WO2005001171A1 - 単結晶の製造方法及び単結晶 - Google Patents
単結晶の製造方法及び単結晶 Download PDFInfo
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- WO2005001171A1 WO2005001171A1 PCT/JP2004/007350 JP2004007350W WO2005001171A1 WO 2005001171 A1 WO2005001171 A1 WO 2005001171A1 JP 2004007350 W JP2004007350 W JP 2004007350W WO 2005001171 A1 WO2005001171 A1 WO 2005001171A1
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- single crystal
- pulling
- crystal
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- producing
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/02—Elements
- C30B29/06—Silicon
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
- C30B15/20—Controlling or regulating
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
- C30B15/20—Controlling or regulating
- C30B15/203—Controlling or regulating the relationship of pull rate (v) to axial thermal gradient (G)
Definitions
- the present invention relates to a method for producing a single crystal by the Czochralski method, and particularly to a method for producing a single crystal having a desired defect region.
- a single crystal used as a substrate of a semiconductor device includes, for example, a silicon single crystal and the like, and is mainly manufactured by a Czochralski method (hereinafter abbreviated as CZ method).
- CZ method Czochralski method
- V crystal pulling rate
- FPD Flow Pattern Defect
- Groin-in defects such as COP (Crystal Originated Particle) and COP exist at high density throughout the crystal diameter direction. The region where these void-induced defects exist is called a V (Vacancy) region.
- an OSF Oxidation Induced Stacking Fault
- the ⁇ SF ring contracts to the center of the ⁇ a and disappears.
- defects such as LSEPD (Large Secco Etch Pit Defect) and LFPD (Large Flow Pattern Defect), which are considered to be caused by dislocation loops in which interstitial silicon has gathered, exist at low density.
- the area where these defects exist is called the I (Interstitial) area.
- the V / G value is set within a predetermined range at the center of the crystal (for example, 0 ⁇ 112—0.142 mm 2 / ° C *). It is shown that a silicon single crystal wafer free of void-induced defects and defects caused by dislocation loops can be obtained by pulling the single crystal while controlling the thickness to (min). In recent years, there has been an increasing demand for defect-free crystals in the N region that does not include the Cu deposit defect region. It has been done.
- the crystal temperature gradient G in the pulling axis direction has been uniquely determined by the HZ (hot zone: in-furnace structure) of a single crystal pulling apparatus in which a single crystal is grown.
- HZ hot zone: in-furnace structure
- the crystal temperature gradient G must be reduced. No control is performed during the lifting, and the VZG value is adjusted by adjusting the pulling speed V. 2. Description of the Related Art Controlling a single crystal having a desired defect region has been performed.
- the crystal temperature gradient G tends to decrease as the growth of a single crystal proceeds, and is smaller at the end of the growth than at the start of the growth of the single crystal straight body. Therefore, in order to control V / G to be almost constant at a desired value, the pulling speed V is changed so as to become slower in accordance with the change (decrease) in the crystal temperature gradient G as the growth of the single crystal progresses. As a result, there has been a problem that the time required for growing the single-crystal straight body part becomes longer, thereby lowering productivity.
- the pulling speed at the end of the growth of the single crystal straight body portion has an influence on the pulling speed and the pulling time of the single crystal in the rounding step performed thereafter to form the single crystal tail. Therefore, as described above, when the pulling speed at the end of the growth of the straight body part is low, the pulling speed in the rounding process is also low, and the pulling time is further prolonged. This leads to an increase in manufacturing costs. Disclosure of the invention
- an object of the present invention is to provide a method of growing a single crystal by the CZ method while reducing the pulling speed V without lowering the pulling speed V.
- An object of the present invention is to provide a single crystal manufacturing method capable of controlling a VZG by controlling a change in a crystal temperature gradient G and controlling a VZG so that a single crystal having a desired defect region can be efficiently manufactured in a short time.
- the crystal temperature gradient G is The diameter of the single crystal straight body, the rotation speed of the single crystal when pulling up the single crystal, the flow rate of the inert gas introduced into the chamber, the position of a heater for heating the raw material melt, the raw material At least two or more of the distances between the melt surface of the melt and the heat shield member disposed opposite to the raw material melt surface in the chamber are changed. And the ratio V / G (mm 2 / ° C * min) of the pulling speed V and the crystal temperature gradient G is controlled so that a single crystal having a desired defect region can be grown.
- the crystal temperature gradient G can be controlled with very high accuracy over a very wide range, thereby reducing the pulling speed V.
- VZG can be controlled with a high degree of accuracy without the need, and a single crystal having a desired defect region can be efficiently manufactured in a short time. If a single crystal can be efficiently produced in this way, productivity in the production of a single crystal can be improved, and costs can be reduced.
- the single crystal can be pulled by setting the pulling speed V to a constant value.
- the crystal temperature gradient G can be controlled with high precision over a wide range. Even when a single crystal is pulled with a constant value, V / G can be easily and reliably controlled so that a single crystal in a desired defect region can be grown. Accordingly, a single crystal having the same defect region in the crystal growth axis direction can be easily pulled while keeping the pulling speed V constant at a high speed.
- making the pulling speed V a constant value in the present invention means that the average pulling speed at each crystal part of the single-crystal straight body is made constant, and that each crystal part of the single crystal is made constant. If the average pulling speed in the above becomes a constant value, V can be varied within a predetermined range with respect to the average pulling speed at each crystal part in order to precisely control the diameter of the single crystal to a predetermined value. is there.
- the V / G it is preferable to control the V / G so that the defect region of the single crystal to be grown becomes an N region over the entire surface in the radial direction.
- the at least two or more pulling conditions are automatically changed in accordance with a changing condition obtained by performing a test in advance.
- the crystal temperature gradient G when the crystal temperature gradient G is controlled by changing at least two or more of the pulling conditions described above, the crystal temperature gradient G in the manufacturing environment where the single crystal is actually manufactured is obtained.
- the relationship between the state, each pulling condition, and the crystal temperature gradient G is clarified in advance by simulation analysis or tests such as actual production, and the bow I to be changed based on the information obtained is selected.
- Change conditions such as the degree of change in the conditions for raising the bow and its bow I, are required. Then, by changing the selected pulling condition during the pulling of the single crystal in accordance with the changing condition, the crystal temperature gradient G can be automatically controlled with high precision, and the single crystal having a desired defect region can be extremely controlled. It can be manufactured stably.
- the changing conditions for changing the at least two or more pulling conditions are adjusted between single crystal production batches.
- the manufacturing environment may change between the single crystal manufacturing batches due to deterioration of parts constituting the HZ in the single crystal pulling apparatus.
- the change conditions for changing at least two or more pulling conditions between the single crystal production batches as in the present invention, it becomes possible to correct the change in the manufacturing environment, and thereby to correct the single crystal. Even if multiple batches of production are performed, the production of single crystals can be performed very stably without variation in quality between production batches.
- the single crystal to be manufactured can be a silicon single crystal.
- the method for producing a single crystal of the present invention can be particularly suitably used for producing a silicon single crystal, whereby the VZG can be controlled without lowering the pulling speed V to obtain a desired single crystal.
- a silicon single crystal having a defect region can be efficiently manufactured in a short time.
- a single crystal manufactured by the method for manufacturing a single crystal is provided.
- the single crystal produced according to the present invention can be a very high quality single crystal having a desired defect region. Furthermore, the single crystal of the present invention was produced efficiently in a short time. Therefore, it is cheaper than the conventional one.
- the crystal temperature gradient G can be controlled over a wide range and accurately by changing at least two of the pulling conditions described above. Therefore, VZG can be controlled with high accuracy regardless of the pulling speed V. Therefore, it is possible to grow a single crystal having a desired defect region at a constant value without lowering the pulling speed V, thereby enabling efficient single crystal production in a shorter time than before. Thus, it is possible to improve productivity in the production of a single crystal without lowering the yield and to achieve a significant cost reduction.
- FIG. 1 is a graph showing an example of the relationship between the diameter of a single crystal straight body portion and a crystal temperature gradient G.
- FIG. 2 is a graph showing an example of a relationship between a rotation speed of a single crystal and a crystal temperature gradient G.
- FIG. 3 is a graph showing an example of a relationship between a flow rate of an inert gas and a crystal temperature gradient G.
- FIG. 4 is a graph showing an example of a relationship between a relative distance L2 from a heat generation center position of a heater to a raw material melt surface and a crystal temperature gradient G.
- FIG. 5 is a graph showing an example of a relationship between a distance L1 between a raw material melt surface and a heat shielding member and a crystal temperature gradient G.
- FIG. 6 is a schematic configuration diagram illustrating an example of a single crystal pulling apparatus that can be used when performing the method for producing a single crystal of the present invention.
- FIG. 7 is an explanatory diagram showing a relationship between VZG and crystal defect distribution.
- V / G should be controlled by controlling the crystal temperature gradient G in order to efficiently produce a single crystal having a desired defect region in a short period of time.
- the diameter of the straight body of the crystal, the rotation speed at which the single crystal is rotated when pulling the single crystal, the flow rate of the inert gas introduced into the chamber during the growth of the single crystal, and the flow of the raw material melt during the growth of the single crystal The position of the heater to be heated and the melt surface of the raw material melt are set so as to face the raw material melt surface. We paid attention to the distance from the heat shield member.
- the above-described pulling conditions are deliberately changed during the pulling of the single crystal, whereby the melting point of silicon near the solid-liquid interface is reduced by 1400
- the crystal temperature gradient G in the pulling axis direction during the pulling of the single crystal can be controlled, and the control of the VZG can be performed without changing the pulling speed to a low speed by making the crystal temperature gradient G during the pulling of the single crystal. I found that it is possible.
- the comprehensive heat transfer analysis software FEMAG F. Dupret, P. Nicodeme, Y. Rye km ans, P. Wouters, and MJ Crochet, Int. J. Heat Mass Transfer, 33, 1849 (1990)
- FIGS. 1 and 5 show examples of the results of simulation analysis of the change in the crystal temperature gradient G in the case of the above.
- the crystal temperature gradient G can be increased by changing the position of the heater or by reducing the distance L1 between the raw material melt surface and the heat shield, while increasing the diameter of the straight body, Slow down, reduce the flow rate of inert gas, change the position of the heater so that the relative distance L2 between the center of the heat generated by the heater and the surface of the raw material melt is small, or change the distance L1 between the raw material melt surface and the heat shield. Increase It was found to be reduced crystal temperature gradient G by.
- the control of the crystal temperature gradient G can be performed in a very wide range and extremely. It was also revealed that the single crystal having a desired defect region can be grown very stably with high precision. In other words, if only one parameter is used, only the change in the crystal temperature gradient G as shown in each figure can be obtained.However, by combining two or more parameter change controls, the crystal temperature gradient G can be freely adjusted. It can be controlled effectively.
- the present invention utilizes such a relationship between the pulling conditions during the pulling of a single crystal and the crystal temperature gradient G.
- the method for producing a single crystal according to the present invention is characterized in that, when growing a single crystal by the CZ method, the diameter of the single crystal straight body, the rotation speed of the single crystal when pulling the single crystal, and the inertness introduced into the chamber Pulling conditions of at least two of the gas flow rate, the position of the heater that heats the raw material melt, and the distance between the melt surface of the raw material melt and the heat shield member facing the raw material melt surface in the chamber.
- the crystal temperature gradient G is controlled by changing the temperature, and V / G is controlled to a desired value so that a single crystal having a desired defect region can be grown.
- the single crystal bow I raising device used in the method for producing a single crystal of the present invention is a device for controlling the diameter of the single crystal, controlling the rotation speed of the single crystal, and controlling the flow rate of the inert gas during the raising of the single crystal bow I.
- a quartz crucible 5 containing a raw material melt 4 and a graphite crucible 6 protecting the quartz crucible 5 are placed in a main chamber 1 by a crucible driving mechanism 21. It is supported by a holding shaft 13 so that it can rotate and move up and down.A heating heater 7 and a heat insulating material 8 are arranged so as to surround these crucibles 5 and 6, and the position of the heating heater 7 can be adjusted. Is provided with heater driving means 22.
- a pulling chamber 2 for containing and taking out the grown single crystal 3 is connected to the upper part of the main chamber 1, and the single crystal 3 is pulled by rotating the single crystal 3 with a wire 14 at the upper part of the pulling chamber 2.
- a raising mechanism 17 is provided.
- a gas straightening cylinder 11 is provided inside the main chamber 1, and a heat shield member 12 is installed below the gas straightening cylinder 11 so as to face the raw material melt 4.
- the radiation from the surface of the melt 4 is cut, and the surface of the raw material melt 4 is kept warm.
- a heat-shielding member driving unit 23 that can raise and lower the gas rectifier 11 to adjust the position of the heat-shielding member 12 up and down is provided above the gas straightening tube 11.
- the shape, material, and the like of the heat shield member 12 are not particularly limited, and may be appropriately changed as needed.
- the heat shield member 12 of the present invention is not limited to the one provided at the lower part of the gas flow straightening tube as described above, as long as it is disposed opposite to the melt surface.
- an inert gas such as an argon gas can be introduced from a gas inlet 10 provided in the upper part of the pulling chamber 2 while adjusting the flow rate with a valve 24, and the single crystal 3 being pulled and the gas rectifying cylinder 11 can be introduced. After that, it can pass between the heat shield member 12 and the melt surface of the raw material melt 4 and be discharged from the gas outlet 9.
- the pulling condition control means 18 includes, for example, the position of the heater 7, the positions of the crucibles 5 and 6, the position of the heat shielding member 12, the flow rate of the inert gas, and the position of the raw material melt surface measured by the CCD camera 19. Information such as the diameter of the single crystal 3, the temperature of the raw material melt measured by a radiation thermometer (not shown), and the pulling length of the single crystal obtained from the pulling mechanism 17 is fed back to the heating heater 7.
- the driving of the pulling mechanism 17, the opening and closing of the valve 24, the driving of the heater driving means 22, and the driving of the crucible driving mechanisms 21 and Z or the heat shielding member driving means 23, respectively, to the pulling length of the single crystal, etc. Adjust the diameter of the single crystal straight body, the rotation speed of the single crystal when pulling the single crystal, the flow rate of the inert gas introduced into the chamber, the position of the heater for heating the raw material melt, and the raw material. Increase the distance L1 between the melt surface and the heat shield Control and change with high precision.
- an inert gas eg, argon gas
- the seed crystal 16 fixed to the seed holder 15 is immersed in the raw material melt 4 in the stone crucible 5 and then gently pulled up while rotating to form a seed aperture and then expanded to the desired diameter
- the silicon single crystal 3 having a substantially cylindrical straight body can be grown.
- the pulling axis direction near the solid-liquid interface is changed.
- the crystal temperature gradient G can be controlled, whereby the VZG can be controlled while maintaining the pulling speed V at a constant value without reducing the speed, so that a single crystal having a desired defect region can be formed in a short time. It can be raised efficiently.
- the silicon single crystal is pulled so that the straight body portion of the single crystal can be grown in the N region.
- the raising speed V is set according to the manufacturing environment in which the single crystal is manufactured (for example, HZ of a single crystal pulling apparatus). At this time, the pulling speed V can be set to the maximum value within a range where a single crystal can be grown in the N region.
- the power of the heater 7 is adjusted to increase the power of the heater, and the raw material melt 4 is heated to reduce the diameter of the single crystal straight body.
- Change the thickness to be thinner change the rotation speed of the single crystal to increase by the pulling mechanism 17, open the valve 24 and increase the flow rate of the inert gas introduced into the chamber
- the position of the heater 7 is changed by the heater driving means 22 so that the relative distance L2 between the heat generation center position of the heater 7 and the surface of the raw material melt is increased (the position of the heater is lowered).
- at least two of the changes in each pulling condition when the distance L1 between the raw material melt surface and the heat shielding member 12 is changed to be reduced are performed.
- the distance L1 between the raw material melt surface and the heat shield member is determined by pushing up the quartz crucible 5 and the graphite knurled boss 6 by the crucible drive mechanism 21 at a speed different from the melt surface decrease due to crystal growth.
- the center of heat generated by the heater is lower than the position of the surface of the raw material melt is described as an example.
- the center of heat generated by the heater can be controlled to be higher than the surface of the melt. is there.
- the power of the heater 7 is reduced to change the diameter of the single crystal straight body portion to be large.
- the gas flow rate by closing the valve 24 and to reduce the relative distance L2 between the heating center position of the heating heater 7 and the surface of the raw material melt. Change the position of the heater (increase the position of the heater), and change the distance L1 between the raw material melt surface and the heat shield member 12 to increase it. .
- the crystal temperature gradient G can be extremely reduced without causing the inconvenience of changing only one pulling condition.
- a single crystal having a desired defect region can be grown very stably while controlling with high precision over a wide range.
- the straight-body portion of the straight body is controlled to have a desired value of V / G.
- the diameter may be excessively increased.As a result, the processing margin is increased when the outer peripheral surface of the single crystal cylinder is ground to obtain the desired diameter of the straight body after growing the single crystal. There is a risk that the yield will increase and the yield will deteriorate.
- the diameter of the straight body is excessively reduced during VZG control during single crystal growth, sufficient machining allowance is required for subsequent grinding. However, there is a possibility that inconveniences such as a small diameter defect may occur due to failure to secure the diameter.
- the single crystal becomes too low.
- the shape of the straight body may be deformed, the in-plane quality distribution may be deteriorated, and the yield may be reduced.
- the position of the heater is changed only, If the position is changed too much, the grown crystal may be dislocated, or the temperature of the raw material melt may be difficult to control because the raw material melt cannot be appropriately heated.
- the crystal temperature gradient G can be controlled in a very wide range without excessively changing any one of the pulling conditions.
- the control accuracy and the responsiveness of the crystal temperature gradient G by changing the pulling conditions can be improved. Therefore, V / G can be controlled with very high precision without causing any inconvenience due to the overshoot of the pulling conditions described above due to IJ fluctuations, and a single crystal having a desired defect region is extremely stable.
- the present invention provides a method for growing a single crystal, the diameter of a straight body of a single crystal, the rotation speed of a single crystal, the flow rate of an inert gas, the position of a heater, and the distance between a raw material melt surface and a heat shield member. It is sufficient to change at least two or more pulling conditions of the distance L1. The actual production of the single crystal is performed. The number and parameters of pulling conditions to be changed according to the manufacturing environment (for example, the structure of HZ), etc. Can be appropriately selected.
- control range of each pulling condition when changing the pulling condition can be appropriately determined according to the single crystal manufacturing environment and the like, and is not particularly limited. If the pulling conditions are excessively changed during crystal growth, various inconveniences as described above may occur. Therefore, during pulling of the single crystal, it is preferable to change each pulling condition within a range where the single crystal can be stably grown.
- the fluctuation range of the diameter be within ⁇ 5% of the fluctuation center value.
- the diameter of the straight body is reduced by 152 mm during the growth of the single crystal, taking into account the processing allowance when grinding the outer peripheral surface of the crystal after the growth of the single crystal.
- a single crystal with a diameter of 300 mm can be changed by changing the diameter within a range of about 160 mm (the center of variation is 156 mm) and a diameter of 200 mm for a single crystal with a diameter of about 202 216 mm (the center of variation is 209 mm). In the case of, it is better to change the diameter in the range of 302 to 320 mm (the center value of fluctuation is 31 lmm).
- the rotation speed of the single crystal When the rotation speed of the single crystal is changed, the rotation speed may be changed, for example, in the range of 0.1 to 40 rpm, preferably 5 to 14 rpm, depending on the diameter of the single crystal to be pulled.
- the flow rate of the inert gas should be changed in the range of 10-2000 L / min, preferably 60-300 L / min.
- the heater position is changed so that the relative distance L2 between 0 and 500 mm, preferably 10 and 200 mm, more preferably 30 and 100 mm, and the distance L1 between the raw material melt surface and the heat shielding member is changed. It is desirable to change the thickness within a range of 500 mm, preferably 10-300 mm, and more preferably 20-200 mm.
- V / G can be controlled to a predetermined value regardless of the pulling speed V. It becomes.
- the pulling speed V during the growth of the single crystal is maintained at a predetermined value or higher without lowering the pulling speed V unlike the conventional method, and in particular, while maintaining the constant constant at the maximum pulling speed as the defect region, a desired defect region, for example, N It is possible to easily control V / G so that a single crystal having a region can be obtained.
- the pulling speed V is not necessarily constant.
- the productivity of the single crystal can be significantly improved by making the maximum value of the pulling speed that becomes the desired defect region constant as described above.
- the method for producing a single crystal of the present invention provides an average Since the crystal pulling rate can be improved, the growth of the same part of a single crystal in a month can be performed in a shorter time than before, and the pulling rate at the end of the growth of the single crystal straight body does not become lower. Since the pulling time in the rounding process can be shortened, very high-quality silicon single crystal in which the entire surface in the crystal diameter direction is an N region can be manufactured with high productivity. In addition, the shortening of the manufacturing time also reduces the possibility of dislocations in the crystal, and can improve the yield that can not only be achieved by productivity. As a result, the productivity of the single crystal is improved, so that the cost can be significantly reduced, and the ability to provide the single crystal at a very low cost can be achieved.
- a single crystal can be formed by controlling V / G with high precision in a region that does not include a Cu depot defect region, in an Nv region or a Ni region in an N region, in a narrow region, or in a region. This makes it possible to produce a single crystal of high quality having a desired defect region over the entire region in the crystal growth axis direction, in a very stable manner.
- the state of the crystal temperature gradient G and the relationship between the crystal temperature gradient G and each pulling condition in a production environment for producing the single crystal are determined in advance, for example.
- the change conditions such as selection of pulling conditions to be changed during single crystal pulling and the degree to which the pulling conditions are changed. Can be.
- the change conditions thus obtained are input to the pulling condition control means 18 shown in FIG. 6, and when growing a single crystal, for example, the position of the heater 7 and the crucibles 5, 6 Position, the position of the heat shield member 12, the flow rate of the inert gas, the position of the raw material melt measured by the CCD camera 19, the diameter of the single crystal 3, the temperature of the raw material melt measured by the radiation thermometer (not shown), Information such as the pulling length of the single crystal obtained from the pulling mechanism 17 is fed back to the pulling condition control means 18, and the heating heater 17, the pulling mechanism 17, and the crucible driving mechanism are controlled by the pulling condition control means 18 according to the changed conditions. 21, heater driving means 22, heat shielding member driving means 23, and valve 24 can be adjusted.
- each pulling condition is automatically controlled and changed according to the pulling length of the single crystal, etc. Can be controlled at any time. Therefore, V / G control can be automatically performed with high accuracy, and a single crystal having a desired defect region can be more easily and stably manufactured.
- the manufacturing environment of HZ etc. changes between single crystal production batches due to deterioration of the components that make up the HZ in the single crystal pulling device.
- the HZ parts are often made of graphite, and among them, the heater is usually a graphite heater, and the temperature distribution gradually changes with the use.
- the manufacturing environment changes between the single crystal production batches, the crystal temperature gradient G also changes between the production batches.
- a single crystal pulling apparatus 20 shown in Fig. 6 150 kg of raw material polycrystalline silicon is charged into a 24-inch (600 mm) quartz crucible, and oriented by the CZ method while flowing argon gas from the gas inlet 10.
- a silicon single crystal having an oxygen concentration of 100> and an oxygen concentration of 22 23 ppma (ASTM'79) was grown (the length of the single crystal straight body was about 120 cm).
- the diameter of the same part in the same month should be 200 mm in diameter.
- the thickness was made larger than 200 mm.
- a simulation analysis is performed in advance to check the crystal temperature gradient G, and based on the result of the analysis, the pulling of the single crystal straight body during the pulling of the single crystal is performed.
- the diameter, the rotation speed of the single crystal, the flow rate of the argon gas, the position of the heater (the relative distance L2 between the center of heat generation of the heater and the surface of the raw material melt), and the distance L1 between the surface of the raw material melt and the heat shielding member It is controlled and changed by the pulling condition control means 18 so as to obtain the values shown in Table 1 below, and the crystal bow I raising speed is controlled to be a constant value after 1 Ocm of the single crystal straight body.
- the outer peripheral surface of the single crystal grown as described above was subjected to grinding to adjust the diameter of the straight body to 200 mm. Then, the part of the obtained single crystal at every 10 cm in the growth axis direction A wafer for inspection was cut out from the position, surface grinding and polishing were performed to prepare a sample for inspection, and inspection of crystal quality characteristics as shown below was performed.
- Oxide film 25nm
- Electrolytic strength 6MV / cm
- test sample was subjected to a thermal oxidation treatment in a dry atmosphere to form a gate oxide film of 25 nm, on which a phosphorus-doped polysilicon electrode having an electrode area of 8 mm 2 was formed. Then, a voltage was applied to the polysilicon electrode formed on the oxide film to evaluate the withstand voltage of the oxide film. At this time, the determination current was ImA / cm 2 .
- a wafer for inspection was cut out from a site of every 10 cm in the growth axis direction of the obtained single crystal, and then subjected to surface grinding and polishing to prepare a sample for inspection, and the same crystal quality characteristics as in the example were obtained. The inspection was performed.
- the average pulling rate of the example was lower than that of the comparative example. It was about 033mm / min.
- the silicon single crystal having the same or higher crystal quality was efficiently produced in a shorter time than the comparative example. I found that it could be built. Further, the silicon single crystals obtained in Examples and Comparative Examples were visually observed. As a result, no defective portion was observed in either of the single crystals, and it was confirmed that the single crystal of the example can achieve a high yield equal to or higher than that of the comparative example.
- the present invention is not limited to the above embodiment.
- the above embodiments are merely examples, and those having substantially the same configuration as the technical idea described in the claims of the present invention and having the same function and effect are those that can be achieved. Even so, they are included in the technical scope of the present invention.
- the present invention is not limited to this.
- the V region or the I region, or the ⁇ SF region A single crystal can be grown in a desired defect region.
- the present invention can be suitably used when manufacturing a silicon single crystal, but is not limited to this, and can be similarly applied to a case where a compound semiconductor single crystal or the like is manufactured.
- the method for producing a single crystal of the present invention is not necessarily limited to the case where the method is carried out over the entire length of the single crystal straight body portion.
- a desired defect area is controlled by changing one or more of them.
- the pulling speed and the diameter of the region 10 cm from the shoulder, which is the first half of the straight body may not be stable.Therefore, this should be done 5 cm or 10 cm after the straight body, which tends to become a steady state. Is preferred.
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Application Number | Priority Date | Filing Date | Title |
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US10/560,581 US7384477B2 (en) | 2003-06-27 | 2004-05-28 | Method for producing a single crystal and a single crystal |
EP04745386A EP1640484A1 (en) | 2003-06-27 | 2004-05-28 | Process for producing single crystal and single crystal |
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JP2003185773A JP2005015312A (ja) | 2003-06-27 | 2003-06-27 | 単結晶の製造方法及び単結晶 |
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US (1) | US7384477B2 (ja) |
EP (1) | EP1640484A1 (ja) |
JP (1) | JP2005015312A (ja) |
KR (1) | KR20060028424A (ja) |
WO (1) | WO2005001171A1 (ja) |
Cited By (1)
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US20100288184A1 (en) * | 2006-02-21 | 2010-11-18 | Toshiaki Ono | Silicon single crystal wafer for igbt and method for manufacturing silicon single crystal wafer for igbt |
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TW200428637A (en) * | 2003-01-23 | 2004-12-16 | Shinetsu Handotai Kk | SOI wafer and production method thereof |
JP4701738B2 (ja) * | 2005-02-17 | 2011-06-15 | 株式会社Sumco | 単結晶の引上げ方法 |
JP4784401B2 (ja) * | 2006-05-30 | 2011-10-05 | 株式会社Sumco | シリコン単結晶の育成プロセスにおける融液の液面位置監視装置 |
JP5125003B2 (ja) * | 2006-06-26 | 2013-01-23 | 信越半導体株式会社 | シリコン単結晶の製造システムおよびこれを用いたシリコン単結晶の製造方法 |
KR100827033B1 (ko) * | 2006-12-28 | 2008-05-02 | 주식회사 실트론 | 무결함 단결정 제조 방법 및 이 방법에 의해 제조된 단결정 |
KR100869218B1 (ko) * | 2006-12-28 | 2008-11-18 | 주식회사 실트론 | 열실드 거리결정 방법 및 이를 이용한 실리콘 단결정잉곳의 제조장치 |
DE112008000893B8 (de) * | 2007-04-24 | 2022-02-24 | Sumco Techxiv Corp. | Verfahren und Vorrichtung zum Herstellen von Siliziumeinkristallen und Siliziumeinkristallingot |
JP5150865B2 (ja) * | 2008-04-30 | 2013-02-27 | 株式会社Sumco | シリコン単結晶インゴットの製造方法 |
US8221545B2 (en) * | 2008-07-31 | 2012-07-17 | Sumco Phoenix Corporation | Procedure for in-situ determination of thermal gradients at the crystal growth front |
JP5417965B2 (ja) * | 2009-04-21 | 2014-02-19 | 株式会社Sumco | 単結晶成長方法 |
JP5552875B2 (ja) * | 2010-04-12 | 2014-07-16 | 株式会社Sumco | 単結晶の製造方法および半導体ウェーハの製造方法 |
JP5696710B2 (ja) * | 2012-10-31 | 2015-04-08 | 株式会社Sumco | シリコン単結晶インゴット |
CN111962140A (zh) * | 2020-08-28 | 2020-11-20 | 晶科绿能(上海)管理有限公司 | 连续拉晶装置和连续拉制晶棒的方法 |
JP7359241B2 (ja) * | 2022-03-15 | 2023-10-11 | 株式会社Sumco | シリコン単結晶の製造方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08268794A (ja) * | 1995-03-30 | 1996-10-15 | Sumitomo Sitix Corp | 単結晶シリコン育成方法 |
JPH08330316A (ja) * | 1995-05-31 | 1996-12-13 | Sumitomo Sitix Corp | シリコン単結晶ウェーハおよびその製造方法 |
JP2000063196A (ja) * | 1998-08-18 | 2000-02-29 | Murata Mfg Co Ltd | 酸化物単結晶の製造方法 |
JP2002338389A (ja) * | 2001-05-15 | 2002-11-27 | Sumitomo Mitsubishi Silicon Corp | シリコン単結晶酸素濃度の制御方法 |
JP2003002786A (ja) * | 2001-06-25 | 2003-01-08 | Shin Etsu Handotai Co Ltd | シリコン単結晶基板、エピタキシャルウエーハおよびこれらの製造方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3460551B2 (ja) | 1997-11-11 | 2003-10-27 | 信越半導体株式会社 | 結晶欠陥の少ないシリコン単結晶ウエーハ及びその製造方法 |
US6245430B1 (en) * | 1997-12-12 | 2001-06-12 | Sumitomo Sitix Corporation | Silicon single crystal wafer and manufacturing method for it |
JP3943717B2 (ja) * | 1998-06-11 | 2007-07-11 | 信越半導体株式会社 | シリコン単結晶ウエーハ及びその製造方法 |
JP3255114B2 (ja) * | 1998-06-18 | 2002-02-12 | 信越半導体株式会社 | 窒素ドープした低欠陥シリコン単結晶の製造方法 |
JP4293395B2 (ja) | 1999-04-28 | 2009-07-08 | Sumco Techxiv株式会社 | Cz法単結晶インゴット製造装置及び方法 |
JP3994665B2 (ja) * | 2000-12-28 | 2007-10-24 | 信越半導体株式会社 | シリコン単結晶ウエーハおよびシリコン単結晶の製造方法 |
JP4092946B2 (ja) * | 2002-05-09 | 2008-05-28 | 信越半導体株式会社 | シリコン単結晶ウエーハ及びエピタキシャルウエーハ並びにシリコン単結晶の製造方法 |
-
2003
- 2003-06-27 JP JP2003185773A patent/JP2005015312A/ja active Pending
-
2004
- 2004-05-28 US US10/560,581 patent/US7384477B2/en not_active Expired - Fee Related
- 2004-05-28 KR KR1020057024803A patent/KR20060028424A/ko not_active Application Discontinuation
- 2004-05-28 EP EP04745386A patent/EP1640484A1/en not_active Withdrawn
- 2004-05-28 WO PCT/JP2004/007350 patent/WO2005001171A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08268794A (ja) * | 1995-03-30 | 1996-10-15 | Sumitomo Sitix Corp | 単結晶シリコン育成方法 |
JPH08330316A (ja) * | 1995-05-31 | 1996-12-13 | Sumitomo Sitix Corp | シリコン単結晶ウェーハおよびその製造方法 |
JP2000063196A (ja) * | 1998-08-18 | 2000-02-29 | Murata Mfg Co Ltd | 酸化物単結晶の製造方法 |
JP2002338389A (ja) * | 2001-05-15 | 2002-11-27 | Sumitomo Mitsubishi Silicon Corp | シリコン単結晶酸素濃度の制御方法 |
JP2003002786A (ja) * | 2001-06-25 | 2003-01-08 | Shin Etsu Handotai Co Ltd | シリコン単結晶基板、エピタキシャルウエーハおよびこれらの製造方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100288184A1 (en) * | 2006-02-21 | 2010-11-18 | Toshiaki Ono | Silicon single crystal wafer for igbt and method for manufacturing silicon single crystal wafer for igbt |
US8617311B2 (en) | 2006-02-21 | 2013-12-31 | Sumco Corporation | Silicon single crystal wafer for IGBT and method for manufacturing silicon single crystal wafer for IGBT |
Also Published As
Publication number | Publication date |
---|---|
US20070017433A1 (en) | 2007-01-25 |
KR20060028424A (ko) | 2006-03-29 |
US7384477B2 (en) | 2008-06-10 |
JP2005015312A (ja) | 2005-01-20 |
EP1640484A1 (en) | 2006-03-29 |
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