The carrier wafer 22 is typically made of a ceramic material and has metal lines, plugs, and vias formed in the ceramic material for purposes of electric communication. The second terminals 24 are connected to the conductive metal lines, plugs, and vias. The second terminals 24 are typically made utilizing a C4 process.
  • The layout of the second terminals 24 is a mirror image of the layout of the first terminals 18, and each one of the second terminals 24 is located directly above a respective one of the first terminals 18. The second wafer assembly 12 is then lowered onto the first wafer assembly 10 so that a respective one of the second terminals 24 is in contact with a respective one of the first terminals 18. The combination is then heated to a temperature above a melting temperature of the first terminals 18 and 24, so that each one of the second terminals 24 reflows together with the respective one of the first terminals 18. The combination is then allowed to cool, so that the reflowed terminals again solidify.
  • FIG. 2 illustrates a combination wafer assembly 28 that results after the first and second terminals 18 and 24 of FIG. 1 are reflowed together and allowed to cool. Combined terminals 30 are formed that interconnect the integrated circuits 16 with the carrier wafer 22. A space 32 is maintained between the integrated circuits 16 and the carrier wafer 22, and a volume between the combined terminals 30 is filled with a gas, typically air.
  • It can be seen that the integrated circuits 16 are connected to the carrier wafer 22 without first singulating the first wafer assembly 10. Wafer-level interconnection simplifies the entire assembly process, thereby reducing cost. Wafer level interconnection also allows for downstream manufacture, including the introduction of underfill material and wafer thinning, to be carried out at wafer level, thereby further simplifying the entire process and further reducing cost.
  • FIG. 3 illustrates a system 34 that is used to introduce an underfill material into the space 32 of the combination wafer assembly 28. The system 34 includes a jig 36, having upper and lower parts 38 and 39, a reservoir 40 for underfill material 42, a pump 44, and a heater 46.
  • That lower part 39 of the jig 36 has a recess in which the combination wafer assembly 28 is received. Sidewalls 48 of the lower part 39 surround the combination wafer assembly 28, in particular the space 32. First and second passages 50 and 52 are formed through the sidewalls 48 and into and out of the space 32. The reservoir 40 is connected through that pump 44 to the first passage 50 to allow for the underfill material 42 to be pumped by the pump 44 into the first passage 50. The heater 46 is located in a position to heat the underfill material before being provided to the first passage 50.
  • The upper part 38 of the jig 36 is located on top of the combination wafer assembly 28, the upper and lower parts 38 and 39 thereby forming a sealed enclosure around the combination wafer assembly 28, except for the first and second passages 50 and 52.
  • In use, the pump 44 is operated to pump the underfill material 42 out of the reservoir 40 past the heater 46. The heater 46 then heats the underfill material 42 to lower its viscosity. The heated underfill material 42 then flows above atmospheric pressure through the first passage 50 into the space 32. A gas located in the space 32 is vented through the second passage 52. The process is continued until the space 32 is entirely filled with the underfill material 42. It may be possible to provide more inlet passages than just the first passage 50 and/or more outlet passages than just the second passage 52, and that the passages can be placed at select locations to tailor flow through the space 32.
  • After the underfill material 42 is introduced at wafer level, the combination wafer assembly 28 may be removed from the jig 36. The combination wafer assembly 28, with the underfill material 42 in the space 32, can then be transported through a furnace. The underfill material 42 is heated to a select temperature and for a predetermined period of time to cure the underfill material 42, also at wafer level.
  • FIG. 4 illustrates how alignment between the first and second wafer assemblies 10 and 12 is tested before the combination wafer assembly 28 is singulated. First and second conductors 53 and 54 are formed through the device wafer 14 and the carrier wafer 22, respectively. Both conductors 53 and 54 are connected to one of the combined terminals 30 if the second wafer assembly 12 has been properly aligned with the first wafer assembly 10. No current will conduct if the second wafer assembly 12 is misaligned with respect to the first wafer assembly 10. A circuit is completed by connecting the second conductor 54 through a power supply such as a battery 60, a resistor 62, and a current meter 64 to the first conductor 53. A current will be displayed on the current meter 64 if the first and second wafer assemblies 10 and 12 are correctly aligned.
  • As illustrated in FIG. 5, the combination wafer assembly 28 also allows for thinning of the device wafer 14 without the need to laminate the first wafer assembly 10 to a supporting substrate, due to the strength provided by the ceramic carrier wafer 22. The carrier wafer 22 is attached to a polishing chuck 70. The polishing chuck 70 is then used to place the combination wafer assembly 28 with the device wafer 14 contacting a polishing pad 72. The polishing chuck 70 and polishing pad 72 are then moved, typically rotated, relative to one another so that a lower surface of that device wafer 14 moves over an upper surface of the polishing pad 72. An upper surface of the polishing pad 72 is abrasive so that lower portions of the device wafer 14 are removed. The device wafer 14 is so thinned down. The combination wafer assembly 28 is then removed from the polishing pad 72 and the polishing chuck 70.
  • As illustrated in FIG. 6, the combination wafer assembly 28 is subsequently singulated into individual electronic assemblies 74. A blade 76 is directed in x- and y-directions through the scribe streets 20 and through the carrier wafer 22. Each electronic assembly 74 then has a respective die 78 from a respective portion of the device wafer 14 and one of the integrated circuits 16 on the respective die 78. Each electronic assembly 74 also has a respective carrier substrate 79 from a respective portion of the carrier wafer 22. The combination wafer assembly 28 is thus singulated after interconnection as illustrated in FIG. 2, the introduction of an underfill material as illustrated in FIG. 3, alignment testing as illustrated in FIG. 4, and thinning as illustrated in FIG. 5.
  • FIGS. 7A, 7B, and 7C illustrate various assembly packages 80 that can be made from one of the electronic assemblies 74. Each one of the packages 80 includes a further substrate 82 that is made from a laminate of conductive and dielectric layers. In the embodiments of FIGS. 7A and 7C, the additional substrate 82 is formed directly on the electronic assembly 74. In the embodiment of FIG. 7B, additional conductive contacts interconnect the electronic assembly 74 with the additional substrate 82.
  • While certain exemplary embodiments have been described and shown in the accompanying drawings, it is to be understood that such embodiments are merely illustrative and not restrictive of the current invention and that this invention is not restricted to the specific constructions and arrangements shown and described since modifications may occur to those ordinarily skilled in the art.

Claims (18)

1. A method of manufacturing a of plurality of electronic assemblies, comprising:
connecting each one of a plurality of first conductive terminals on a plurality of integrated circuits formed on a device wafer to a respective one of a plurality of second conductive terminals on a carrier wafer to form a combination wafer assembly; and
singulating the combination wafer assembly between the integrated circuits to form the electronic assemblies, each electronic assembly having a respective die from a separated portion of the device wafer and a carrier substrate from a separated portion of the carrier wafer.
2. The method of claim 1, further comprising:
introducing an underfill material that is located between the device wafer and the carrier wafer before singulating the combination wafer assembly; and
curing the underfill material.
3. The method of claim 2, wherein the underfill material is introduced into a space between the device wafer and carrier wafer after connecting the first conductive terminals to the second conductive terminals.
4. The method of claim 3, wherein the underfill material is introduced into the space at above atmospheric pressure.
5. The method of claim 4, further comprising:
placing the combination wafer assembly in a jig; and
providing the underfill material through at least a first passage in the jig.
6. The method of claim 4, further comprising:
heating the underfill material before introducing the underfill material into the space.
7. The method of claim 2 wherein the underfill material is cured before singulating the combination wafer assembly.
8. The method of claim 1, further comprising:
thinning the device wafer before singulating the combination wafer assembly.
9. The method of claim 8, further comprising:
introducing an underfill material that is located between the device wafer and the carrier wafer before singulating the combination wafer assembly; and
curing the underfill material.
10. The method of claim 8, wherein the carrier wafer is made of ceramic.
11. The method of claim 1, further comprising:
testing a current through at least one pair, the pair including a first conductive terminal and a second conductive terminal before singulating the combination wafer assembly.
12. The method of claim 11, wherein current is provided through a first conductor extending through the device wafer and through a second conductor extending through that carrier wafer.
13. A method of manufacturing a plurality of electronic assemblies, comprising:
introducing an underfill material between a device wafer and a carrier wafer that form a combination wafer assembly;
curing the underfill material; and
singulating the combination wafer assembly between integrated circuits formed on the device wafer to form the electronic assemblies, each electronic assembly having a respective die from a separated portion of the device wafer and a respective carrier substrate from a separated portion of the carrier wafer, and a respective portion of the underfill material between the respective die and the respective carrier substrate.
14. The method of claim 13, wherein the underfill material is cured before singulating the combination wafer assembly.
15. The method of claim 13, wherein the underfill material is introduced between the device wafer and carrier wafer at above atmospheric pressure.
16. A combination wafer assembly, comprising:
a device wafer;
a plurality of integrated circuits formed on the device wafer;
a plurality of first conductive terminals on the integrated circuits;
a carrier wafer; and
a plurality of second conductive terminals on the carrier wafer, each being connected to a respective one of the first conductive terminals.
17. The combination wafer assembly of claim 16, wherein the integrated circuits are identical to one another.
18. The combination wafer assembly of claim 16, further comprising:
a plurality of interconnection elements connecting each one of the first conductive terminals to each one of the second conductive terminals; and
an underfill material in a space between the device wafer and the carrier wafer and between the interconnection elements, the underfill material having been cured.
US10/897,067 2004-07-21 2004-07-21 Method of manufacturing a plurality of electronic assemblies Abandoned US20060019468A1 (en)

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US10/897,067 US20060019468A1 (en) 2004-07-21 2004-07-21 Method of manufacturing a plurality of electronic assemblies
CN 200580024550 CN1989613A (en) 2004-07-21 2005-07-08 A method of manufacturing a plurality of electronic assemblies
PCT/US2005/024487 WO2006019674A2 (en) 2004-07-21 2005-07-08 A method of manufacturing a plurality of electronic assemblies
DE112005001736T DE112005001736B4 (en) 2004-07-21 2005-07-08 A process for producing a plurality of electronic assemblies, and combination wafer assembly
JP2007522545A JP4696115B2 (en) 2004-07-21 2005-07-08 Method of manufacturing a plurality of electronic assemblies
TW94123440A TWI285923B (en) 2004-07-21 2005-07-11 A method of manufacturing a plurality of electronic assemblies
US13/620,477 US8709869B2 (en) 2004-07-21 2012-09-14 Method of manufacturing a plurality of electronic assemblies

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JP4696115B2 (en) 2011-06-08

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