WO2006035879A1 - 熱処理装置及び基板の製造方法 - Google Patents
熱処理装置及び基板の製造方法 Download PDFInfo
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- WO2006035879A1 WO2006035879A1 PCT/JP2005/017967 JP2005017967W WO2006035879A1 WO 2006035879 A1 WO2006035879 A1 WO 2006035879A1 JP 2005017967 W JP2005017967 W JP 2005017967W WO 2006035879 A1 WO2006035879 A1 WO 2006035879A1
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- WIPO (PCT)
- Prior art keywords
- substrate
- support
- heat treatment
- plate
- contact
- Prior art date
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/70—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping
- H10P72/76—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using mechanical means, e.g. clamps or pinches
- H10P72/7604—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using mechanical means, e.g. clamps or pinches the wafers being placed on a susceptor, stage or support
- H10P72/7611—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using mechanical means, e.g. clamps or pinches the wafers being placed on a susceptor, stage or support characterised by edge profile or support profile
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
- H10P95/90—Thermal treatments, e.g. annealing or sintering
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P32/00—Diffusion of dopants within, into or out of wafers, substrates or parts of devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/04—Apparatus for manufacture or treatment
- H10P72/0431—Apparatus for thermal treatment
- H10P72/0434—Apparatus for thermal treatment mainly by convection
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/70—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping
- H10P72/76—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using mechanical means, e.g. clamps or pinches
- H10P72/7604—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using mechanical means, e.g. clamps or pinches the wafers being placed on a susceptor, stage or support
- H10P72/7621—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using mechanical means, e.g. clamps or pinches the wafers being placed on a susceptor, stage or support characterised by supporting two or more semiconductor substrates
Definitions
- the present invention relates to a heat treatment apparatus for heat treating a semiconductor wafer, a glass substrate or the like, and a substrate manufacturing method for manufacturing a semiconductor wafer, a glass substrate or the like.
- a support in a vertical heat treatment apparatus has a pair of upper and lower end plates, and, for example, three holding members provided between the two end plates and arranged vertically, and these three holding members.
- a plurality of holding grooves which are arranged at equal intervals in the longitudinal direction and are opened so as to face each other.
- the substrates are configured to be aligned and held in a horizontal and mutual center aligned state.
- the support has a main body portion and a support portion provided on the main body portion and in contact with the substrate, and the support portion has a thickness such that the surface area is smaller than the area of the substrate flat surface.
- the support portion also constitutes a plate member made of silicon that is thicker than the thickness of the substrate (hereinafter referred to as a plate structure support tool), thereby dispersing the total weight of the substrate, reducing tensile stress and self-weight stress, and slipping. Is suppressed.
- Patent Document 1 International Publication WO2004Z030073 Pamphlet
- the processing substrate is made to be a plate-like member when automatic transfer is performed by an apparatus robot (substrate transfer machine). As soon as it is placed on the substrate, the substrate will slide and the specified position (automatically remove the substrate). If you deviate from the force, the problem occurred.
- Figure 14 shows the experimental results. According to Fig. 14, it can be seen that as the pitch ratio decreases, the occurrence of slippage deteriorates.
- the temperature distribution in the surface of the processed wafer is as follows.
- the in-plane deviation is small when the heat capacity of the plate is small, but the in-plane deviation is large when the heat capacity of the plate is large.
- This local temperature difference in the processing wafer surface causes local thermal stress to be applied in the surface, and as a result, slip easily occurs.
- the heat capacity is the amount of heat required to raise the temperature of an object by a unit temperature.
- the heat capacity is given by the product of specific heat CiZK'g) and mass (g), so the unit of heat capacity in this case is (JZK).
- the present invention solves the above-described problems, reliably prevents slippage that occurs when a substrate is supported on a support portion made of a plate-like member, and realizes slip-free by the low heat capacity of the support portion.
- an object of the present invention is to provide a heat treatment apparatus and a substrate manufacturing method capable of improving throughput.
- the first feature of the present invention is a heat treatment apparatus having a reaction vessel for processing a substrate and a support for supporting the substrate in the reaction vessel, the support being in contact with the substrate. And a main body portion that supports the support portion.
- the support portion is a plate-like member force that supports the substrate so that it does not come into contact with the peripheral portion of the substrate.
- At least one non-contact portion that communicates with the outside without contacting the substrate is provided in the mounting surface, and the area of the non-contact portion is surrounded by the outer edge line of the substrate mounting surface of the plate-like member
- the heat treatment equipment is 25% to 94%.
- the non-contact portion is provided at least in a central portion of the substrate mounting surface.
- the apparatus further includes a substrate transfer machine for transferring the substrate to the support, and the substrate transfer machine is configured to support a peripheral portion of the substrate.
- the plate member has a heat capacity of 61 JZK or more and 103 JZK or less.
- the area of the non-contact portion is 50% or more and 83% or less of the area of the region surrounded by the outer edge line of the substrate mounting surface of the plate-like member.
- the support portion has a disc shape, and the diameter thereof is not less than 63% and not more than 70% of the diameter of the substrate.
- the support portion has a disc shape, a diameter of 190 to 210 mm, and a substrate diameter of 300 mm.
- the support is configured to support a plurality of substrates in a plurality of stages at intervals in a substantially horizontal posture.
- the main body portion has an SiC force, and the support portion has an Si or SiC force.
- a layer having Si 2 O 3, SiC or Si N force is formed on the surface of the support portion.
- a second feature of the present invention is a heat treatment apparatus having a reaction vessel for processing a substrate and a support for supporting the substrate in the reaction vessel, the support being in contact with the substrate.
- a supporting part and a body part for supporting the supporting part, and the supporting part is a plate-like member force for supporting the substrate so as not to contact the peripheral edge of the substrate, and the substrate mounting surface of the plate-like member
- the heat treatment apparatus at least one non-contact portion communicating with the outside without contacting the substrate is provided, and the heat capacity of the plate member is 61 JZK or more and 103 JZK or less.
- a third feature of the present invention is a plate-like member that supports the substrate so that it does not come into contact with the peripheral portion of the substrate, and is in contact with the substrate within the substrate mounting surface of the plate-like member.
- At least one non-contact portion that communicates with the outside without being provided, and the area of this non-contact portion is 25% or more and 94% or less of the area surrounded by the outer edge line of the substrate mounting surface of the plate-like member.
- a fourth feature of the present invention is a plate-like member that supports the substrate so that it does not come into contact with the peripheral portion of the substrate, and is in contact with the substrate within the substrate mounting surface of the plate-like member. And a step of supporting the substrate by a support portion provided with at least one non-contact portion communicating with the outside and having a heat capacity of 61 JZK or more and 103 J ZK or less, and a substrate supported by the support portion in the reaction vessel.
- the substrate manufacturing method includes a step of performing a heat treatment, and a step of carrying out the substrate after the heat treatment supported by the support portion from the reaction vessel.
- a fifth feature of the present invention is a heat treatment apparatus including a reaction furnace that processes a substrate and a support that supports the substrate in the reaction furnace, wherein the support includes the substrate. And a main body portion that supports the support portion.
- the support portion is a plate-like member force that supports the substrate so as not to contact the peripheral portion of the substrate.
- the substrate mounting surface of the member is provided with at least one non-contact portion communicating with the outside without contacting the substrate, and the total opening area of the portion communicating with the outside of the non-contact portion is the total area of the substrate mounting surface.
- the heat treatment equipment is 25% to 94%.
- the non-contact portion is also configured with at least one force of a through hole and a groove.
- the non-contact portion is provided at least in the central portion of the substrate placement surface. More preferably, it is provided concentrically with the substrate at the center of the substrate mounting surface. A plurality of non-contact portions may be provided as long as at least one non-contact portion is provided. If only one is provided, it should be provided at the center of the substrate placement surface.
- the support part has a total area of the substrate mounting surface of the support part of 10% or more and 70% or less of the substrate flat surface.
- the support portion is disk-shaped and has a diameter of 1Z3 or more and 5Z6 or less of the substrate outer diameter.
- the support part is disk-shaped and has a diameter of 100 mm or more and 250 mm or less.
- the support is configured to support a plurality of substrates in a plurality of stages with a gap in a substantially horizontal state.
- the heat treatment apparatus further includes a substrate transfer machine for transferring a substrate to the support, and the substrate transfer machine is configured to support a peripheral portion of the substrate. More preferably, the substrate transfer machine has a U-shaped twister for supporting a peripheral portion of the substrate.
- the substrate transfer device is configured to place the substrate on the support portion by inserting and lowering the substrate above the support portion while supporting the peripheral portion of the substrate.
- a sixth feature of the present invention is a plate-like member force that supports the substrate so as not to contact the peripheral portion of the substrate, and the substrate mounting surface of the plate-like member contacts the substrate. Without a non-contact portion that communicates with the outside, and a support portion whose total opening area of the non-contact portion communicating with the outside is 25% to 94% of the total area of the substrate mounting surface.
- a step of supporting the substrate a step of carrying the substrate supported by the support portion into the reaction furnace, a step of heat-treating the substrate supported by the support portion in the reaction furnace, and the support portion supporting the substrate. And a step of unloading the substrate after the heat treatment from the reaction furnace.
- a seventh feature of the present invention is a heat treatment apparatus having a reaction furnace for processing a substrate and a support tool for supporting the substrate in the reaction furnace, wherein the support tool is the substrate. And a main body portion that supports the support portion, and the support portion is a plate-like member force that supports the substrate so as not to contact the peripheral portion of the substrate.
- the heat capacity of the member is in the heat treatment equipment set to 61JZK or more and 103JZK or less.
- An eighth feature of the present invention is that the substrate is supported so as not to contact the peripheral edge of the substrate.
- a plate-like member force to be held, and a step of supporting the substrate by a support portion in which the heat capacity of the plate-like member is set to 61 JZK or more and 103 JZK or less, and the substrate supported by the support portion in the reaction furnace.
- the heat capacity of the plate member is set to 66 JZK or more and 91 JZK or less.
- the heat capacity of the plate member is set to 70 JZK or more and 8 JZK or less.
- a non-contact portion that does not contact the substrate is provided inside the outer peripheral edge of the substrate mounting surface of the plate-like member.
- the non-contact portion is provided concentrically with the substrate.
- the non-contact portion is formed of a through hole or a saddle.
- the area of the non-contact portion is set to 50% or more and 83% or less of the entire area of the substrate mounting surface of the plate-like member.
- the area of the non-contact portion is set to 55% or more and 81% or less of the entire area of the substrate mounting surface of the plate-like member.
- the area of the non-contact portion is set to 58% or more and 78% or less of the total area of the substrate mounting surface of the plate-like member. Is set to 64% or more and 75% or less of the entire area of the substrate mounting surface of the plate-like member.
- the diameter of the plate-like member is set to be not less than 63% and not more than 70% of the diameter of the substrate.
- the diameter of the substrate is S300 mm, and the diameter of the plate member is 190 to 210 mm.
- a surface roughness Ra of at least a portion of the plate-like member that contacts the substrate is set to 1 ⁇ m to 100 O / zm.
- the support is configured to support a plurality of substrates in a plurality of stages with a substantially horizontal posture and a gap.
- the main body portion is made of silicon carbide and the support portion is made of silicon or silicon carbide.
- a layer made of silicon oxide, silicon carbide, or silicon nitride is formed on the surface of the support portion.
- the heat treatment is a treatment performed at a temperature of 1300 ° C or higher.
- the substrate mounting surface of the plate-like member that supports the substrate communicates with the outside without contacting the substrate so as not to contact the peripheral portion of the substrate.
- At least one non-contact portion is provided, and the area of this non-contact portion is set to 25% or more and 94% or less of the area surrounded by the outer edge line of the substrate mounting surface of the plate member.
- the air existing between the substrate and the plate-like member can be removed via the non-contact portion when the substrate is placed on the plate-like member, and thereby the substrate is placed on the support portion made of the plate-like member. Can be reliably prevented.
- the substrate mounting surface of the plate-like member that supports the substrate communicates with the outside without contacting the substrate so as not to contact the peripheral portion of the substrate. Therefore, since the plate member has a heat capacity of 61 JZK or more and 103 JZK or less, the slip ratio can be kept within the practical range.
- FIG. 1 is a perspective view showing a heat treatment apparatus according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing the reaction furnace used in the first embodiment of the present invention.
- FIG. 3 shows a support used in the first embodiment of the present invention
- FIG. 3 (a) is a plan sectional view
- FIG. 3 (b) is a sectional view taken along line AA in FIG. 3 (a). .
- FIG. 4 shows a support and a twister used in the first embodiment of the present invention
- FIG. 4 (a) is a plan sectional view showing a state in which the twister and the substrate are inserted into the support
- 4 (b) is a cross-sectional view taken along the line BB of FIG. 4 (a)
- FIG. 4 (c) is a plan view showing the twister.
- FIG. 5 is a plan view showing various types of support portions used in experiments conducted by the present inventors.
- FIG. 6 is a plan view of a support portion for explaining the reason why the total area of through-hole openings is set to 94% or less of the total area of the substrate mounting surface.
- FIG. 7 shows a modification of the first embodiment of the present invention
- FIG. 7 (a) is a plan view and a side view of the first modification
- FIG. 7 (b) is a plan view of the second modification. It is a side view.
- FIG. 8 is an explanatory diagram comparing a peripheral non-supporting type and a peripheral supporting type of the first embodiment of the present invention.
- FIG. 9 is a diagram showing a first form of the support used in the heat treatment apparatus according to the second embodiment of the present invention, where (a) is a plan sectional view and (b) is a CC line sectional view. .
- FIG. 10 shows a second form of the support used in the heat treatment apparatus according to the second embodiment of the present invention.
- (a) is a plan cross-sectional view
- (b) is a cross-sectional view along the line D-D.
- FIG. 11 is a plan view showing a modification of the second embodiment of the support portion used in the heat treatment apparatus according to the second embodiment of the present invention.
- FIG. 12 A cross-sectional view showing a third form of the support used in the heat treatment apparatus according to the second embodiment of the present invention.
- FIG. 13 is a graph showing the heat capacity dependency of the ratio of occurrence of slip in the support portion.
- FIG. 14 is a diagram showing a slip occurrence state due to a difference in distance (pitch) between substrates.
- ⁇ 15 It is for explaining the operation when the wafer is supported at three points.
- (A) is a schematic plan view
- (b) is a graph showing the deformation of the wafer
- (c) is an in-plane of the wafer. It is a graph which shows the maximum principal stress in the typical position of.
- ⁇ 16 It is for explaining the operation when supporting the wafer at four points.
- (A) is a schematic plan view
- (b) is a graph showing the deformation of the wafer
- (c) is an in-plane of the wafer. It is a graph which shows the maximum principal stress in the typical position of.
- ⁇ 17 It is for explaining the operation when a wafer is supported by a plate-like member, (a) is a schematic plan view, (b) is a graph showing deformation of the wafer, and (c) is a wafer surface. It is a graph which shows the maximum principal stress in the typical position in the inside.
- FIG. 18 (a) is a front sectional view showing a wafer supporting method using a plate-like member having no through hole
- FIG. 18 (b) is a front sectional view showing a wafer supporting method for supporting the peripheral edge of the wafer with a ring.
- FIG. 19 is a graph showing the relationship between the heat capacity and mass of a plate-like member and the slip-free rate.
- FIG. 20 is a graph showing the relationship between the apparent contact area between a wafer and a plate-like member and the slip-free rate.
- FIG. 1 shows a heat treatment apparatus 10 according to the first embodiment of the present invention.
- This heat treatment apparatus 10 is a batch type vertical heat treatment apparatus and has a casing 12 in which a main part is arranged.
- a pod stage 14 is connected to the front side of the housing 12, and the pod 16 is conveyed to the pod stage 14. For example, 25 substrates are stored in the pod 16 and set on the pod stage 14 with a lid (not shown) closed.
- a pod transfer device 18 is arranged on the front side in the housing 12 at a position facing the pod stage 14. Further, a pod shelf 20, a pod opener 22, and a substrate number detector 24 are arranged in the vicinity of the pod transfer device 18. The pod shelf 20 is arranged above the pod oven 22, and the board number detector 24 is arranged adjacent to the pod oven 22. The pod transfer device 18 transfers the pod 16 between the pod stage 14, the pod shelf 20, and the pod opener 22. The pod opener 22 opens the lid of the pod 16, and the number of substrates in the pod 16 with the lid opened is detected by the substrate number detector 24.
- a substrate transfer machine 26, a notch aligner 28, and a substrate support (boat) 30 used as a support for indicating a substrate in a reaction vessel 43 described later are disposed in the housing 12.
- the substrate transfer machine 26 has, for example, an arm (twister) 32 that can take out five substrates. By moving this arm 32, the pod, notch aligner 28 and substrate placed at the position of the pod opener 22 are arranged. The substrate is transferred between the supports 30.
- Notchia Liner 28 Detects the notch or orientation flat formed on the substrate and aligns the notch or orientation flat on the substrate at a certain position.
- a reaction furnace 40 is disposed at the upper part on the back side in the housing 12.
- a substrate support 30 loaded with a plurality of substrates is carried into the reaction furnace 40 and heat treatment is performed.
- FIG. 2 shows an example of the reaction furnace 40.
- This reactor 40 has a reaction tube 42 made of silicon carbide (SiC).
- the reaction tube 42 has a cylindrical shape in which the upper end is closed and the lower end is opened, and the opened lower end is formed in a flange shape.
- a quartz adapter 44 is disposed below the reaction tube 42 so as to support the reaction tube 42.
- the adapter 44 has a cylindrical shape with an open upper end and a lower end, and the open upper end and the lower end are formed in a flange shape.
- the lower surface of the lower end flange of the reaction tube 42 is in contact with the upper surface of the upper end flange of the adapter 44.
- the reaction tube 43 and the adapter 44 form a reaction vessel 43 for processing the substrate.
- a heater 46 is disposed around the reaction tube 42 excluding the adapter 44 in the reaction vessel 43.
- the lower part of the reaction vessel 44 formed by the reaction tube 42 and the adapter 44 is opened to insert the substrate support 30.
- the open part (furnace round part) of the furnace round seal cap 48 is O-phosphorus. It is sealed by contacting the lower surface of the flange at the lower end of the adapter 44 with a grip.
- the furnace seal cap 48 supports the substrate support 30 and is provided so as to be able to move up and down together with the substrate support 30.
- the heat insulating member 50 is provided.
- the substrate support 30 supports a large number of, for example, 25-: LOO substrates 54 in a substantially horizontal state with a plurality of steps with gaps, and is loaded into the reaction tube 42.
- the reaction tube 42 is made of silicon carbide (SiC) to enable treatment at a high temperature of 1200 ° C or higher. If this SiC reaction tube 42 is extended to the furnace part, and the furnace part is sealed with a furnace seal cap via an O-ring, the seal part is sealed by the heat transferred through the SiC reaction tube.
- the O-ring which is the sealing material, may melt. If the seal part of the reaction tube 42 made of SiC is cooled so as not to melt the O-ring, the reaction tube 42 made of SiC is damaged due to a difference in thermal expansion due to a temperature difference.
- the reaction tube 42 made of SiC and the adapter 44 made of quartz is improved in surface accuracy, the reaction tube 42 made of SiC is located in the heating area of the heater 46, so that there is a difference in temperature. It does not occur and expands isotropically. Therefore, the flange portion at the lower end of the SiC reaction tube 42 can be kept flat and there is no gap between the adapter 44 and the SiC reaction tube 42 to the quartz adapter 44. Sealing can be ensured simply by placing it.
- the adapter 44 is provided with a gas supply port 56 and a gas exhaust port 59 integrally with the adapter 44.
- a gas introduction pipe 60 is connected to the gas supply port 56, and an exhaust pipe 62 is connected to the gas exhaust port 59.
- the thickness of the adapter 44 in the circumferential direction is thicker than the thickness of the reaction tube 42 in the same direction, and is thicker than the thickness of a nozzle 66 described later in the same direction.
- the inner wall of the adapter 44 is located on the inner side (projects) from the inner wall of the reaction tube 42, and the side wall (thick part) of the adapter 44 communicates with the gas supply port 56, so that the vertical force gas
- An introduction path 64 is provided, and a nozzle mounting hole is provided at an upper portion thereof so as to open upward.
- This nozzle mounting hole opens in the upper surface of the upper end flange side of the adapter 44 inside the reaction tube 42 and communicates with the gas supply port 56 and the gas introduction path 64.
- a nozzle 66 is inserted and fixed in this nozzle mounting hole.
- the nozzle 66 is connected to the upper surface of the portion of the adapter 44 that protrudes inward from the inner wall of the reaction tube 42 inside the reaction tube 42, and the nozzle 66 is supported on the upper surface of the adapter 44.
- the nozzle connection is not easily deformed by heat and is not easily damaged.
- the processing gas introduced from the gas introduction pipe 60 to the gas supply port 56 is supplied into the reaction pipe 42 via the gas introduction path 64 and the nozzle 66 provided on the side wall of the adapter 44.
- the nozzle 66 is configured to extend above the upper end of the substrate arrangement region along the inner wall of the reaction tube 42 (above the upper end of the substrate support 30).
- the operation of the heat treatment apparatus 10 configured as described above will be described.
- the pod 16 is transferred from the pod stage 14 to the pod shelf 20 by the pod transfer device 18 and stocked on the pod shelf 20.
- the pod 16 stocked on the pod shelf 20 is transferred to the pod opener 22 by the pod transfer device 18 and set.
- the lid of the pod 16 is opened by the pod opener 22, and the pod 16 is detected by the substrate number detector 24. Detect the number of contained boards.
- the substrate is transferred from the pod 16 at the position of the pod opener 22 by the substrate transfer machine 26 and transferred to the notch aligner 28.
- the notch aligner 28 detects notches while rotating the substrate, and aligns the notches of the plurality of substrates at the same position based on the detected information.
- the substrate is transferred from the notch aligner 28 by the substrate transfer machine 26 and transferred to the substrate support 30.
- a plurality of substrates 54 are placed in the reaction furnace 40 (in the reaction vessel 43) set to a temperature of, for example, about 600 ° C. Is loaded, and the reactor 40 is sealed with a furnace seal cap 48.
- the temperature in the furnace is raised to the heat treatment temperature, and the reaction pipe 42 is passed through the gas introduction pipe 60 through the gas introduction port 56, the gas introduction path 64 provided in the adapter 44 side wall, and the nozzle 66.
- Introduce processing gas to Process gases include nitrogen (N), argon (Ar), hydrogen (H), oxygen (O
- the substrate 54 is heated to a temperature of about 1200 ° C. or higher, for example.
- the temperature in the furnace is lowered to a temperature of about 600 ° C, and then the substrate support 30 supporting the heat-treated substrate 54 is unloaded from the reaction furnace 40, and the substrate is The substrate support 30 is made to stand by at a predetermined position until all the substrates 54 supported by the support 30 are cooled.
- the substrate transfer device 26 takes out the substrate 54 from the substrate support 30 and the empty pod set in the pod opener 22. Transport to 16 and store.
- the pod 16 containing the substrate 54 is transferred to the pod shelf 20 or the pod stage 14 by the pod transfer device 18 to complete.
- FIG. 3 shows a schematic diagram of the support 30.
- Fig. 3 (a) is a cross-sectional plan view
- Fig. 3 (b) is a cross-sectional view along line AA in Fig. 3 (a).
- the support 30 includes a support portion 58 that comes into contact with the substrate 54, and a body portion 57 that supports the support portion 58 and a force.
- the main body 57 is made of, for example, silicon carbide (SiC) or silicon carbide impregnated with silicon, and includes a disk-shaped upper plate 61 (shown in FIG. 1) and a disk-shaped lower plate 63 (shown in FIG. 1). And three support columns 65, 65, 65 for connecting the upper plate 61 and the lower plate 63, and support pieces 67, 67, 67 extending from the support columns 65, 65, 65.
- the struts 65, 65, 65 are arranged 90 degrees apart from each other, and two are installed 180 degrees apart on the side where the twister 32 is inserted.
- the support pieces 67, 67, 67 ⁇ and the struts 65, 65, 65 also extend in the horizontal direction.
- the support pieces 67, 67, 67 are formed in a plurality of columns 65, 65, 65 at regular intervals in the vertical direction.
- Each of the support pieces 67, 67, 67 has a plate-like support.
- Part 58 is supported.
- the substrate 54 is supported so that the lower surface of the substrate 54 is in contact with the upper surface of the support portion 58. That is, the main body 57 is configured to support a plurality of support portions 58 in a horizontal posture in a multistage manner with intervals, and with this configuration, the plurality of substrates 54 are supported in a horizontal posture in a multistage manner with intervals. .
- the support 58 is made of silicon such as single crystal silicon (Si) or polycrystalline silicon (Poly-Si).
- the diameter of the support portion 58 is smaller than the diameter of the substrate 54. That is, the upper surface of the support portion 58 has an area smaller than the area of the flat surface that is the lower surface of the substrate 54, and the substrate 54 leaves the periphery of the substrate 54 (without contacting the substrate periphery). Supported by the support 58.
- the diameter of the substrate 54 is, for example, 300 mm. In this case, the diameter of the support portion 58 is less than 300 mm, and is preferably about 100 mm to 250 mm (about 1/3 to 5/6 of the diameter of the substrate). 210 mm (63% to 70% of the substrate diameter) is preferred! / ⁇ .
- the thickness of the support portion 58 is formed to be thicker than the thickness of the substrate 54.
- the thickness of the substrate 54 is, for example, 700 ⁇ m, and therefore the thickness of the support 58 exceeds 700 ⁇ m and can be up to 10 mm, at least twice the thickness of the substrate 54, For example, 3mm ⁇ 10 mm is preferred.
- the thickness of the support portion 58 is larger than the thickness of the support pieces 67, 67, 67.
- the material of the support portion 58 is made of silicon, which is the same material as the substrate 54, that is, a material having the same thermal expansion coefficient and hardness as the silicon substrate 54, the substrate 54 and the support portion 58 with respect to temperature change The difference between the thermal expansion and the thermal contraction of the substrate 54 can be eliminated, and even if a stress is generated at the contact point between the substrate 54 and the support 58, the stress can be easily released, so that the substrate 54 can be damaged. "Become. As a result, it is possible to prevent the occurrence of slip to the substrate 54 due to the difference in thermal expansion coefficient and the difference in hardness between the substrate 54 and the support portion 58.
- an adhesion preventing layer for preventing adhesion between the support portion 58 and the substrate 54 by heat treatment is formed on the upper surface (substrate mounting surface) of the support portion 58.
- This anti-adhesion layer is formed by, for example, treating a silicon surface or depositing on the silicon surface by CVD or the like to form a silicon nitride film (SiN), a silicon carbide film (SiC), an oxide layer, or the like. Silicon film (SiO 2)
- Glassy carbon, microcrystalline diamond, and the like which are composed of materials having excellent heat resistance and wear resistance.
- the non-contact part 70 communicating with the outside without contacting the substrate 54 is provided on the substrate mounting surface of the support portion 58.
- the non-contact part 70 is provided at least in the central part of the substrate mounting surface.
- the non-contact part 70 is constituted by a through hole 72.
- the through-hole 72 is provided at the center of the support portion 58 and is formed as a cylinder that is concentric with the substrate 54 and has a cross section of the concentric circle of the substrate 54.
- One end of the through-hole 72 opens to the substrate mounting surface of the support portion 58, and the other end opens to the lower surface of the support portion 58 to communicate with the outside.
- the opening area of the through-hole 72 communicating with the outside which corresponds to the area of the non-contact portion, is the area of the area surrounded by the outer edge line of the substrate placement surface of the plate-like member, which is the total area of the substrate placement surface. % To 94%.
- a plurality of through holes 72 can be provided without being limited to one.
- a plurality of through holes 72 can be provided around the central through hole 72.
- the through-hole 72 is not provided in the center of the substrate mounting surface.
- a plurality of other portions may be provided.
- the total opening area of the plurality of through holes 72 communicating with the outside is set to be 25% or more and 94% or less of the total area of the substrate mounting surface.
- the total opening area of the through holes 72 is the sum of the opening areas of the through holes 72.
- the total area of the substrate mounting surface is the total opening area of the through holes 72 and the through holes 72. Sum the area of the part that is not. The reason why the total opening area of the through hole 72 is defined in this way! This will be described later.
- FIG. 4 (a) is a plan sectional view showing a state in which the twister 32 and the substrate 54 are inserted into the support 30, and FIG. 4 (b) is a sectional view taken along the line BB in FIG. 4 (a).
- c) is a plan view showing the twister 32.
- the twister 32 is U-shaped, and two arm portions 74, 74 extend in parallel from the twister body 76. The inner end distance dl between the two arm portions 74, 74 is larger than the diameter d3 of the support portion 58 and smaller than the diameter d4 of the substrate 54.
- the outer end distance d2 of the two arm portions 74, 74 is equal to or slightly larger than the diameter d4 of the board 54 and smaller than the inner end distance d5 of the two struts 65, 65 on the twister insertion side. .
- the diameter d4 of the substrate 54 is smaller than the inner end distance d5 of the two struts 65, 65 on the twister insertion side, which is larger than the diameter d3 of the support portion 58.
- the thickness tl of the arm portions 74, 74 is smaller than the thickness t2 of the support portion 58.
- the peripheral portions of the substrate 54 can be supported by the arm portions 74, 74. That is, the substrate transfer machine is configured to support the peripheral portion of the substrate. In order to transfer the substrate 54 to the support 30 by the substrate transfer device, first, the peripheral portion of the substrate 54 is used. Are supported by the arm portions 74 and 74, and the arm portions 74 and 74 of the twister 32 are then inserted into the support 30 with the substrate 54 being supported.
- the substrate 54 and the arm portion 74, 74 can be inserted between the two struts 65, 65 on the twister insertion side.
- the upper and lower positions of the arm portions 74 and 74 are controlled by the substrate transfer machine so that the substrate 54 floats and is separated (separated) from the support portion 58, and the substrate 54 is the substrate of the support portion 58. It stops at a position a predetermined distance above the placement surface and at a concentric position of the support portion 58.
- Figure 4 (b) shows this condition.
- the state force that the substrate 54 floats with respect to the support portion 58 also lowers the twister 32 at a predetermined transfer speed.
- the transfer speed (twister descending speed) is 1 to 5 mmZsec, preferably 3 to 4 mmZsec.
- the inner end distance dl of the arm portions 74, 74 is larger than the diameter d3 of the support portion 58.
- the diameter d4 of the substrate 54 is larger than the diameter d3 of the support portion 58.
- the thickness tl of the arm portions 74, 74 is the support portion 58. Accordingly, when the twister 32 is lowered, the substrate 54 is placed on the substrate placement surface of the support portion 58.
- the air compressed between the back surface of the substrate 54 and the substrate mounting surface of the support portion 58 is compressed by lowering the substrate 54.
- the compressed air passes through the through-holes 72 to the outside (support portion). It is possible to prevent the substrate 54 from slipping onto the substrate mounting surface of the support portion 58.
- the transfer speed is set to 1 to 5 mmZse c, the air between the substrate 54 and the support 58 is sufficiently exhausted to prevent the substrate 54 from slipping. More than 25% of the total surface area is required.
- the substrate 54 is in contact with the support portion 58 and is stationary for about 5 seconds
- the substrate 5 The ability to eliminate 4 slips There is a requirement to minimize the transfer time of the substrate 54 during production, and when transferring more than 2 (for example, 5) simultaneously, the multiple substrates This is not practical in the sense that it is necessary to finely adjust the spacing and angle between the twisters 32 to bring 54 into contact with the support 58 at the same time. Therefore, it is preferable to form the through-hole 72 as in the above-described embodiment from the viewpoint of productivity, difficulty in fine adjustment of each twister in simultaneous transfer of a plurality of sheets, and processing accuracy of the twister.
- the arm portions 74, 74 are arranged so as to stop at a position between the substrate 54 and the support pieces 67, 67.
- the vertical position is controlled by the substrate transfer machine, and the twister 32 is moved (pulled out) in the horizontal direction of this stop position force to complete the transfer of one or more substrates 54. Then, by repeating such an operation one after another, a large number of substrates 54 are transferred to the support 30.
- the reason why the lower limit is set to 25% is as follows.
- the present inventor has various types as shown in FIGS. 5 (a) to 5 (d) with respect to the support part under the condition that the diameter of the support part (plate member) is fixed to 200 mm and the thickness is 6 mm to 7 mm.
- a 12-inch silicon wafer silicon wafer with a diameter of 300 mm
- the substrate slips.
- the results are shown in Table 1.
- the porous in Table 1 is a type in which a large number of through-holes 72 are regularly formed in the support portion 58, as shown in FIG. 5 (a).
- the four holes in Table 1 are a type in which a total of four through holes 72 are formed so that the center of the through hole 72 is located on the concentric circle of the support portion 58, as shown in FIG. 5 (b).
- the three holes in Table 1 are a type in which a total of three through holes 72 are formed so that the center of the through hole 72 is located on the concentric circle of the support portion 58, as shown in FIG. 5 (c).
- One hole (ring) in Table 1 is a type in which one hole is formed in the center of the support portion 58 as shown in FIG. 5 (d).
- the transfer speed was 3-4 mmZsec.
- Table 1 Relationship between the ratio of through-holes and the presence or absence of slipping ⁇ : No slipping ⁇ : Almost no slipping (In some cases, slipping) X: With slipping
- the substrate can be prevented from slipping, but the width of the portion of the support that comes into contact with the substrate becomes very narrow, and machining processing is performed.
- the through-hole is formed by this, the part is damaged, and the processing becomes difficult.
- the processing limit of the width of the part in contact with the substrate is about 5 mm as shown in FIG. It is 90% of the total area of the mounting surface), and if it is smaller than that, it may be damaged during processing.
- the force will increase to 94%. Due to temperature changes during loading, unloading, substrate temperature rise, temperature drop, heat treatment, etc., the support portion 58 is deformed, causing slip.
- the support part 58 has a disc shape as in the present embodiment, the strength limit during thermal variation of the width of the part in contact with the substrate is about 3 mm as shown in FIG.
- the total area of the hole openings is 94% of the total area of the substrate mounting surface), and if it is smaller than that, there is a risk of deformation during thermal fluctuations.
- the total area of the through-hole openings needs to be 90% or less of the total area of the substrate mounting surface, and considering the strength limit of the support 58 during temperature fluctuations, The total area of the hole openings must be 94% or less of the total area of the substrate mounting surface.
- the total area of the through holes is set to be equal to that of the substrate placement surface.
- the total area should be at least 25% and 94%. If the total area of the through-hole openings is within such a range, sticking between the substrate and the support portion due to heat treatment can be prevented. If the total area of the through holes is 65% or less of the total area of the substrate mounting surface, The rigidity of 58 can be further increased, and the support 58 itself is hardly deformed, which is preferable.
- FIG. 7 (a) shows a plan view and a side view of the support portion 58 in the first modification.
- the non-contact portion 70 that is a portion that does not contact the substrate is configured as the groove 82.
- the grooves 82 are formed on the substrate mounting surface of the support portion 58, and are composed of intersecting radial and concentric circles. One end of the radial groove 82 opens to the side surface of the support portion 58, and communicates with the outside through the side surface of the support portion 58.
- the total area where the grooves 82 open to the substrate placement surface may be 25% or more and 94% or less of the total area of the substrate placement surface.
- FIG. 7 (b) shows a plan view and a side view of the support portion 58 in the second modification.
- the non-contact portion 70 is configured by combining a through hole 72 and a groove 82. That is, the groove 82 is formed around the through hole 72 formed in the center of the support portion 58 and is formed in a plurality of concentric circles on the substrate mounting surface. Are formed at predetermined intervals. One end of the through hole 72 opens into the groove 82 and the other end opens at the lower surface of the support portion 58 to communicate with the outside.
- the total area where the grooves 82 open to the substrate mounting surface is set to 25% to 94% of the total area of the substrate mounting surface.
- the support portion in this embodiment is a type that supports the central portion of the substrate and does not contact the peripheral portion of the substrate (hereinafter referred to as a peripheral non-supporting type).
- a peripheral non-supporting type The difference between the case where the substrate is transferred to the peripheral non-support type support portion and the case where the substrate is transferred to the peripheral support type support portion in the present embodiment is described below with reference to FIG. explain. Fig.
- FIG. 8 (a) shows a state in which the substrate is supported by the twister
- Fig. 8 (b) shows a state in which the substrate is brought into contact with the support portion by lowering the twister
- Fig. 8 (c) The state where the twister is further lowered and the substrate is supported by the support portion is shown.
- the board warpage Is exaggerated for ease of understanding.
- the peripheral portion of the substrate 54 is supported by the twister 32 when the substrate is transported.
- the central part of the substrate lies below the peripheral part.
- the center part of the substrate is supported by the twister, so that the peripheral part of the substrate squeezes below the center part due to the weight of the substrate.
- the center of the substrate first comes into contact with the center of the supporting portion, and gradually as the twister 32 is lowered. Then, it comes into contact with the outside of the central portion, and the peripheral portion of the substrate is supported by the twister 32 and the central portion of the substrate is supported by the support portion 58. The way of gripping the substrate 54 is reversed from that at the time of conveyance as the twister 32 is lowered.
- the substrate edge part first comes into contact with the peripheral part of the support part and gradually comes into contact with the inner side as the twister descends, and the twister supports the central part of the board. The peripheral portion of the substrate is supported by the portion. The way to squeeze the substrate reverses with that during conveyance as the twister 32 is lowered.
- the support portion 58 supports the central portion of the substrate 54 when supporting the substrate, and is not in contact with the peripheral portion of the substrate 54. Therefore, due to the weight of the substrate, the peripheral edge of the substrate squeezes below the central portion of the substrate.
- the support portion of the peripheral support type supports the peripheral portion of the substrate and is not in contact with the central portion of the substrate. Therefore, the central portion of the substrate is lower than the peripheral portion of the substrate due to the weight of the substrate. I mourn.
- the amount of sliding force with respect to the support portion of the substrate when the through hole is not formed is 5 mn!
- the support part of the peripheral support type it is 3mn! ⁇ About 5mm. Therefore,
- the degree of slipping with respect to the support portion of the substrate is relatively large, whereas in the support portion of the peripheral support type, it is relatively small.
- the non-peripheral support type support part and the peripheral support type support part in the first embodiment of the present invention are (a) substrate transport, (b) substrate mounting, (C) How to support the substrate when supporting the substrate (support location) and how to squeeze the substrate are different, and (b) how to contact the substrate support when mounting the substrate is also different. From these facts, (b) how air escapes between the back surface of the substrate and the top surface of the support (substrate mounting surface) when the substrate is placed, and the air compressed by the substrate placement pushes the substrate. The force is also different, and the amount of sliding (sliding degree) of the substrate is also different.
- the sliding method of the substrate on the support portion differs between the support portion of the peripheral non-support type and the support portion of the peripheral support type as in the first embodiment of the present invention. Therefore, the critical value of the total area of the through-hole opening that does not cause slippage is also different.
- the total area of the through-hole openings is set to the total area of the substrate mounting surface in order to prevent slippage. While it is necessary to make the area at least 25% or more of the area, in the support part of the peripheral support type, if the total area of the through-hole openings is about 0.5% of the total area of the substrate mounting surface, the slip will not occur. It is thought that it will not occur.
- the total area of the through-hole openings that prevent the substrate from sliding which is peculiar to the case where the substrate is placed on a support portion of a type that does not contact the peripheral portion of the substrate.
- the critical value of is found.
- the overall configuration of the heat treatment apparatus 10 and the reaction furnace 40 in the second embodiment is the same as that of the heat treatment apparatus 10 and the reaction furnace 40 in the first embodiment described above with reference to Figs. It is the same.
- the overall configuration of the support tool 30 in the second embodiment is the same as that of the support tool 30 in the first embodiment except for the size of the saddle 58a provided in the support portion 58 and the size of the through hole 58b.
- a description will be given mainly of parts different from the first embodiment.
- the support 58 is provided with at least one spot facing 58a or a through hole 58b in order to reduce the heat capacity of the support 58 itself.
- a first form of the support 58 provided in the heat treatment apparatus 10 according to the second embodiment will be described with reference to FIG.
- 9 (a) and 9 (b) are a plan sectional view of a part of the support 30 in the first embodiment and a sectional view taken along the line C C.
- a saddle (concave portion) 58a is provided concentrically with the support portion 58 on the inner side of the support pieces 67, 67, 67 on the back surface (lower surface) of the support portion 58. ing. That is, the inner diameter of the saddle 58a is set to be equal to or smaller than the diameter of the circle formed by the tips of the three support pieces 67, 67, 67.
- the depth of the saddle 58a is set to about half of the thickness of the support portion 58.
- the saddle 58a is preferably provided in a range that does not reach the contact surface of the support portion 58 with the substrate 54.
- One saddle 58a may be provided concentrically with the support portion 58 as in this example, or a plurality thereof may be provided.
- the support 58 with the saddle 58a, it is possible to realize a reduction in the heat capacity of the support 58 itself, and the distance between the substrates is relatively small! (The pitch is narrow). In addition, it is possible to suppress slip and to realize a situation in which slip does not occur even when the temperature fluctuation rate is increased.
- the number of substrates processed at a time can be increased while realizing slip-free.
- the processing time can be shortened and the throughput can be improved.
- FIGS. 10A and 10B are a plan sectional view of a part of the support 30 in the second embodiment and a sectional view taken along the line D-D.
- FIGS. 11 (a), (b), and (c) are plan views of modifications of the support portion 58 in the second embodiment.
- at least one through hole 58 b is provided concentrically with the support portion 58 in a portion of the support portion 58 that is inside the front end portions of the support pieces 67, 67, 67.
- One through hole 58b may be provided concentrically with the support 58 as shown in FIG.
- a plurality of them may be provided as shown in FIGS.
- FIGS. 11 (a), (b), and (c) show an example in which three through holes 58b are provided, an example in which four through holes 58b are provided, and an example in which nine are provided.
- the through hole 58b which is a non-contact portion that does not contact the substrate 54, should be disposed inside the support portion 58 excluding 2 to 5 mm or more. . That is, if the through hole 58b is arranged inside the circle indicated by the imaginary line in FIG. 11 (c), the processing to the support portion 58 becomes easy. As described in the first embodiment, in consideration of the strength limit of the support portion when the temperature fluctuates, it is necessary to arrange the through hole 58b on the inner side excluding 3 mm or more from the outer periphery of the support portion 58.
- the number of substrates processed at a time can be increased while realizing slip-free.
- the processing time can be shortened and the throughput can be improved.
- FIGS. 12 (a) to 12 (b), (c), (d), and (e) are cross-sectional views of modifications of the support portion 58 in the third mode.
- FIGS. 12 (a) to 12 (e) are examples in which the through hole 58b and the saddle 58a are used in combination.
- FIG. 12 (a) shows an example in which a through hole 58b is provided concentrically with the substrate in the central portion of the support portion 58, and a saddle 58a is provided in a portion other than the peripheral portion on the back surface of the support portion 58.
- FIG. 12 (b) shows an example in which a through hole 58b is provided concentrically with the substrate in the central portion of the support portion 58, and a saddle 58a is provided on the outer peripheral portion of the back surface of the support portion 58.
- FIG. 12 (c) shows an example in which a through hole 58b is provided concentrically with the substrate in the central portion of the support portion 58, and a saddle 58a is provided in both the outer peripheral portion and the central portion of the back surface of the support portion 58.
- FIG. 12 (d) shows an example in which a through hole 58 b is provided concentrically with the substrate at the center of the support portion 58 and a saddle 58 a is provided on the side surface of the support portion 58.
- FIG. 12 (e) shows an example in which a through hole 58b is provided concentrically with the substrate in the central portion of the support portion 58, and a saddle 58a is provided in a portion other than the outer peripheral portion of the upper surface of the support portion 58.
- the support portion 58 Even when the support portion 58 is provided with the through hole 58b and the saddle 58a, the support portion 58 itself can be reduced in heat capacity, and the distance between the substrates is relatively small! Even if the pitch is narrow, slip can be suppressed, and even when the temperature fluctuation rate is increased, a situation can be realized in which slip does not occur.
- the number of substrates processed at a time can be increased while realizing slip-free.
- the processing time can be shortened and the throughput can be improved.
- FIG. 13 shows the result of slip occurrence rate evaluation when the base plate 54 is supported by the support portion 58 created by adopting the methods of the first and second embodiments described above. Since the heat treatment sequence was studied with various types, it is shown as a ratio.
- Wafer support method that minimizes friction and adhesion at the contact point.
- Conventional wafer support methods include, for example, a method of supporting the wafer shown in FIG. 15 (a) at three points (hereinafter referred to as three-point support), and a method of supporting the wafer shown in FIG. A method of supporting at a point (hereinafter referred to as four-point support), a method of supporting the wafer shown in FIG. 17 (a) with a ring member (hereinafter referred to as a ring) (hereinafter referred to as ring support), etc. Is mentioned.
- the maximum stress at the center of the wafer is minimal when the radius of the support point, that is, the radius R of the ring outer diameter (see Fig. 17 (a)) is about 95 to 105 mm. Can be confirmed.
- this is the support method with the least deformation of the wafer support method using a ring having an outer diameter of about 190 to 210 mm.
- the plate-shaped member without through-holes with an outer diameter of about 190-210mm shown in Fig. 18 (a) (hereinafter referred to as plate)
- the wafer support method using 58A is also based on a ring with an outer diameter of about 190-210mm. Similar to the wafer support method, it can be said that it is the support method with the least deformation of the wafer.
- the peripheral portion of the wafer 54 is supported by the ring 58B as shown in FIG. 18 (b). There is a wafer support method.
- the outer diameter of the ring 58B in this wafer support method is larger than the outer diameter of the wafer 54, and the inner diameter of the ring 58B (the diameter of the through hole) is smaller than the outer diameter of the wafer 54! /.
- the present invention is based on a plate-like member having an outer diameter smaller than the wafer outer diameter, in particular, a plate-like member having an outer diameter of about 190 to 210 mm, particularly a predetermined slip described below on the premise of a wafer support method using a ring.
- the heat capacity that can achieve the free rate and the value of the area of the non-contact part are investigated.
- thermal stress cause of the occurrence of slip (3) due to the temperature is generated, which causes the occurrence of slip. This can be inferred from the phenomenon that slipping is likely to occur when the rate of temperature change (temperature increase rate) from the wafer loading temperature to the processing temperature is increased.
- the plate-like member (plate and ring) supporting the wafer when the temperature of the plate-like member (plate and ring) supporting the wafer is large, the plate-like member is difficult to cool down, and as a result, the wafer supported by the plate-like member. The c becomes closer to the contact position with the plate-like member, and the portion becomes difficult to cool.
- the heater is located outside the wafer, so when the temperature inside the furnace rises, the peripheral edge of the wafer becomes a high temperature region, and the temperature inside the furnace drops. When doing so, the center of the wafer becomes a high temperature region.
- the temperature difference in the wafer surface at the time of temperature increase / decrease can be reduced by the effect of the heat capacity of the ring. it can.
- a plate-like member such as a ring or plate having an outer diameter of about 190 to 210 mm
- the edge force of the wafer is easily reached to the peripheral edge of the plate-like member at the time of temperature rise. Since the plate-shaped member needs to be heated in the direction of the smaller radius (inside), the temperature difference at this part tends to increase.
- the present inventor has determined how much the heat capacity of the plate-like member should be reduced when the wafer is supported by the plate-like member inside the outer periphery of the wafer without contacting the outer periphery of the wafer. It was experimentally verified whether slip does not occur.
- a plate-like member with a thickness of 6 to 7 mm and an outer diameter of 200 mm (the outer edge of the contact portion has an outer diameter of 200 mm or less because it has an R chamfered portion on the surface side edge) is a through-hole.
- a sample was used in which the mass of the ring, that is, the heat capacity, was changed by changing the inner diameter of the ring (the diameter of the through hole).
- Samples, samples with a mass force of 31%, samples with a mass of 26%, and samples with a mass of 19% were used.
- the experimental conditions are as follows.
- the wafer diameter is 300mm
- the wafer pitch (distance between wafers) is 13-14mm
- the number of wafers to be processed at one time is 40-50
- the processing temperature is 1300 ° C or more 1300-1400. C.
- Each sample was installed in the experimental furnace at the same time, and each sample was installed in an area where the temperature in the furnace was uniform.
- the lower horizontal axis shows the ratio of the mass of the sample to the mass of the plate-shaped member (plate) without a through hole
- the upper horizontal axis shows the lower horizontal axis.
- Corresponding heat capacity is taken.
- the vertical axis represents the slip-free rate.
- the slip-free rate indicates the percentage obtained by dividing the number of wafers for which no slip was observed by the total number of processed wafers.
- the slip generated by the thermal stress due to the temperature difference in the wafer surface (the cause of slip generation (3)) has little effect if the heat capacity of the ring (plate member) is 100 JZK or less! / Judgment can be made.
- a slip-free rate of 50% or more can be obtained.
- the ring heat capacity is 63JZK or more and 96JZK or less (the ratio of the mass of the ring to the plate is 19% or more and 29% or less)
- a slip-free rate of 60% or more is obtained.
- the heat capacity of the ring is 70 JZK or more and 8 JZK or less (ratio of mass ratio to the ring plate is 21% or more and 26% or less), a slip-free rate of 80% or more is obtained.
- slip-free rate needs to be at least 50% practically, and if it is lower than that, it is not preferable for practical use.
- the same conditions as the above-mentioned experiment that is, the wafer diameter of 300 mm, the wafer pitch of 13 to 14 mm, and the number of wafers to be processed at one time 40 to 50
- the slip did not occur on the wafer and the slip-free rate was 0%.
- the apparent contact area differs from the true contact area.
- the true contact area is constant regardless of the apparent contact area if the load and the physical properties of the contact object are the same. For this reason, if the apparent contact area decreases, the amount of bite and bite increases at the microscopic protrusions of the wafer or the supporting part that supports the wafer.
- the inventor experimentally verified the relationship between the apparent contact area between the wafer and the plate-like member and the slip-free rate.
- a plate-like member with a thickness of 6 to 7 mm and an outer diameter of 200 mm (the outer edge of the contact portion has an outer diameter of 200 mm or less because it has an R chamfered portion on the surface side edge) is a through-hole.
- a sample was used in which the area of the non-contact portion with the wafer in the wafer mounting surface of the ring was changed by changing the inner diameter of the ring (the diameter of the through hole).
- a sample with a non-contact area of 25% with the area of the wafer mounting surface of a plate-like member (plate) having the same thickness and outer diameter and no through-hole as a reference (0%)
- a sample with an area of 35%, a sample with a non-contact part area of 50%, a sample with a non-contact part area of 65%, and a sample with a non-contact part area of 80% was used.
- the experimental conditions are as follows.
- the wafer diameter was 300 mm
- the wafer pitch (distance between wafers) was 13 to 14 mm
- the number of wafers processed at one time was 40 to 50
- the processing temperature was 1300 to 1400 ° C.
- Each sample was installed in the experimental furnace at the same time, and each sample was installed in an area where the temperature in the furnace was uniform.
- the horizontal axis shows the non-contact portion ratio (with respect to the area of the wafer mounting surface of the plate The ratio of the area of the non-contact portion with the wafer within the wafer mounting surface of the sample) is taken and is expressed as a percentage.
- the vertical axis represents the slip-free rate in each sample.
- non-contact portion ratio By setting the non-contact portion ratio to 55% or more and 80% or less, a slip-free rate of 60% or more can be achieved.
- the non-contact part ratio By setting the non-contact part ratio to 58% or more and 78% or less, a slip-free ratio of 70% or more can be achieved.
- the slip-free rate needs to be at least 50% practically, and if it is lower than that, it is not practically preferable.
- the range of the non-contact portion ratio for preventing the substrate from sliding in the first embodiment is 25% or more and 94% or less. That is, the range of the non-contact portion ratio for achieving the slip-free rate required for practical use is included in the range of the non-contact portion ratio for preventing the substrate from slipping. In other words, by setting the non-contact portion ratio to 50% or more and 83% or less, it is possible to prevent slippage of the substrate during automatic transfer to the support portion of the substrate as much as possible to achieve the practically required slip-free rate. It became clear that different problems could be solved simultaneously.
- the range where the frictional force (including the adhesion force) at the contact point between the wafer and the plate-shaped member shown on the vertical axis in Fig. 21 (b) is minimal is the contact shown in Fig. 21 (a). It depends on the radius R of the part sphere, and by reducing the included angle ⁇ shown in Fig. 21 (a), the range where the frictional force is minimized becomes wider. I'm stuck.
- the included angle ⁇ in FIG. 21 is reduced, and as a result, there is a high possibility that the surface roughness Ra of the plate-like member falls within the optimum range, that is, the range where the frictional force is minimized.
- the range in which the frictional force of the surface roughness Ra is minimized when the wafer is supported by the plate-like member in the present invention is 1 ⁇ m to 1000 ⁇ m.
- the slip-free rate decreases because the compressive stress (slip generation cause (2)) due to the wafer's own weight at the support point (contact point) becomes larger than the friction force. It is done.
- a force using a batch-type heat treatment apparatus that heat-processes a plurality of substrates is a single-wafer type that is not limited to this. Also good.
- the heat treatment apparatus of the present invention can be applied to a substrate manufacturing method.
- oxygen ions are implanted into the single crystal silicon wafer by an ion implantation apparatus or the like.
- the wafer into which oxygen ions are implanted is used at the high temperature of 1300 ° C. to 1400 ° C., for example, 1350 ° C. or higher, for example, in an Ar, O atmosphere using the heat treatment apparatus of the above embodiment.
- the SiO layer was formed inside the wafer (the SiO layer was embedded) A SIMOX wafer is produced.
- the heat treatment apparatus of the present invention can also be applied to one step of a method for manufacturing a hydrogen annealing wafer or an Ar annealing wafer.
- the wafer is annealed at a high temperature of about 1200 ° C. or higher in a hydrogen atmosphere or an Ar atmosphere using the heat treatment apparatus of the present invention.
- a high temperature of about 1200 ° C. or higher in a hydrogen atmosphere or an Ar atmosphere.
- the heat treatment apparatus of the present invention can be applied to one step of the manufacturing method of the epitaxial wafer.
- the substrate is supported on the support portion that also serves as the plate member by using the heat treatment apparatus of the present invention.
- the slip-free rate can be improved.
- the heat treatment apparatus of the present invention can also be applied to a manufacturing method of a semiconductor device (device).
- thermal oxidation processes such as wet oxidation, dry oxidation, hydrogen combustion oxidation (pyrogenic oxidation), HC1 oxidation, boron (B), phosphorus (P)
- dopants such as arsenic (As) and antimony (Sb) into the semiconductor thin film.
- the substrate is supported on the support portion having a plate-like member force.
- the slip-free rate can be improved.
- the present invention In the method for manufacturing a substrate in which heat treatment is performed with the substrate supported by a support, the present invention must reliably prevent slippage that occurs when the substrate is supported by the support portion having the plate-like member force. It can be used for what you need.
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- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006537808A JP4833074B2 (ja) | 2004-09-30 | 2005-09-29 | 熱処理装置、熱処理方法、基板の製造方法及び半導体装置の製造方法 |
| KR1020077006112A KR100875464B1 (ko) | 2004-09-30 | 2005-09-29 | 열처리 장치 및 기판의 제조방법 |
| US11/663,852 US7625205B2 (en) | 2004-09-30 | 2005-09-29 | Heat treatment apparatus and method of manufacturing substrates |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004287739 | 2004-09-30 | ||
| JP2004287120 | 2004-09-30 | ||
| JP2004-287739 | 2004-09-30 | ||
| JP2004-287120 | 2004-09-30 | ||
| JP2005-232275 | 2005-08-10 | ||
| JP2005232275 | 2005-08-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006035879A1 true WO2006035879A1 (ja) | 2006-04-06 |
Family
ID=36119024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2005/017967 Ceased WO2006035879A1 (ja) | 2004-09-30 | 2005-09-29 | 熱処理装置及び基板の製造方法 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7625205B2 (ja) |
| JP (1) | JP4833074B2 (ja) |
| KR (1) | KR100875464B1 (ja) |
| WO (1) | WO2006035879A1 (ja) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007134403A (ja) * | 2005-11-08 | 2007-05-31 | Tokyo Seimitsu Co Ltd | プローバ |
| JP2007305614A (ja) * | 2006-05-08 | 2007-11-22 | Tokyo Electron Ltd | 基板の反り測定装置及び基板処理システム |
| WO2009008124A1 (ja) * | 2007-07-11 | 2009-01-15 | Shin-Etsu Handotai Co., Ltd. | ウエーハ熱処理用治具およびこれを備えた縦型熱処理用ボート |
| JP2011527109A (ja) * | 2008-06-30 | 2011-10-20 | エムイーエムシー・エレクトロニック・マテリアルズ・インコーポレイテッド | 低熱容量半導体ウェハサポート |
| JP2014093522A (ja) * | 2012-11-06 | 2014-05-19 | Tera Semicon Corp | バッチ式基板処理装置 |
| JP2015135905A (ja) * | 2014-01-17 | 2015-07-27 | 東京エレクトロン株式会社 | 真空処理装置及び真空処理方法 |
| JP2017055104A (ja) * | 2015-09-11 | 2017-03-16 | ユ−ジーン テクノロジー カンパニー.リミテッド | 基板処理装置 |
| WO2020059093A1 (ja) * | 2018-09-20 | 2020-03-26 | 株式会社Kokusai Electric | 基板処理装置 |
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| US7891975B2 (en) * | 2004-08-06 | 2011-02-22 | Hitachi Kokusai Electric, Inc. | Heat treatment apparatus and method of manufacturing substrate |
| JP5295768B2 (ja) * | 2006-08-11 | 2013-09-18 | 株式会社日立国際電気 | 基板処理装置、基板処理方法及び半導体装置の製造方法 |
| JP5071217B2 (ja) * | 2008-04-17 | 2012-11-14 | 信越半導体株式会社 | 縦型熱処理用ボートおよびそれを用いたシリコンウエーハの熱処理方法 |
| US20100098519A1 (en) * | 2008-10-17 | 2010-04-22 | Memc Electronic Materials, Inc. | Support for a semiconductor wafer in a high temperature environment |
| KR20110007434A (ko) * | 2009-07-16 | 2011-01-24 | 주식회사 아이피에스 | 반도체 제조 장치 |
| JP2011129679A (ja) * | 2009-12-17 | 2011-06-30 | Hitachi Kokusai Electric Inc | 基板処理装置 |
| USD654882S1 (en) * | 2010-10-21 | 2012-02-28 | Tokyo Electron Limited | Gas-separating plate for reactor for manufacturing semiconductor |
| USD655261S1 (en) * | 2010-10-21 | 2012-03-06 | Tokyo Electron Limited | Gas-separating plate for reactor for manufacturing semiconductor |
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| US10167571B2 (en) | 2013-03-15 | 2019-01-01 | Veeco Instruments Inc. | Wafer carrier having provisions for improving heating uniformity in chemical vapor deposition systems |
| EP2784422B1 (en) * | 2013-03-28 | 2017-10-04 | Mitsubishi Materials Corporation | Holding plate for deposition and heat treatment and method of producing the same |
| DE102015112036B4 (de) * | 2015-07-23 | 2017-05-11 | Schott Ag | Monolithische Unterlage zur vollflächigen Unterstützung eines Werkstücks |
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- 2005-09-29 KR KR1020077006112A patent/KR100875464B1/ko not_active Expired - Fee Related
- 2005-09-29 JP JP2006537808A patent/JP4833074B2/ja not_active Expired - Fee Related
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| JP2007305614A (ja) * | 2006-05-08 | 2007-11-22 | Tokyo Electron Ltd | 基板の反り測定装置及び基板処理システム |
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| JP2014093522A (ja) * | 2012-11-06 | 2014-05-19 | Tera Semicon Corp | バッチ式基板処理装置 |
| JP2015135905A (ja) * | 2014-01-17 | 2015-07-27 | 東京エレクトロン株式会社 | 真空処理装置及び真空処理方法 |
| JP2017055104A (ja) * | 2015-09-11 | 2017-03-16 | ユ−ジーン テクノロジー カンパニー.リミテッド | 基板処理装置 |
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| WO2020059093A1 (ja) * | 2018-09-20 | 2020-03-26 | 株式会社Kokusai Electric | 基板処理装置 |
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Also Published As
| Publication number | Publication date |
|---|---|
| US7625205B2 (en) | 2009-12-01 |
| JP4833074B2 (ja) | 2011-12-07 |
| JPWO2006035879A1 (ja) | 2008-05-15 |
| KR20070083564A (ko) | 2007-08-24 |
| KR100875464B1 (ko) | 2008-12-22 |
| US20070292814A1 (en) | 2007-12-20 |
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