WO2022216105A1 - 기판 처리 방법 및 기판 처리 장치 - Google Patents
기판 처리 방법 및 기판 처리 장치 Download PDFInfo
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- WO2022216105A1 WO2022216105A1 PCT/KR2022/005103 KR2022005103W WO2022216105A1 WO 2022216105 A1 WO2022216105 A1 WO 2022216105A1 KR 2022005103 W KR2022005103 W KR 2022005103W WO 2022216105 A1 WO2022216105 A1 WO 2022216105A1
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- chamber
- substrate
- cleaning
- gas
- growth
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- 239000000758 substrate Substances 0.000 title claims abstract description 142
- 238000003672 processing method Methods 0.000 title claims abstract description 15
- 238000004140 cleaning Methods 0.000 claims abstract description 151
- 238000000034 method Methods 0.000 claims abstract description 151
- 239000010409 thin film Substances 0.000 claims abstract description 55
- 239000010408 film Substances 0.000 claims abstract description 50
- 238000009616 inductively coupled plasma Methods 0.000 claims abstract description 16
- 238000005507 spraying Methods 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims description 28
- 239000006227 byproduct Substances 0.000 claims description 12
- 239000007789 gas Substances 0.000 description 99
- 238000002347 injection Methods 0.000 description 17
- 239000007924 injection Substances 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 15
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 9
- 229910052731 fluorine Inorganic materials 0.000 description 9
- 239000011737 fluorine Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000003028 elevating effect Effects 0.000 description 3
- -1 that is Substances 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910003902 SiCl 4 Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000005406 washing Methods 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
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/10—Heating of the reaction chamber or the substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
-
- 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
Definitions
- the present invention relates to a substrate processing method and a substrate processing apparatus, and more particularly, to a substrate processing method and a substrate processing apparatus capable of improving thin film quality.
- a process of manufacturing a semiconductor device includes a growth process by selectively growing an epitaxial layer on a substrate.
- a pattern film made of an oxide, for example, SiO 2 is formed on a portion of the upper surface of the substrate.
- the process gas is injected, selective growth in which a thin film is formed in an exposed region of the upper surface of the substrate without a pattern film being formed is performed.
- a native oxide film may be formed on the upper surface of the substrate while the substrate is moved or waiting for the growth process to be performed. That is, a natural oxide layer may be formed in an exposed region of the upper surface of the substrate where the pattern layer is not formed.
- impurities may be deposited on the pattern layer during a growth process of injecting a process gas to the substrate.
- the natural oxide film and impurities as described above act as factors hindering selective growth. Accordingly, a thin film having a target thickness may not be formed or the thickness uniformity of the thin film may be deteriorated, which may deteriorate the performance of the semiconductor device.
- Patent Document 1 Korean Patent 10-1728072
- the present invention provides a substrate processing method and substrate processing apparatus capable of improving the quality of a thin film.
- the present invention provides a substrate processing method and a substrate processing apparatus capable of improving a cleaning speed of a substrate.
- a substrate processing method a preparation step of seating a substrate on a support inside a chamber; a first cleaning step including removing a native oxide film on the substrate by spraying a first cleaning gas into the chamber; a growth step of growing a thin film in a growth region of one surface of the substrate by spraying a process gas into the chamber; and generating an inductively coupled plasma in the chamber in the first cleaning step, wherein the temperature inside the chamber is 300°C to 750°C.
- the first cleaning step may further include removing by-products generated in the step of removing the native oxide layer by injecting a second cleaning gas different from the first cleaning gas into the chamber.
- the second cleaning step may include generating an inductively coupled plasma in the chamber.
- the chamber cleaning step includes: It may include a step of spraying.
- the cleaning of the chamber may include generating an inductively coupled plasma in the chamber.
- the intensity of the RF power applied to the plasma generator outside the chamber for generating inductively coupled plasma in the chamber cleaning step may be different from the intensity of the RF power applied in the first and second cleaning steps.
- the growth step and the second washing step may be alternately performed a plurality of times.
- a substrate processing apparatus includes a chamber; a support installed inside the chamber to support the substrate; a plasma generating unit installed outside the chamber to generate inductively coupled plasma in the chamber; and a control unit for controlling the operation of the plasma generator so that an inductively coupled plasma can be generated inside the chamber in a first cleaning process of spraying a first cleaning gas into the chamber before a growth process of growing a thin film on the substrate; Including, the temperature inside the chamber may include that of 300 °C to 750 °C.
- the control unit may control the operation of the plasma generator so that an inductively coupled plasma can be generated inside the chamber in a second cleaning process of injecting a second cleaning gas different from the first cleaning gas into the chamber after the growth process.
- the control unit may apply any one of the first RF power and the second RF power having different intensities to the plasma generator.
- a cleaning process of removing the oxide film formed on the growth region of the substrate is performed before the growth process. Accordingly, the selective growth process can be easily performed on the substrate, and the quality of the thin film can be improved.
- the process gas is sprayed a plurality of times with a time difference to perform a plurality of growth processes, and a cleaning process for removing impurities deposited on the pattern film is performed between the growth processes. Accordingly, the selective growth process can be easily performed during the next growth process, and the quality of the thin film can be improved.
- FIG. 1 is a diagram illustrating a substrate processing apparatus according to an embodiment of the present invention.
- FIG. 2 is a diagram conceptually illustrating, for example, a substrate to be processed by a substrate processing apparatus according to an embodiment of the present invention.
- FIG. 3 is a flowchart illustrating a substrate processing method according to an embodiment of the present invention.
- 4 to 8 are process diagrams illustrating a substrate processing method according to an embodiment of the present invention.
- the substrate processing apparatus will be described as an apparatus for selectively growing an epitaxial layer thin film on a substrate.
- 1 is a diagram illustrating a substrate processing apparatus according to an embodiment of the present invention.
- 2 is a diagram conceptually illustrating, for example, a substrate to be processed by a substrate processing apparatus according to an embodiment of the present invention.
- a substrate processing apparatus includes a chamber 100 having an internal space, a support 200 installed in the chamber 100 to support a substrate S, and a chamber 100 .
- the injection unit 300 installed in the chamber 100 to inject gas into the interior, the plasma generation unit 400 and the plasma generation unit located outside the chamber 100 to generate plasma inside the chamber 100 ( It may include a control unit 700 for controlling the operation of the 400).
- the heating unit 500 installed to face the support 200 , the driving unit 600 for elevating or rotating the support 200 , and gas and impurities in the chamber 100 are exhausted. It may include an exhaust unit (not shown).
- the substrate S to be processed in such a substrate processing apparatus may be, for example, a wafer. More specifically, the substrate S may be a Si wafer, and as shown in FIG. 2 , a thin film (hereinafter, a pattern film P) made of an oxide such as SiO 2 is formed on the Si wafer.
- a pattern film P made of an oxide such as SiO 2 is formed on the Si wafer.
- the substrate S may be in a state in which the pattern layer P made of SiO 2 is discontinuously formed on the upper surface thereof. Accordingly, a portion of the upper surface of the substrate may be covered by the SiO 2 pattern layer P, and the rest may be exposed.
- the substrate (S) selective growth in which the thin film (L) is grown in the region where the pattern film (P) is not formed on the upper surface is made.
- the process of selectively growing the thin film L on the substrate S will be described in detail again later.
- the substrate S is not limited to the Si wafer, and may be variously changed to a Ge wafer, a SiGe wafer, or the like.
- the substrate S is not limited to a wafer and may be variously changed, such as glass, plastic, film, or metal.
- the chamber 100 may include a chamber body 110 , an upper body 120 installed on an upper portion of the chamber body 110 , and a lower body 130 installed on a lower portion of the chamber body 110 .
- the chamber body 110 may have an open tubular shape with upper and lower portions, the upper body 120 is installed to cover the upper opening of the chamber body 110 , and the lower portion to cover the lower opening of the chamber body 110 .
- the body 130 may be installed.
- the upper body 120 may have a dome shape having an inclined surface whose height increases toward the center in the width direction.
- Each of these chambers 100 that is, the chamber body 110, the upper body 120, and the lower body 130, may be made of a transparent material through which light can pass, and may be made of, for example, quartz.
- the support 200 is a means by which the substrate S is supported on one surface, for example, an upper surface, and may be installed inside the chamber 100 .
- the support 200 may be provided to have a larger area than the substrate S, and may be provided in a shape corresponding to the substrate S, for example, a rectangular or circular shape.
- the support 200 may be provided to have the same area as the substrate (S) or to have a smaller area than the substrate (S).
- the driving unit 600 may be a means for operating the support 200 by at least one of elevating, lowering, and rotating.
- the driving unit 600 is installed outside the lower part of the chamber 100 to provide a driving source 610 that provides at least one power of elevating and rotating, and a driving shaft having one end connected to the support 200 and the other end connected to the driving source 610 .
- 620 may be included. According to the driving unit 600 , the driving shaft 620 and the support 200 connected thereto for the operation of the driving source 610 may operate by at least one of elevation and rotation.
- the heating unit 500 is a means for heating the inside and the support 200 of the chamber 100 , and may be installed outside the chamber 100 . More specifically, the heating unit 500 may be installed so that at least a portion of the lower side outside the chamber 100 may face the support 200 .
- the heating unit 500 may be a means including a plurality of lamps, and the plurality of lamps may be installed to be arranged in a width direction of the support 200 . And the plurality of lamps may include lamps such as halogen that emits radiant heat.
- the injector 300 injects gas toward the substrate S seated on the support 200 inside the chamber 100 .
- the injection unit 300 may be installed in the chamber 100 so that one end to which the gas is injected may be located inside the chamber 100 .
- the injection unit 300 may be installed on the side of the chamber 100 , for example, on the chamber body 110 , as shown in FIG. 1 , and may be in the form of a pipe through which gas can pass.
- the injection unit 300 may be provided to be inclined upward so that its height increases toward one end at which the gas is injected.
- the installation position, arrangement, shape, etc. of the injection unit 300 are not limited to the above-described example and may be variously modified. That is, the injection unit 300 may be installed in any position as long as one end to which the gas is injected can face the support 200 , for example, it may be installed in the upper body 120 of the chamber 100 . In addition, the injection unit 300 may be provided in a horizontal state without being inclined upward, and may be deformed into various shapes capable of injecting gas toward the substrate S without being limited to a pipe shape.
- the gas injected from the injection unit 300 is a gas for forming, forming, or growing a thin film L on the substrate S (hereinafter, a process gas), the substrate S or for cleaning the inside of the chamber 100 . It may be a gas (hereinafter, a cleaning gas).
- the process gas is a gas injected to grow the thin film L on the substrate S, and may vary depending on the type of the substrate S or the thin film to be grown.
- the process gas may be a gas containing Si.
- the process gas may be a gas containing Ge.
- the process gas may be a gas containing Si or a gas containing Ge.
- the gas containing Si is Si 2 H 6 and At least one of SiH 4 may be included.
- the gas containing Ge may include GeH 4 .
- a gas for doping for example, a gas containing B (boron) may be further injected through the injection unit 300 .
- the gas containing B (boron) may include, for example, B 2 H 6 .
- a pattern film P in the form of a thin film made of oxide, for example, SiO 2 is formed on a part of the upper surface of the substrate S as shown in FIG. 2 . Accordingly, a portion of the upper surface of the substrate S facing the injection unit 300 is covered by the pattern film P, and the rest is exposed.
- the pattern layer P made of oxide may be a masking means for preventing or preventing deposition or growth. That is, the pattern film P may be a means for selective growth or film formation. Accordingly, when a process gas, for example, a gas containing Si 2 H 6 is injected from the injection unit 300 , Si 2 H 6 is decomposed or dissociated by the heat inside the chamber 100 , and the decomposed Si is on the substrate S is deposited on That is, Si is deposited on an exposed region (hereinafter, referred to as a growth region DA) of the upper surface of the substrate S where the pattern film P is not formed, and a thin film L made of Si is grown or formed. . In other words, selective growth in which Si is deposited in a growth region in which the pattern layer P is not formed among the upper surface of the substrate S may be performed.
- a process gas for example, a gas containing Si 2 H 6 is injected from the injection unit 300 , Si 2 H 6 is decomposed or dissociated by the heat inside the
- the growth region DA of the substrate S is oxidized, so that a thin oxide film, that is, a native oxide film, may be formed in the growth region DA. That is, the growth region DA may be oxidized while the substrate S is moved to the chamber or while waiting outside the chamber 100 to form a native oxide layer.
- This native oxide film acts as a factor hindering the growth or film formation of the thin film. Accordingly, it is necessary to remove the native oxide film formed in the growth region DA of the substrate S before performing the growth process.
- impurities may remain on the pattern film P. That is, a small amount of a material derived from the process gas may be attached to and remain on the pattern film P as well as the growth region DA of the substrate S. In this case, the remaining material on the pattern film P is an impurity.
- the process gas contains Si 2 H 6
- a thin film made of Si is deposited on the growth region DA of the substrate S
- a small amount of Si is attached to the upper portion of the pattern film P and may remain.
- the residue on the pattern layer P ie, Si, acts as an impurity that prevents selective growth in the next growth process. Accordingly, it is preferable to remove impurities such as Si remaining on the pattern layer P.
- a cleaning process (hereinafter, the first cleaning process) of removing the native oxide film formed in the growth area DA of the substrate S is performed. ) and, after the growth process, a cleaning process (hereinafter, referred to as a second cleaning process) for removing impurities remaining on the upper portion of the pattern film P is performed.
- the cleaning gas injected in the first cleaning process may include the first cleaning gas.
- the cleaning gas injected in the first cleaning process may further include a second cleaning gas, which is a gas of a material different from that of the first cleaning gas.
- the gas injected in the second cleaning process may include the second cleaning gas.
- the first cleaning gas may include SF 6
- the second cleaning gas may include Cl 2 .
- by-products resulting from the process gas may be generated inside the chamber 100 , and these by-products are the inner wall of the chamber 100 and the support 200 .
- a by-product made of Si may be deposited on the inner wall of the chamber 100 and the surface of the support 200 .
- These by-products may act as impurities that deteriorate the quality of the thin film (L) or the product. Accordingly, it is preferable to perform a cleaning process to remove impurities inside the chamber 100 .
- the chamber 100 After performing the substrate processing process a plurality of times, before loading the substrate S into the chamber 100 or after the substrate S inside the chamber 100 is carried out, the chamber 100 ) to clean the inside.
- the second cleaning gas containing Cl 2 may be sprayed through the injection unit 300 to perform cleaning.
- the plasma generator 400 is provided on the upper portion of the chamber 100 , that is, the upper body 120 , and ionizes the gas supplied into the chamber 100 to generate plasma.
- the plasma generator 400 may be a means for generating an inductively coupled plasma (ICP). That is, the plasma generator 400 includes an antenna having a coil 410 for inducing an electric field in the chamber 100 as shown in FIG. 1 and a power supply unit 420 connected to the coil 410 to apply RF power. can do.
- ICP inductively coupled plasma
- the coil 410 may be installed on the upper body 120 .
- the coil 410 may be provided in a spiral wound with a plurality of turns, or may have a configuration including a plurality of circular coils arranged in a concentric circle shape and connected to each other.
- the coil 410 is not limited to a spiral coil or a concentric circular coil, and various coils having different shapes may be applied.
- the coil 410 may have a multi-layer structure including a lower coil installed adjacent to the upper portion of the upper body 120 and an upper coil spaced apart from the upper coil of the lower coil.
- the coil 410 may be made of a conductive material such as copper, and may have a hollow tube shape. When the coil 410 is manufactured in a tubular shape, since cooling water or refrigerant may flow, it is possible to suppress the temperature rise of the coil.
- both ends of the coil 410 may be connected to the power supply unit 420 , and the other end may be connected to a ground terminal. Therefore, when RF power is applied to the coil through the power supply unit 420 , the gas injected into the chamber 100 is ionized or discharged to generate plasma in the chamber 100 .
- the controller 700 may control the operation of the plasma generator 400 . More specifically, the control unit 700 may operate the plasma generating unit 400 to generate plasma in the chamber 100 in at least one of the first cleaning process and the second cleaning process.
- control unit 700 performs a process of cleaning the inside of the chamber 100 before loading the substrate S into the chamber 100 or after removing the processed substrate S from the chamber 100 .
- the plasma generating unit 400 may be controlled to generate plasma in the chamber 100 .
- the control unit 700 may adjust the intensity of the RF power applied to the power supply unit 420 of the plasma generator 400 during the chamber cleaning process to be different from the intensity of the RF power applied during the first and second cleaning processes. .
- the controller may adjust the intensity of the RF power applied to the power supply unit 720 during the cleaning process to be greater than the intensity of the RF power applied during the first and second cleaning processes.
- the control unit 700 is different from the intensity of the first RF power applied during the first and second cleaning process and the intensity of the second RF power applied during the chamber cleaning process, compared to the intensity of the first RF power The intensity of the second RF power may be increased.
- FIG. 3 is a flowchart illustrating a substrate processing method according to an embodiment of the present invention.
- 4 to 8 are process diagrams illustrating a substrate processing method according to an embodiment of the present invention.
- the substrate is a Si wafer, and a method of growing a thin film made of Si in the growth region of the substrate will be described as an example.
- the support 200 is heated to a temperature for a process (hereinafter, a process temperature), for example, 550°C.
- a process temperature for example, 550°C.
- the substrate S is loaded into the chamber 100, and the substrate S is seated on the support 200 (preparation step).
- the pressure inside the chamber 100 may be set or controlled in a pressure range of several mtorr or less, or several tens of mtorr or less, or several hundred mtorr or less. And, in at least one of the first cleaning process (S100), the growth process (S200), and the second cleaning process (S300), the pressure inside the chamber 100 is set to several mtorr or less, or several tens of mtorr or less, or several hundred mtorr or less.
- the pressure range can be set or controlled.
- the temperature inside the chamber 100 before or after the substrate S is seated on the support 200 is set at 300° C. to 750° C. (300° C. or more and 750° C. or less), preferably 400° C. to 600° C. (400 °C or higher and 600°C or lower) can be set or controlled.
- the temperature inside the chamber 100 is set at 300°C to 750°C.
- 400°C to 600°C. °C can be set or controlled.
- the temperature inside the chamber 100 may be set or controlled using the heating unit 500 .
- a first cleaning process including a process S110 of removing the natural oxide film NO formed on the substrate S is performed ( S100 ).
- the gas containing the first cleaning gas for example, SF 6 is injected through the injection unit 300 as shown in FIG. 4 .
- RF power is applied to the power supply unit 720 of the plasma generating unit 400 through the control unit 700 to generate plasma in the chamber 100 .
- the control unit 700 may adjust the intensity of the RF power applied to the coil 410 through the power supply unit 420 , that is, the power to be, for example, 60W to 1000W.
- the first cleaning gas containing SF 6 When the first cleaning gas containing SF 6 is injected into the chamber 100 , SF 6 and the natural oxide film are generated by the heat inside the chamber 100 by the support 200 and the plasma generated by the plasma generator 400 . (NO) reacts. That is, SF 6 and oxygen (O) of the natural oxide film (NO) reacts to generate SO 2 . And the reaction product SO 2 may be discharged to the outside through the exhaust. Accordingly, the native oxide film NO formed on the substrate S is removed.
- the pattern film P made of oxide as well as the natural oxide film NO formed in the growth region DA of the substrate S. It may also react with the first cleaning gas. Accordingly, a portion of the pattern layer P may also be partially etched by the first cleaning gas. However, since the native oxide layer NO is very thin and the pattern layer P has a thick thickness, the thickness of the pattern layer P etched by the first cleaning gas may be small. Accordingly, when the native oxide layer NO formed on the growth region DA is removed by the first cleaning gas, the pattern layer P remains (see FIG. 5 ).
- the plasma is generated by operating the plasma generating unit 400 while injecting the first cleaning gas into the chamber 100 . That is, in addition to heating the support 200 inside the chamber 100, plasma is further generated inside the chamber 100 .
- plasma is generated inside the chamber 100 in this way, the reaction rate between the first cleaning gas and the native oxide layer NO is improved. That is, when plasma is generated, the decomposition rate of SF 6 is faster than in the case where plasma is not generated, and accordingly, the reaction rate with the native oxide film (NO) is fast. Therefore, when plasma is generated, the reaction rate can be improved compared to the case where plasma is not generated. Accordingly, the first cleaning process time for removing the native oxide layer NO formed in the growth region DA of the substrate S may be shortened, and cleaning efficiency may be improved.
- reaction by-products including components decomposed from the first cleaning gas may be generated. That is, when SF 6 of the first cleaning gas and the natural oxide film (NO) react to generate SO 2 , fluorine (F) is decomposed from the first cleaning gas, and reaction by-products containing fluorine (F) are generated in the chamber. (100) may remain inside. And the fluorine (F) inside the chamber 100 may reduce the quality of the thin film (L) or the product. Accordingly, it is preferable to remove (S120) the reaction by-product, that is, fluorine (F) remaining in the chamber 100 after removing the native oxide layer (NO) (S110).
- the second cleaning gas containing Cl 2 is injected into the chamber 100 through the injection unit 300 as shown in FIG. 5 .
- the control unit 7000 may adjust the power applied to the coil 410 through the power supply unit 420 to be the same as when the first cleaning gas is injected, and may be, for example, 60W to 1000W.
- the reaction rate between the second cleaning gas and the fluorine (F) is improved. That is, when plasma is generated, the decomposition rate of Cl 2 is faster than that of the case where plasma is not generated, and thus the reaction rate with fluorine (F) in the chamber 100 is fast. Therefore, when plasma is generated, the reaction rate can be improved compared to the case where plasma is not generated. Accordingly, it is possible to shorten the process time for removing the reaction by-product, that is, fluorine (F) remaining in the chamber 100 after the first cleaning process, and it is possible to improve the cleaning efficiency.
- a growth process of forming a thin film on the growth area DA of the substrate S is performed (S200).
- a process gas for example, a gas containing Si 2 H 6 is injected through the injection unit 300 as shown in FIG. 6 .
- Si is decomposed or dissociated from Si 2 H 6 of the process gas by heat inside the chamber 100 , and the decomposed Si is deposited in the growth region DA of the substrate S. Accordingly, a thin film (primary thin film L 1 ) made of Si is formed on the growth region DA of the substrate S as shown in FIG. 6 .
- a small amount of a material resulting from the process gas may remain attached to the pattern film P as well as the growth area DA of the substrate S.
- a process gas containing Si 2 H 6 is injected and a thin film made of Si is deposited on the growth area DA of the substrate S, a small amount of Si may remain attached to the upper portion of the pattern film P. can In this way, the Si remaining on the pattern layer P acts as an impurity in the next growth process. Accordingly, when the growth process is completed, a second cleaning process ( S300 ) of removing the impurities (I) remaining on the pattern layer (P) is performed.
- the second cleaning gas for example, a gas containing Cl 2 is injected through the injection unit 300 as shown in FIG. 7 .
- RF power is applied to the power supply unit 420 of the plasma generation unit 400 through the control unit 700 to generate plasma in the chamber 100 .
- the control unit 700 controls the RF power applied to the coil 410 through the power supply unit 420 , that is, the power to be, for example, 60W to 1000W.
- the second cleaning gas When the second cleaning gas is injected into the chamber 100, not only the impurities remaining on the upper portion of the pattern film P, but also the primary thin film L 1 formed in the growth region DA of the substrate S is removed. 2Can react with cleaning gas. Accordingly, a portion of the first thin film L 1 may also be partially etched by the second cleaning gas. However, since the impurity (I) has a very thin thickness and the primary thin film (L 1 ) is relatively thick, the thickness of the primary thin film (L 1 ) etched by the second cleaning gas may be small. have. Accordingly, when the impurity I on the pattern layer P is etched or removed by the second cleaning gas, the primary thin film L 1 remains.
- the reaction rate between the second cleaning gas and the impurities I is improved. That is, when plasma is generated, the decomposition rate of Cl 2 is faster than in the case where plasma is not generated, and accordingly, the reaction rate with the impurity (I) on the pattern layer (P) is fast. Therefore, when plasma is generated, the reaction rate can be improved compared to the case where plasma is not generated. Accordingly, the second cleaning process time can be reduced, and the second cleaning process time can be shortened compared to the process time. That is, the second cleaning process may be performed for a shorter time than the growth process time. Accordingly, cleaning efficiency can be improved, the overall process time can be shortened, and damage to the substrate or thin film due to the second cleaning process time can be prevented.
- the above-described growth process (S200) is performed in the same manner. Accordingly, as shown in FIG. 8 , the secondary thin film L 2 is formed on the primary thin film L 1 . In addition, impurities I may adhere or remain on the pattern film P during the growth process S200 of forming the secondary thin film L 2 on the primary thin film L 1 . Accordingly, when the growth process (S200) for forming the secondary thin film is completed, the second cleaning process (S300) is performed in the same manner as the above-described method.
- the growth process (S200) and the second cleaning process (S300) are alternately repeated a plurality of times until a thin film of a target thickness is formed on the growth area (DA) of the substrate (S). . Accordingly, a thin film having a target thickness is grown on the growth area DA of the substrate S as shown in FIG. 2 .
- a process of cleaning the inside of the chamber 100 is performed. That is, the interior of the chamber 100 is cleaned before the substrate S is brought into the chamber 100 or after the substrate S inside the chamber 100 is taken out.
- the second cleaning gas containing Cl 2 is injected into the chamber 100 through the injection unit 300 , and RF power is applied to the power supply unit 420 of the plasma generation unit 400 to generate plasma.
- the control unit 700 adjusts the intensity of the RF power applied to the coil 410 through the power supply unit 420 , that is, the power to be greater than the power applied during the first cleaning process and the second cleaning process.
- a first cleaning process of removing the native oxide film NO formed on the growth region DA of the substrate S is performed before the growth process. Accordingly, the selective growth process can be easily performed on the substrate S, and the quality of the thin film can be improved.
- a second cleaning process of removing impurities I remaining on the pattern film P is performed between the growth processes. Accordingly, the selective growth process can be easily performed during the next growth process, and the quality of the thin film can be improved.
- the first cleaning process rate for removing the natural oxide film on the substrate S and the second cleaning process rate for removing impurities on the pattern film P can be improved, and the cleaning efficiency can be improved have. Accordingly, the overall substrate processing speed can be improved.
- the pressure inside the chamber 100 is set or controlled in a pressure range of several mtorr or less, or several tens of mtorr or less, or several hundred mtorr or less. can Accordingly, at least one of the first cleaning process, the second cleaning process, and the growth process can be easily performed at a lower temperature than in the related art.
- the concentration of impurities such as oxygen in the chamber 100 can be lowered, and accordingly It is possible to improve the quality of the thin film.
- a cleaning process of removing the oxide film formed on the growth region of the substrate is performed before the growth process. Accordingly, the selective growth process can be easily performed on the substrate, and the quality of the thin film can be improved.
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Abstract
Description
Claims (11)
- 챔버 내부의 지지대 상에 기판을 안착시키는 준비단계;상기 챔버 내부로 제1세정가스를 분사하여, 상기 기판 상의 자연 산화막을 제거하는 단계를 포함하는 제1세정단계;상기 챔버 내부로 공정가스를 분사하여, 상기 기판의 일면 중 성장영역에 박막을 성장시키는 성장단계; 및상기 제1세정단계에서 상기 챔버 내부에 유도결합 플라즈마를 발생시키는 단계;를 포함하고,상기 챔버 내부의 온도는 300℃ 내지 750℃인 것을 포함하는 기판 처리 방법.
- 청구항 1에 있어서,상기 제1세정단계는,상기 챔버 내부로 상기 제1세정가스와 상이한 제2세정가스를 분사하여, 상기 자연 산화막을 제거하는 단계에서 발생하는 부산물을 제거하는 단계를 더 포함하는 기판 처리 방법.
- 청구항 1에 있어서,상기 챔버 내부로 상기 제1세정가스와 상이한 제2세정가스를 분사하여, 상기 기판의 일면에 잔류하는 불순물을 제거하는 제2세정단계를 포함하는 기판 처리 방법.
- 청구항 3에 있어서,상기 제2세정단계는 상기 챔버 내부에 유도결합 플라즈마를 발생시키는 단계를 포함하는 기판 처리 방법.
- 청구항 4에 있어서,상기 챔버 내부로 기판을 반입하기 전 및 상기 챔버 내부의 기판을 외부로 반출한 후 중 적어도 하나에서 실시하는 챔버 세정단계를 포함하고,상기 챔버 세정단계는, 상기 챔버 내부로 상기 제2세정가스를 분사하는 단계를 포함하는 기판 처리 방법.
- 청구항 5에 있어서,상기 챔버 세정단계는 상기 챔버 내부에 유도결합 플라즈마를 발생시키는 단계를 포함하는 기판 처리 방법.
- 청구항 6에 있어서,상기 챔버 세정단계에서 유도결합 플라즈마 발생을 위해 상기 챔버 외부의 플라즈마 발생부로 인가되는 RF 전원의 세기는 상기 제1 및 제2세정단계에서 인가되는 RF 전원의 세기와 상이한 기판 처리 방법.
- 청구항 3에 있어서,상기 성장단계 및 제2세정단계를 교대로 복수 회 실시하는 기판 처리 방법.
- 챔버;기판을 지지할 수 있도록 상기 챔버 내부에 설치된 지지대;상기 챔버 내부에 유도결합 플라즈마를 발생시킬 수 있도록 상기 챔버의 외부에 설치된 플라즈마 발생부; 및상기 기판 상에 박막을 성장시키는 성장공정 전에 상기 챔버로 제1세정가스를 분사하는 제1세정공정에서 상기 챔버 내부에 유도결합 플라즈마가 발생될 수 있도록 상기 플라즈마 발생부의 동작을 제어하는 제어부;를 포함하고,상기 챔버 내부의 온도는 300℃ 내지 750℃인 것을 포함하는 기판 처리 장치.
- 청구항 9에 있어서,상기 제어부는, 상기 성장공정 후에 상기 챔버로 상기 제1세정가스와 상이한 제2세정가스를 분사하는 제2세정공정에서 상기 챔버 내부에 유도결합 플라즈마가 발생될 수 있도록 상기 플라즈마 발생부의 동작을 제어하는 기판 처리 장치.
- 청구항 10에 있어서,상기 제어부는 서로 상이한 세기의 제1RF 전원 및 제2RF 전원 중 어느 하나를 상기 플라즈마 발생부로 인가시키는 기판 처리 장치.
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KR20040007533A (ko) * | 2001-05-04 | 2004-01-24 | 램 리서치 코포레이션 | 챔버 내 잔여물의 2단계 플라즈마 세정 |
KR20040037162A (ko) * | 2002-07-01 | 2004-05-04 | 자이단호우진 치큐칸쿄 산교기쥬츠 켄큐키코 | 불소 가스에 의한 세정 기구를 구비하는 cvd 장치 및cvd 장치의 불소 가스에 의한 세정 방법 |
WO2007100528A2 (en) * | 2006-02-27 | 2007-09-07 | Lam Research Corporation | Integrated capacitive and inductive power sources for a plasma etching chamber |
KR20180011428A (ko) * | 2016-07-22 | 2018-02-01 | 삼성전자주식회사 | 전세정 장치 및 기판 처리 시스템 |
KR102067184B1 (ko) * | 2018-04-05 | 2020-01-16 | 무진전자 주식회사 | 복합 rf 주파수를 사용하는 플라즈마 건식 세정 장치 |
-
2022
- 2022-04-08 JP JP2023561093A patent/JP2024519442A/ja active Pending
- 2022-04-08 WO PCT/KR2022/005103 patent/WO2022216105A1/ko active Application Filing
- 2022-04-08 TW TW111113502A patent/TW202300243A/zh unknown
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KR20040007533A (ko) * | 2001-05-04 | 2004-01-24 | 램 리서치 코포레이션 | 챔버 내 잔여물의 2단계 플라즈마 세정 |
KR20040037162A (ko) * | 2002-07-01 | 2004-05-04 | 자이단호우진 치큐칸쿄 산교기쥬츠 켄큐키코 | 불소 가스에 의한 세정 기구를 구비하는 cvd 장치 및cvd 장치의 불소 가스에 의한 세정 방법 |
WO2007100528A2 (en) * | 2006-02-27 | 2007-09-07 | Lam Research Corporation | Integrated capacitive and inductive power sources for a plasma etching chamber |
KR20180011428A (ko) * | 2016-07-22 | 2018-02-01 | 삼성전자주식회사 | 전세정 장치 및 기판 처리 시스템 |
KR102067184B1 (ko) * | 2018-04-05 | 2020-01-16 | 무진전자 주식회사 | 복합 rf 주파수를 사용하는 플라즈마 건식 세정 장치 |
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