WO2001041202A1 - Dispositif et procede de traitement thermique - Google Patents
Dispositif et procede de traitement thermique Download PDFInfo
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- WO2001041202A1 WO2001041202A1 PCT/JP2000/008401 JP0008401W WO0141202A1 WO 2001041202 A1 WO2001041202 A1 WO 2001041202A1 JP 0008401 W JP0008401 W JP 0008401W WO 0141202 A1 WO0141202 A1 WO 0141202A1
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- unit
- heat
- holder
- heat treatment
- temperature
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—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
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- 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
- C23C16/46—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 heating the substrate
Definitions
- the present invention relates to a heat treatment apparatus and a heat treatment method.
- a vertical heat treatment apparatus is known as one of the semiconductor depice manufacturing apparatuses.
- This heat treatment system is a batch type that heat treats a large number of wafers at once.
- Fig. 2 shows a schematic diagram of an apparatus for performing decompression CVD.
- Reference numeral 1 denotes a wafer boat.
- the wafer boat 1 holds a large number of wafers W in shelves, and a double-structured reaction tube 11 and a cylindrical manifold 1 It is carried into the reaction vessel consisting of 2.
- the reaction vessel is hermetically closed by the lid 10.
- the inside of the reaction vessel is heated to a predetermined temperature by a heater 13 surrounding the reaction tube 11, and is depressurized to a predetermined pressure by an exhaust pipe 14.
- the film forming gas is supplied from the lower side of the reaction vessel through the gas supply pipe 15, decomposed into thin film components and deposited on the wafer W, and the remaining gas flows from the ceiling of the inner pipe 1 la to the inner pipe 11. Descends the space between & and 1 lb of outer tube.
- an atmosphere in which the wafer W is placed is insulated from the outside of the lid 10 to keep the temperature under the wafer boat 1 by interposing a heat retaining unit 16 composed of, for example, fins made of quartz.
- a heat retaining unit 16 composed of, for example, fins made of quartz.
- the above-mentioned vertical heat treatment apparatus has the following problems.
- the heat capacity of the heat retaining unit 16 is set to be large in order to prevent the heat of the atmosphere in which the wafer W is placed from escaping to the outside as much as possible. Therefore, when the temperature of the processing atmosphere is raised to the target processing temperature to stabilize the temperature, the temperature rise of the heat retaining unit 16 is delayed, and the heat is transferred from the processing atmosphere to the heat retaining unit 16 side. Will flow. As a result, the time during which the temperature stabilizes (recovery time) is long, which causes a decrease in throughput. Further, unless a sufficiently long recovery time is taken, the reproducibility of each batch process is poor.
- this heat insulation unit 16 Since the surface area of the heat insulation unit 16 is large, this heat insulation unit 16 A large amount of water is brought into the reaction vessel through the reaction vessel, and this water is released from the heat retaining unit 16 during the heat treatment and is taken into the thin film formed on the wafer W, causing deterioration of the film quality. I have. Before the heat treatment, surface treatment may be performed by, for example, flowing hydrogen gas into the reaction vessel to remove impurities such as moisture attached to the wafer W. Since water is adsorbed on the wafer W, the efficiency of the surface treatment is low.
- the film forming gas introduced into the reaction vessel through the gas supply pipe 15 rises along the side of the heat retaining unit 16, but the gas temperature is particularly low because the temperature of the heat retaining unit 16 is low.
- the flow rate is large, the amount of unreacted gas that reaches the processing atmosphere in which the wafer W is placed increases. For this reason, the amount of gas decomposed in the processing atmosphere increases, and the amount of active species generated varies depending on the location. This is reflected in the film thickness of the wafer W, and between the wafers W and within the wafer W surface. This is one reason that the uniformity of the film thickness is deteriorated.
- the present invention has been made under such circumstances, and an object of the present invention is to provide a vertical heat treatment apparatus capable of improving throughput.
- the present invention includes a reaction container having an open lower end, a holder accommodated in the reaction container and holding a large number of objects to be processed, and a lid closing a lower end opening of the reaction container.
- a heat insulation unit is interposed between the heat insulation units, and the heat insulation unit has a heating element unit, and the heating element unit is configured by enclosing a resistance heating element with a small amount of metallic impurities in ceramic. Is a heat treatment apparatus.
- the heating unit is formed on at least the upper surface or the side surface of the heat retaining unit. 2.
- the present invention is the heat treatment apparatus according to claim 1, wherein the heat retention unit has a heat insulating fin located on the heating element unit side and a heat insulator located below the heat insulating fin.
- the present invention is the heat treatment apparatus, wherein the heat retaining unit has a plurality of heat insulating fins arranged in a horizontal direction.
- the present invention is characterized in that the heat retaining unit is fixed to the lid, a rotating shaft is connected to the holder, and the rotating shaft is connected to the drive unit through a through hole of the heat retaining unit. Heat treatment equipment.
- the present invention is characterized in that the rotating shaft includes a first rotating shaft that penetrates the through hole of the heat retaining unit, and a second rotating shaft that is connected to the first rotating shaft via a transmission unit and reaches the driving unit. Is a heat treatment apparatus.
- the second rotating shaft penetrates the lid, and the periphery of the second rotating shaft penetrating the lid on the heat retaining unit side is a lid-side projecting portion extending from the lid, and a transmitting portion extending from the transmitting portion.
- the heat treatment apparatus is characterized by being surrounded by a labyrinth formed by a protrusion.
- a plurality of columns are arranged on the outer periphery of the heat retaining unit, at least one column is formed as a tubular body, penetrates the lid, and a power supply line for a heating element unit is arranged in the tubular body.
- a heat treatment apparatus characterized in that:
- the present invention is the heat treatment apparatus, wherein the resistance heating element is made of a high-purity carbon material.
- the present invention is the heat treatment apparatus, wherein the ceramic is quartz. According to the present invention, the amount of heat radiated from the processing atmosphere in the reaction vessel to the outside via the heat retaining unit is reduced, so that the processing atmosphere can be quickly stabilized at the target temperature, and the temperature can be stabilized. A wide area can be secured. In addition, if the heat retaining unit is fixed to the lid, the power supply path member can be easily pulled out.
- the present invention provides a step of holding a multistage object to be processed by a holder, a step of carrying the holder holding the object to be processed into a reaction vessel having an open lower end from below, and a step of reversing the inside of the reaction vessel.
- a heat treatment method characterized in that the temperature on the lower side of the holder is higher than the ambient temperature in which the object is placed.
- the film forming gas is supplied from the lower side of the holder to the upper side, and the temperature of the region where the film forming gas passes under the holder is set on the workpiece.
- This is a heat treatment method characterized by making the temperature higher than the ambient temperature.
- the present invention is the heat treatment method, wherein the film forming gas is supplied from the upper side to the lower side of the holder during the film forming process.
- the lower side of the holder is heated by the heat retaining unit having the heating element unit provided below the holder, and the temperature on the lower side of the holder is higher than the ambient temperature in which the workpiece is placed.
- a heat treatment method characterized by the following.
- the decomposition of the deposition gas is promoted, so that highly uniform processing can be performed.
- FIG. 1 is a vertical sectional side view showing the entire configuration of an embodiment of the present invention.
- FIG. 2 is a perspective view showing an overview of an embodiment of the present invention.
- FIG. 3 is a cross-sectional view showing a heat retaining unit used in one embodiment of the present invention.
- FIG. 4 is a plan view showing a heating unit incorporated in the heat retaining unit used in the embodiment of the present invention.
- FIG. 5 is a characteristic diagram showing changes in the processing atmosphere and the temperature of the heating element unit.
- FIG. 6 is a vertical sectional side view showing the entire configuration of another embodiment of the present invention.
- FIG. 7 is a side view showing another example of the heat retaining unit used in the present invention.
- FIG. 8 is a perspective view showing still another example of the heat retaining unit used in the present invention.
- FIG. 9 is an explanatory diagram showing the uniformity of the film thickness when the apparatus of the present invention and the conventional apparatus are used.
- FIG. 10 is a characteristic diagram showing the results of measuring the heating rate of the heat retaining unit used in the present invention and the conventional heat retaining unit.
- Fig. 11 shows the thermal insulation unit used in the present invention and the conventional thermal insulation unit. It is a characteristic view showing the result of having measured temperature rate.
- FIG. 12 is a vertical sectional side view showing a conventional vertical heat treatment apparatus.
- FIG. 1 is an overall configuration diagram showing an embodiment in which the present invention is applied to a vertical heat treatment apparatus
- FIG. 2 is a schematic view of the vertical heat treatment apparatus.
- Reference numeral 2 in FIG. 1 denotes a reaction tube having a double tube structure including an inner tube 2a and an outer tube 2b made of, for example, quartz. Two holds 3 are provided. Then, a reaction vessel is constituted by the reaction tube 2 and the manifold 3.
- the inner pipe 2 a has an open upper end, and is supported on the inner side of the manifold 3.
- the upper end of the outer tube 2b is closed, and the lower end is air-tightly joined to the upper end of the manifold 3.
- a reaction vessel is constituted by the inner pipe 2a, the outer pipe 2b, and the manifold 3. 31 is a base plate.
- a large number of, for example, 126 wafers W to be processed are placed in a shelf shape on a wafer boat 21 serving as a holder at a vertical interval in a horizontal state.
- the wafer port 21 is provided with a plurality of columns 24 between the top plate 22 and the bottom plate 23, and a groove for holding the peripheral portion of the wafer W is formed in the column 24. It is configured.
- the wafer boat 21 is held on the lid 32 through the area where the heat insulation unit 4 is installed.
- the lid 3 2 which will be described in detail later with respect to this insulation Yunitto 4, carries the wafer boat 2 1 into the reaction tube 2, is mounted on a boat elevator Isseki 3 3 for unloading, When it is at the upper limit position, it serves to close the lower end opening of the manifold 3, that is, the lower end opening of the reaction vessel composed of the reaction tube 2 and the manifold 3.
- a heater 25 made of, for example, a resistance heating body is provided so as to surround the reaction tube.
- a heat insulation layer is provided around the heater 25, and an exterior body is further provided outside the heat insulation layer, thereby forming a heating furnace 26 (see FIG. 2).
- a cooling water system for circulating cooling water around the heating furnace or other heat-generating parts is generally provided to suppress the amount of heat released from the heating furnace 26 or other heat-generating parts to the clean room.
- a flow meter and cutoff (on, off) valves are interposed.
- Adjustable flow check valves are provided in each circulation system.
- a plurality of gas supply pipes are provided around the manifold 3 so that a plurality of processing gases (film forming gases) can be supplied into the inner pipe 2a.
- one of the gas supply pipes 34 is shown, and the gas supply pipe 34 is connected to a gas supply source 35 through a valve VI, a flow meter MFC, and a valve V2.
- An exhaust pipe 36 is connected to the manifold 3 so that air can be exhausted from the space between the inner pipe 2a and the outer pipe 2b. Can be maintained.
- the processing gas is supplied from the lower side of the wafer port 21 to the upper side by the gas supply pipe 34 into the inner pipe 2 a, but the gas supply pipe 34 is moved above the inner pipe 2 a.
- the processing gas may be arranged and supplied from the upper side to the lower side of the evaporation boat 21.
- the heat retaining unit 4 is composed of a heating unit 5 having a planar shape, for example, a circular plate, forming an upper surface.
- a hole 50 is formed in the center of the heating unit 5.
- a shaft tube 41 made of, for example, quartz is provided vertically below the heating unit 5 so that the internal space thereof faces the hole 50.
- a circular fin 42 which is a heat insulating member, is provided substantially horizontally with a gap between the heat generating unit 5 and a central portion of the fin 42.
- a hole 43 communicating with the internal space of the tube 41 is formed.
- the fins 42 have a role of heat insulation for suppressing the heat of the wafer processing region from being radiated to the outside and a role of reflecting the radiant heat from the heating element unit 5.
- the fins 42 and opaque quartz and silicon carbide (S ic).
- a circular heat insulating member (heat insulating body) 44 having a hole 40 formed in the center so as to communicate with the internal space of the shaft tube 41 is provided with a lid 3. It is supported and fixed on top of 2 via support members 45 (see FIG. 2).
- the support member 45 is provided, for example, at approximately three equally spaced positions in the circumferential direction.
- the heat insulating member 4 4 prevents the heat above this from radiating to the lid 33 side. It has a role of suppressing, for example, a block made of quartz or a fin stacked in a plurality of stages can be used.
- the hole 50 of the heating element unit 5, the hole 43 of the fin 42, the internal space of the shaft tube 41 and the hole 40 of the heat insulating member 44 rotate the wafer boat 21 around a vertical axis.
- a through hole is formed to allow the first rotating shaft 6A to pass therethrough.
- a table 61 is provided on the upper part of the first rotating shaft 6A, and a wafer boat 21 is mounted on the table 61.
- the lower part of the first rotating shaft 6A is connected to the second rotating shaft 6B via the transmission part 62, and the second rotating shaft 6B passes through the lid 32 in an airtight manner, and It is connected to the drive unit 63 provided on the whole day 33.
- the driving unit 63 includes, for example, a pulley connected to the rotating shaft 6B, a motor that drives the pulley via a belt, and the like.
- the transmission unit 62 is placed on a table 64 formed at the upper end of the second rotary shaft 6B and a table 64 formed at the lower end of the first rotary shaft 6A. It is a portion formed of a disc-shaped receiving portion 65, in which the rotation of the second rotating shaft 6B is transmitted to the first rotating shaft 6A.
- a plurality of projections (transmission section side projections) 66 having a comb-like cross section and projecting downward are formed on the lower surface of the peripheral edge of the receiving section 65.
- a plurality of protrusions (cover-side protrusions) 67 having a comb-like cross section and projecting upward are formed on the upper surface of 2.
- a labyrinth is formed by the projections 66, 67 being alternately overlapped with each other, and the periphery of the second rotating shaft 6B on the heat retaining unit 4 side is surrounded by the labyrinth, and the gas in the reaction tube 2 is discharged by the labyrinth. It is hard to get into the bearing of the rotating shaft 6B of 2.
- the heating element unit 5 is formed by enclosing a resistance heating element with a small amount of metallic impurities in a ceramic, for example, quartz, and has a thickness of, for example, about 8 mm as shown in FIGS. 3 and 4. It is composed of a quartz disk (quartz plate) 51 and a spiral line 52 made of high-purity carbon material arranged spirally. In addition, quartz may be interposed between adjacent lines 52 adjacent to each other, and in this case, the heat lines 52 are laid between spirally-shaped partition walls made of quartz.
- the heating unit 5 is preferably the same size as or larger than the wafer W in order to increase the heat retaining effect.
- Posts 71 to 73 made of quartz (provided that only two posts are visible in the figure) are provided at the divided portions, and these posts 71 to 73 are fixed to the lid 32.
- One of the three pillars 71 to 73 is formed of a tubular body, and both ends of the heating wire 52 are located, for example, at one location on the periphery of the heating element unit 5.
- a pair of power supply line members connected to the heat transmission line 52 for example, a power supply line made of the same material as the heat transmission line 52 is passed through a thin quartz tube.
- the power supply lines 53, 54 are wired outside the lid 32. Therefore, when an external power supply is connected to the power supply lines 53 and 54, the heating line 52 generates heat.
- the remaining two columns 72 and 73 may be a tubular body or a rod body, and are supported on the upper surface of the lid 32.
- HT 0 High Temperature Oxide
- a predetermined number of wafers W to be processed are held on a wafer boat 21 in a shelf shape, and the boat elevator 33 is lifted up and carried into the reaction vessel.
- the processing atmosphere of the reaction vessel is maintained at, for example, about 600 ° C., and the wafer boat 21 is loaded and the lower end opening of the reaction vessel (specifically, the lower end of the manifold 3).
- the temperature of the processing atmosphere is raised to about 800 ° C., for example, by the heater 25, and the reaction vessel is evacuated by the vacuum pump 37 through the exhaust pipe 36.
- the pressure inside is reduced to a predetermined degree of vacuum.
- FIG. 5 shows the relationship between the temperature of the processing atmosphere (the temperature of the atmosphere in which the wafer W is placed, for example, the temperature at the center height position in the arrangement area of the wafer W) and the temperature of the heating unit 5.
- the state of the change is schematically shown as a solid line a and a dashed line b, respectively.
- time t 1 is the end of loading (loading) of the wafer boat 21, and time t 2 is the processing atmosphere. This is the point at which the temperature has been reached.
- the heating unit 5 waits, for example, at around 100 ° C., and then rises to a target temperature, for example, around 840 ° C.
- the time when the heating element unit 5 and the processing atmosphere reach the respective target temperatures are, for example, substantially the same timing.
- the temperature of the heating element unit 5 is a temperature measured by placing the temperature sensor 1 at a position several millimeters away near the surface of the heating element unit 5.
- the temperature near the surface of the heating element unit 5 is approximately 840 ° C., so that the temperature around the heating element unit 5 and slightly lower side thereof is higher than the temperature of the processing atmosphere near 800 ° C. I have.
- the dichlorosilane gas and the nitric oxide gas supplied to the lower side of the reaction tube 1 are decomposed when passing beside the heat retaining unit 4, and diffuse into the processing atmosphere with the decomposed state. Active species are deposited on W to form a silicon oxide film.
- the power of the heater 25 is controlled to lower the temperature inside the reaction vessel, and the power supplied to the heating element unit 5 is reduced to zero to lower the temperature of the heating element unit 5.
- time t 5 the wafer boat 21 is lowered.
- the heat retaining unit 4 is provided with a heating unit 5 on the upper surface, and generates heat in the heating unit 5 in the process of raising the processing atmosphere in the reaction vessel and in the process of stabilizing to the target temperature.
- the amount of heat radiated from the processing atmosphere to the outside via the heat retaining unit 4 is reduced. Since the heat retaining unit 4 has the heat generating unit 5, the heat retaining unit 4 has a good heat retaining property, and therefore requires a small heat capacity. Therefore, the entire heat retaining unit 4 is heated at a high speed. For this reason, after the temperature of the processing atmosphere reaches the target temperature, the time required to stabilize the temperature, that is, the temperature stabilization time (recovery time) can be shortened, and the throughput can be improved. In addition, the variation in the recovery time for each batch process is reduced, so that the reproducibility of the process is improved.
- the uniformity of temperature The product wafer W can be placed in the lower part of the wafer boat 21 even in the area where the temperature was so low that the sieve had to be placed because of the low temperature. Since the number of sheets to be processed can be increased, the throughput can be improved from this point as well.
- the heat insulation unit 4 is fixed to the lid 32, and the rotation axes (rotation axes 6A and 6B) for rotating the wafer boat 21 are passed through the heat insulation unit 4.
- the power supply lines 53 and 54 of the heating wire 52 of the heating element unit 5 can be easily pulled out to the outside.
- the present invention is not limited to fixing the heat retaining unit 4 to the lid 32, if the heat retaining unit 4 is rotated as in the conventional case, the power supply lines 53 and 54 are drawn out. Therefore, the structure of the above-described embodiment is more advantageous because a slip ring or the like must be used.
- FIG. 6 shows a vertical heat treatment apparatus for oxidizing a silicon film on a wafer W with an oxidizing gas.
- the reactor is composed of a double-tube reaction tube 8 consisting of an inner tube 8a and an outer tube 8b without using the manifold 3.
- An oxidizing gas such as oxygen gas
- oxygen gas is supplied to the gap between the inner pipe 8a and the outer pipe 8b through the gas supply pipe 81, so that the ceiling of the inner pipe 8a is Passing through the hole 80, exhausting from the lower side of the inner pipe 8a through the exhaust pipe 82, the point that the processing pressure is almost normal pressure, and the temperature of the processing atmosphere is one Generally, it is high.
- reference numeral 83 denotes a soaking tube.
- the film quality is affected by the amount of water adhering on the wafer W.
- the heat capacity of the heat retaining unit 4 may be small as described above, the surface area of the components of the heat retaining unit 4 may be small, and the amount of moisture brought into the reaction vessel from outside via the heat retaining unit 4 may be reduced. Less. Therefore, the film quality is improved.
- the surface treatment of the wafer W may be performed before or during the temperature rise.In this case, too, the amount of water brought in is small, so the efficiency of the surface treatment of the wafer W is improved. Can be expected.
- the heat retaining unit 4 shown in FIG. 7 is configured by stacking, in the heat retaining unit 4 described above, fins 91 made of, for example, quartz, which are heat insulating members, below the heat generating unit 5 in multiple stages.
- the heat retaining unit 4 shown in FIG. 8 has a tubular heating element unit 92 not only on the upper surface but also on the side surface.
- the cylindrical heating element unit 92 can be made by sealing the upper edge and the lower edge by interposing the above-described resistance heating wire between, for example, a double-walled quartz tube.
- a quartz block or a quartz fin may be arranged in a region surrounded by the cylindrical heating element unit 92.
- the heat retaining unit 4 may be configured such that the heat generating unit 92 is provided only on the side surface without providing the heat generating unit 5 on the upper surface portion, or the heat generating unit 5 may be provided only on the bottom surface portion.
- the fins described above may be arranged on the upper surface, and the heating element unit 5 may be arranged below the fins.
- a protective film may be formed on the surface of the heating element unit 5 by, for example, CVD, or the surface may be covered with a thin protective plate.
- the material of the heat retaining unit 4 is not limited to quartz, but may be a ceramic such as silicon carbide (SiC). Further, the present invention may be applied to an apparatus that does not rotate wafer boat 21.
- a silicon oxide film was formed on a 200 mm wafer (8-inch wafer) using the vertical heat treatment apparatus shown in Fig. 1.
- a wafer boat with a capacity of 126 wafers was used.
- the temperature of the processing atmosphere was set at 600 ° C when the wafer boat was opened, and the temperature was raised to around 800 ° C to obtain a 5.5 nm film.
- the treatment was performed for 80 minutes with the aim of thickness.
- Dichlorosilane gas and dinitrogen monoxide gas were supplied at a flow rate of 200 sccm and 400 sccm, respectively, as a film forming gas, and the pressure in the reaction vessel was maintained at a predetermined vacuum. Further, the temperature in the vicinity of the surface of the heat generating unit 5 of the heat retaining unit 4 was raised to around 840 ° C. as described in the above embodiment.
- the bar graph (open) in FIG. 9 was obtained.
- the result was indicated by a mark.
- the top position, center position, and bottom position indicate the sixth, 58th, and 110th stages, respectively, counted from the top of the wafer boat.
- a film was formed on a wafer W in exactly the same manner except that a conventional heat retaining unit composed of a cylindrical body having no heating unit shown in FIG. 12 was used.
- a conventional heat retaining unit composed of a cylindrical body having no heating unit shown in FIG. 12 was used.
- the results were as shown in a bar graph (shaded line) and a seal mark in FIG. 9, respectively.
- the average film thickness at each of the top and bottom positions varies, but a heat retaining unit with a heating unit was used.
- the average film thickness is almost uniform.
- the in-plane uniformity of the film thickness exceeds 6% in the case of the comparative example, whereas in the present invention, it is about 5% at the top and 3% at the center and the bottom. It is understood that the inventive device is effective.
- the in-plane uniformity is a value represented by (Max-Min) / Ave x 1/2 x 100 where the maximum, minimum, and average values of the film thickness are Max, Min, and Ave, respectively. .
- a 200 mm wafer was oxidized to oxidize the silicon film on the wafer W surface. Processing during wafer boat opening The temperature of the atmosphere was set at 300 ° C., the temperature was raised to 850 ° C., and the treatment was performed for a predetermined time with a target of an oxide film having a thickness of 2 nm. As a comparative example, 20 quartz fins were stacked, and the same treatment was performed using a heat retaining unit without a heating element unit. I checked whether it could be secured.
- the uniformity of the film thickness of the wafers in the second to fourth stages from the bottom is 3.
- the uniformity of the film thickness of the wafer was 2.88% by mounting the side wafers from the lowest stage to the fifth stage of the wafer boat. Therefore, the present invention can reduce the number of side wafers (dummy wafers) per batch process. Conversely, it can be said that the area that can be processed (the area where the product wafer can be mounted) is expanded while ensuring the same in-plane uniformity of the film thickness as compared with the comparative example.
- the particle contamination on the wafer W was also evaluated, and the result was equivalent to that of the comparative example. It was found that the provision of the heating element unit did not affect the particle contamination.
- Example 2 when the temperature in the vicinity of the surface of the heating unit according to the present invention and the temperature in the vicinity of the upper part of the heat retaining unit according to the comparative example were examined for the state of temperature rise, the results shown in FIG. 10 were obtained.
- . a and b correspond to the heat retention unit according to the present invention and the heat retention unit of the comparative example, respectively.
- the temperature rise of the heat retention unit is fast, and the temperature of the heat retention unit is stable in the time region (recovery region) where the temperature is stabilized at the target processing temperature, whereas in the comparative example, the temperature rise of the heat retention unit is increased. It is slow and the temperature continues to rise in the recovery area. Therefore, it can be seen from this result that the temperature stabilization time is shortened according to the present invention.
- FIG. 11 shows the manner in which the temperature of the heat retaining unit is lowered from the time when unloading is started in the first embodiment.
- a and b respectively correspond to the heat retention unit according to the present invention and the heat retention unit of the comparative example. From this result, it can be seen that the heat retention unit of the present invention has a heating element unit and therefore has a small heat capacity, so that the temperature is quickly lowered. Therefore, when the wafer boat is carried out to the loading area, thermal damage to the robot, the sensor, and the like can be reduced.
- the time required for temperature stabilization can be shortened, so that the throughput can be improved.
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00979004A EP1156518B1 (en) | 1999-11-30 | 2000-11-29 | Heat treating device and heat treating method |
US09/890,328 US6444940B1 (en) | 1999-11-30 | 2000-11-29 | Heat treating device and heat treating method |
DE60038669T DE60038669T2 (de) | 1999-11-30 | 2000-11-29 | Wärmebehandlungsgerät und methode |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33974999A JP3598032B2 (ja) | 1999-11-30 | 1999-11-30 | 縦型熱処理装置及び熱処理方法並びに保温ユニット |
JP11/339749 | 1999-11-30 |
Publications (1)
Publication Number | Publication Date |
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WO2001041202A1 true WO2001041202A1 (fr) | 2001-06-07 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2000/008401 WO2001041202A1 (fr) | 1999-11-30 | 2000-11-29 | Dispositif et procede de traitement thermique |
Country Status (7)
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US (1) | US6444940B1 (ja) |
EP (1) | EP1156518B1 (ja) |
JP (1) | JP3598032B2 (ja) |
KR (2) | KR100709802B1 (ja) |
DE (1) | DE60038669T2 (ja) |
TW (1) | TW478046B (ja) |
WO (1) | WO2001041202A1 (ja) |
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JP3912208B2 (ja) * | 2002-02-28 | 2007-05-09 | 東京エレクトロン株式会社 | 熱処理装置 |
US6902395B2 (en) | 2002-03-15 | 2005-06-07 | Asm International, N.V. | Multilevel pedestal for furnace |
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Also Published As
Publication number | Publication date |
---|---|
US6444940B1 (en) | 2002-09-03 |
DE60038669T2 (de) | 2009-05-28 |
KR100638946B1 (ko) | 2006-10-25 |
JP3598032B2 (ja) | 2004-12-08 |
KR20010101717A (ko) | 2001-11-14 |
TW478046B (en) | 2002-03-01 |
KR100709802B1 (ko) | 2007-04-24 |
EP1156518A4 (en) | 2004-10-27 |
EP1156518A1 (en) | 2001-11-21 |
DE60038669D1 (de) | 2008-06-05 |
KR20060064030A (ko) | 2006-06-12 |
EP1156518B1 (en) | 2008-04-23 |
JP2001156005A (ja) | 2001-06-08 |
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