WO2009116472A1 - 載置台構造及び熱処理装置 - Google Patents
載置台構造及び熱処理装置 Download PDFInfo
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- WO2009116472A1 WO2009116472A1 PCT/JP2009/054937 JP2009054937W WO2009116472A1 WO 2009116472 A1 WO2009116472 A1 WO 2009116472A1 JP 2009054937 W JP2009054937 W JP 2009054937W WO 2009116472 A1 WO2009116472 A1 WO 2009116472A1
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- Prior art keywords
- mounting table
- heat
- heat reflecting
- table structure
- mounting
- Prior art date
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 65
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Images
Classifications
-
- 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
- H01L21/68792—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 the construction of the shaft
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
- C23C16/4582—Rigid and flat substrates, e.g. plates or discs
- C23C16/4583—Rigid and flat substrates, e.g. plates or discs the substrate being supported substantially horizontally
- C23C16/4586—Elements in the interior of the support, e.g. electrodes, heating or cooling devices
-
- 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
-
- 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
Definitions
- the present invention relates to a heat treatment apparatus and a mounting table structure for performing a predetermined heat treatment on an object to be processed such as a semiconductor wafer.
- a desired integrated circuit is obtained by repeatedly performing various processes such as a film forming process, an etching process, a heat treatment, a modification process, and a crystallization process on a target object such as a semiconductor wafer.
- a necessary processing gas corresponding to the type of the process for example, a film forming gas or a halogen gas in the case of a film forming process, and an ozone gas in the case of a reforming process.
- an inert gas such as N 2 gas or O 2 gas is introduced into the treatment container.
- a mounting table with a built-in resistance heater is installed in a processing container that can be evacuated.
- a semiconductor wafer is placed on the upper surface, and a predetermined processing gas is flowed in a state heated at a predetermined temperature (for example, 100 ° C. to 1000 ° C.), and various heat treatments are performed on the semiconductor wafer under predetermined process conditions.
- a predetermined temperature for example, 100 ° C. to 1000 ° C.
- a resistance heater is embedded as a heating element in a ceramic material such as AlN and integrally baked at a high temperature to form a mounting table.
- the mounting table structure is manufactured by welding the integrated baking side of the mounting table and the support column, for example, by heat diffusion bonding.
- the mounting table structure integrally formed in this way is provided upright at the bottom of the processing container.
- quartz glass having heat and corrosion resistance is used instead of the ceramic material.
- FIG. 10 is a sectional view showing an example of a conventional mounting table structure.
- This mounting table structure is provided in a processing vessel that can be evacuated.
- this mounting table structure has a disk-shaped mounting table 2 made of a ceramic material such as AlN. is doing.
- a cylindrical column 4 made of a ceramic material such as AlN is joined and integrated at the center of the lower surface of the mounting table 2 by, for example, thermal diffusion bonding. Therefore, both are airtightly joined by the thermal diffusion joining portion 6.
- the size of the mounting table 2 described above is about 350 mm in diameter when the semiconductor wafer size is 300 mm, for example, and the diameter of the column 4 is about 50 to 60 mm.
- a heating means 8 such as a heater is provided in the mounting table 2 to heat the semiconductor wafer W as a target object on the mounting table 2.
- the lower end of the support column 4 is in an upright state by being fixed to the container bottom 9 by a fixing block 10. And the connecting terminal 12 with respect to the said heating means 8 is provided in the center part of the lower surface of the said mounting base 2 by making a hole in this.
- a power supply rod 14 whose upper end is connected to the connection terminal 12 of the heating means 8 is provided, and the lower end side of the power supply rod 14 is interposed through an insulating member 16. And penetrates the bottom of the container downward and is drawn out.
- the mounting table 2 itself is in a high temperature state.
- the material constituting the support column 4 is made of a ceramic material having a thermal conductivity that is not so good.
- the mounting table 2 and the column 4 are joined by thermal diffusion, it is inevitable that a large amount of heat escapes from the center side of the mounting table 2 to the column 4 side through the column 4.
- FIG. 11 is a temperature distribution diagram showing an example of the temperature distribution on the surface of the mounting table 2.
- the temperature distribution when the film forming process is performed with the process temperature set at 650 ° C. is shown, and isotherms at intervals of “2 ° C.” are shown. According to this, it can be seen that the temperature at the center of the mounting table 2 is the lowest and a cool spot is generated here, and a maximum temperature difference of about 23 ° C. occurs in the surface of the mounting table 2.
- the temperature of the mounting table 2 reaches 700 ° C. or more, so the temperature difference becomes considerably large. In addition to this, damage due to the thermal stress due to repeated heating and lowering of the mounting table. Has been promoted.
- An object of the present invention is to prevent a cool spot from being generated at the center of the mounting table, to prevent the mounting table itself from being damaged, and to achieve in-plane uniformity of heat treatment on the object to be processed.
- An object of the present invention is to provide a mounting table structure and a heat treatment apparatus that can be enhanced.
- the present invention provides a mounting table structure for mounting a target object to be heat-treated provided in a processing container of a heat treatment apparatus, and a mounting table for mounting the target object, A cylindrical column that is connected to the center of the lower surface and supports the mounting table, and a heat reflecting unit that is provided in the upper part of the column so as to be close to the lower surface of the mounting table.
- This is a mounting table structure.
- the heat reflecting portion is provided in the upper part of the cylindrical column supporting the mounting table so as to be close to the lower surface of the mounting table.
- the radiant heat radiated from the lower surface of the center portion of the mounting table can be reflected back by the heat reflecting portion.
- it is possible to prevent the cool spot from being generated at the center of the mounting table, to prevent the mounting table itself from being damaged, and to improve the in-plane uniformity of the heat treatment for the object to be processed. it can.
- the heat reflecting portion is composed of a single heat reflecting plate or a plurality of heat reflecting plates arranged in a plurality of stages.
- the heat reflecting plate includes a heat insulating plate and a heat reflecting layer provided on the upper surface side of the heat insulating plate.
- the heat reflecting plate includes a metal plate or a metal layer.
- the metal plate is made of one material selected from the group consisting of copper, aluminum, aluminum alloy, gold, and stainless steel.
- the heat insulating plate is made of a ceramic material.
- the heat reflecting portion is supported by a support bar that stands up from the bottom of the processing container.
- the mounting table is provided with a heating means for heating the object to be processed, a power supply rod for supplying power to the heating means is provided in the support column, and the support rod is formed in a pipe shape.
- the power feeding rod is inserted into the support rod.
- the mounting table is provided with a mounting table electrode, and a power supply rod for supplying power to the mounting table electrode is provided in the support column, and the support bar is formed in a pipe shape, The power feeding rod is inserted into the support rod.
- the support rod is made of a metal or a ceramic material.
- the heat reflecting portion is supported on the inner wall of the support column.
- the present invention relates to a heat treatment apparatus for performing a predetermined heat treatment on an object to be processed, and a processing container that can be evacuated, and a mounting table provided for mounting the object to be processed in the processing container.
- a heat treatment apparatus comprising: a heat treatment apparatus.
- the heat reflecting portion is provided in the upper part of the cylindrical column supporting the mounting table so as to approach the lower surface of the mounting table. Radiant heat radiated from the lower surface of the central portion can be reflected by the heat reflecting portion and returned. As a result, it is possible to prevent the cool spot from being generated at the center of the mounting table, to prevent the mounting table itself from being damaged, and to improve the in-plane uniformity of the heat treatment for the object to be processed. it can.
- FIG. 1 is a block diagram showing a heat treatment apparatus using a mounting table structure according to the present invention.
- FIG. 2 is a partially enlarged perspective view schematically showing a part of the mounting table structure.
- FIG. 3 is a cross-sectional view schematically showing the mounting table structure.
- FIG. 4 is an enlarged cross-sectional view schematically showing a joint portion between the mounting table and the column.
- FIG. 5 is an exploded perspective view showing an example of a support rod for supporting the heat reflecting plate.
- FIG. 6 is a graph showing the relationship between the wavelength of heat rays (light) and the emissivity / absorption rate.
- FIG. 7 is an enlarged sectional view showing the structure of the first modified embodiment of the heat reflecting portion.
- FIG. 1 is a block diagram showing a heat treatment apparatus using a mounting table structure according to the present invention.
- FIG. 2 is a partially enlarged perspective view schematically showing a part of the mounting table structure.
- FIG. 3 is a cross-sectional view
- FIG. 8 is a diagram showing a structure of a second modified embodiment of the heat reflecting portion.
- FIG. 9 is a partial enlarged cross-sectional view showing the structure of the third modified embodiment of the heat reflecting portion.
- FIG. 10 is a sectional view showing an example of a conventional mounting table structure.
- FIG. 11 is a temperature distribution diagram showing an example of the temperature distribution on the surface of the mounting table.
- FIG. 1 is a block diagram showing a heat treatment apparatus using a mounting table structure according to the present invention
- FIG. 2 is a partially enlarged perspective view schematically showing a part of the mounting table structure
- FIG. 3 schematically shows the mounting table structure
- 4 is an enlarged cross-sectional view schematically showing a joint portion between the mounting table and the support column
- FIG. 5 is an exploded perspective view showing an example of a support bar for supporting the heat reflecting plate.
- the heat treatment apparatus 20 includes a processing container 22 formed into a cylindrical shape using, for example, an aluminum alloy.
- a processing container 22 formed into a cylindrical shape using, for example, an aluminum alloy.
- an exhaust space 24 is provided by being recessed downward in a convex shape, and is formed by a bottomed cylindrical partition wall 26, and the bottom of the partition wall 26 is the bottom of the vessel. It has become a part of.
- An exhaust port 28 is provided on the side wall of the partition wall 26, and an exhaust pipe 30 having a pressure adjusting valve, a vacuum pump, and the like (not shown) interposed therebetween is connected to the exhaust port 28.
- the processing vessel is adapted to evacuate 22 to the desired pressure. In some cases, the heat treatment may be performed near atmospheric pressure without using plasma.
- a loading / unloading port 32 for loading / unloading a semiconductor wafer W as an object to be processed is formed on the side wall of the processing container 22, and a gate valve 34 is provided at the loading / unloading port 32.
- the gate valve 34 is opened and closed when carrying in / out.
- a shower head 38 as a gas introducing means is provided through the insulating member 36 in the opening.
- a seal member 40 made of, for example, an O-ring is interposed between the shower head 38 and the insulating member 36 in order to maintain airtightness in the container.
- a gas introduction port 42 is provided in the upper part of the shower head 38, and a plurality of gas injection holes 44 are provided in the lower gas injection surface so as to inject a necessary processing gas toward the processing space S. It has become.
- the inside of the shower head 38 is a single space, but there is also a shower head of a type in which the internal space is divided into a plurality of parts and different gases are separately supplied to the processing space S without being mixed in the shower head 38. is there.
- the shower head 38 has a function as an upper electrode for plasma generation. Specifically, the shower head 38 is connected to a high frequency power supply 48 for plasma generation via a matching circuit 46. .
- the frequency of the high frequency power supply 48 is, for example, 13.56 MHz, but is not limited to this frequency.
- the mounting table structure 50 includes a mounting table 52 formed in a substantially disc shape on which a semiconductor wafer W is directly mounted on a mounting surface which is an upper surface thereof, and the mounting table 52 is supported upright from the bottom of the container. And a heat reflecting portion 56, which is a feature of the present invention and is provided in the upper portion of the column 54.
- the lifting pin mechanism 58 that pushes up and supports the semiconductor wafer W when it is loaded and unloaded.
- the lifting pin mechanism 58 has, for example, three (only two are shown in the drawing) lifting pins 60 arranged at equal intervals along the circumferential direction of the mounting table 52, and the lower ends of the lifting pins 60.
- the part is supported by an arcuate base plate 62, for example.
- the base plate 62 is connected to an elevating rod 66 that penetrates the bottom of the container and can be moved up and down by an actuator 64, and the through hole at the bottom of the container of the elevating rod 66 maintains the airtightness in the container.
- a bellows 68 that can be expanded and contracted to allow the lifting rod 66 to move up and down is provided.
- the mounting table 52 is provided with pin insertion holes 70 corresponding to the above-described lifting pins 60.
- the lifting pins 60 inserted through the pin insertion holes 70 can be moved up and down on the mounting surface to move the semiconductor wafer W up and down.
- the entire mounting table 52 and the entire support column 54 are made of a material having no metal contamination and excellent in heat resistance, such as a ceramic material or quartz.
- the column 54 is formed in a cylindrical shape here, and is airtightly bonded to the center of the lower surface of the mounting table 52 by heat diffusion bonding, welding, or the like.
- the lower end portion of the support column 54 is connected to a peripheral portion of an opening 74 formed in the bottom portion of the container via a seal member 72 such as an O-ring to maintain airtightness in the container by a bolt (not shown).
- a seal member 72 such as an O-ring
- the ceramic material aluminum nitride (AlN), aluminum oxide (Al 2 O 3 ), silicon carbide (SiC), quartz (SiO 2 ), or the like can be used.
- a chuck electrode 76 of an electrostatic chuck as a mounting table electrode and a heater part 78 as a heating means are embedded.
- a carbon wire heater can be used as the heater section 78.
- the chuck electrode 76 is provided immediately below the mounting surface to attract and hold the semiconductor wafer W by electrostatic force, and the heater portion 78 is provided below the chuck electrode 76 to heat the semiconductor wafer W. It has become.
- the chuck electrode 76 is also used as a lower electrode for plasma.
- the chuck electrode 76 and the heater portion 78 are made of a refractory metal, a compound thereof, or an alloy of the metal, and examples of the refractory metal include W, Mo, V, Cr, Mn, Nb, Ta. Etc., and Mo or W or an alloy thereof is mainly used.
- the heater section 78 is electrically separated into a plurality of, for example, two concentric circles, for example, two heating zones, that is, an inner heating zone 80A and an outer heating zone 80B, so that the temperature can be controlled for each zone. It has become. That is, two power supply rods 82A and 82B are connected to the portion of the heater portion 78 corresponding to the inner heating zone 80A, and the portion of the heater portion 78 corresponding to the outer heating zone 80B is connected to the portion of the heater portion 78 corresponding to the outer heating zone 80B. Two power supply rods 82C and 82D are connected to each other, and power control can be performed individually for each zone. Similarly, a power feed rod 82E is connected to the chuck electrode 76 which also serves as a lower electrode.
- FIG. 2 only two power supply rods 82A and 82B for the heater section 78 in the inner heating zone 80A are shown as representatives.
- the respective power supply rods 82A to 82E are concentrated in the central portion.
- FIG. 1 and FIG. 4 each power supply rod 82A to 82E is shown for easy understanding of the contents of the invention. Is expanded in the horizontal direction.
- the power supply rods 82A to 82E are inserted downward in the cylindrical support column 54 and extend downward from the opening 74 at the bottom of the container.
- the power supply rods 82A to 82D for the heater section 78 are connected to a heater power supply 86 via lines 84A, 84B, 84C and 84D, respectively.
- the power supply rod 82E for the chuck electrode 76 is connected to a DC power supply 88 for chuck and a high frequency power supply 90 for bias via a line 84E.
- the mounting table 52 is also provided with a rod-shaped thermocouple for temperature measurement that is inserted through the column 54.
- the heat reflection part 56 is provided in the upper part in such a support
- the heat reflecting portion 56 includes a plurality of heat reflecting plates 92A, 92B, 92C, 92D, and 92E, for example, at a predetermined pitch. It is comprised by arrange
- the heat reflecting plates 92A to 92E are set to have a diameter slightly smaller than the inner diameter of the support column 54, for example, and have a thickness of about 0.5 to 2.0 mm, thereby reducing the heat capacity itself. .
- the heat reflecting plates 92A to 92E are arranged in the vertical direction at a pitch of about 1.2 mm, for example.
- Each of the heat reflecting plates 92A to 92E is made of, for example, a metal plate such as copper, and reflects the radiant heat from the mounting table 52 positioned above it toward the mounting table 52 again.
- the metal plate one material selected from the group consisting of copper, aluminum, aluminum alloy, gold, and stainless steel can be used.
- the heat reflecting plates 92A to 92E are supported by support rods 94 standing in the support column 54 from the bottom of the processing vessel 22. Specifically, as shown in FIG. 5, here, there are five support rods 94A, 94B, 94C, 94D, 94E corresponding to the heat reflecting plates 92A to 92E. The heat reflecting plates 92A to 92E are supported by 94A to 94E, respectively.
- each of the support rods 94A to 94E is formed in a pipe shape (cylindrical shape), and the corresponding heat reflecting plates 92A to 92E to be supported on the upper end portions thereof are fixed by welding or the like.
- the power feeding rods 82A to 82E are inserted into the pipe-shaped support rods 94A to 94E, respectively.
- the heat reflecting plates 92A to 92E are formed with insertion holes 96 through which the support rods 94A to 94E or the power feeding rods 82A to 82E are inserted. These insertion holes 96 have a small diameter at a portion where only the power feeding rods 82A to 82E are inserted, and a large diameter at a portion where each of the support rods 94A to 94E is inserted.
- Each of the heat reflecting plates 92A to 92E is also formed with a thermocouple insertion hole 98 for inserting a rod-shaped thermocouple (not shown) (see FIG. 5). The diameters of the thermocouple insertion holes 98 are all the same.
- each of the pipe-like support bars 94A to 94E is made of a metal or a ceramic material.
- each of the power feed bars 82A inserted through them. Sufficient space should be secured so as not to cause a short circuit with -82E.
- the metal of each of the power supply rods 82A to 82E the same material as that of the heat reflecting plates 92A to 92E can be used.
- an inert gas such as N 2 is introduced into the cylindrical support 54 formed as described above by the inert gas supply unit 100 to oxidize each metal surface. It comes to prevent.
- a rare gas such as Ar can be used in addition to the N 2 gas.
- the unprocessed semiconductor wafer W is loaded into the processing container 22 through the gate valve 34 and the loading / unloading port 32 that are opened by being held by a transfer arm (not shown). After the semiconductor wafer W is transferred to the raised lift pins 60, the lift pins 60 are lowered to place the semiconductor wafer W on the upper surface of the mounting table 52 of the mounting table structure 50. To support.
- a film forming gas is supplied to the shower head 38 as various processing gases while controlling the flow rate, and this gas is injected from the gas injection holes 44 and introduced into the processing space S.
- the vacuum pump provided in the exhaust pipe 30 is continuously driven to evacuate the atmosphere in the processing container 22 and the exhaust space 24 and adjust the valve opening of the pressure regulating valve.
- the atmosphere of the processing space S is maintained at a predetermined process pressure.
- the temperature of the semiconductor wafer W is maintained at a predetermined process temperature. That is, by applying a voltage from the heater power supply 86 to the heater section 78 of the mounting table 52 via the power supply rods 82A to 82D, the heating heater section 78 is heated, whereby the entire mounting table 52 is heated.
- the semiconductor wafer W mounted on the mounting table 52 is heated and heated.
- the temperature of the semiconductor wafer is measured by a thermocouple (not shown) provided on the mounting table 52, and the temperature is controlled based on the measured value.
- a high frequency power source 48 is driven to apply a high frequency between the shower head 38 as the upper electrode and the mounting table 52 as the lower electrode, thereby generating plasma in the processing space S. Stand up.
- a voltage is applied to the chuck electrode 76 forming the electrostatic chuck, and the semiconductor wafer W is attracted by electrostatic force.
- a predetermined plasma process is performed in this state.
- plasma ions can be attracted by applying a high frequency to the chuck electrode 76 of the mounting table 52 from a high frequency power supply 90 for bias.
- each of the heat reflecting plates 92A to 92E is very thin and has a small heat capacity, so that the mounting table 52 is not thermally adversely affected.
- the distance between the lower surface of the mounting table 52 and the heat reflecting plates 92A to 92E is preferably as short as possible.
- the distance between the lower surface of the mounting table 52 and the uppermost heat reflecting plate 92E is 5 mm. It is better to set within.
- the number of the heat reflecting plates 92A to 92E is not particularly limited, but is preferably in the range of about 1 to 5 in consideration of the overall heat capacity and the reflection effect of radiant heat.
- the inside of the cylindrical support 54 is in an atmosphere of an inert gas such as N 2 gas, it is possible to prevent the power feeding rods 82A to 82E from being corroded, as well as the metal plate. It is possible to prevent the heat reflecting plates 92A to 92E from being corroded.
- an inert gas such as N 2 gas
- the upper portion of the cylindrical column 54 that supports the mounting table 52 is brought close to the lower surface of the mounting table 52, for example, heat reflection. Since the heat reflecting portion 56 having the plates 92A to 92E is provided, the radiant heat radiated from the lower surface of the central portion of the mounting table 52 can be reflected by the heat reflecting portion 56 and returned. As a result, it is possible to prevent the cool spot from being generated at the central portion of the mounting table 52 and to prevent the mounting table itself from being damaged, and to perform an in-plane heat treatment on the semiconductor wafer W that is the object to be processed. Uniformity can be improved.
- FIG. 6 is a graph showing the relationship between the wavelength of heat rays (light) and the emissivity / absorption rate.
- the wavelength of the near-infrared region that forms the radiant heat is in the range of about 0.7 to 4 ⁇ m. Within this range, ceramic materials and plastics have high emissivity and absorptance, whereas metals have relatively low emissivity and absorptance and reflect a large amount of radiant heat. It can be understood that a metal is preferable as the material.
- the radiant energy E of the mounting table 52 is as follows.
- T1 Temperature of the mounting table 52
- T2 Temperature of the heat reflecting portion (heat reflecting plate) 56
- the amount of heat transferred from the mounting table 52 (radiant energy f ⁇ ) is 4.9 W (watts) when the temperature of the heat reflecting portion is 600 ° C., 9.4 W when the temperature is 500 ° C., It was 12.4W at 400 ° C and 14.4W at 300 ° C. On the other hand, in the conventional mounting table structure, it was 76.1W.
- the mounting table structure of the present invention compared with the conventional mounting table structure, according to the mounting table structure of the present invention, the amount of heat transfer that escapes from the mounting table 52 to the column 54 side in the entire temperature range of 300 to 600 ° C. is suppressed. You can understand that you can.
- FIG. 7 is an enlarged sectional view showing the structure of the first modified embodiment of the heat reflecting portion.
- the same components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals, and the description thereof is omitted.
- each of the heat reflecting plates 92A to 92E forming the heat reflecting portion 56 is formed of a metal plate, but it may be formed of a heat insulating plate and a heat reflecting layer. That is, as shown in FIG. 7, here, the heat reflecting plate 92A is constituted by a thin heat insulating plate 102 and a heat reflecting layer 104 provided on the upper surface side of the heat insulating plate 102.
- FIG. 7 representatively shows one heat reflecting plate 92A, but the other heat reflecting plates 92B to 92E have the same configuration.
- the heat insulating plate 102 for example, a thin plate-shaped ceramic material can be used.
- a thin metal layer can be used as the heat reflecting layer 104, and the metal layer is selected from the same material as the metal plate described above, for example, a group consisting of copper, aluminum, aluminum alloy, gold, and stainless steel. One material can be used.
- Such a metal layer can be formed on the surface of the heat insulating plate 102 made of a plate-shaped ceramic material by using, for example, plating or sputtering. According to this, radiant heat can be reflected while suppressing heat conduction from the mounting table 52. Also in this case, the same effect as the embodiment described above with reference to FIGS. 1 to 6 can be exhibited.
- FIG. 8 is a view showing the structure of the second modified embodiment of the heat reflecting portion.
- one heat reflecting plate is supported by one support rod.
- the present invention is not limited to this, and a plurality of heat reflecting plates may be supported by one support rod.
- the five heat reflecting plates 92A to 92E forming the heat reflecting portion 56 are supported by one pipe-like support bar 94.
- any one of the five power supply rods 82A to 82E is inserted into the pipe-shaped support rod 94. Also in this case, the same effects as those of the embodiment described above with reference to FIGS. 1 to 6 can be exhibited, and the number of support bars 94 can be reduced.
- pipe-like (hollow) support rods are used as the support rods 94, 94A to 94E.
- the present invention is not limited to this, and support rods filled in the interior may be used.
- the heat reflecting plates 92A to 92E forming the heat reflecting portion 56 are supported by the support rods 94A to 94E.
- the present invention is not limited to this.
- a plurality of support pins 110A to 110E made of, for example, ceramic material are inserted in a plurality of stages from the outer surface of the support 54 to the inside.
- the peripheral portions of the heat reflecting plates 92A to 92E may be placed on and supported by the tip portions of the support pins 110A to 110E. Also in this case, the same effects as those of the embodiment described above with reference to FIGS. 1 to 6 can be exhibited, and the number of support bars 94 can be reduced.
- a ceramic material can be used for the support rods 94, 94A to 94E, the heat insulating plate 102, and the like.
- the ceramic material include alumina (Al 2 O 3 ), aluminum nitride (AlN), silicon
- alumina Al 2 O 3
- AlN aluminum nitride
- SiC carbide
- SiN silicon nitride
- the film forming process using plasma has been described as an example.
- the present invention is not limited thereto, and the film forming process by thermal CVD without using plasma, the thermal diffusion process, the reforming process, the crystallization process, The present invention can be applied to all other heat treatments such as etching treatment.
- the heating means 78 is embedded in the mounting table 52
- the present invention is not limited to this.
- a heating lamp is used as the heating means 78 and the heating lamp is opposed to the mounting table 52. You may make it provide in the ceiling part of the container 22.
- the gas introducing means 38 is not a shower head, but a gas nozzle or the like provided through the side wall of the processing container 22.
- the semiconductor wafer is described as an example of the object to be processed, but the present invention is not limited to this, and the present invention can be applied to a glass substrate, an LCD substrate, a ceramic material substrate, and the like.
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Abstract
Description
また例えば、前記熱反射板は、断熱板と、該断熱板の上面側に設けた熱反射層とよりなる。
また例えば、前記熱反射板は、金属板、或いは金属層を含む。
また例えば、前記断熱板は、セラミック材よりなる。
また例えば、前記熱反射部は、前記処理容器の底部から起立された支持棒により支持されている。
また例えば、前記載置台には、載置台電極が設けられると共に、前記支柱内には前記載置台電極に対して給電を行う給電棒が設けられ、前記支持棒はパイプ状になされており、前記支持棒内に前記給電棒が挿通されている。
また例えば、前記熱反射部は、前記支柱の内壁に支持されている。
熱処理装置の処理容器内に設けた載置台構造において、載置台を支持する筒体状の支柱内の上部に、載置台の下面に接近させて熱反射部を設けるようにしたので、載置台の中心部の下面から放射される輻射熱を上記熱反射部により反射させて戻すことができる。この結果、載置台の中心部にクールスポットが発生することを阻止して、この載置台自体が破損することを防止することができると共に、被処理体に対する熱処理の面内均一性を高めることができる。
図1は本発明に係る載置台構造を用いた熱処理装置を示す構成図、図2は載置台構造の一部を模式的に示す部分拡大斜視図、図3は載置台構造を模式的に示す断面図、図4は載置台と支柱との接合部を模式的に示す拡大断面図、図5は熱反射板を支持する支持棒の一例を示す分解斜視図である。
まず、未処理の半導体ウエハWは、図示しない搬送アームに保持されて開状態となったゲートバルブ34、搬出入口32を介して処理容器22内へ搬入される。この半導体ウエハWは、上昇された昇降ピン60に受け渡された後に、この昇降ピン60を降下させることにより、半導体ウエハWを載置台構造50の載置台52の上面に載置してこれを支持する。
ここで上記熱反射板92A~92Eの構成材料について検討を行ったので、その評価結果について説明する。上記熱反射板92A~92Eの材料として金属、セラミック材、プラスチックについて検討を行った。その結果を図6に示す。図6は熱線(光)の波長と放射率・吸収率との関係を示すグラフである。
次に、載置台52から支柱54内に対する熱放射量(熱エネルギー)についてシミュレーションによって評価を行ったので、その評価結果について説明する。
ここでは載置台52として窒化アルミニウム(AlN)を用い、熱反射部56として1枚の銅製の熱反射板を用いた。載置台52の温度は680℃(=953K)に設定し、熱反射板の温度に関して600℃、500℃、400℃、300℃の4種類の温度について検討した。
fε=1/((1/ε1)+(1/ε2)-1=0.20
ε1:載置台52の放射率(=0.9)
ε2:熱反射板の放射率(=0.2)
尚、載置台52の有効面積は”0.00180864m2”である。
E=fε・σ・(T1-4-T2-4)
σ:ステファンボルツマン定数(=5.67×10-8W/m2・K4)
T1:載置台52の温度
T2:熱反射部(熱反射板)56の温度
次に、上記熱反射部56の変形実施形態について説明する。図7は熱反射部の第1の変形実施形態の構造を示す拡大断面図である。尚、図1乃至図6に示す構成部分と同一構成部分については同一参照符号を付して、その説明を省略する。
Claims (12)
- 熱処理装置の処理容器内に設けられて、熱処理すべき被処理体を載置するための載置台構造において、
前記被処理体を載置するための載置台と、
前記載置台の下面の中心部に連結されて前記載置台を支持する筒体状の支柱と、
前記支柱内の上部に、前記載置台の下面に接近させて設けた熱反射部と、
を備えたことを特徴とする載置台構造。 - 前記熱反射部は、1枚、或いは複数段に亘って配置された複数枚の熱反射板よりなることを特徴とする請求項1記載の載置台構造。
- 各熱反射板は、断熱板と、該断熱板の上面側に設けた熱反射層とよりなることを特徴とする請求項2記載の載置台構造。
- 前記熱反射板は、金属板、或いは金属層を含むことを特徴とする請求項3記載の載置台構造。
- 前記金属板は、銅、アルミニウム、アルミニウム合金、金、ステンレスよりなる群から選択される1の材料よりなることを特徴とする請求項4記載の載置台構造。
- 前記断熱板は、セラミック材よりなることを特徴とする請求項3記載の載置台構造。
- 前記熱反射部は、前記処理容器の底部から起立された支持棒により支持されていることを特徴とする請求項1記載の載置台構造。
- 前記載置台には、前記被処理体を加熱する加熱手段が設けられ、前記支柱内には前記加熱手段に対して給電を行う給電棒が設けられ、前記支持棒はパイプ状になされており、前記支持棒内に前記給電棒が挿通されていることを特徴とする請求項7記載の載置台構造。
- 前記載置台には、載置台電極が設けられ、前記支柱内には前記載置台電極に対して給電を行う給電棒が設けられ、前記支持棒はパイプ状になされており、前記支持棒内に前記給電棒が挿通されていることを特徴とする請求項7記載の載置台構造。
- 前記支持棒は、金属、或いはセラミック材よりなることを特徴とする請求項7記載の載置台構造。
- 前記熱反射部は、前記支柱の内壁に支持されていることを特徴とする請求項1記載の載置台構造。
- 被処理体に対して所定の熱処理を施すための熱処理装置において、
排気可能になされた処理容器と、
前記処理容器内で前記被処理体を載置するために設けられた載置台構造と、
前記被処理体を加熱するための加熱手段と、
前記処理容器内へガスを導入するためのガス導入手段と、
を備え、
前記載置構造は、
前記被処理体を載置するための載置台と、
前記載置台の下面の中心部に連結されて前記載置台を支持する筒体状の支柱と、
前記支柱内の上部に、前記載置台の下面に接近させて設けた熱反射部と、
を備えたことを特徴とする熱処理装置。
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2009
- 2009-03-13 CN CN2009801007683A patent/CN101903980B/zh not_active Expired - Fee Related
- 2009-03-13 US US12/918,244 patent/US20100323313A1/en not_active Abandoned
- 2009-03-13 WO PCT/JP2009/054937 patent/WO2009116472A1/ja active Application Filing
- 2009-03-13 KR KR1020107003734A patent/KR20100126256A/ko not_active Application Discontinuation
- 2009-03-20 TW TW098109189A patent/TW200952111A/zh unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH01110724A (ja) * | 1987-07-31 | 1989-04-27 | Tokyo Electron Ltd | 加熱炉 |
JPH03148816A (ja) * | 1989-11-06 | 1991-06-25 | Fujitsu Ltd | 有機金属気相成長装置 |
JPH0722501A (ja) * | 1993-06-29 | 1995-01-24 | Tokyo Electron Ltd | 処理装置 |
JPH10326788A (ja) * | 1997-05-26 | 1998-12-08 | Kokusai Electric Co Ltd | ヒータユニット及び基板処理装置 |
JP2004022688A (ja) * | 2002-06-14 | 2004-01-22 | Epiquest:Kk | SiCウエハー酸化装置 |
WO2007055381A1 (ja) * | 2005-11-14 | 2007-05-18 | Tokyo Electron Limited | 成膜装置および成膜装置用の載置台 |
Also Published As
Publication number | Publication date |
---|---|
TW200952111A (en) | 2009-12-16 |
JP2009231401A (ja) | 2009-10-08 |
KR20100126256A (ko) | 2010-12-01 |
CN101903980A (zh) | 2010-12-01 |
CN101903980B (zh) | 2012-10-10 |
US20100323313A1 (en) | 2010-12-23 |
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