WO2003073487A1 - Systeme de traitement thermique - Google Patents
Systeme de traitement thermique Download PDFInfo
- Publication number
- WO2003073487A1 WO2003073487A1 PCT/JP2002/012280 JP0212280W WO03073487A1 WO 2003073487 A1 WO2003073487 A1 WO 2003073487A1 JP 0212280 W JP0212280 W JP 0212280W WO 03073487 A1 WO03073487 A1 WO 03073487A1
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- WO
- WIPO (PCT)
- Prior art keywords
- heat treatment
- treatment apparatus
- processing container
- processing
- heat
- Prior art date
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 109
- 238000001816 cooling Methods 0.000 claims abstract description 58
- 239000007789 gas Substances 0.000 claims description 43
- 239000000112 cooling gas Substances 0.000 claims description 33
- 239000003507 refrigerant Substances 0.000 claims description 17
- 239000010453 quartz Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 5
- 238000011946 reduction process Methods 0.000 claims description 4
- 235000012431 wafers Nutrition 0.000 description 129
- 238000000034 method Methods 0.000 description 32
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- 239000004065 semiconductor Substances 0.000 description 15
- 239000000498 cooling water Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 238000011156 evaluation Methods 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
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- 238000011109 contamination Methods 0.000 description 4
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
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- 238000007747 plating Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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- 238000002310 reflectometry Methods 0.000 description 1
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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
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67109—Apparatus for thermal treatment mainly by convection
Definitions
- the present invention relates to a heat treatment apparatus that performs a predetermined process at a relatively low temperature on an object such as a semiconductor wafer. Background technology
- various heat treatments such as a film formation process, an etching process, an oxidation process, a diffusion process, and a reforming process are performed on a semiconductor wafer formed of a silicon substrate or the like.
- These heat treatments can be performed in a vertical, so-called batch type heat treatment apparatus.
- a semiconductor wafer is transferred to a vertical wafer port from a cassette capable of accommodating a plurality of semiconductor wafers, for example, about 25 wafers.
- On the wafer boat for example, about 30 to 150 wafers are mounted in multiple stages (depending on the wafer size).
- the wafer boat is loaded (loaded) from below into a evacuable processing container.
- the inside of the processing vessel is maintained in an airtight state, and a predetermined heat treatment is performed while controlling various process conditions such as a flow rate of a processing gas, a process pressure, and a process temperature.
- the heat treatment apparatus 2 has a vertical processing vessel 8 having a double-quartz structure made of quartz and having an inner cylinder 4 and an outer cylinder 6.
- the processing space S in the inner cylinder 4 accommodates a wafer boat 10 made of quartz as an object holder for holding an object to be processed.
- a semiconductor wafer W as an object to be processed is held in multiple stages at a predetermined pitch.
- a cap 12 is provided to open and close the lower part of the processing container 8.
- the above wafer boat 10 is placed on the heat retaining cylinder 20 Have been.
- the cap 12 is attached to an arm 24 of a boat elevator 22 that can be moved up and down, and can be moved up and down integrally with the rotating shaft 16 and the wafer boat 10.
- the wafer boat 10 can be inserted into and removed from the processing container 8 via the bottom of the processing container 8 by the vertical movement by the boat elevator 22.
- a manifold 26 made of, for example, stainless steel is joined to the lower end opening of the processing container 8.
- the manifold 26 has a plurality of (two in the illustrated example) gas nozzles 28 A and 28 B for introducing various processing gases required for heat treatment, for example, film formation into the processing vessel 8. Is penetrating.
- a gas supply system 30 A, 30 B is connected to each gas nozzle 28 A, 28 B, respectively.
- Each gas supply system 30 A, 30 B is provided with a flow controller 3 such as a mass flow controller for controlling a gas flow rate.
- each processing gas supplied from each of the gas nozzles 28 A and 28 B rises in the processing space S (wafer accommodating area) in the inner cylinder 4, and turns back downward at the ceiling portion. It flows down in the gap between the and the outer cylinder 6.
- An exhaust port communicating with the gap between the inner cylinder 4 and the outer cylinder 6 is provided on the side wall of the manifold 26.
- a vacuum pump or the like (not shown) is connected to the exhaust port 34.
- the inside of the processing container 8 can be evacuated.
- a heat insulating layer 36 made of a heat insulating material is provided on the outer periphery of the processing container 8. Inside the heat insulation layer 36, a heating heater 38 as a heating means is provided. As a result, the wafer W located inside the processing container 8 is heated to a predetermined temperature.
- the conventional heat treatment apparatus 2 as described above is designed on the premise that heat treatment in a relatively high temperature range of, for example, about 900 to 1200 ° C., such as film formation processing and oxidation diffusion processing, is performed. I have. From the viewpoint of the thermal stability in the high temperature range as described above, the heat insulating layer 36 is configured to be relatively thick and to have a large heat capacity. In addition, a heat treatment apparatus has been proposed in which cooling air is blown to the outside of a processing container in order to rapidly lower the temperature of a processed wafer (for example, Japanese Patent Application Laid-Open No. 2000-01081). No. 2 publication).
- the semiconductor wafer must be heat-treated in a relatively low temperature range of, for example, about 50 to 600 ° C. instead of the high temperature range.
- a copper film such as a metal plating, must be formed on a wafer by 50 to 100 mm. It may be necessary to perform annealing at a low temperature of about 150 ° C.
- a heat treatment device 2 having a large heat capacity designed for a high-temperature region of, for example, about 900 to 1200 ° C. as shown in FIG. 6 is used.
- the heat treatment is performed at a low temperature, it takes a very long time to lower the wafer temperature to a handling temperature of about room temperature.
- the temperature drop rate in a high temperature range of about 900 to 1200 ° C is as large as about 5 to 6111111.
- the rate of temperature decrease in the low temperature range around 100 ° C is very small, for example, about 1-2 ° C / min. Such a phenomenon in the low temperature range is similarly observed in a case where the cooling air is blown to the side wall of the processing container 8.
- An object of the present invention is to provide a heat treatment apparatus which has a high cooling rate in a low temperature range of, for example, about 50 to 600 ° C. and can improve the heat treatment throughput.
- the present invention provides a cylindrical processing container, a plurality of processing objects to be held in multiple stages, and a processing object holding means that can be inserted into and removed from the processing container, and a predetermined processing gas is introduced into the processing container.
- a plurality of processing objects that are provided inside the processing container and are held by the processing object holding unit when the processing object holding unit is inserted into the processing container.
- Heating means for heating the outer wall of the processing vessel A heat treatment apparatus comprising: a container cooling unit.
- the outer wall surface of the processing vessel is cooled by the vessel cooling means, so that the heat capacity of the entire heat treatment apparatus is reduced.
- the rate of temperature reduction (temperature reduction rate) of the object in the low temperature range can be significantly improved. Therefore, the throughput of the heat treatment of the object can be improved accordingly.
- the container cooling means includes: a cooling pipe arranged to be in contact with an outer wall surface of the processing container; and a refrigerant introducing means for flowing a coolant into the cooling pipe.
- the outer wall surface of the processing container can be efficiently cooled by the solvent.
- the cooling pipe is wound around an outer wall surface of the processing container.
- the cooling pipe may have a double pipe structure having an inner pipe and an outer pipe, and the refrigerant may flow between the inner pipe and the outer pipe.
- an outer wall surface of the processing container and the cooling pipe are covered with a heat transfer material.
- the heat transfer area can be increased, the heat exchange efficiency can be improved, and the cooling rate can be improved.
- the heat transfer material is, for example, heat transfer cement.
- a cooling gas introducing means for introducing a predetermined cooling gas into the processing container when the temperature of the object to be processed is lowered is provided.
- the cooling gas can be directly introduced into the processing vessel by the cooling gas introduction means, the cooling rate (cooling rate) and the cooling characteristic in the low temperature range can be further improved.
- the inner wall surface of the processing container may be subjected to a heat reflectance lowering process for lowering the heat reflectance of the inner wall surface.
- a heat reflectance lowering process for lowering the heat reflectance of the inner wall surface.
- the heating means has side portions extending vertically along the inner wall surface of the processing container.
- the lower part of the side heater may be supported on the bottom side of the processing vessel, but the upper part of the side heater is supported on the ceiling side of the processing vessel. preferable.
- There is relatively room on the ceiling side of the processing vessel This is because it is possible to avoid concentration of piping in the lower part of the processing vessel where the arrangement of other piping, such as processing gas introducing means and cooling gas introducing means, tends to be concentrated. In this case, the maintainability of the lower part of the processing container can be improved.
- the heating unit includes a ceiling heater that is disposed near a ceiling of the object holding unit inserted into the processing container and heats the ceiling.
- the heating means has a bottom portion which is disposed near a bottom portion of the object holding means inserted into the processing container and heats the bottom portion.
- the ceiling part is supported by a ceiling part of the processing container.
- the bottom portion is also supported by the ceiling of the processing container.
- the bottom heat sink may be supported by the lid member.
- the processing container is preferably made of quartz, stainless steel, or aluminum.
- the object to be processed is heated within a range of 50 ° C. to 600 ° C.
- FIG. 1 is a schematic configuration diagram showing a first embodiment of a heat treatment apparatus according to the present invention.
- FIG. 2 is a cross-sectional view of the heat treatment apparatus of the present embodiment.
- FIG. 3 is a perspective view of a heating rod as a heating means.
- FIGS. 4 (A) and 4 (B) are graphs showing examples of the temperature drop characteristics of the wafer by the heat treatment apparatus according to the first embodiment of the present invention.
- FIG. 5 is a graph showing the wafer temperature when the temperature is raised.
- FIG. 6 is a schematic configuration diagram showing a second embodiment of the heat treatment apparatus according to the present invention.
- FIGS. 7 (A) and 7 (B) are plan views showing examples of the shape of the ceiling part and the bottom part.
- FIG. 8 is a graph showing a temperature rise characteristic of a wafer by a conventional apparatus.
- FIG. 9 is a graph showing a wafer temperature rise characteristic by the heat treatment apparatus according to the second embodiment of the present invention.
- FIG. 10 is a schematic configuration diagram illustrating an example of a conventional heat treatment apparatus. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a schematic configuration diagram illustrating a first embodiment of a heat treatment apparatus according to the present invention
- FIG. 2 is a cross-sectional view of the heat treatment apparatus according to the present embodiment
- FIG. It is a perspective view.
- the heat treatment apparatus 40 has a cylindrical processing vessel 42 whose lower end is open.
- the processing container 42 can be formed of a metal such as stainless steel or aluminum, for example, in addition to quartz.
- the processing vessel 4 When quartz is used as the material for heat resistance and has high heat resistance, and semiconductor wafers are processed mainly in the low temperature region of about 50 to 350 ° C, stainless steel is used as the material for the processing vessel 42. It is preferable to use a metal such as aluminum.
- An open exhaust port 46 is provided on the ceiling of the processing container 42.
- An exhaust nozzle 48 that is bent at right angles in the horizontal direction is continuously provided to the exhaust port 46.
- An exhaust system 54 in which a pressure control valve 50, an exhaust pump 52, and the like are interposed is connected to the exhaust nozzle 48. Thereby, the atmosphere in the processing container 42 can be exhausted.
- the inside of the processing container 42 can be made into a vacuum atmosphere or an atmosphere of approximately normal pressure depending on the processing mode.
- the lower end of the processing container 42 is supported by a cylindrical manifold 56 made of, for example, stainless steel.
- a large number of A quartz wafer boat 58 as a processing object holding means on which semiconductor wafers W as physical bodies are mounted in multiple stages is provided so as to be able to move up and down.
- the wafer boat 58 is removable from below the manifold 56 into the processing vessel 42.
- a Seal member 57 such as an O-ring is interposed between the lower end of the container 42 and the upper end of the manifold 56. Thereby, the airtightness between the processing container 42 and the manifold 56 is maintained.
- the wafer boat 58 is placed on a table 62 via a heat insulating tube 60 made of quartz.
- the table 62 is supported on a rotating shaft 66 that penetrates a lid 64 that opens and closes a lower end opening of the manifold 56.
- a magnetic fluid seal 68 is provided at a portion of the rotary shaft 66 that penetrates the lid portion 64.
- the rotating shaft 66 can rotate while maintaining the airtightness of the lid portion 64.
- a seal member 70 made up of, for example, an O-ring is provided between the peripheral portion of the lid portion 64 and the lower end portion of the manifold 56. Thereby, the airtightness between the lid portion 64 and the manifold 56 is maintained, and the airtightness inside the processing container 42 is maintained.
- the rotating shaft 66 is attached to the tip of an arm 74 supported by a lifting mechanism 72 such as a boat elevator. With the elevating operation of the elevating mechanism 72, the wafer boat 58, the lid 64, and the like can be integrally moved up and down.
- a lifting mechanism 72 such as a boat elevator.
- the table 62 may be fixed on the lid 64. In this case, the wafer W is processed without rotating the wafer boat 58.
- One of the cooling gas introduction means 80 is provided.
- the heating means 76 has a vertically long heat sink bar 82 whose upper part is bent in a U-shape.
- a plurality of heat sink bars 82 are provided substantially evenly in the circumferential direction of the processing container 42, and in the case shown in FIG. Of course, the number of heat sink bars is not limited.
- the length of the heating rod 82 is longer than the height of the wafer boat 58.
- Each heat sink bar 8 2 is processed It is arranged along the inner wall surface of the container 42 and at a small distance from the inner wall surface.
- the lower end portion 82 A of the heat sink bar 82 is bent at a substantially right angle into an L shape.
- the lower end 82 A is fixed to the manifold 56. As a result, the entire heat sink bar 82 is supported.
- the heat sink bar 82 for example, a carbon wire heater or the like in which the periphery of a carbon wire is covered with a quartz layer can be used.
- Each of the heater rods 82 is connected to a heater power supply 86 via a switch mechanism 84 by a power supply line 83.
- the processing gas introduction means 78 has a plurality of processing gas nozzles 88 A and 88 B penetrating the manifold 56, and two processing gas nozzles in the illustrated example.
- the processing gas nozzles 88 A and 88 B are connected to processing gas sources 92 A and 92 B via processing gas lines 90 A and 90 B, respectively.
- On / off valves 94 A, 94 B and flow controllers 96 A, 96 B such as a mass flow controller are interposed in the respective processing gas lines 90 A, 90 B, respectively.
- the required number of the processing gas nozzles 88 A, 88 B, etc. are provided according to the number of required gas types.
- the tip of each processing gas nozzle 88A, 88B is bent upward.
- the cooling gas introduction means 80 has a plurality of cooling gas nozzles 98 that penetrate the manifold 56, in the illustrated example, eight cooling gas nozzles 98. These gas nozzles 98 are arranged substantially evenly (in a substantially equal pitch) in the circumferential direction of the manifold 56. The tip of each cooling gas nozzle 98 is bent upward. Each cooling gas nozzle 98 is connected to a cooling gas source 104 via a cooling gas line 100 in which an on-off valve 102 is provided on the way. As will be described later, a cooling gas is injected from each cooling gas nozzle 98 into the processing vessel 42 in order to lower the temperature of the wafer after the heat treatment.
- an inert gas such as N 2 gas, Ar gas, He gas, or clean air may be used. Further, if a cooling mechanism (not shown) is provided in the cooling gas line 100 so that the cooling gas is cooled to a lower temperature and then jetted, the temperature reduction rate of the wafer can be further increased.
- the processing container 42 is provided with a container cooling means 110 for cooling the processing container 42 itself.
- the container cooling means of the present embodiment t 10
- a cooling pipe 111 is wound in close contact with the outer wall surface of the physical container 42 in a spiral shape.
- the cooling pipe 112 is made of a material having good heat conductivity such as copper, for example, and is wound over substantially the entire height of the processing container 42.
- the refrigerant introduction port 112A is connected to a refrigerant source 114 through a refrigerant passage 118 in which an on-off valve 116 is provided on the way.
- the refrigerant for example, cooling water can be used, but it is not particularly limited to this.
- the refrigerant is preferably used repeatedly, for example, using a circulation passage.
- a heat transfer cement material 120 having a predetermined thickness and good heat conductivity is attached to the outer wall surface of the processing container 42 so as to embed the cooling pipe 112. . Thereby, when necessary, the side wall of the processing container 42 can be cooled more efficiently.
- the processing container 42 When the heat treatment apparatus is in a standby state while the semiconductor wafer W is in the unloaded state, the processing container 42 is maintained at a temperature lower than the process temperature, for example, about 50 ° C. Then, a wafer boat 58 on which a large number of normal-temperature wafers W, for example, 30 wafers W are mounted, is loaded into the processing container 42 from the lower side thereof. By closing the lower end opening of the manifold 56 with the lid portion 64, the inside of the processing container 42 is sealed.
- the inside of the processing container 42 is evacuated and maintained at a predetermined process pressure, for example, about 10 OPa.
- a predetermined process pressure for example, about 10 OPa.
- the wafer temperature is raised to the process temperature for the anneal, for example, about 150 ° C., and stabilized.
- H 2 gas as a predetermined processing gas is supplied from one processing gas nozzle (for example, 88 A) of the processing gas introduction means 78 while controlling the flow rate thereof.
- the H 2 gas comes into contact with the wafer W stored in the rotating wafer boat 58 while rising inside the processing container 42. As a result, the copper film on the wafer surface becomes anneal ' It is processed. Then, the H 2 gas is exhausted out of the system from an exhaust port 46 at the ceiling of the processing container 42.
- a coolant such as cooling water can flow through the cooling pipe 1 12 of the vessel cooling means 110 provided on the side wall of the processing vessel 42.
- the container side wall can be cooled. If a coolant such as cooling water is not flowed, the thermal efficiency of the treatment can be increased.
- the power supplied to the heating rod 82 is controlled or cut off, and then a cooling operation is performed.
- Refrigerant continues to flow into the cooling pipes 111 of the container cooling means 110 (when the refrigerant is not flowing during the heat treatment, the refrigerant starts to flow), and the side walls of the processing container 42 continue to be cooled. .
- the cooling gas for example, N 2 gas or clean air
- the cooling gas flows from each cooling gas nozzle 98 of the cooling gas introduction means 80. Is injected into the processing container 42. Thereby, the cooling of the wafer W is promoted.
- the side walls of the processing vessel 42 are directly cooled by flowing cooling water or the like through the cooling pipes 112, and the processing vessel 42 and the heat transfer cement material 1 2 Since the heat capacity of the entire heating furnace including 0 is small, the wafer W can be cooled efficiently, that is, the temperature reduction rate of the wafer W can be increased.
- the cooling pipes 112 are embedded by the heat transfer cement material 120, the heat transfer efficiency between the side wall of the processing vessel 42 and the cooling pipes 112 is greatly increased. Therefore, the temperature of the processing vessel 42 can be decreased more quickly, and at the same time as the cooling by the cooling pipes 112, cooling gas is introduced into the processing vessel 42 from below. The cooling gas directly cools the processed wafer W by directly contacting the processed wafer W. Therefore, the temperature of the wafer W can be reduced more quickly, that is, the temperature reduction rate of the wafer W can be increased.
- the heat absorption rate of the side wall of the processing container 42 increases. In this case, it is possible to lower the temperature in the processing container 42 and, consequently, the temperature of the wafer W more quickly. Become.
- the heat reflectivity lowering treatment there is a blackening treatment for the inner wall of the container, a treatment for roughening the surface of the inner wall of the container with sand blast or the like, and the like.
- a metal tube having a double-pipe structure may be used as the container cooling means 110, and a refrigerant may flow between these double pipes.
- the heat sink bar 82 is provided in the processing vessel 42, but the process temperature is low, the process is a treatment for annealing the copper film, and the surface of the heat sink bar 82 is covered with stone, etc. For this reason, there is no concern that the wafer will be contaminated with metal.
- FIG. 4 is a graph showing the temperature drop characteristics of the semiconductor wafer.
- Fig. 4 (A) shows the temperature drop characteristics when cooling water is flowing through the cooling pipe but no cooling gas is injected.
- Fig. 4 (B) shows the temperature drop characteristics when cooling water is flowing through the cooling pipe and cooling gas is also injected into the processing vessel.
- the flow rate of the cooling water was 5 liters Zmin, and the flow rate of the cooling gas was 666 liters / min using clean air.
- the temperature drop shows a relatively gentle curve. Nevertheless, the rate of temperature drop is higher in hot regions than in cold regions.
- the cooling rate is 5.9 ° C / min from 150 ° C to 100 ° C, and about 4.3 ° C / min from 150 ° C to 50 ° C.
- the cooling rate in this case is much larger than the cooling rate of 1-2 ° C./min in the conventional heat treatment apparatus shown in FIG. In other words, it was found that a sufficiently large cooling rate could be obtained without using cooling gas.
- Fig. 4 (B) when both the cooling gas and the refrigerant are used, the temperature drop shows a sharp curve.
- the degree of the temperature drop is very large.
- the cooling rate from 150 ° C to 100 ° C is 15.2 ° C / min, and from 150 ° C to 50 ° C is 11. l ° CZmin.
- a very high cooling rate can be obtained compared to the case shown in Fig. 4 (A). Revealed.
- the temperature of the processed wafer can be reduced more quickly, and accordingly, the throughput can be greatly improved.
- FIG. 5 is a graph showing evaluation results when the wafer temperature is raised.
- the line A indicates the set value from the computer of the temperature control system
- the curve B indicates the electric power supplied to the heating rod 82
- the curve C indicates the wafer temperature.
- the set temperature is 150 ° C and the flow rate of the cooling water is 5 liters / min.
- the wafer temperature is around 150 ° C, which is the set temperature (within 90%), about 3 minutes after the start of the temperature rise (within 10 minutes of the target value). Has been reached.
- the heating rate heating rate was sufficiently high and could be maintained at a value similar to that of the conventional apparatus.
- FIG. 6 is a schematic structural view showing a second embodiment of the heat treatment apparatus of the present invention
- FIGS. 7 (A) and 7 (B) are plan views showing the shapes of a ceiling part and a bottom part. It is a figure.
- the same components as those described with reference to FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.
- the constituent material of the processing container 42 is limited to metal, and the time until temperature stabilization is further reduced.
- the uniformity of the wafer surface temperature during the process is improved. That is, the processing container 42 of the present embodiment is formed of a metal material that does not cause metal contamination, for example, stainless steel or aluminum whose surface is anodized.
- the ceiling portion 42A of the processing container 42 and the lid portion 42B that opens and closes the lower end opening of the processing container 42 are also formed of the above-described metal material. At this time, the height and diameter of the processing container 42 are about 900 mm and about 500 mm, respectively. Therefore, the capacity of the processing container 42 is about 173 liters.
- the upper part of the rotating shaft 66 connected to 62 is formed of a heat-resistant material that is difficult to conduct heat, for example, quartz.
- the wafer W 58 supports, for example, a wafer W having a diameter of 300 mm.
- the heat retaining cylinder 60 (see FIG. 1) used in the first embodiment shown in FIG. 1 is not used.
- a plurality of types of heaters are used as heating means 76 in the present embodiment.
- a pear-skin pattern is attached to the heat-generating portion of the heat.
- a heating rod 82 similar to that shown in FIG. 3 is arranged vertically along the inner wall surface of the processing container 42.
- a large number of the heat sink bars 82 are arranged at predetermined intervals in the circumferential direction of the processing container 42, forming side heat sinks 130. I have. This is the same as the first embodiment described with reference to FIG. However, in the present embodiment, the bar 82 is not supported by the bottom side wall of the processing container 42, but is supported by the ceiling portion 42A of the processing container 42, as shown in FIG. Have been.
- the bottom heater 132 is disposed on the bottom side in the processing container 42, and the ceiling heater 134 is also disposed on the ceiling side.
- the bottom heater 13 2 is disposed below the rotating table 62 so as to face the rotating table 62 in parallel. As a result, a large amount of heat can be supplied to the lowermost wafer W among the wafers W stored in the wafer boat 58 in multiple stages.
- the ceiling part 134 is arranged so as to face in parallel with the upper end surface of the wafer boat 58. As a result, a large amount of heat can be supplied to the uppermost wafer W among the wafers W stored in the wafer boat 58 in multiple stages.
- the bottom heater 132 is supported and fixed to the lid 42B by a support post 1336 that also serves as a wiring, and is connected to a power supply 86 (see FIG. 1).
- the ceiling part 1 34 is supported and fixed to the ceiling part 42 A of the processing vessel 42 via a support column 1 38 which also serves as wiring, and is connected to the heating power supply 86.
- a flat heater plate having a circular donut shape can be used.
- the bottom part of the roof 13 and the ceiling part of the plane 13 are wire force—a flat light element that is bent in a meandering shape. May be configured by combining a plurality of sets (for example, three sets in the case of FIG. 7B).
- the surface of the wafer is coated with high-purity quartz, or the body of the wafer is placed in a quartz tube. It is configured to be accommodated.
- the bottom heater 13 for example, a resistance heating wire made of a high-purity carbon material as disclosed in Japanese Patent Publication No. 2001-156005 is used in the quartz plate. Can be used.
- the bottom heat sink 132 may be provided integrally with the rotating tape 62.
- the bottom and the Z or top of the wafer boat 58 where the amount of heat radiation tends to be larger than the central part Can increase the amount of heat input.
- the uniformity of the temperature between the surfaces of the wafers W mounted in multiple stages (for example, about 25 wafers) on the wafer boat 58 can be maintained at a high level.
- the auxiliary bottom heat sink 140 and / or the auxiliary ceiling heat sink 1 4 2 May be provided.
- Both the auxiliary bottom heater 140 and the auxiliary ceiling heater 142 can be fixed using the space above the processing vessel 42, which has sufficient space. That is, the upper ends of the heaters 140 and 142 can be supported and fixed to the container ceiling 42A. More specifically, the auxiliary bottom heater 140 is provided so that its heat-generating portion is provided along the lower inner wall surface in the processing vessel 42, and the auxiliary ceiling heater 140 is provided with its heat-generating portion. May be provided along the upper inner wall surface in the processing container 42. Thereby, the wafer W near the lowermost end and the wafer W near the uppermost end can be more strongly heated.
- the auxiliary bottom heater 140 and the auxiliary ceiling heater 140 are only those portions whose heat generating portions are described in a satin pattern.
- Other conductive parts are resistance values Has a small configuration. (For example, the resistance value is reduced by increasing its diameter.) This prevents heat from being generated from other conductive portions. It is preferable that the auxiliary bottom heater 140 and / or the auxiliary ceiling heater 142 be entirely covered with quartz cover or the like so as not to cause metal contamination on the wafer W.
- the inner wall surface of the processing container 42 may be subjected to a heat reflectance reduction process.
- a process of increasing the heat reflectance by an electropolishing process, a chrome plating process, or the like may be performed.
- the thermal stability is reduced by performing a heat reflection reduction process. It is effective to make the control of conversion easier.
- the process temperature is within the ordinary low temperature range of about 400 to 600 ° C, it is easy to control the temperature stabilization. It is effective to do so.
- the basic operation of the heat treatment apparatus of the present embodiment is substantially the same as the case of the first embodiment described above.
- a higher rate of temperature rise can be achieved.
- a maximum heating rate of 200 ° C./min can be obtained.
- a necessary small value can be obtained by suppressing the supplied power.
- the wafer temperature In a general processing apparatus in which the processing container 42 is not cooled, the wafer temperature is large. Overshoot, and it takes a long time to stabilize at the process temperature. In contrast, in the present embodiment, since the processing container 42 is cooled, the responsiveness of the temperature control is good, and the magnitude of the overshoot is suppressed. As a result, the wafer temperature can be stabilized at the process temperature in a shorter time.
- the bottom section 13 and the ceiling section 13 4, and if necessary, the auxiliary bottom section 1 40 and the auxiliary ceiling section 1 4 2 With this arrangement, the amount of heat supplied to the upper end and the lower end of the wafer boat 58, which tends to emit more heat than the center of the wafer boat 58, is increased. For this reason, the uniformity of the wafer temperature between the surfaces during the temperature rise and during the process can be increased. Therefore, it is possible to make the thermal histories of all the wafers W placed on the wafer boat 58 substantially the same.
- FIG. 8 is a graph showing the temperature rise characteristic of the wafer by the conventional apparatus
- FIG. 9 is a graph showing the temperature rise characteristic of the wafer by the heat treatment apparatus of the present embodiment.
- the set temperature was 150 ° C. for the conventional device and 100 ° C. for the device of the present embodiment.
- the lower limit of controllable temperature of the existing equipment 150 ° C, was set as the set temperature.
- the wafer size was 200 mm (8 inches) in the case of the conventional apparatus, and was 300 mm (12 inches) in the case of the apparatus of the present embodiment.
- the conventional apparatus accommodated 140 wafers, and the apparatus of the present embodiment accommodated 25 wafers.
- thermocouples are provided for the fourth wafer from the top as the top, the 70th wafer from the top as the sensor, and the 130th wafer from the top as the bottom, and these are provided.
- thermocouples are arranged on the first wafer from the top, the seventh wafer from the top, the 16th wafer from the top, and the 25th wafer from the top. It was provided and their temperatures were measured. Thermocouples were also installed at the center and the periphery of each of those wafers, and the temperature difference between the center and the periphery was measured.
- the process pressure was normal pressure
- the flow rate of the cooling water was 20 liter / min
- the flow rate of the N 2 gas at the time of cooling was 5 liter / min.
- the temperature of the wafer is set to 100 ° C. ⁇ 5 from the start of the temperature rise. It only took about 7 minutes to get into the range of C. In addition, it took about 5 minutes from the end of the temperature rise command to entering the temperature stable region. That is, it was found that the temperature of the wafer can be quickly raised to a predetermined process temperature. The heating rate at this time was 50 ° C / min.
- the reason why the process temperature is stabilized in only about 5 minutes after the end of the temperature increase command is that the wall surface of the processing vessel 42 is cooled by the cooling water even during the temperature increase, and the wafer is This is because the temperature overshoot can be suppressed and the temperature controllability is improved.
- the temperature difference between the surfaces of the wafer temperature when the temperature of the wafer is raised is at most a number. It was about C. In other words, wafer temperature uniformity between surfaces
- the temperature difference (in-plane temperature difference) between the central part and the peripheral part of the wafer when the wafer is heated is It increased to a maximum of about 15 ° C.
- the condition lasts for only a few minutes and has almost no adverse thermal effect on the wafer.
- the bottom heater 13 2 and the ceiling heater 13 4 etc. are provided in addition to the side heater 130 as in the second embodiment.
- the temperature uniformity between surfaces during processing can be greatly improved.
- the heat treatment is not particularly limited as long as the heat treatment does not cause metal contamination or the like.
- the process temperature is about 300 to 600 ° C., and NH 3 gas or the like is used as a processing gas.
- the object to be processed is not limited to a semiconductor wafer, and the present invention can be applied to a glass substrate, an LCD substrate, and the like.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02781837A EP1480262B1 (en) | 2002-02-28 | 2002-11-25 | Heat treatment system |
KR1020047009507A KR100910292B1 (ko) | 2002-02-28 | 2002-11-25 | 열 처리 장치 |
DE60239766T DE60239766D1 (de) | 2002-02-28 | 2002-11-25 | Wärmebehandlungssystem |
US10/505,863 US7102104B2 (en) | 2002-02-28 | 2002-11-25 | Heat treatment system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-54542 | 2002-02-28 | ||
JP2002054542 | 2002-02-28 | ||
JP2002200572A JP3912208B2 (ja) | 2002-02-28 | 2002-07-09 | 熱処理装置 |
JP2002-200572 | 2002-07-09 |
Publications (1)
Publication Number | Publication Date |
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WO2003073487A1 true WO2003073487A1 (fr) | 2003-09-04 |
Family
ID=27767205
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/012280 WO2003073487A1 (fr) | 2002-02-28 | 2002-11-25 | Systeme de traitement thermique |
Country Status (8)
Country | Link |
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US (1) | US7102104B2 (ja) |
EP (1) | EP1480262B1 (ja) |
JP (1) | JP3912208B2 (ja) |
KR (1) | KR100910292B1 (ja) |
CN (2) | CN2597491Y (ja) |
DE (1) | DE60239766D1 (ja) |
TW (1) | TWI244140B (ja) |
WO (1) | WO2003073487A1 (ja) |
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- 2002-07-09 JP JP2002200572A patent/JP3912208B2/ja not_active Expired - Fee Related
- 2002-11-25 TW TW091134189A patent/TWI244140B/zh not_active IP Right Cessation
- 2002-11-25 DE DE60239766T patent/DE60239766D1/de not_active Expired - Lifetime
- 2002-11-25 US US10/505,863 patent/US7102104B2/en not_active Expired - Fee Related
- 2002-11-25 KR KR1020047009507A patent/KR100910292B1/ko not_active IP Right Cessation
- 2002-11-25 EP EP02781837A patent/EP1480262B1/en not_active Expired - Fee Related
- 2002-11-25 WO PCT/JP2002/012280 patent/WO2003073487A1/ja active Application Filing
- 2002-11-25 CN CNU02295452XU patent/CN2597491Y/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
TW200303586A (en) | 2003-09-01 |
US7102104B2 (en) | 2006-09-05 |
KR100910292B1 (ko) | 2009-08-03 |
CN1309022C (zh) | 2007-04-04 |
EP1480262A4 (en) | 2006-12-06 |
CN1618118A (zh) | 2005-05-18 |
KR20040083069A (ko) | 2004-09-30 |
EP1480262B1 (en) | 2011-04-13 |
CN2597491Y (zh) | 2004-01-07 |
JP3912208B2 (ja) | 2007-05-09 |
TWI244140B (en) | 2005-11-21 |
US20050121432A1 (en) | 2005-06-09 |
EP1480262A1 (en) | 2004-11-24 |
DE60239766D1 (de) | 2011-05-26 |
JP2003324045A (ja) | 2003-11-14 |
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