WO2022114367A1 - 실리콘 단결정 잉곳의 성장 방법 및 장치 - Google Patents
실리콘 단결정 잉곳의 성장 방법 및 장치 Download PDFInfo
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- WO2022114367A1 WO2022114367A1 PCT/KR2020/018902 KR2020018902W WO2022114367A1 WO 2022114367 A1 WO2022114367 A1 WO 2022114367A1 KR 2020018902 W KR2020018902 W KR 2020018902W WO 2022114367 A1 WO2022114367 A1 WO 2022114367A1
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- polysilicon
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 95
- 239000010703 silicon Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000013078 crystal Substances 0.000 title claims abstract description 48
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims abstract description 86
- 229920005591 polysilicon Polymers 0.000 claims abstract description 83
- 239000011261 inert gas Substances 0.000 claims abstract description 39
- 238000002844 melting Methods 0.000 claims abstract description 27
- 230000008018 melting Effects 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000009529 body temperature measurement Methods 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 90
- 229910052786 argon Inorganic materials 0.000 description 41
- 239000007789 gas Substances 0.000 description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 for example Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/16—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
- C30B15/02—Single-crystal growth by pulling from a melt, e.g. Czochralski method adding crystallising materials or reactants forming it in situ to the melt
-
- 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
- C30B15/14—Heating of the melt or the crystallised materials
-
- 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
- C30B15/30—Mechanisms for rotating or moving either the melt or the crystal
-
- 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
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/14—Feed and outlet means for the gases; Modifying the flow of the reactive gases
-
- 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
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/16—Controlling or regulating
- C30B25/165—Controlling or regulating the flow of the reactive gases
-
- 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
Definitions
- the embodiment relates to the growth of a silicon single crystal ingot, and more specifically, during the growth of a silicon single crystal ingot, argon (Ar) atoms are dissolved in a silicon melt, and pinholes are prevented from occurring in a wafer to be manufactured later. It relates to a method and apparatus for growing a silicon single crystal ingot.
- a typical silicon wafer includes a single crystal growth process for making a single crystal (ingot), a cutting process of cutting a single crystal to obtain a thin disk-shaped wafer, and damage caused by mechanical processing remaining on the wafer due to the cutting ( Damage), a polishing process for mirror-finishing the wafer, and a cleaning process for mirror-finishing the polished wafer and removing abrasives or foreign substances attached to the wafer.
- the raw material is melted by heating a growth furnace charged with high-purity silicon melt at a high temperature, and then grown by the Czochralski method (hereinafter referred to as the 'CZ' method).
- the method to be dealt with in this patent can be applied to the CZ method in which the seed crystal is positioned on top of the silicon melt to grow a single crystal.
- the CZ method uses a high-purity crucible made of quartz because it is necessary to manufacture a high-purity silicon single-crystal ingot with a good yield, and the single-crystal pulling operation is prolonged with the large diameter of the silicon single-crystal ingot.
- the conventional silicon single crystal ingot growth apparatus has the following problems.
- Si melt silicon melt
- Poly Si poly silicon
- Ar argon
- Argon atoms included in the silicon melt as described above may be included in the silicon single crystal ingot grown from the silicon melt to form voids.
- the void may form a pin hole, which may lead to a defect in the wafer.
- the embodiment is intended to provide a method and apparatus for growing a silicon single crystal ingot, in which pinholes are not formed in a manufactured wafer.
- the embodiment includes the steps of (a) introducing polysilicon into a crucible in a chamber; (b) melting the polysilicon in the crucible to form a silicon melt; (c) measuring the degree of melting of the polysilicon; and (d) increasing the supply amount of the inert gas supplied to the chamber and reducing the pressure in the chamber after the predetermined portion of the polysilicon is melted; provides a method of growing a silicon single crystal ingot comprising a .
- the method further includes (e) adding the polysilicon to the crucible after the melting of the polysilicon is finished, and in step (e), the pressure in the chamber is adjusted to the same as in step (d). can do.
- step (e) the supply amount of the inert gas supplied to the chamber may be reduced.
- the method may further include the step (f) of increasing the supply amount of the inert gas supplied to the chamber after the predetermined portion of the polysilicon input in step (e) is melted.
- the pressure in the chamber in step (f) may be the same as the pressure in the chamber in step (e).
- the degree of melting of polysilicon can be determined by measuring the surface of the silicon melt in the crucible and determining the ratio of the portion having the low surface temperature to the portion having the high surface temperature.
- the temperature of the portion having the low temperature may be 800 to 900° C., and the temperature of the portion having the high temperature may be 1000° C. or more.
- the pressure in the chamber may be adjusted through an exhaust unit below the chamber.
- the method may further include (g) rotating the crucible in a predetermined direction or in both directions after step (f).
- the amount of inert gas supplied to the chamber in step (g) and the pressure in the chamber may be the same as the amount of inert gas supplied to the chamber in step (f) and the pressure in the chamber, respectively.
- the rotation speed of the crucible may be 5 rpm or more, and the rotation time of the crucible may be 1 hour or more.
- Another embodiment is a chamber; a crucible provided in the chamber and accommodating the silicon melt; a heating unit provided in the chamber and disposed around the crucible; a heat shield provided on an upper portion of the crucible; an inert gas supply unit for supplying an inert gas to the inner region of the chamber; a temperature measuring unit for measuring a surface temperature of the silicon melt; an exhaust unit for regulating the pressure inside the chamber; a crucible rotating unit supporting and rotating the crucible; and a control unit for controlling operations of the exhaust unit, the inert gas supply unit, the temperature measurement unit, and the crucible rotation unit.
- control unit increases the supply amount of the inert gas supplied to the chamber and reduces the pressure in the chamber, the inert gas supply unit and the exhaust unit can be controlled.
- the polysilicon After the polysilicon initially introduced into the crucible is melted, the polysilicon is further added to the crucible, and the controller maintains the same pressure in the chamber when the polysilicon is additionally added and the amount of inert gas supplied to reduce the inert gas supply unit and the exhaust unit can be controlled.
- the controller may control the crucible rotating unit to rotate the crucible at a constant speed in a predetermined direction or in both directions.
- the pinhole defect rate of the manufactured wafer can be reduced by adjusting the pressure inside the chamber, the supply amount of argon, and the rotation of the crucible in the polysilicon input and melting step.
- FIG. 1 is a view showing an apparatus for growing a silicon single crystal ingot according to an embodiment of the present invention
- FIG. 2 is a view showing the action of each component in the device of Figure 1,
- FIG. 3 is a view showing a method for growing a silicon single crystal ingot according to an embodiment of the present invention
- FIG. 4 to 7 are views showing the supply and melting of polysilicon in the method of FIG. 3,
- FIGS. 8A to 8C are diagrams showing the supply amount of argon and the pressure in the chamber in the method for growing a silicon single crystal ingot according to the present invention.
- 9a to 9c are views showing the rotation of the crucible in the method for growing a silicon single crystal ingot according to the present invention.
- FIG 10 and 11 are views showing the effects of the method and apparatus for growing a silicon single crystal ingot according to the present invention.
- relational terms such as “first” and “second,” “upper” and “lower”, etc., shall not necessarily require or imply any physical or logical relationship or order between such entities or elements. In this case, it may be used only to distinguish one entity or element from another entity or element.
- FIG. 1 is a view showing an apparatus for growing a silicon single crystal ingot according to an embodiment of the present invention.
- an apparatus for growing a silicon single crystal ingot according to an embodiment of the present invention will be described with reference to FIG. 1 .
- the silicon single crystal ingot growth apparatus 1000 includes a chamber 100 in which a space for growing a silicon single crystal ingot from a silicon melt (Si melt) is formed, and the silicon melt (Si melt)
- the crucible (200, 250) for being accommodated, the heating unit (400) for heating the crucible (200, 250), and the crucible rotation unit (300) for rotating and raising the crucible (200, 250), and silicon
- a heat shield 600 positioned above the crucibles 200 and 250 to block the heat of the heating unit 400 toward the single crystal ingot, and a high temperature silicon single crystal ingot provided at the upper portion of the chamber 100 to rise
- the chamber 100 provides a space in which predetermined processes for forming a silicon single crystal ingot from a silicon melt (Si melt) are performed.
- the crucibles 200 and 250 may be provided inside the chamber 100 to contain a silicon melt (Si melt).
- the crucibles 200 and 250 may include a first crucible 200 that is in direct contact with the silicon melt, and a second crucible 250 that surrounds and supports the outer surface of the first crucible 200 .
- the first crucible 250 may be made of quartz, and the second crucible 250 may be made of graphite.
- the second crucible 250 may be divided into two or three, etc. in case the first crucible 200 is expanded by heat. For example, when the second crucible 250 is divided into two, a gap is formed between the two parts, so that even if the first crucible 200 inside is expanded, the second crucible 250 may not be damaged.
- a heat insulating material may be provided in the chamber 100 to prevent the heat of the heating unit 400 from being emitted.
- the heat shielding body 600 of the upper portion of the crucibles 200 and 250 is shown, but insulating materials may be disposed on the side and lower portions of the crucibles 200 and 250, respectively.
- the heating unit 400 may melt polycrystalline silicon supplied in the crucibles 200 and 250 to make a silicon melt (Si melt), and the heating unit 400 receives a current from a current supply rod (not shown) disposed on the upper portion of the heating unit 400 . can be supplied.
- a magnetic field generating unit (not shown) is provided outside the chamber 100 to apply a horizontal magnetic field to the crucibles 200 and 250 .
- the crucible rotation unit 300 is disposed at the center of the bottom surface of the crucibles 200 and 250 to support and rotate the crucibles 200 and 250 .
- a seed (not shown) suspended from the seed chuck 10 above the crucibles 200 and 250 is immersed in a silicon melt (Si melt), and as the silicon melt is solidified from the seed, a silicon single crystal ingot (Ingot) This can be grown.
- an inert gas for example, argon (Ar) may be supplied to the inside of the chamber 100, and in this embodiment, argon may be supplied from an inert gas supply unit (not shown).
- the inert gas supply unit may be provided outside the chamber 100 to supply argon into the chamber 100 through an opening provided in an upper region of the chamber 100 .
- Argon supplied from the inert gas supply unit is evaporated from the silicon melt (Si melt) to exhaust the oxygen remaining in the chamber 100, but may adhere to the surface of the polysilicon and seep into the silicon melt.
- an apparatus and method for growing a silicon single crystal ingot may have the following configuration.
- the temperature measuring unit 800 may be, for example, a pyrometer, and a pair may be provided in the upper portion of the chamber 100 as shown, but is not limited thereto. For example, when the temperature measuring unit 800 is provided as a pair, it may be provided at a position symmetrical with respect to the center of the chamber 100 .
- the temperature measuring unit 800 may measure the temperature of the surface of the silicon melt.
- a transparent region 110 is provided in the upper region of the chamber 100 , for example, a transparent member is disposed in the transparent region 110 , and each temperature measurement unit 800 includes a pair of transparent regions 110 . Through this, it is possible to measure the surface temperature of the silicon melt.
- FIG. 2 is a view showing the operation of each component in the apparatus of FIG. 1 .
- the silicon single crystal ingot growth apparatus 1000 includes an exhaust unit 150 and an inert gas supply unit 900 in addition to the crucible rotation unit 300 and the temperature measurement unit 800 shown in FIG. 1 .
- the operation of the exhaust unit 150 , the crucible rotation unit 300 , the temperature measurement unit 800 , and the inert gas supply unit 900 may be controlled by the control unit 700 .
- FIG. 3 is a view showing a method of growing a silicon single crystal ingot according to an embodiment of the present invention.
- a method of growing a silicon single crystal ingot using the silicon single crystal ingot growth apparatus of FIGS. 1 and 2 will be described with reference to FIG. 3 .
- polysilicon (poly Si) is put into the crucible in the chamber (S100).
- argon (Ar) may be supplied into the chamber as an inert gas, argon atoms may be adsorbed to the surface of the polysilicon in the crucible 200 as shown in FIG. 4 .
- the temperature of the crucible may be raised through a heating member, and polysilicon in the crucible may be melted to form a silicon melt (S110).
- Si melt silicon melt
- polysilicon that has not been melted may be floating on the surface of the silicon melt.
- a part of argon element may still be adsorbed on the surface of the polysilicon.
- the degree of melting of the polysilicon may be measured (S120).
- the measurement of the degree of melting of polysilicon may be determined through the ratio of a portion having a low surface temperature to a portion having a high surface temperature on the surface of the silicon melt through the above-described temperature measurement unit or the like. Since the temperature of the polysilicon in the solid state is much lower than the temperature of the silicon melt in the liquid state, when the surface temperature inside the crucible is measured through a temperature measuring unit, the temperature at which the low-temperature polysilicon floats between the high-temperature silicon melts. The distribution shape can be measured.
- the temperature of the low-temperature portion ie, the low-temperature polysilicon
- the temperature of the high-temperature portion ie, the silicon melt
- the temperature of the high-temperature portion ie, the silicon melt
- the amount of argon gas supplied to the chamber may be increased and the pressure in the chamber may be reduced ( S130 ).
- the case where the predetermined portion of polysilicon is measured as molten means that it is difficult to actually measure the weight of the molten portion of the polysilicon, so the temperature inside the crucible 200 is measured through the temperature measurement unit.
- the surface area of the low-temperature polysilicon among the inner surfaces of the crucible 200 is less than a certain portion, it can be estimated that a predetermined portion of the polysilicon is molten, for example, low-temperature polysilicon among the inner surfaces of the crucible 200 . It can be judged that the condition is achieved when the surface area of is 10% or less.
- the argon gas may be discharged from the surface to the surface adjacent region of the silicon melt by increasing the supply amount or speed of the argon gas.
- the other atom may be carbon or oxygen.
- carbon it may be introduced into the silicon melt from various components in the chamber 100
- oxygen it may be introduced into the silicon melt from quartz in the crucible 200 .
- carbon or oxygen introduced into the silicon melt may be introduced into the silicon single crystal ingot according to the rotation of the crucible and the seed, it may be discharged to the outside through the above-described increase in the supply amount of argon gas and decrease in pressure in the chamber.
- Adjustment of the supply amount of argon and the pressure inside the chamber may be made by controlling the operations of the inert gas supply unit 900 and the exhaust unit 150 in the control unit 700 of FIG. 2 .
- the size of the polysilicon supply device may not be sufficient to input too much polysilicon at once.
- polysilicon is transferred from the polysilicon supply device to the silicon melt in the crucible It can be additionally input to (S140). That is, as shown in FIG. 7 , poly Si may be additionally supplied to the silicon melt in the crucible 200 .
- the pressure in the chamber proceeds in the same manner as in step S130, but the supply amount of argon, which is an inert gas, may be reduced. And, the reduced supply amount of argon may be the same as the supply amount of argon in S120.
- step S150 the degree of melting of polysilicon is measured, and when it is determined that a predetermined portion of polysilicon is melted, the amount of argon gas supplied to the chamber is increased, and the pressure in the chamber is kept constant. can be maintained (S150).
- step S140 it is possible to reduce the supply of argon gas in order to release the argon atoms adsorbed to the surface and polysilicon of the silicon melt in step S140.
- steps S130 and S150 The reason for increasing the supply of argon in steps S130 and S150 is that when most of the polysilicon is melted, the temperature inside the chamber and the silicon melt increases, so that the active argon atoms are more likely to be trapped on the surface of the silicon melt, This is to strongly supply argon gas and discharge it to the outside. In addition, when a large amount of polysilicon remains without melting, argon gas is highly likely to be collected by colliding with the polysilicon mass, so that argon gas is not supplied or the supply amount is reduced.
- the reason for maintaining the constant pressure in the chamber after step S130 is that argon gas is already sufficiently present in the chamber, so that the argon gas is smoothly exhausted.
- a stabilization step may be performed. For example, by rotating the crucible (S160), the silicon melt in the crucible may be stabilized, and at this time, the temperature or convection state in the silicon melt may be stabilized.
- the amount of the inert gas supplied to the chamber and the pressure in the chamber in step S160 may be the same as the amount of inert gas supplied to the chamber and the pressure in the chamber in step S150, respectively.
- the rotation speed of the crucible may be 5 rpm or more
- the rotation time of the crucible may be 1 hour or more
- the rotation direction may be in a constant direction or in both directions.
- FIGS. 8A to 8C are views showing the supply amount of argon and the pressure in the chamber in the method for growing a silicon single crystal ingot according to the present invention, and FIGS. the drawing shown.
- FIGS. 8A and 9A show the primary supply and melting stages of polysilicon
- FIGS. 8B and 9B show secondary and tertiary supply and melting stages of polysilicon
- FIGS. 8C and 9C show the stabilization process.
- the numerical values of the horizontal axis and the vertical axis may be arbitrary, and an increase/decrease relationship should be noted.
- the crucible in the first supply and melting stage of polysilicon, the crucible does not rotate, the pressure in the chamber decreases after a certain time, and the supply amount of argon increases after a certain time, at this time It may be when it is measured that most of the polysilicon supplied as poly is melted.
- the supply amount of argon supplied to the chamber is repeatedly increased and decreased. After most of the melting of polysilicon is completed, while polysilicon is additionally supplied, the supply amount of argon gas decreases again, and additional supply After most of the melting of the polysilicon is completed, the supply amount of argon may be increased again.
- polysilicon is additionally supplied twice in FIG. 8B .
- the pressure in the chamber in FIG. 8B rises after the melting of the polysilicon initially input in FIG. 8A is finished, and is maintained constant in FIG. 8B .
- the crucible rotates weakly during the additional supply and melting step of polysilicon in FIG. 9B , but the present invention is not limited thereto and may not rotate.
- the supply amount of argon gas is the same as the supply amount increased in the second half of FIG. 8A , and may be kept constant. And, in FIG. 8C , the pressure in the chamber may be maintained constant.
- FIG 10 and 11 are views showing the effects of the method and apparatus for growing a silicon single crystal ingot according to the present invention.
- the horizontal axis represents Comparative Examples and Examples
- the vertical axis represents the defective rate.
- the defective rate of the manufactured wafer that is, the pinhole generation degree
- the pressure and the argon supply amount are adjusted according to the comparative example. It can be seen that it is significantly reduced.
- the horizontal axis represents the length of the ingot in the axial direction
- the vertical axis represents the concentration (ppma) of carbon (C) in the portion of the ingot.
- the apparatus and method according to the embodiment may be used for growth of a silicon single crystal ingot.
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Abstract
Description
Claims (15)
- 챔버 내의 도가니에 폴리 실리콘을 투입하는 (a) 단계;상기 도가니의 폴리 실리콘을 용융하여 실리콘 융액(melt)을 형성하는 (b) 단계;상기 폴리 실리콘의 용융 정도를 측정하는 (c) 단계; 및상기 폴리 실리콘의 기설정된 부분이 용융된 이후, 상기 챔버에 공급되는 비활성 기체의 공급량을 증가시키고, 상기 챔버 내의 압력을 감소시키는 (d) 단계;를 포함하는 실리콘 단결정 잉곳의 성장 방법.
- 제1 항에 있어서,상기 폴리 실리콘의 용융 종료 후에, 상기 폴리 실리콘을 상기 도가니에 추가로 투입하는 (e) 단계를 더 포함하고,상기 (e) 단계에서, 상기 챔버 내의 압력을 상기 (d) 단계와 동일하게 하는 방법.
- 제2 항에 있어서,상기 (e) 단계에서, 상기 챔버에 공급되는 비활성 기체의 공급량을 감소시키는 방법.
- 제2항 또는 제3 항에 있어서,상기 (e) 단계에서 투입된 상기 폴리 실리콘의 기설정된 부분이 용융된 이후, 상기 챔버에 공급되는 비활성 기체의 공급량을 증가시키는 (f) 단계를 더 포함하는 방법.
- 제4 항에 있어서,상기 (f) 단계에서 상기 챔버 내의 압력을 상기 (e) 단계에서 상기 챔버 내의 압력과 동일하게 하는 방법.
- 제1 항에 있어서,상기 폴리 실리콘의 용융 정도의 측정은,상기 도가니의 실리콘 융액의 표면을 측정하여, 표면 온도가 낮은 부분과 표면 온도가 높은 부분의 비율을 통하여 판단하는 방법.
- 제6 항에 있어서,상기 온도가 낮은 부분의 온도는 800~900℃이고, 상기 온도가 높은 부분의 온도는 1000℃이상인 방법.
- 제1 항에 있어서,상기 챔버 내의 압력을, 상기 챔버 하부의 배기 유닛을 통하여 조절하는 방법.
- 제4 항에 있어서,상기 (f) 단계 이후에, 상기 도가니를 일정 방향 또는 양방향으로 회전시키는 (g) 단계를 더 포함하는 방법.
- 제9 항에 있어서,상기 (g) 단계에서의 상기 챔버에 공급되는 비활성 기체의 양과 상기 챔버 내의 압력을, 상기 (f) 단계에서의 상기 챔버에 공급되는 비활성 기체의 양과 상기 챔버 내의 압력과 각각 동일하게 하는 방법.
- 제9 항에 있어서,상기 도가니의 회전 속도는 5 rpm 이상이고, 상기 도가니의 회전 시간은 1시간 이상인 방법.
- 챔버;상기 챔버의 내부에 구비되고, 실리콘 용융액이 수용되는 도가니;상기 챔버의 내부에 구비되고, 상기 도가니의 둘레에 배치되는 가열부;상기 도가니의 상부에 구비되는 열차폐체;상기 챔버의 내부 영역으로 비활성 기체를 공급하는 비활성 기체 공급 유닛;상기 실리콘 용융액의 표면 온도를 측정하는 온도 측정 유닛;상기 챔버 내부의 압력을 조절하는 배기 유닛;상기 도가니를 지지하고 회전시키는 도가니 회전 유닛; 및상기 배기 유닛과 비활성 기체 공급 유닛과 온도 측정 유닛 및 도가니 회전 유닛의 작동을 제어하는 제어부를 포함하는 실리콘 단결정 잉곳의 성장 장치.
- 제12 항에 있어서,상기 도가니에 초기에 투입된 폴리 실리콘의 기설정된 부분이 용융된 이후에,상기 제어부는, 상기 챔버에 공급되는 비활성 기체의 공급량을 증가시키고 상기 챔버 내의 압력을 감소시키도록, 상기 비활성 기체 공급 유닛 및 배기 유닛을 제어하는 실리콘 단결정 잉곳의 성장 장치.
- 제12 항 또는 제13 항에 있어서,상기 도가니에 초기에 투입된 폴리 실리콘의 용융 종료 후에, 상기 폴리 실리콘을 상기 도가니에 추가로 투입하고,상기 제어부는, 상기 폴리 실리콘의 추가 투입시에, 상기 챔버 내의 압력을 동일하게 유지하고 비활성 기체의 공급량을 감소시키도록, 상기 비활성 기체 공급 유닛 및 배기 유닛을 제어하는 실리콘 단결정 잉곳의 성장 장치.
- 제14 항에 있어서,상기 도가니에 추가로 투입된 폴리 실리콘의 용융이 종료된 후,상기 제어부는 상기 도가니를 일정 방향 또는 양방향으로 일정 속도로 회전시키도록 상기도가니 회전 유닛을 제어하는 실리콘 단결정 잉곳의 성장 장치.
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