WO2012086012A1 - 基板熱処理装置 - Google Patents
基板熱処理装置 Download PDFInfo
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- WO2012086012A1 WO2012086012A1 PCT/JP2010/073019 JP2010073019W WO2012086012A1 WO 2012086012 A1 WO2012086012 A1 WO 2012086012A1 JP 2010073019 W JP2010073019 W JP 2010073019W WO 2012086012 A1 WO2012086012 A1 WO 2012086012A1
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- ring
- wafer
- support plate
- groove
- substrate
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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
- H01L21/67—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
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67115—Apparatus for thermal treatment mainly by radiation
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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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/324—Thermal treatment for modifying the properties of semiconductor bodies, e.g. annealing, sintering
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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
- H01L21/26—Bombardment with radiation
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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
- H01L21/67—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
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67103—Apparatus for thermal treatment mainly by conduction
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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
- H01L21/67—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
- H01L21/683—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 for supporting or gripping
- H01L21/687—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68721—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by edge clamping, e.g. clamping ring
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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
- H01L21/67—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
- H01L21/683—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 for supporting or gripping
- H01L21/687—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68742—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a lifting arrangement, e.g. lift pins
Definitions
- the present invention relates to a substrate heat treatment apparatus used in an electronic device manufacturing process or the like.
- Patent Document 1 proposes that a substrate is supported by a support pin integrated with a lifting device, and the substrate is heated close to a heating plate.
- a heating plate is disposed on the upper side of the vacuum device, and an elevating device having the support pins is provided on the lower side of the heating plate.
- a guard ring having a larger diameter than the wafer on the outer periphery.
- Patent Document 2 When the wafer is heated by the facing lamp, the wafer surface temperature is usually highest at the center of the wafer, and at the outer edge, heat escapes to the surroundings and the temperature is lowered.
- the outer ring When the outer ring is installed, the outer edge of the wafer is regarded as an integral part of the outer ring, and heat radiation can be reduced. This improves the uniformity of the wafer temperature.
- the guard ring is arranged at a predetermined position in the apparatus, the wafer to be processed is carried by the transfer mechanism, and after the wafer and the guard ring are determined to have a predetermined positional relationship, the lamp light is irradiated. The wafer is heated. The processed wafer is carried out in the same manner.
- the wafer is to be heat-treated at a plurality of positions according to various purposes (change the distance between the lamp and the wafer during irradiation), the positional relationship between the wafer and the outer ring at each position changes. End up. If the position of the outer ring is changed to avoid this, the mechanism becomes complicated. There is also a problem of reliability.
- the guard ring since the guard ring is used to obtain uniformity of the temperature of the wafer to be heated, it is desirable that the guard ring be made of the same material as the wafer. However, unlike the wafer, it is repeatedly used (heated), so that the thermal characteristics (specific heat) Often, another material is used that is close to the wafer and durable.
- the guard ring has the purpose of obtaining uniformity of the wafer temperature and preventing or reducing the temperature rise and damage of the parts by blocking the irradiation of the lamp light to the lower part of the chamber.
- the first problem is the problem of thermal expansion. Since the guard ring is directly irradiated with heat, it is heated to a high temperature exceeding 500 ° C., for example, in the same manner as the wafer.
- the guard ring is often made of a brittle material such as ceramics, and the lifting device that moves the guard ring up and down is made of a metal material such as stainless steel.
- the parts may be damaged due to excessive thermal stress or differences in expansion amount, resulting in damage to the guard ring, broken fastening parts (screws), fastening part parts ( Defects such as metal deformation occur. Even if the damage does not occur, the deformed parts may rub against each other to generate particles.
- the second problem is the problem of heat escape through the joint between the guard ring and the shaft of the lifting device.
- the wafer is heated to a high temperature.
- the guard ring blocks the irradiation of the lamp light to the lower part of the chamber and prevents or reduces the temperature rise of the parts. Therefore, a large temperature difference occurs between the upper side and the lower side of the guard ring. This temperature difference promotes heat transfer between the guard ring and the shaft. This means that heat escapes from the guard ring through the shaft. Thermal escape is a loss in the wafer heating process.
- the guard ring serves to make the wafer temperature uniform during the process. When heat escapes from the joint between the guard ring and the shaft, temperature non-uniformity occurs in the guard ring surface, and the temperature of the heated wafer becomes non-uniform.
- the present invention has been made in view of the above-described conventional problems.
- the object of the present invention is to reduce damage to structural members due to thermal expansion even at high temperatures and to uniformly heat a substrate at high speed.
- An object of the present invention is to provide a substrate heat treatment apparatus.
- one embodiment of the present invention is a substrate heat treatment apparatus that performs heat treatment on a substrate, and is configured to be able to hold a substrate support plate capable of supporting the substrate and the substrate support plate.
- the elevating mechanism has elevating means for elevating and lowering the substrate support plate between a first position close to the heating means and a second position separated from the heating means.
- the influence can be mitigated, and damage to the constituent members can be reduced.
- the substrate can be heated uniformly and rapidly.
- FIG. 1 It is a schematic diagram of the substrate heat processing apparatus which concerns on one Embodiment of this invention. It is an outer periphery ring which concerns on one Embodiment of this invention, and the structure figure (exploded view) of the lower part. It is an outer periphery ring which concerns on one Embodiment of this invention, and a structure figure of the lower part. It is a top view of the outer periphery ring which concerns on one Embodiment of this invention, Comprising: It is A arrow view of FIG.
- FIG. 1 is a structural diagram around a cooling stage of a substrate heating apparatus according to an embodiment of the present invention. It is the schematic of the substrate heat processing apparatus which concerns on one Embodiment of this invention. It is the schematic of the substrate heat processing apparatus which concerns on one Embodiment of this invention. It is a figure which shows the wafer removal
- FIG. 1 is a schematic diagram of a substrate heat treatment apparatus for performing heat treatment on a substrate according to the present embodiment.
- reference numeral 1 denotes a chamber
- reference numeral 2 denotes an exhaust port
- reference numeral 3 denotes a wafer W loading port.
- the chamber 1 is connected to the exhaust system through the exhaust port 2.
- the exhaust system is formed by appropriately selected vacuum pumps, valves, and gauges, and the inside of the chamber 1 can be evacuated to a desired pressure.
- the wafer W before processing is loaded from the wafer transfer system through the loading port 3 and the processed wafer W is unloaded.
- the top plate portion of the chamber 1 has a light incident window 10 made of a light transmitting material.
- a lamp 11 as a heating unit is provided on the upper side of the light incident window 10 (that is, on the upper side in the gravity direction of the wafer W placed on the outer peripheral ring 5 described later), and the light of the lamp 11 enters through the light incident window. Then, the wafer W is heated.
- the heating means is not limited to a lamp, and may be any configuration as long as it can release heat and heat a substrate provided separately by the heat, such as a heating plate.
- the outer peripheral ring 4, which is an annular member, is a substrate support plate for supporting the wafer W, and is arranged so that the lamp light from the lamp 11 enters, that is, faces the lamp 11.
- Wafer support pins 5 are provided on the outer ring 4.
- three wafer support pins 5 are used.
- the outer peripheral ring 4 is placed on the lifting mechanism 20 via a ball 12 as a connecting member. Since the sphere 12 as the connecting member is configured to be at least slidable with the outer ring 4, the outer ring 4 is not rigidly connected to the lifting mechanism 20.
- the elevating mechanism 20 includes a connection ring 6, a shaft 7, and an actuator 15.
- the connection ring 6 is a member (substrate support plate holding part) for holding the outer ring 4 and is moved up and down by being fastened to the shaft 7 and driving the actuator 15. That is, by driving the actuator 15, the elevating mechanism 20 moves up and down (moves up and down) the outer ring (that is, the wafer W placed on the outer ring) held on the connection ring 6 via the sphere 12.
- the wafer W can be stopped at a predetermined position such as a first position (for example, a heating position) close to the lamp 11 and a second position (for example, a transfer position) farther from the lamp 11 than the first position. Can be made.
- the actuator 15 is a servo motor, but may be other means such as an air cylinder. Further, in order to move the shaft 7 with high accuracy, linear motion guidance is also necessary.
- This embodiment is an apparatus that performs lamp heat treatment in a vacuum. Since the linear motion guide and actuator 15 are installed on the atmosphere side outside the chamber, the shaft 7 is vacuum-sealed using a bellows (not shown). In the present embodiment, the connection ring 6 is supported by the two shafts 7, but the number of shafts is not limited to this and may be one or three or more. It is not necessary for all shafts to be connected to and driven by an actuator, and some may be used as linear motion guides only.
- the lamp heating apparatus includes the outer peripheral ring 4.
- the outer peripheral ring 4 serves to support the wafer W as well as improve the uniformity of the wafer temperature and shield the lamp light from the lower part of the chamber.
- the wafer W is supported by wafer support pins 5 that are protruded from the outer peripheral ring 4.
- the outer peripheral ring 4 is moved up and down by an actuator 15 to change the position of the wafer W for heating and conveyance.
- FIG. 2 is a structural diagram (exploded view) of the outer peripheral ring 4 and its lower part according to the present embodiment.
- FIG. 3 is an exploded view of FIG. 2, which is an exploded view.
- the outer peripheral ring 4 is ring-shaped SiC (thermal conductivity: 270 W / m ⁇ K), and the insertion holes 5 a are formed at three locations.
- Wafer support pins 5 made of SiC (thermal conductivity: 270 W / m ⁇ K) are inserted into the insertion holes 5 a, and the wafer W can be supported by the three wafer support pins 5. If the wafer W is irradiated with lamp light (heating light) from the lamp 11 while the wafer W is placed on the wafer support pins 5, the outer ring 4 is also heated by the lamp light.
- the outer ring 4 since the outer ring 4 has a high thermal conductivity, the outer ring 4 becomes high in temperature by irradiation with the lamp light and radiates heat. Since the outer edge portion of the wafer W faces at least the outer peripheral ring 4, the heat radiated from the outer peripheral ring 4 can act on the outer edge portion of the wafer W. That is, the outer peripheral ring 4 heated by the lamp light radiates and heats the outer edge portion of the wafer W. Therefore, the temperature between the center portion and the outer edge portion of the wafer W can be reduced.
- the shape of the outer peripheral ring 4 is a ring shape (annular shape).
- the shape is not limited to this shape, and when the wafer W is supported via the wafer support pins, the outer peripheral ring 4 is formed on the outer edge portion of the wafer.
- the shape may be disk-shaped or polygonal, such as a quadrangle.
- the wafer W is supported by providing the wafer support pins 5 on the outer ring 4. Therefore, when the wafer W is supported by the substrate support plate, the contact area between the wafer W and the substrate support plate can be made a point.
- the inner peripheral edge of the guard ring is tapered along the circumferential direction, and the taper formed in the circumferential direction and the edge of the wafer are brought into line contact with each other to place the wafer on the guard ring.
- the wafer W since the wafer W is placed on the substrate support plate by point contact, the movement of heat due to heat conduction between the wafer W and the substrate support plate can be further reduced. .
- the outer peripheral ring 4 as the substrate support plate has the function of the conventional guard ring as well as the substrate support function. Accordingly, in the configuration in which both the substrate and the guard ring are moved up and down, the relative positional relationship between the substrate and the guard ring does not change.
- the wafer support pins 5 are provided at three locations.
- the wafer support pins 5 may be provided at any number of locations such as four locations and five locations as long as the wafer W can be stably supported. That is, since the wafer W can be stably supported if it is supported at three points by the wafer support pins, the wafer support pins 5 may be provided at least at three locations.
- connection ring 6 located below the outer ring 4 is somewhat smaller than the outer ring.
- the connection ring 6 is fastened to the shaft 7 and is driven up and down by an actuator such as a servo motor.
- the connection ring 6 is not in direct contact with the outer ring 4.
- the outer peripheral ring 4 is supported by the connection ring 6 via three balls 12 (connecting members) sandwiched between the two parts rather than the surface.
- connection ring 6 is SUS (thermal conductivity: 16.7 W / m ⁇ K).
- the ball 12 as the connecting member is intended to support the outer ring 4 and to thermally separate the outer ring 4 and the connection ring 6 as a part of the lifting device 20.
- the sphere 12 as a member has a thermal conductivity smaller than that of the outer peripheral ring 4 as a substrate support plate.
- the sphere 12 is made of a material having a smaller heat transfer coefficient than that of the connection ring 6 such as quartz or ceramics, and is fitted into a groove 13 provided on the connection ring 6.
- the sphere 12 is quartz (thermal conductivity: 1.38 W / m ⁇ K).
- three grooves 13 are provided on the circumference of the connection ring 6 at an equal distribution, and one sphere is fitted in each groove.
- the depth of the groove 13 is smaller than the diameter of the sphere 12. Therefore, when the sphere 12 is fitted into the groove 13, the upper half portion of the sphere 12 protrudes from the groove 13.
- the shape of the groove 13 is an ellipse, and the direction of the long axis (longitudinal direction, that is, the direction in which the groove 13 extends) is the radial direction of the connection ring 6 (the direction from the outer edge of the ring toward the center).
- a groove 14 (hereinafter referred to as a V-shaped cross section) having a cross-section (V-shaped cross section) in which the V shape of the alphabet is turned upside down on the lower surface of the outer ring 4 (the surface facing the lamp 11, that is, the lifting mechanism 20 side). V-groove) is formed (see FIG. 5).
- the number, position, and longitudinal direction of the V grooves 14 are provided so as to face the grooves 13 on the connection ring 6 side. Therefore, the extending direction (longitudinal direction) of the V groove 14 is the radial direction of the outer peripheral ring 4.
- the sphere 12 fitted in the connection ring 6 comes into contact with the slope portion of the V-groove 14 and is stabilized.
- the diameter of the sphere 12 is longer than the height of the recess of the groove 13 (groove depth).
- the outer ring 4 and the elevating mechanism 20 side can be separated by a coupling portion (the sphere 12 that is a connecting member) between the outer ring 4 and the elevating mechanism 20.
- the first problem can be solved by this embodiment.
- bond part of the outer periphery ring 4 and the raising / lowering mechanism 20 for moving this outer periphery ring 4 up and down is not rigidly connected, even if there exists thermal expansion, it is not structurally restrained.
- the outer peripheral ring 4 and the connection ring 6 included in the lifting mechanism 20 are coupled to both the outer peripheral ring 4 and the connection ring 6 via a sphere 12 that is a separate member.
- the outer ring 4 and the connection ring 6 are formed with grooves in the radial direction, and the sphere 12 sandwiched between them has a degree of freedom of movement in the radial direction.
- a ring-shaped part expands in diameter when heated to a high temperature. Even if the outer ring 4 and the connection ring 6 become hot and expand in the radial direction due to thermal expansion, even if there is a difference in the thermal expansion speed between the outer ring 4 and the connection ring 6, 12 follows to some extent and is not structurally constrained. That is, as described above, since the longitudinal direction of the groove 13 and the V-groove 14 is set along the radial direction in which the outer ring 4 and the connection ring 6 spread due to thermal expansion, the outer ring 4 and the connection ring 6 are set.
- the sphere 12 can move in both the groove 13 and the V-groove 14 even if they are thermally expanded due to different thermal expansion coefficients, and the stress applied in the radial direction by the thermal expansion (the connection between the sphere 12 and the outer ring 4). And stress applied to the connecting portion between the sphere 12 and the connection ring 6).
- the groove 13 whose longitudinal direction is set in the radial direction of the connection ring 6 and the V-groove 14 whose longitudinal direction is set in the radial direction of the outer peripheral ring 4 are used as the stress relaxation guide. Function.
- the ball 12 and the wall of the groove 13 and / or the V-groove 14 may slip at the contact point, it is possible to prevent excessive friction. For the above reasons, excessive thermal stress does not occur in the outer ring 4 or the connection ring 6 that is a part of the lifting mechanism 20, and the risk of breakage can be reduced.
- the sphere 12 is used as a connecting member between the outer ring 4 and the connection ring 6 included in the lifting device 20, but the shape is not limited to the sphere.
- the connecting member that connects the outer ring 4 and the lifting device 20 is a separate member from both the outer ring 4 and the lifting device 20, so that the outer ring 4 and the lifting device 20 are rigidly connected. Can be linked by no bond. That is, by making the connecting member a separate member from both the outer ring 4 and the lifting device 20, even if the outer ring 4 and the connection ring 6 have different coefficients of thermal expansion, the difference in the coefficient of thermal expansion can be obtained. Can be relaxed.
- the shape of the connecting member is the same as that of the groove (for example, the V-groove 14) formed in the substrate support plate (for example, the outer peripheral ring 4) to be connected to the connecting member. It is preferable to make the shape at least slidable with both the wall surface and the wall surface of the groove (for example, the groove 13) formed in the substrate support plate holding portion (for example, the connection ring 6) of the lifting device.
- the shape is slidable at least with both the substrate support plate and the lifting device to be connected to the connection member in this way, for example, any shape such as a confetti shape, a rugby ball shape, a cylindrical shape, a prismatic shape, a rectangular parallelepiped shape, etc.
- the connecting member is at least slidable with both the substrate support plate and the lifting device to be connected, so that the substrate support plate and the lifting device for raising and lowering the substrate support plate are different in thermal expansion. Even in the case of thermal expansion at a rate, the substrate support plate can be supported on the lifting device while alleviating the difference in thermal expansion.
- the problem of heat escape which is the second problem, can be solved by making the contact area between the outer ring 4 and the connection ring 6 as small as possible.
- the outer ring 4 is supported with respect to the connection ring 6 via the three balls 12 sandwiched between the two parts instead of the surface. That is, the number of locations where the sphere 12 contacts the outer ring 4 and the connection ring 6 is 2 points per sphere, that is, only 6 points in total. The smaller the area of these contacts, the less heat transfer.
- the thermal conductivity of the sphere 12 that is a connecting member between the outer ring 4 and the connection ring 6 is made smaller than that of the outer ring 4, the sphere 12 moves from the outer ring 4 to the connection ring 6. It will function as a screen for heat flow. Therefore, heat escape from the outer ring 4 to the connection ring 6 can be reduced.
- the lamp 11, the outer ring 4, the connection ring 6, and the shaft 7 are arranged in this order from the top to the bottom in the direction of gravity, the lamp light from the lamp 11 enters the shaft 7. Can be blocked by the outer ring 4. Furthermore, as described above, heat transfer from the heated outer ring 4 to the connection ring 6 can also be reduced. Accordingly, since heat due to the heating process is not easily transmitted to the shaft 7 of the lifting device 20, it is possible to reduce the space around the lifting device 20 from becoming high temperature.
- the present embodiment proposes a mechanism for separating and joining the outer ring 4 and the connection ring 6 (that is, the lifting device 20), which is a lower structure than the outer ring 4, without being rigidly connected.
- the ball 12 as the connecting member
- the groove 13 formed in the connection ring 6, and the V groove 14 formed in the outer ring 4 the positional relationship between the outer ring 4 and the connection ring 6 is shifted. Can be reduced.
- the temperature of the peripheral ring 4 and the surroundings of the elevating device which is a driving unit for moving the wafer W up and down, rise with the wafer W.
- Each part is often made of different materials, and the degree of contact with the lamp light is also different.
- the outer ring 4 and the lifting device 20 which is a lower structure.
- the outer peripheral ring 4 according to the present invention plays a role of supporting the wafer W in the first place.
- the change in the position of the outer peripheral ring 4 causes the wafer W to be displaced and the wafer W to be detached from the wafer support pins 5, thereby hindering the conveyance.
- the positional relationship between the wafer W and the outer ring 4 changes, the temperature distribution of the wafer W changes.
- the ball 12, the groove 13 formed in the connection ring 6, and the V groove 14 formed in the outer ring 4 are employed as a connection mechanism between the outer ring 4 and the lifting device 20. That is, the V-shaped groove 14 is formed on the lower surface (the lower surface in the gravity direction) of the outer ring 4, and the oval groove 13 is formed on the upper surface (the upper surface in the gravity direction) of the connection ring 6. A mechanism in which the sphere 12 is sandwiched is used. Positioning the outer ring 4 with good reproducibility by the wedge effect when the sphere 12 is in contact with the inclined surface of the V-groove 14 and the interaction of the combination of the sphere 12, the groove 13 and the V-groove 14 disposed at three locations. Can do.
- One is preferably a V-groove.
- the outer ring 4 and the connection ring 6 are not structurally rigidly connected because of the separable structure. Therefore, even if the outer peripheral ring 4 is heated together with the wafer W during heating, it is possible to reduce the risk of generation of excessive thermal stress due to thermal expansion and damage due to interference between components. Even if the outer ring 4 contracts during cooling of the outer ring 4, the outer ring and the connection ring 6 are not rigidly connected, so that the risk of breakage can be similarly reduced.
- the contact area of a connection member and the outer periphery ring 4 is very small (only the point contact of 12 balls and the V-groove 14 slope). Thereby, the heat escape from the outer periphery ring 4 can be decreased. Furthermore, a positioning mechanism for the outer ring 4 is provided at the joint between the outer ring 4 and the connection ring 6. Thereby, even in the case of continuous processing, the positional deviation of the wafer W and the outer ring 4 can be reduced.
- the positioning mechanism itself does not require a sensor or actuator, and is simple and low-cost.
- a substrate cooling mechanism for cooling the substrate and a substrate support plate cooling mechanism for cooling the substrate support plate are provided. That is, the outer peripheral ring 4 that supports the wafer W is heated by the elevating device 20 that is a driving mechanism by receiving the irradiation of the lamp light emitted from the lamp 11 above the vacuum chamber 1 as the processing chamber (upward in the gravity direction). .
- a cooling stage as a substrate cooling mechanism capable of placing the wafer W on the lower part (lower side in the direction of gravity) of the vacuum chamber 1 is installed, and the heated wafer W can be forcibly cooled. .
- a cooling plate as a substrate support plate cooling mechanism capable of mounting at least a region 4a facing the outer edge of the wafer W of the outer peripheral ring 4 is installed at a lower portion of the cooling stage, and at least The region 4a facing the outer edge of the wafer W of the outer peripheral ring 4 after heating can be cooled.
- heat removal means such as flowing cooling water is provided inside the cooling stage and the cooling plate.
- the wafer W in the substrate heat treatment apparatus shown in FIG. 1, can be placed on the lower side in the gravity direction of the outer peripheral ring 4, and the placed wafer W can be cooled.
- a configured cooling stage 8 is provided.
- a cooling plate 9 configured to mount at least a region 4a facing the outer edge of the wafer W of the outer peripheral ring 4 below the cooling stage 8 in the direction of gravity and to cool the mounted region 4a. Is provided. Both the cooling stage 8 and the cooling plate 9 have a flow path formed therein so that cooling water can flow.
- FIG. 6 shows the shape and arrangement of the wafer W, the outer ring 4 and the cooling stage 8.
- the inner circle diameter d2 of the outer peripheral ring 4 is somewhat smaller than the outer diameter d1 of the wafer, and the wafer support pins 5 are arranged at equal distribution on the inner circle edge and the periphery of the outer ring 4.
- the wafer W is horizontally supported by the tips of the plurality of wafer support pins 5.
- the wafer W and the outer ring 4 are arranged concentrically.
- the cooling stage 8 is also concentrically arranged at the lower part (for example, the bottom part) of the vacuum chamber 1, and its diameter d3 is smaller than the inner circular diameter of the outer peripheral ring 4 (d1> d2> d3).
- the diameter of the cooling plate 9 is larger than the diameter d3 of the cooling stage 8, and the cooling plate 9 is in contact with the lower surface of the cooling stage 8 and the upper surface of the cooling plate 9, and the outer edge portion of the upper surface of the cooling plate 9 is It is arranged to be exposed.
- a region 4a facing the outer edge portion of the wafer W of the outer peripheral ring 4 is placed on the exposed outer edge portion 9a of the cooling plate 9.
- the outer peripheral ring 4 supporting the heated wafer W is driven and lowered by the actuator 15.
- there is a sufficient space (escape: the exposed outer edge portion 9a of the cooling plate 9) to accommodate the region 4a facing the outer edge portion of the wafer W of the outer peripheral ring 4 that has moved to the lower outer side of the cooling stage 8. )
- the wafer W is transferred to the cooling stage 8 when the level of the tip of the wafer support pin 5 reaches the same level as the surface of the cooling stage 8 while the outer peripheral ring 4 is being lowered.
- the cooling plate 9 is a member having a flat surface portion (exposed outer edge portion 9a) on which the outer peripheral ring 4 can be placed, and is provided with heat removal means such as flowing cooling water inside. Or a part of the vacuum chamber 1 (bottom surface or the like).
- the configuration characteristic of the present invention described in the first embodiment is effective, and the reliability of the mechanism is improved.
- the outer ring 4 is not rigidly connected to the structure part (elevating device 20) below the gravitational direction, and is placed on the connection ring 6 with the ball 12 interposed therebetween. If the outer ring 4 and the structure portion below it are rigidly connected by screw fastening or the like, the outer ring 4 may be excessively pressed against the cooling plate 9 when the outer ring 4 is placed on the cooling plate 9. There is.
- the connecting ring 6 is further lowered after the outer ring 4 is placed on the cooling plate 9, the outer ring 4 and the connecting ring 6 are separated, and the outer ring 4 is completely attached to the cooling plate 9. Can be put in. Therefore, the outer ring 4 is not pressed against the cooling plate 9 and no gap is formed between the outer ring 4 and the cooling plate 9. Further, when the outer ring 4 is cooled, it contracts.
- the mechanism according to this embodiment in which the outer ring 4 and the connection ring 6 are separated during cooling is not mechanically constrained. This can reduce the risk of breakage.
- the outer peripheral ring 4 is moved upward again by driving of the elevating device 20, and the next wafer W is loaded and the processing is continued. In this movement, the outer peripheral ring 4 is required to eliminate or reduce the deviation from the position where the previous wafer W is processed. The reason is the same as described above.
- the positioning mechanism provided in the connection part of the outer periphery ring 4 and the connection ring 6 acts effectively also to this request.
- the process flow in this embodiment will be described below.
- the wafer W is loaded into the vacuum chamber 1 through the loading port 3 from the wafer transfer system.
- the outer ring 4 waits at an appropriate position, and is placed on the tips of the three wafer support pins 5 that are projected on the outer ring 4 in cooperation with the arm of the wafer transfer robot.
- the elevating device 20 raises the outer peripheral ring 4 on which the wafer W is placed to a position where it is irradiated with lamp light (heating position) and stops. At this position, the wafer W is heated by being irradiated with the lamp light emitted from the lamp 11 (FIG. 7).
- the irradiated position can be arbitrarily set at a plurality of positions within the movable range of the outer ring 4.
- the elevating device 20 moves the outer peripheral ring 4 on which the heated wafer W is placed below the vacuum chamber 1. During the lowering, only the wafer W is delivered to the stage 8. The wafer W is cooled on the stage 8 placed thereon. Here, the wafer W immediately after heating has a high temperature, and in order to prevent damage to the wafer W due to thermal shock, the wafer W may wait until it is lowered to an appropriate temperature before being placed on the cooling stage 8.
- the elevating device 20 further lowers the outer peripheral ring 4 that has transferred the wafer W to the cooling stage 8, and the outer edge portion 9 a of the outer peripheral ring 4 that faces the outer edge portion of the wafer W is exposed on the cooling plate 9. The outer peripheral ring 4 is cooled. Here, the outer ring 4 and the connection ring 6 are separated.
- the elevating device 20 leaves the outer ring 4 on the cooling plate 9, further lowers the connection ring 6, and stops at a predetermined lowest point.
- the process proceeds to a step of unloading the cooled wafer W out of the chamber 1.
- the elevating device 20 raises the connection ring 6 and joins with the outer peripheral ring 4 placed on the cooling plate 9.
- the outer ring 4 is positioned by the sphere 12, the groove 13, and the V-groove 14. That is, an oval groove 13 is formed on the circumference of the connection ring 6 and the sphere 12 is fitted.
- the spheres 12 are provided at three locations on the circumference of the connection ring 6.
- the outer peripheral ring 4 is installed on the connecting ring 6 with a sphere 12 sandwiched therebetween.
- the outer ring 4 and the connection ring 6 are united and continue to rise, and the tip of the wafer support pin 5 protruding from the outer ring 4 is at the level of the stage 8 surface. When it reaches, the wafer W is lifted from the stage 8.
- the elevating device 20 raises the wafer W supported by the three wafer support pins 5 together with the outer ring 4 and the connection ring 6 and stops at an appropriate position (transfer position). The wafer W is unloaded through the loading port 3 in cooperation with the arm of the wafer transfer robot.
- the ring (outer peripheral ring) placed on the outer periphery of the wafer in order to obtain the temperature uniformity of the wafer W is effectively cooled every time the wafer is processed. can do.
- the outer ring 4 is moved up and down by the actuator 15 and placed on the cooling plate 9. At this time, the outer ring 4 is separated from the drive unit (lifting device 20) side including the actuator. For this reason, the outer periphery ring 4 is pressed against the cooling plate 9 during cooling and is not damaged.
- the outer peripheral ring 4 is naturally placed on the cooling plate 9, it can be contacted without any gap between the two parts and can be cooled effectively.
- the cooling stage 8 may be provided with an electrostatic chuck (ESC: Electro Static Chucking).
- ESC Electro Static Chucking
- electrostatic adsorption a voltage is applied between the wafer W and the cooling stage 8 provided with the dielectric layer, and the wafer W is adsorbed and fixed by the force generated between the two.
- the application of voltage is stopped and the adsorption is released, but a part of the electric charge remains (residual electric charge) and the adsorption force remains in the dielectric layer. If the wafer support pins attempt to lift and hold the wafer in this state, the remaining attracting force acts as a repulsive force, causing a problem that the wafer W jumps up, shifts or cracks in an unintended direction.
- the wafer W when the wafer W is detached from the cooling stage 8 adsorbed by the electrostatic chuck, the wafer W is grounded (grounded) to remove residual charges.
- the wafer support pins 5, the outer ring 4, the sphere 12, and the connection ring 6 are made of a material having electrical conductivity, and a ground circuit is formed so that the connection ring 6 can be grounded as desired. Is effective.
- the wafer support pins 5 and the outer ring 4 are made of a material having electrical conductivity, so that the substrate support plate has electrical conductivity, and the sphere 12 as a connecting member is also made of a material having electrical conductivity.
- the connection ring 6 which is a mounting part of the board
- a switch (mechanical contact) 17 is provided, and by switching the switch 17, the connection ring 6 can be connected to the ground G as desired to form a ground circuit. Therefore, the charge remaining on the wafer W can be released by the ground circuit.
- the wafer support pins 5 and the balls 12 are preferably made of a material having a low heat transfer coefficient for the purpose of reducing heat escape.
- a material having a small coefficient of thermal expansion is desired in order to reduce expansion and deformation due to heat. Therefore, for example, it is conceivable that quartz or ceramics having no electrical conductivity is used as the wafer support pins 5 and the spheres 12. In such a case, a similar effect can be obtained by providing a mechanical contact (switch 17) at a location where the ground circuit is interrupted (for example, the outer ring 4) and operating it at an appropriate timing. it can.
- the cooling stage 8 when the cooling stage 8 is electrostatically attracted by the electrostatic chuck, it is possible to suppress the wafer desorption error by reliably grounding the residual charge of the wafer W.
- the embodiment and process flow described above are cases in which an embodiment of the present invention is applied to an apparatus for heating a wafer in a vacuum.
- the lamp heat treatment may be performed in a space substituted with nitrogen at atmospheric pressure, and the mechanism proposed in one embodiment of the present invention is not limited to application only with a vacuum apparatus.
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Abstract
Description
図1は、本実施形態に係る、基板に対して熱処理を行う基板熱処理装置の模式図である。図1において、符号1はチャンバー、符号2は排気口、符号3はウエハWの搬入ポートである。チャンバー1は、排気口2を通じて排気系に接続される。排気系は適切に選択された真空ポンプ、バルブ、ゲージ類により形成され、チャンバー1内部を所望の圧力に真空排気することができる。搬入ポート3を通じてウエハ搬送系から、処理前のウエハWを搬入、処理後のウエハWを搬出する。チャンバー1の天板部分には光透過材料で製作された光入射窓10がある。光入射窓10の上側(すなわち、後述する外周リング5に載置されたウエハWの重力方向上側)には加熱手段としてのランプ11が設けられており、ランプ11の光が光入射窓を通して入射されウエハWを加熱する。なお、上記加熱手段は、ランプに限らず、例えば加熱プレートなど、熱を放出し、該熱により離間して設けられた基板を加熱できればいずれの構成であっても良い。
環状部材である外周リング4はウエハWを支持するための基板支持板であり、ランプ11からのランプ光が入射するように、すなわち、ランプ11に臨むように配置されている。該外周リング4にはウエハ支持ピン5が設けられている。本実施形態では、ウエハ支持ピン5は3本用いられる。外周リング4は、連結部材としての球12を介して昇降機構20に載置される。連結部材としての球12は、外周リング4と少なくとも摺動可能に構成されているので、外周リング4は、昇降機構20に剛結されていない。
本実施形態では、外周リング4と該外周リング4を上下動させるための昇降機構20との結合部が剛結されていないため、熱膨張があっても構造的に拘束されない。すなわち、外周リング4と昇降機構20が有する接続リング6とは、外周リング4および接続リング6の双方と別個の部材である球12を介して連結されている。上記のごとく外周リング4、接続リング6には径方向に溝が形成され、それらの間にはさみ込まれた球12には径方向に動きの自由度がある。リング状の部品は高温に加熱されると径が拡がる。外周リング4、接続リング6が高温になって熱膨張により径方向に拡がっても、さらには外周リング4と接続リング6との間に熱膨張の速度に差があっても、この動きに球12がある程度追従し、構造的に拘束されることはない。すなわち、上述のように、熱膨張により外周リング4および接続リング6が広がる方向である径方向に沿って溝13およびV溝14の長手方向が設定されているので、外周リング4および接続リング6が異なる熱膨張率により熱膨張しても、球12は、溝13およびV溝14内の双方を移動することができ、熱膨張により径方向にかかる応力(球12と外周リング4との連結部にかかる応力、および球12と接続リング6との連結部にかかる応力)を緩和することができる。このように、本実施形態では、接続リング6の径方向に長手方向が設定された溝13、および外周リング4の径方向に長手方向が設定されたV溝14は、上記応力緩和のガイドとして機能する。
また完全に追従することが不可能で球12と溝13および/またはV溝14の壁とが接触点で滑ることがあるとしても過度な摩擦は防ぐことができる。以上の理由により、外周リング4や昇降機構20の一部である接続リング6には過度な熱応力が生じず、破損のリスクを低下させることができる。
また、外周リング4と接続リング6の結合部では、連結部材と外周リング4との接触面積が極めて小さい(12球とV溝14斜面との点接触のみ)。これにより、外周リング4からの熱逃げを少なくすることができる。 さらに、外周リング4と接続リング6の結合部に、外周リング4の位置決め機構を有する。これにより、連続処理する場合でも、ウエハWや外周リング4の位置ずれを低減することができる。位置決め機構は、それ自体にセンサやアクチュエータを必要とせず、シンプルかつ低コストである。
さて、ウエハWの加熱と冷却とを同一のチャンバー(特に真空チャンバー)内で行う場合、加熱後のウエハWと外周リング4とをいかに速やかに冷却するかということが重要となる。特に真空中でウエハWを処理する装置の場合、難しい問題となる。電子デバイスの製造装置においては、時間当たりの処理数(スループット)が重要である。真空中でウエハWを加熱処理する装置の場合、第1の実施形態で説明したように、真空チャンバー1外部に設置されたランプ11の光を、真空チャンバー1の一面に設けられた光入射窓10を通して入射すれば、ランプ11に対向して載置されたウエハWをふく射により効果的に加熱することができる。
(1)ウエハ搬送系から、真空チャンバー1内に搬入ポート3を通してウエハWが搬入される。外周リング4が適切なポジションでこれを待ち受け、ウエハ搬送ロボットのアームと連携して外周リング4の上に突き立てられた3本のウエハ支持ピン5の先端に載せる。
(2)昇降装置20は、ウエハWを載せた外周リング4を、ランプ光を照射するポジション(加熱位置)まで上昇させて静止する。このポジションで、ウエハWは、ランプ11から照射されたランプ光の照射を受けて加熱される(図7)。なお、照射されるポジションは外周リング4の可動範囲内において、任意に複数箇所設定することができる。
(4)昇降装置20は、ウエハWを冷却ステージ8に引き渡した外周リング4を、さらに下降させ、外周リング4のウエハWの外縁部と対向する領域4aを冷却プレート9の露出した外縁部9aに載置し、外周リング4を冷却する。ここで外周リング4と接続リング6は分離する。
(5)昇降装置20は、外周リング4を冷却プレート9上に残して、接続リング6をさらに下降させ、定められた最下点で停止する。
昇降装置20は、接続リング6を上昇させ、冷却プレート9に載置されている外周リング4と結合する。外周リング4は、このとき球12、溝13、およびV溝14により位置決めされる。すなわち、接続リング6の周上に長円形の溝13が形成され球12が、はめ込まれる。球12は上述のように接続リング6の周上3ヶ所設けられている。外周リング4は、接続リング6の上に球12をはさみ込んで設置される。
(7)昇降装置20の駆動により、外周リング4と接続リング6とは一体になって、さらに上昇を続け、外周リング4に突き立てられたウエハ支持ピン5の先端がステージ8表面のレベルに達したところでウエハWをステージ8から持ち上げる。
(8)昇降装置20は、3本のウエハ支持ピン5に支持されたウエハWを、外周リング4、接続リング6とともに上昇させ、適切なポジション(搬送位置)で停止する。ウエハWは、ウエハ搬送ロボットのアームと連携し、搬入ポート3を通して、搬出される。
外周リング4は、アクチュエータ15により上下動され、冷却用プレート9に載置される。このとき外周リング4は、アクチュエータを含む駆動部(昇降装置20)側と分離する。このため外周リング4は冷却時、冷却プレート9に押し付けられて破損することはない。また外周リング4は、冷却プレート9の上に自然に載置されるため、両部品の間に隙間ができることなく接し、効果的に冷却を行うことができる。
本実施形態では、第2の実施形態において、冷却ステージ8に静電チャック(ESC:Electro Static Chucking)を設けても良い。
Claims (6)
- 基板に対して熱処理を行う基板熱処理装置であって、
基板を支持可能な基板支持板と、
前記基板支持板を保持可能に構成され、前記基板支持板を昇降させる昇降機構と、
前記基板支持板と前記昇降機構とを連結する連結部材であって、前記基板支持板の熱伝導率よりも小さい熱伝導率を有する連結部材と、
前記基板支持板に支持された基板を、該基板支持板の重力方向上側から加熱する加熱手段と、を備え、
前記連結部材は、前記基板支持板および前記昇降機構の双方とは別個の部材であり、
前記昇降機構は、前記基板支持板を前記加熱手段に対して近接した第1の位置と離れた第2の位置との間で昇降させる昇降手段を有することを特徴とする基板加熱処理装置。 - 前記連結部材は球であり、
前記基板支持板は、該基板支持板の重力方向下側の面に設けられた第一の溝を有し、
前記昇降機構は、前記基板支持板を保持可能な基板支持板保持部と、該基板支持板保持部の重力方向上側の面に設けられた第二の溝とを有し、
前記球が、前記第一の溝と前記第二の溝との間に挟みこまれることにより、前記昇降機構は、前記基板支持板を保持することを特徴とする請求項1に記載の基板加熱処理装置。 - 前記第一の溝および第二の溝の少なくとも一方がV字断面を有するV溝であり、
前記第一の溝、第二の溝、および前記球が、前記球が前記V溝の斜面に接するときのくさび作用による位置決め機構を形成していることを特徴とする請求項2に記載の基板加熱処理装置。 - 前記第一の溝は、V溝であり、
前記球の直径は前記第二の溝の凹部の高さよりも長いことを特徴とする請求項3に記載の基板加熱処理装置。 - 前記基板支持板は、環状部材であることを特徴とする請求項1に記載の基板加熱処理装置。
- 前記基板支持板は、該基板支持板の重力方向下側の面に設けられた第一の溝を有し、
前記昇降機構は、前記基板支持板を保持可能な基板支持板保持部と、該基板支持板保持部の重力方向上側の面に設けられた第二の溝とを有し、
前記連結部材は、前記第一の溝の壁面および前記第二の溝の壁面の双方と少なくとも摺動可能に構成された部材であり、
前記連結部材が、前記第一の溝と前記第二の溝との間に挟みこまれることにより、前記昇降機構は、前記基板支持板を保持することを特徴とする請求項1に記載の基板加熱処理装置。
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PCT/JP2010/073019 WO2012086012A1 (ja) | 2010-12-21 | 2010-12-21 | 基板熱処理装置 |
JP2012549513A JP5487327B2 (ja) | 2010-12-21 | 2010-12-21 | 基板熱処理装置 |
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KR20150010521A (ko) * | 2013-07-19 | 2015-01-28 | 삼성디스플레이 주식회사 | 기상 증착 장치 및 이를 이용한 표시 장치의 제조방법 |
JP2016219509A (ja) * | 2015-05-15 | 2016-12-22 | 富士電機株式会社 | 加熱冷却方法及び加熱冷却機器 |
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JP6770915B2 (ja) * | 2017-03-08 | 2020-10-21 | 株式会社Screenホールディングス | 熱処理装置 |
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Also Published As
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KR20130103604A (ko) | 2013-09-23 |
US9607868B2 (en) | 2017-03-28 |
CN103270579A (zh) | 2013-08-28 |
US20130272686A1 (en) | 2013-10-17 |
JP5487327B2 (ja) | 2014-05-07 |
JPWO2012086012A1 (ja) | 2014-05-22 |
KR101559022B1 (ko) | 2015-10-08 |
CN103270579B (zh) | 2016-03-09 |
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