US20150056783A1 - Systems and methods for molecular bonding of substrates - Google Patents
Systems and methods for molecular bonding of substrates Download PDFInfo
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- US20150056783A1 US20150056783A1 US14/334,328 US201414334328A US2015056783A1 US 20150056783 A1 US20150056783 A1 US 20150056783A1 US 201414334328 A US201414334328 A US 201414334328A US 2015056783 A1 US2015056783 A1 US 2015056783A1
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- 238000000034 method Methods 0.000 title claims abstract description 29
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- 241000252254 Catostomidae Species 0.000 claims description 9
- 230000000284 resting effect Effects 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 22
- 239000011521 glass Substances 0.000 description 22
- 229910052710 silicon Inorganic materials 0.000 description 22
- 239000010703 silicon Substances 0.000 description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 230000004888 barrier function Effects 0.000 description 5
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000012431 wafers Nutrition 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 230000005660 hydrophilic surface Effects 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000002513 implantation Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
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- 230000000644 propagated effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/185—Joining of semiconductor bodies for junction formation
- H01L21/187—Joining of semiconductor bodies for junction formation by direct bonding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67132—Apparatus for placing on an insulating substrate, e.g. tape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/7624—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology
- H01L21/76251—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
Definitions
- the field of this invention is that of Silicon-On-Glass (SiOG) structures. More precisely, the invention relates to an improved method for making such structures.
- SiOG Silicon-On-Glass
- SOI wafers consist of a thin useful layer of substantially single crystal silicon having a thickness that generally is less than one micron, with the layer supported on an insulating material.
- structures and various ways of obtaining such wafers are known.
- structures used are formed with a thin film of silicon bonded to another silicon wafer with an oxide insulator layer in between.
- SiOG structures SOI structures using such glass-based substrates are called SiOG structures, as already mentioned.
- Processes for providing an SiOG structure are, for example, described by U.S. Pat. No. 7,176,528. Such a process is represented by FIG. 1 .
- a source substrate 1 b generally made of silicon, is implanted with ionic species such as hydrogen. The implantation leads to the creation of a buried, weakened zone 7 . Further, the source substrate 1 b is bonded with a glass-based support substrate 1 a and then separated by splitting the source substrate 1 b to a depth corresponding to the penetration depth of the implanted species. In this way, an SiOG structure containing the original glass-based support substrate 1 a and a layer 8 from the source substrate 1 b , and a remaining delaminated substrate being a part of the former source substrate 1 b are produced.
- a glass-based support substrate 1 a generally contains metals (in particular, alkali metals) and other components, which may be harmful to silicon or other semiconductor materials of the useful layer 8 from the source substrate 1 b . Therefore, a barrier layer is generally required between the glass-based support substrate 1 a and the source substrate 1 b . Moreover, this barrier layer may facilitate the bonding between the silicon layer 8 and the glass-based support substrate 1 a by making hydrophilic the bonding surface of the silicon layer 8 . In this regard, a SiO 2 layer can be used as a barrier layer to obtain hydrophilic surface conditions between the glass-based support substrate 1 a and the silicon layer 8 .
- a native SiO 2 layer can be directly formed on a silicon source substrate 1 b by exposing it to the atmosphere prior to bonding.
- the anodic bonding process produces “in situ” a SiO 2 layer between the silicon source substrate 1 b and the glass-based support substrate 1 a .
- a SiO 2 layer can be actively deposited or grown on the source substrate 1 b prior to bonding.
- U.S. Pat. No. 7,176,528 discloses another type of a barrier layer, which can be provided by the anodic bonding process.
- This barrier layer is a modified top layer of glass in the glass-based support substrate 1 a , namely, a glass layer having a reduced level of ions.
- the disclosed anodic bonding substantially removes alkali and alkali earth glass constituents and other positive modifier ions that are harmful for silicon for a distance of about 100 nm to form a thick top layer on the glass-based support substrate 1 a.
- the present invention now provides high quality bubble-free bonded substrates of silicon and glass. Moreover, the present invention also aims at providing an efficient bonding of a series of substrates, in order to speed up industrial processes and save cost.
- the present invention provides a method for bonding a first substrate having a first surface to a second substrate having a second surface, characterized in that it comprises:
- the surface area of a convex hull formed by the set of pressure points is null and the surface area of the convex hull formed by the set of support and pressure points is non-null;
- the first substrate is held by suckers or suction cups placed at the support points,
- each sucker or suction cup is linked to a telescopic arm
- the second substrate is placed on a support comprising at least two spacers respectively on each sides of the second substrate, the at least two spacers being higher than the thickness of the second substrate;
- the first substrate is held by resting on the spacers, the support points being points of contact between the spacers and the first substrate;
- the support comprises at least one sucker or suction cup for holding the second substrate;
- the strain is applied by at least one piston rod
- the first substrate is a glass sheet, and wherein the second substrate is a silicon tile;
- the first substrate is sequentially bonded to a plurality of second substrates by applying a strain to the first substrate per second substrate;
- the at least one piston rod is mounted on a mobile device and sequentially applies each strain to the first substrate;
- the first substrate is simultaneously bonded to a plurality of second substrates by deforming the whole first substrate.
- FIG. 1 previously described represents steps of a known process for making SiOG structures
- FIG. 2 previously described is a traversal view of a detail of a defect due to the presence of a bubble in an SOI structure
- FIG. 3 represents a bonding propagation wave during a molecular bonding
- FIG. 4 represents an embodiment of a step of holding a substrate in a process according to the invention
- FIGS. 5 a - 5 e represent an alternative embodiment of a step of holding a substrate in a process according to the invention
- FIGS. 6 a - 6 d represent successive steps of an embodiment of a process according to the invention.
- FIGS. 7 a and 7 b are upper views of alternative possible dispositions of substrates on a support in an embodiment of a process according to the invention.
- FIGS. 8 a - 8 f represent successive steps of another embodiment of a process according to the invention.
- the bonding wavefront is the curve delimiting at a given time the area already bonded (i.e., already traveled by the bonding wave), and extending toward unbounded areas by molecular attraction. A bubble is trapped if two distinct points of this curve join, thereby surrounding an unbound area. As air cannot escape from such a surrounded unbound area, the bonding wavefront stops. So, at any moment, the bonding wavefront has to be continuous.
- the bonding starts by a contact at the point P 1 .
- the bonding wavefront radially extents: L(t 1 ), L(t 2 ) and L(t 3 ) represent the position of the bonding wavefront at three instants t 1 ⁇ t 2 ⁇ t 3 . From the central bonding initiation, the bonding wavefront extends up to the edges of the second substrate 1 b , expelling the air without trapping it.
- the invention proposes a method for bonding a first substrate 1 a having a first surface 2 a to a second substrate 1 b having a second surface 2 b, in which the propagation of the bonding wave is controlled.
- the first substrate 1 a is held by at least two support points S 1 and S 2 , positioned near (e.g., 100 to 1000 microns) the second substrate 1 b so that first surface 2 a and second surface 2 b face each other.
- the first substrate 1 a is deformed in order to have a single contact between the two surfaces 2 a and 2 b.
- This deformation is obtained by applying between at least one pressure point P 1 different from the two support points S 1 and S 2 a strain F toward the second substrate 1 b , and then bringing the deformed first surface 2 a and the second surface 2 b into contact.
- the deformation may be performed until the deformed first surface 2 a and the second surface 2 b get into contact, or alternatively, the first substrate 1 a may be deformed, and then its first surface 1 a brought into contact with the second surface 2 a by translation once the deformation is complete. From this contact, which is located at the pressure point P 1 , the bonding wave is initiated.
- the warpage of the first substrate 1 a is about a few hundreds of micrometers, which is very small compared to the lateral dimensions of typically used substrates, i.e., a few hundreds of millimeters.
- the force needed for obtaining a warpage of 200 microns in the middle of a 775 micron thick silicon substrate having a surface of 20 cm ⁇ 20 cm and supported at its edges is about 1.3 N
- the force needed for obtaining a warpage of 200 microns in the middle of a 500 micron thick silicon substrate having a surface of 20 cm ⁇ 20 cm and supported at its edges is about 0.2 N.
- a first embodiment is represented in FIG. 4 .
- the first substrate 1 a is held at four support points S 1 , S 2 , S 3 and S 4 by a vacuum system, a sucker or suction cup 3 being placed at each support point.
- the first substrate 1 a is then positioned within a few tenths of millimeters above the second substrate 1 b.
- FIGS. 5 a - 5 e show alternative geometries for support and pressure points that enable initiating the propagation of the bonding wave at different locations. Only two support points are required. The invention is not limited to any one of these geometries, and one skilled in the art would know how to place support and pressure points according to the shape and the material of the first substrate 1 a.
- the geometry of support and pressure points may, for example, respect two conditions:
- the first substrate 1 a is then bent by applying the strain F between the at least one pressure point P 1 and the support points S 1 , S 2 , for example, thanks to the movement of a piston rod 5 in contact with the first substrate 1 a at the pressure point P 1 .
- the contact between the piston rod 5 and the first substrate 1 a may be linear and not punctual, according to the second condition explained above.
- the strain F is applied between the support points (S 1 , S 2 ) and a pressure line P.
- the applied strain deforms the first substrate 1 a such that a central portion of the first substrate portion initially contacts the second substrate surface.
- the strain F is applied in a linear manner the central portion of the first substrate 1 a contacts the second substrate 1 b in a line of contact.
- the strain F can be progressively released to propagate a bonding wave, which bonds the substrates 1 a , 1 b together. This final step of releasing the strain F facilitates bonding of the substrates while minimizing or avoiding the trapping of air bubbles between the substrates 1 a , 1 b .
- the release of the strain F to let the bonding wave propagate can be conducted in a number of ways.
- a first considered possibility is to simply release the vacuum at one stroke and provoke a high-speed propagation of the bonding wave. It was found, however, that this propagation is faster at the edge of the substrate than elsewhere. Thus, lateral parts of the bonding wavefront might join, whereas the central part has not yet reached the edge of the substrate and this might cause the trapping of air bubbles.
- suckers or suction cups 3 may be, for example, mounted on telescopic aims 4 .
- the first substrate 1 a is bonded to a plurality of second substrates 1 b.
- the first substrate 1 a is, for example, a glass sheet, while the second substrate 1 b is a silicon tile. Large sheets of glass can be easily manufactured, so that they can receive a plurality of silicon substrates, as the substrates have generally a width between 20 cm and 30 cm.
- the invention is not limited to the bonding of glass and silicon substrates.
- FIGS. 6 a - 6 d schematically represent a bonding sequence of a first substrate 1 a and a plurality of second substrates 1 b according to a second advantageous embodiment of the invention.
- the second substrates 1 b are pre-positioned on a support 10 and maintained by an optional vacuum system of suckers or suction cups 12 .
- the first substrate 1 a is then positioned and laid on spacers 11 located on each side of the second substrates 1 b (i.e., between two rows). These spacers 11 have a height exceeding the thickness of the second substrates 1 b , preferably by at least 200 ⁇ m. In the case of silicon tiles having a thickness of e.g., 775 ⁇ m, the height of spacers 11 therefore reaches at least 975 ⁇ m.
- the spacers 11 are support lines for the first substrate 1 a (there may however be a succession of dots instead).
- the piston rod 5 applies the strain F.
- the piston rod 5 can get in a punctual contact at the center of each tile or get in a linear contact ( FIGS. 7 a and 7 b ).
- the strain applied by piston rods 5 will then bend the first substrate 1 a in between the linear spacers 11 .
- the mechanical contact is then obtained for the one or several second substrate(s) 1 b positioned between the spacers 11 and the first substrate 1 a .
- the nine tiles shown on FIG. 7 a may, for example, be bonded all the nine simultaneously (using nine pistons, or using three linear contact rods, not shown), or, for example, row by row (using three pistons as shown in FIG. 7 a ), or, for example, one by one (using one piston, not shown).
- the sucker or suction cup 12 is then released, so the second substrate 1 b becomes only held by the pressure point P 1 where molecular bonding is made,
- the piston rod 5 is thus progressively shortened, the second substrate 1 b rising up from the support 10 as the bonding wavefront extends ( FIG. 6 c ).
- the bonding wave speed With a deformation of the first substrate 1 a corresponding to a displacement of its edges with respect to the pressure point P 1 of at least 200 ⁇ m (due to the height of each spacer 11 ), it is possible to control the bonding wave speed so that the bonding wave velocity ideally in each point of the bonding interface does not exceed the minimum bonding wave velocity that is observed in the center area of the bonding interface during an uncontrolled bonding, to prevent the formation of bubbles.
- the invention enables the bonding wave speed velocity to be reduced in the center, as well as in the periphery of the bonding interface.
- the bonding ends when the piston rod 5 reaches again its start position.
- the bonding wave has propagated over the whole surface of the second substrate 1 b ( FIG. 6 d )
- the method can then be applied on the next second substrate 1 b or line of second substrates 1 b .
- the piston rod 5 is mounted on a mobile device 6 .
- This mobile device 6 is, for example, a 3-axis robot. It can move from one first line of substrates 1 b to another and sequentially applies the strain F to them.
- the whole first substrate 1 a is deformed, and it is bound simultaneously to the plurality of second substrates 1 b .
- the bonding sequence begins with a step of pre-positioning the substrates 1 a , 1 b .
- the first substrate 1 a is held under vacuum by suckers or suction cups 3 at the extremity of telescopic arms 4 above a plurality of second substrates 1 b , which lay on the support 10 .
- Each second substrate 1 b may be held by at least one sucker or suction cup 12 embedded in the support 10 .
- the center of the first surface 2 a of substrate 1 a is kept at least 100 ⁇ m above from surfaces 2 b of the second substrates 1 b.
- a central element for example, a piston rod 5
- a piston rod 5 is in contact with the substrate 1 a at the pressure point P 1 .
- Suckers or suction cups 3 and telescopic arms 4 are movable in rotation so that the substrate 1 a can take a free form, imposed only by the support points S 1 and S 2 of contact between the substrate ( 1 a ) and the suckers or suction cups 3 , and the pressure point P 1 of contact with the head of the piston rod 5 .
- the strain F is applied and the pressure point P 1 gets closer to the substrates 1 b , as represented by FIG. 8 b.
- a contact force of less than 10 N (e.g., 2-10 N) is applied to begin the molecular bonding ( FIG. 8 c ).
- the bonding propagation wave is then initiated by gradual release of the bending imposed on the first substrate 1 a .
- the telescopic aims 4 are lengthened ( FIG. 8 d ). The speed of this release is limited so that a uniform bonding wavefront propagates between the two substrates 1 a and 1 b.
- auxiliary piston rods 5 ′ embedded in the structure 10 initiate bonding waves on the other second substrates 1 b .
- the bonding sequence ends when the strains applied on the entire first substrate 1 a are released ( FIG. 8 f ).
- This embodiment of the method according to the invention enables a high-speed industrial process, as a plurality of silicon tiles can be bound at once. Moreover, as only a small number of handlings are required, such a method guarantees a very precise bonding, leading to high-quality products.
- suckers or suction cups this is intended to include other vacuum members or devices that are able to provide suction for holding the substrates.
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Abstract
A method for bonding a first substrate having a first surface to a second substrate having a second surface. This method includes the steps of holding the first substrate by at least two support points, positioning the first substrate and the second substrate so that the first surface and the second surface face each other, deforming the first substrate by applying between at least one pressure point and the two support points a strain toward the second substrate, bringing the deformed first surface and the second surface into contact, and progressively releasing the strain to facilitate bonding of the substrates while minimizing or avoiding the trapping of air bubbles between the substrates.
Description
- This application is a continuation of U.S. patent application Ser. No. 13/953,679, filed Jul. 29, 2013, pending, which application is a continuation of U.S. patent application Ser. No. 13/248,763, filed Sep. 29, 2011, now U.S. Pat. No. 8,580,654, issued Nov. 12, 2013, the disclosure of each of which is expressly incorporated herein in its entirety by this reference.
- The field of this invention is that of Silicon-On-Glass (SiOG) structures. More precisely, the invention relates to an improved method for making such structures.
- Silicon-On-Insulator (SOI) technology is becoming increasingly important for high performance thin film transistors, solar cells, etc. SOI wafers consist of a thin useful layer of substantially single crystal silicon having a thickness that generally is less than one micron, with the layer supported on an insulating material.
- Various structures and various ways of obtaining such wafers are known. Typically, structures used are formed with a thin film of silicon bonded to another silicon wafer with an oxide insulator layer in between.
- Because of its rather high thickness, in particular as compared to the other parts, a major fraction of the cost of such structures has been the cost of the silicon substrate which supports the oxide layer, topped by the thin silicon layer. Thus, to lower the cost of SOI structures, the use of a support substrate made of materials less expensive than silicon has been tried, in particular glass or glass-ceramics.
- SOI structures using such glass-based substrates are called SiOG structures, as already mentioned. Processes for providing an SiOG structure are, for example, described by U.S. Pat. No. 7,176,528. Such a process is represented by
FIG. 1 . Asource substrate 1 b, generally made of silicon, is implanted with ionic species such as hydrogen. The implantation leads to the creation of a buried, weakenedzone 7. Further, thesource substrate 1 b is bonded with a glass-basedsupport substrate 1 a and then separated by splitting thesource substrate 1 b to a depth corresponding to the penetration depth of the implanted species. In this way, an SiOG structure containing the original glass-basedsupport substrate 1 a and alayer 8 from thesource substrate 1 b, and a remaining delaminated substrate being a part of theformer source substrate 1 b are produced. - It is not a simple matter, however, to replace a traditional SOI support substrate with a glass-based support substrate. One potential issue with SiOG is that a glass-based
support substrate 1 a generally contains metals (in particular, alkali metals) and other components, which may be harmful to silicon or other semiconductor materials of theuseful layer 8 from thesource substrate 1 b. Therefore, a barrier layer is generally required between the glass-basedsupport substrate 1 a and thesource substrate 1 b. Moreover, this barrier layer may facilitate the bonding between thesilicon layer 8 and the glass-basedsupport substrate 1 a by making hydrophilic the bonding surface of thesilicon layer 8. In this regard, a SiO2 layer can be used as a barrier layer to obtain hydrophilic surface conditions between the glass-basedsupport substrate 1 a and thesilicon layer 8. - A native SiO2 layer can be directly formed on a
silicon source substrate 1 b by exposing it to the atmosphere prior to bonding. Alternatively, when anodic bonding is used, the anodic bonding process produces “in situ” a SiO2 layer between thesilicon source substrate 1 b and the glass-basedsupport substrate 1 a. Also, a SiO2 layer can be actively deposited or grown on thesource substrate 1 b prior to bonding. - U.S. Pat. No. 7,176,528 discloses another type of a barrier layer, which can be provided by the anodic bonding process. This barrier layer is a modified top layer of glass in the glass-based
support substrate 1 a, namely, a glass layer having a reduced level of ions. The disclosed anodic bonding substantially removes alkali and alkali earth glass constituents and other positive modifier ions that are harmful for silicon for a distance of about 100 nm to form a thick top layer on the glass-basedsupport substrate 1 a. - Molecular bonding is then usually performed by putting the two substrate surfaces into very close contact. Pressure is applied to the substrates by means of a mechanical piston in order to locally approach the two surfaces at a sub-nanometer scale distance. In case of hydrophilic bonding, it leads to the establishment of hydrogen bonds in between water molecules adsorbed at the two hydrophilic surfaces. With the progressive establishment of hydrogen bonds at the edges of the already bonded area, the bonded area gradually increases. A bonding wave thus propagates until it reaches the edge of at least one of the substrates. Any disturbance of the bonding wave propagation or of the bonding wave closure at the edge of a substrate may lead to the trapping of an
air bubble 9.Such air bubbles 9 locally prevent the substrates to bond, which causes holes in thelayer 8 separated from thesource substrate 1 b and bonded to the glass-basedsupport substrate 1 a, as represented inFIG. 2 . - There is consequently a need for a method for bonding the two substrates that avoids the trapping of bubbles during the molecular bonding.
- The present invention now provides high quality bubble-free bonded substrates of silicon and glass. Moreover, the present invention also aims at providing an efficient bonding of a series of substrates, in order to speed up industrial processes and save cost.
- For these purposes, the present invention provides a method for bonding a first substrate having a first surface to a second substrate having a second surface, characterized in that it comprises:
- holding the first substrate by at least two support points;
- positioning the first substrate and the second substrate so that the first surface and the second surface face each other;
- deforming the first substrate by applying between at least one pressure point and the two support points, a strain toward the second substrate;
- bringing the deformed first surface and the second surface into contact; and
- progressively releasing the strain.
- Preferred but non-limiting features of the present invention are as follow:
- the surface area of a convex hull formed by the set of pressure points is null and the surface area of the convex hull formed by the set of support and pressure points is non-null;
- the first substrate is held by suckers or suction cups placed at the support points,
- each sucker or suction cup is linked to a telescopic arm;
- the second substrate is placed on a support comprising at least two spacers respectively on each sides of the second substrate, the at least two spacers being higher than the thickness of the second substrate;
- the first substrate is held by resting on the spacers, the support points being points of contact between the spacers and the first substrate;
- the support comprises at least one sucker or suction cup for holding the second substrate;
- the strain is applied by at least one piston rod;
- the first substrate is a glass sheet, and wherein the second substrate is a silicon tile;
- the first substrate is sequentially bonded to a plurality of second substrates by applying a strain to the first substrate per second substrate;
- the at least one piston rod is mounted on a mobile device and sequentially applies each strain to the first substrate; and
- the first substrate is simultaneously bonded to a plurality of second substrates by deforming the whole first substrate.
- The above and other features and advantages of this invention will be apparent in the following detailed description of an illustrative embodiment thereof, which is to be read in connection with the accompanying drawings wherein:
-
FIG. 1 previously described represents steps of a known process for making SiOG structures; -
FIG. 2 previously described is a traversal view of a detail of a defect due to the presence of a bubble in an SOI structure; -
FIG. 3 represents a bonding propagation wave during a molecular bonding; -
FIG. 4 represents an embodiment of a step of holding a substrate in a process according to the invention; -
FIGS. 5 a-5 e represent an alternative embodiment of a step of holding a substrate in a process according to the invention; -
FIGS. 6 a-6 d represent successive steps of an embodiment of a process according to the invention; -
FIGS. 7 a and 7 b are upper views of alternative possible dispositions of substrates on a support in an embodiment of a process according to the invention; and -
FIGS. 8 a-8 f represent successive steps of another embodiment of a process according to the invention. - Referring to the drawings, a method according to a preferred embodiment of the invention will now be described.
- To avoid the trapping of bubbles, the best solution is to carefully control the propagation of the bonding wave, as represented by
FIG. 3 . Indeed, the bonding wavefront is the curve delimiting at a given time the area already bonded (i.e., already traveled by the bonding wave), and extending toward unbounded areas by molecular attraction. A bubble is trapped if two distinct points of this curve join, thereby surrounding an unbound area. As air cannot escape from such a surrounded unbound area, the bonding wavefront stops. So, at any moment, the bonding wavefront has to be continuous. - In the represented case, the bonding starts by a contact at the point P1. Then, the bonding wavefront radially extents: L(t1), L(t2) and L(t3) represent the position of the bonding wavefront at three instants t1<t2<t3. From the central bonding initiation, the bonding wavefront extends up to the edges of the
second substrate 1 b, expelling the air without trapping it. - In this context, the invention proposes a method for bonding a
first substrate 1 a having afirst surface 2 a to asecond substrate 1 b having asecond surface 2 b, in which the propagation of the bonding wave is controlled. Thefirst substrate 1 a is held by at least two support points S1 and S2, positioned near (e.g., 100 to 1000 microns) thesecond substrate 1 b so thatfirst surface 2 a andsecond surface 2 b face each other. Thefirst substrate 1 a is deformed in order to have a single contact between the twosurfaces second substrate 1 b, and then bringing the deformedfirst surface 2 a and thesecond surface 2 b into contact. The deformation may be performed until the deformedfirst surface 2 a and thesecond surface 2 b get into contact, or alternatively, thefirst substrate 1 a may be deformed, and then itsfirst surface 1 a brought into contact with thesecond surface 2 a by translation once the deformation is complete. From this contact, which is located at the pressure point P1, the bonding wave is initiated. The warpage of thefirst substrate 1 a is about a few hundreds of micrometers, which is very small compared to the lateral dimensions of typically used substrates, i.e., a few hundreds of millimeters. For instance, the force needed for obtaining a warpage of 200 microns in the middle of a 775 micron thick silicon substrate having a surface of 20 cm×20 cm and supported at its edges is about 1.3 N, and the force needed for obtaining a warpage of 200 microns in the middle of a 500 micron thick silicon substrate having a surface of 20 cm×20 cm and supported at its edges is about 0.2 N. - A first embodiment is represented in
FIG. 4 . In this advantageous embodiment, thefirst substrate 1 a is held at four support points S1, S2, S3 and S4 by a vacuum system, a sucker orsuction cup 3 being placed at each support point. Thefirst substrate 1 a is then positioned within a few tenths of millimeters above thesecond substrate 1 b. -
FIGS. 5 a-5 e show alternative geometries for support and pressure points that enable initiating the propagation of the bonding wave at different locations. Only two support points are required. The invention is not limited to any one of these geometries, and one skilled in the art would know how to place support and pressure points according to the shape and the material of thefirst substrate 1 a. - The geometry of support and pressure points may, for example, respect two conditions:
-
- (1) at least two support points S1 and S2 have to be unaligned with at least one pressure point P1. In other words, the convex hull formed by the set of support and pressure points (i.e., the smallest polygon containing at least every point of this set) has to have a non-null surface area. However, there are no physical support means that are totally punctual: for example, a sucker or
suction cup 3 enlarges upon several cm2. Thus, if the suckers orsuction cups 3 are large enough, geometries as represented byFIGS. 5 d and 5 e do not contradict this first condition and can be used in embodiment of the method according to the invention, as one sucker orsuction cup 3 acts as a plurality of sufficiently distant support points. - (2) if there are at least three pressure points, they shall not form a triangle, In other words, the convex hull formed by the set of pressure points has to have a null surface area. If a triangle is formed, when contact between
surfaces
- (1) at least two support points S1 and S2 have to be unaligned with at least one pressure point P1. In other words, the convex hull formed by the set of support and pressure points (i.e., the smallest polygon containing at least every point of this set) has to have a non-null surface area. However, there are no physical support means that are totally punctual: for example, a sucker or
- The
first substrate 1 a is then bent by applying the strain F between the at least one pressure point P1 and the support points S1, S2, for example, thanks to the movement of apiston rod 5 in contact with thefirst substrate 1 a at the pressure point P1. Besides, the contact between thepiston rod 5 and thefirst substrate 1 a may be linear and not punctual, according to the second condition explained above. In this case the strain F is applied between the support points (S1, S2) and a pressure line P. When the twosurfaces - The applied strain deforms the
first substrate 1 a such that a central portion of the first substrate portion initially contacts the second substrate surface. When the strain F is applied in a linear manner the central portion of thefirst substrate 1 a contacts thesecond substrate 1 b in a line of contact. - After the initial contact is made, the strain F can be progressively released to propagate a bonding wave, which bonds the
substrates substrates - A first considered possibility is to simply release the vacuum at one stroke and provoke a high-speed propagation of the bonding wave. It was found, however, that this propagation is faster at the edge of the substrate than elsewhere. Thus, lateral parts of the bonding wavefront might join, whereas the central part has not yet reached the edge of the substrate and this might cause the trapping of air bubbles.
- To prevent this risk, the solution proposed by the invention is to progressively, and not suddenly, release the strain F applied between the support and pressure points (S1, S2, P1 . . . ), in order to control at any time the propagation of the bonding wave. To this end, suckers or
suction cups 3 may be, for example, mounted on telescopic aims 4. - Advantageously, in a variant of the method according to the invention, the
first substrate 1 a is bonded to a plurality ofsecond substrates 1 b. Indeed, thefirst substrate 1 a is, for example, a glass sheet, while thesecond substrate 1 b is a silicon tile. Large sheets of glass can be easily manufactured, so that they can receive a plurality of silicon substrates, as the substrates have generally a width between 20 cm and 30 cm. However, the invention is not limited to the bonding of glass and silicon substrates. -
FIGS. 6 a-6 d schematically represent a bonding sequence of afirst substrate 1 a and a plurality ofsecond substrates 1 b according to a second advantageous embodiment of the invention. - Initially (
FIG. 6 a), thesecond substrates 1 b are pre-positioned on asupport 10 and maintained by an optional vacuum system of suckers orsuction cups 12. Thefirst substrate 1 a is then positioned and laid onspacers 11 located on each side of thesecond substrates 1 b (i.e., between two rows). Thesespacers 11 have a height exceeding the thickness of thesecond substrates 1 b, preferably by at least 200 μm. In the case of silicon tiles having a thickness of e.g., 775 μm, the height ofspacers 11 therefore reaches at least 975 μm. Thespacers 11 are support lines for thefirst substrate 1 a (there may however be a succession of dots instead). - During a second step (
FIG. 6 b), thepiston rod 5 applies the strain F. As already explained, thepiston rod 5 can get in a punctual contact at the center of each tile or get in a linear contact (FIGS. 7 a and 7 b). The strain applied bypiston rods 5 will then bend thefirst substrate 1 a in between thelinear spacers 11. The mechanical contact is then obtained for the one or several second substrate(s) 1 b positioned between thespacers 11 and thefirst substrate 1 a. The nine tiles shown onFIG. 7 a may, for example, be bonded all the nine simultaneously (using nine pistons, or using three linear contact rods, not shown), or, for example, row by row (using three pistons as shown inFIG. 7 a), or, for example, one by one (using one piston, not shown). - The sucker or
suction cup 12 is then released, so thesecond substrate 1 b becomes only held by the pressure point P1 where molecular bonding is made, Thepiston rod 5 is thus progressively shortened, thesecond substrate 1 b rising up from thesupport 10 as the bonding wavefront extends (FIG. 6 c). With a deformation of thefirst substrate 1 a corresponding to a displacement of its edges with respect to the pressure point P1 of at least 200 μm (due to the height of each spacer 11), it is possible to control the bonding wave speed so that the bonding wave velocity ideally in each point of the bonding interface does not exceed the minimum bonding wave velocity that is observed in the center area of the bonding interface during an uncontrolled bonding, to prevent the formation of bubbles. The invention enables the bonding wave speed velocity to be reduced in the center, as well as in the periphery of the bonding interface. - The bonding ends when the
piston rod 5 reaches again its start position. The bonding wave has propagated over the whole surface of thesecond substrate 1 b (FIG. 6 d) - The method can then be applied on the next
second substrate 1 b or line ofsecond substrates 1 b. Advantageously, thepiston rod 5 is mounted on amobile device 6. Thismobile device 6 is, for example, a 3-axis robot. It can move from one first line ofsubstrates 1 b to another and sequentially applies the strain F to them. - According to another advantageous embodiment of the invention, the whole
first substrate 1 a is deformed, and it is bound simultaneously to the plurality ofsecond substrates 1 b. In this case, as it can be seen inFIG. 8 a, the bonding sequence begins with a step of pre-positioning thesubstrates first substrate 1 a is held under vacuum by suckers orsuction cups 3 at the extremity oftelescopic arms 4 above a plurality ofsecond substrates 1 b, which lay on thesupport 10. Eachsecond substrate 1 b may be held by at least one sucker orsuction cup 12 embedded in thesupport 10. The center of thefirst surface 2 a ofsubstrate 1 a is kept at least 100 μm above fromsurfaces 2 b of thesecond substrates 1 b. - For defaulting this
substrate 1 a, a central element, for example, apiston rod 5, is in contact with thesubstrate 1 a at the pressure point P1. Suckers orsuction cups 3 andtelescopic arms 4 are movable in rotation so that thesubstrate 1 a can take a free form, imposed only by the support points S1 and S2 of contact between the substrate (1 a) and the suckers orsuction cups 3, and the pressure point P1 of contact with the head of thepiston rod 5. By lengthening thepiston rod 5, the strain F is applied and the pressure point P1 gets closer to thesubstrates 1 b, as represented byFIG. 8 b. - A contact force of less than 10 N (e.g., 2-10 N) is applied to begin the molecular bonding (
FIG. 8 c). The bonding propagation wave is then initiated by gradual release of the bending imposed on thefirst substrate 1 a. For this, the telescopic aims 4 are lengthened (FIG. 8 d). The speed of this release is limited so that a uniform bonding wavefront propagates between the twosubstrates - When the bonding wavefront reaches other
second substrates 1 b, as represented byFIG. 8 e, advantageously,auxiliary piston rods 5′ embedded in thestructure 10 initiate bonding waves on the othersecond substrates 1 b. The bonding sequence ends when the strains applied on the entirefirst substrate 1 a are released (FIG. 8 f). - In particular, it is important to distinguish between two cases depending on whether the number of rows of
second substrates 1 b is odd or even. When this number is even (as shown inFIG. 8 ), the first contact is made on the edge of the two central rows. If this number is odd, the first contact is in the middle of the central row. The bonding mechanism is the same for the lateral rows. - This embodiment of the method according to the invention enables a high-speed industrial process, as a plurality of silicon tiles can be bound at once. Moreover, as only a small number of handlings are required, such a method guarantees a very precise bonding, leading to high-quality products.
- Although the preceding description mentions suckers or suction cups, this is intended to include other vacuum members or devices that are able to provide suction for holding the substrates.
Claims (20)
1. A bonding system for bonding a first substrate to a second substrate, comprising:
at least two support elements located and configured to support a first substrate thereon such that the first substrate is unsupported between the at least two support elements;
a support device configured to support a second substrate in alignment with the first substrate when the first substrate is supported by the at least two support elements; and
at least one strain application device located and configured to contact and strain a first substrate supported by the at least two support elements at a location between the at least two support elements and deform a first substrate such that the first substrate bends toward and contacts the second substrate;
wherein the at least one strain application device is configured to progressively release the strain applied to a first substrate such that a bonding wave propagates between the first substrate and a second substrate supported on the support device response to the release of the strain applied to the first substrate.
2. The bonding system of claim 1 , wherein each support element of the at least two support elements comprises a sucker or a suction cup.
3. The bonding system of claim 1 , further comprising at least one telescopic arm attached to at least one support element of the at least two support elements.
4. The bonding system of claim 1 , wherein the at least two support elements comprise at least two spacers disposed on the support device and extending a height over the support device greater than a thickness of the second substrate.
5. The bonding system of claim 4 , wherein the at least two spacers disposed on the support device extend a height of at least 975 μm over the support device.
6. The bonding system of claim 1 , wherein the at least one strain application device comprises at least one piston rod.
7. The bonding system of claim 1 , wherein the at least one strain application device is mounted on a mobile device configured to move the at least one strain application device relative to the first substrate.
8. The bonding system of claim 7 , wherein the mobile device comprises a robot.
9. The bonding system of claim 1 , wherein the support device is configured to support a plurality of second substrates in alignment with the first substrate when the first substrate is supported by the at least two support elements.
10. The bonding system of claim 1 , wherein the strain application device is configured to contact the first substrate only at a point.
11. The bonding system of claim 1 , wherein the strain application device is configured to contact the first substrate along a line of contact.
12. The bonding system of claim 1 , wherein the support device includes a vacuum device configured to hold the second substrate against the support device by a vacuum generated by the vacuum device.
13. The bonding system of claim 12 , wherein the bonding system is configured to release the vacuum generated by the vacuum device, and to subsequently progressively release the strain applied to a first substrate held by the at least two support elements.
14. The bonding system of claim 1 , wherein the bonding system is configured to selectively control a rate at which the strain applied to a first substrate is released and the rate of propagation of the resulting bonding wave between the first substrate and a second substrate.
15. A method for bonding a first substrate having a first surface to a second substrate having a second surface, which comprises:
holding the first substrate by at least two support points;
positioning the first substrate and the second substrate so that the first surface and the second surface face each other;
deforming the first substrate by applying between at least one pressure point and the at least two support points a strain toward the second substrate;
bringing the deformed first surface and the second surface into contact; and progressively releasing the strain to facilitate bonding of the substrates.
16. The method of claim 15 , wherein the applied strain deforms the first substrate such that a central portion of the first substrate portion initially contacts the second substrate surface before the strain is released to propagate a bonding wave which bonds the substrates together.
17. The method of claim 16 , wherein the strain is applied in a linear manner so that the central portion of the first substrate contacts the second substrate in a line of contact before the strain is released to propagate a bonding wave which bonds the substrates together.
18. The method of claim 15 , wherein the first substrate is held by suckers or suction cups placed at the at least two support points.
19. The method of claim 18 , wherein each sucker or suction cup is linked to a telescopic arm.
21. The method of claim 15 , wherein the second substrate is placed on a support comprising at least two spacers located respectively on each side of the second substrate, with the spacers being thicker than the thickness of the second substrate, the first substrate being held by resting on the spacers, with the at least two support points being points of contact between the spacers and the first substrate.
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FR2965974B1 (en) | 2013-11-29 |
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JP2012084850A (en) | 2012-04-26 |
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FR2965974A1 (en) | 2012-04-13 |
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KR101410858B1 (en) | 2014-06-24 |
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