WO2022196077A1 - 基板処理方法、および、基板処理装置 - Google Patents
基板処理方法、および、基板処理装置 Download PDFInfo
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- WO2022196077A1 WO2022196077A1 PCT/JP2022/001503 JP2022001503W WO2022196077A1 WO 2022196077 A1 WO2022196077 A1 WO 2022196077A1 JP 2022001503 W JP2022001503 W JP 2022001503W WO 2022196077 A1 WO2022196077 A1 WO 2022196077A1
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/0223—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate
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Definitions
- the present invention relates to a substrate processing method for processing a substrate and a substrate processing apparatus for processing a substrate.
- Substrates to be processed include, for example, semiconductor wafers, FPD (Flat Panel Display) substrates such as liquid crystal display devices and organic EL (Electroluminescence) display devices, optical disk substrates, magnetic disk substrates, and magneto-optical disk substrates. , photomask substrates, ceramic substrates, solar cell substrates, and the like.
- FPD Full Panel Display
- organic EL Electrode
- Photomask substrates ceramic substrates, solar cell substrates, and the like.
- Patent Document 1 a process of supplying an oxidizing fluid such as a hydrogen peroxide solution (H 2 O 2 water) to a substrate to form a metal oxide layer, and supplying an etchant such as dilute hydrofluoric acid (DHF) to the substrate. and removing the metal oxide layer are repeated to achieve the desired amount of etching.
- an oxidizing fluid such as a hydrogen peroxide solution (H 2 O 2 water)
- a etchant such as dilute hydrofluoric acid (DHF)
- the metal oxide layer is etched by repeating the formation of the metal oxide layer and the removal of the metal oxide layer.
- Patent Literature 1 the formation and removal of the metal oxide layer employ continuous flows of dilute hydrofluoric acid and hydrogen peroxide water, respectively. Therefore, in substrate processing, it is necessary to use a large amount of chemicals such as dilute hydrofluoric acid and hydrogen peroxide solution, which poses a problem of environmental load.
- one object of the present invention is to provide a substrate processing method and a substrate processing apparatus capable of satisfactorily etching a substrate while reducing the environmental load.
- An embodiment of the present invention includes a substrate preparation step of preparing a substrate having a main surface where a first oxide layer is exposed, and forming a first polymer film containing a first acidic polymer on the main surface of the substrate.
- a substrate processing comprising: a first etching step of etching the substrate; and a first rinsing step of supplying the main surface of the substrate with a first rinse liquid for washing the main surface of the substrate after the first etching step. provide a way.
- the substrate processing method since the first polymer film is formed on the main surface of the substrate and the substrate is etched, the first oxide layer is removed from the substrate. After that, the main surface of the substrate is washed with the first rinsing liquid, thereby removing the first polymer film from the main surface of the substrate.
- etching of the substrate can be initiated by formation of the first polymer film, and etching of the substrate can be stopped by removing the first polymer film from the major surface of the substrate. Therefore, since the amount of etching of the substrate can be adjusted by forming and removing the first polymer film, the substrate can be etched satisfactorily.
- the first polymer film used for etching the substrate is semi-solid or solid because it contains the first acidic polymer. Therefore, the first polymer film tends to stay on the main surface of the substrate compared to the liquid. Therefore, it is not necessary to continuously supply the first acidic polymer to the main surface of the substrate during the entire period of etching the substrate. In other words, at least after forming the first polymer film, there is no need to additionally supply the first acidic polymer to the upper surface of the substrate. Therefore, environmental load can be reduced.
- the first polymer film further contains a first alkaline component.
- the first etching step includes etching the substrate by heating the first polymer film after the first polymer film is formed to evaporate the first alkali component from the first polymer film. including a first etch initiation step to initiate.
- the first alkaline component is contained in the first polymer film together with the acidic polymer. Therefore, after the formation of the first polymer film, the acidic polymer is neutralized by the first alkaline component and is almost inactivated until the first polymer film is heated. Therefore, etching of the substrate hardly starts until the first polymer film is heated after the first polymer film is formed.
- the first acidic polymer in the first polymer film is reactivated and etching of the substrate is initiated. Therefore, the substrate can be etched with high accuracy. In particular, it is possible to accurately control the start timing of the etching of the substrate.
- the first polymer film further contains a first conductive polymer. Therefore, the action of the conductive polymer can promote the ionization of the acidic polymer in the polymer film. Therefore, the acidic polymer can effectively act on the oxide layer.
- the first conductive polymer functions as a medium for the first acidic polymer to release protons (hydrogen ions). Therefore, as long as the conductive polymer is contained in the first polymer film, the first acidic polymer can be ionized and ionized even if the liquid component such as the solvent has completely disappeared from the first polymer film.
- the first acidic polymer can act on the oxide layer.
- the first etching step includes a first oxide layer removing step of removing at least a portion of the first oxide layer by the acidic polymer in the first polymer film.
- the first rinsing step includes a first polymer film removing step of removing the first polymer film from the main surface of the substrate with the first rinsing liquid.
- the first oxide layer exposed from the main surface of the substrate is removed by the first acidic polymer contained in the first polymer film.
- the first rinsing liquid can then remove the first polymer film from the main surface of the substrate. Therefore, the formation and removal of the first polymer film allows for better etching of the substrate.
- the first etching step and the first rinsing step are further performed at least once in this order.
- the first etching process and the first rinsing process are further performed at least once in this order. That is, the formation and removal of the first polymer film are performed multiple times. Even if the substrate is not sufficiently etched by forming and removing the first polymer film once, the substrate can be sufficiently etched by forming and removing the first polymer film a plurality of times. In particular, even if the formation and removal of the first polymer film once does not etch the first oxide layer by a desired amount, the formation and removal of the first polymer film is performed multiple times to remove the first oxide layer. Sufficient etching is possible. For example, the formation and removal of the first polymer film multiple times may exhaust the first oxide layer from the substrate.
- the first etching step is performed again after the first rinsing step. Therefore, after the first polymer film formed on the main surface of the substrate is once removed, the first polymer film is formed again on the main surface of the substrate. Therefore, the first polymer film in which the first acidic polymer has been consumed by the etching of the substrate can be removed from the main surface of the substrate, and the substrate can be etched with a new first polymer film. Therefore, compared to a configuration in which the substrate is etched by repeatedly supplying a liquid oxidizing agent such as dilute hydrofluoric acid and an etchant such as hydrogen peroxide, the amount of substances required for etching the substrate can be reduced.
- a liquid oxidizing agent such as dilute hydrofluoric acid
- an etchant such as hydrogen peroxide
- the substrate processing method removes the first rinse solution from the main surface of the substrate after the first rinsing step and before the next first etching step is started. It further includes a first liquid removing step.
- the first rinse is removed from the main surface of the substrate after the first polymer film is removed by the first rinse and before the first polymer film is newly formed. be done. Therefore, it is possible to prevent the first polymer film being formed from being removed by the first rinse remaining on the main surface of the substrate.
- the first polymer film can sufficiently exhibit the etching action of the substrate, it is possible to increase the etching amount of the substrate by forming the first polymer film once. As a result, the amount of substances required for etching the substrate can be further reduced, thereby reducing the environmental load.
- the structure is such that the first rinse liquid is removed from the main surface of the substrate to dry the main surface of the substrate, the first rinse liquid remaining on the main surface of the substrate at the start of the first etching step is further prevented. can be suppressed.
- the substrate processing method includes, before the first etching step, a polymer-containing liquid supply step of supplying a polymer-containing liquid containing a solvent and a first acidic polymer to the main surface of the substrate. Including further.
- the first etching step includes forming the first polymer film by evaporating at least part of the solvent in the polymer-containing liquid on the major surface of the substrate.
- the first polymer film can be formed by evaporating the solvent from the polymer-containing liquid supplied to the surface of the substrate. Therefore, evaporation of the solvent can increase the concentration of the acidic polymer in the first polymer film. Therefore, a high concentration of acidic polymer can act on the substrate. Therefore, the substrate can be rapidly etched. In particular, the first oxide layer can be etched quickly.
- the substrate processing method comprises an oxidation step of performing oxidation treatment on the main surface of the substrate after the final first rinse step, and a second acidification step after the oxidation step. a second etching step of forming a semi-solid or solid second polymer film containing a polymer on the main surface of the substrate and etching the substrate; and a second rinsing step of supplying the main surface of the substrate.
- the substrate processing method after the final first rinse step, the main surface of the substrate is oxidized, and then the substrate is etched. Therefore, the substrate can be additionally etched to ensure a sufficient etching amount. Therefore, the substrate can be etched better.
- the second polymer film further contains a second alkaline component.
- the second etching step includes heating the second polymer film after the second polymer film is formed to evaporate the second alkali component from the second polymer film, thereby etching the substrate. and a second etch initiation step to initiate.
- the second alkaline component is contained in the second polymer film together with the second acidic polymer. Therefore, after the formation of the second polymer film, the second acidic polymer is neutralized by the second alkaline component and is almost inactivated until the second polymer film is heated. Therefore, after the second polymer film is formed, etching of the substrate hardly starts until the second polymer film is heated. By heating the second polymer film to evaporate the alkali component, the second acidic polymer in the second polymer film regains its activity and the etching of the substrate is started. Therefore, the substrate can be etched with high precision. In particular, it is possible to accurately control the start timing of the etching of the substrate.
- the second polymer film further contains a second conductive polymer. Therefore, the action of the second conductive polymer can promote ionization of the acidic polymer in the second polymer film. Therefore, the second acidic polymer can effectively act on the oxide layer.
- the second conductive polymer functions as a medium for the second acidic polymer to release protons (hydrogen ions). Therefore, as long as the second conductive polymer is contained in the second polymer film, even if the liquid component such as the solvent has completely disappeared from the second polymer film, the second acidic polymer is ionized, The ionized second acidic polymer can act on the oxide layer.
- the oxidation step includes a second oxide layer forming step of forming a second oxide layer on the surface layer portion of the main surface of the substrate.
- the second etching step includes a second oxide layer removing step of removing at least a portion of the second oxide layer by the second acidic polymer in the second polymer film.
- the second rinsing step includes a second polymer film removing step of removing the second polymer film from the main surface of the substrate with the second rinsing liquid after the second etching step.
- the surface layer portion of the main surface of the substrate is subjected to the second oxidation process by the oxidation treatment.
- a layer is formed.
- the substrate is then further etched by performing the formation and removal of the second polymer film after the oxidation process. Therefore, when the etching amount of the substrate is insufficient only by removing the first oxide layer, the etching amount can be sufficiently increased by additionally forming the second oxide layer and then removing the second oxide layer. can be secured.
- a film containing the second acidic polymer (second polymer film) is used in the same manner as when removing the first oxide layer. Therefore, the amount of substances used for etching the substrate can be reduced, so that the environmental load can be reduced.
- the oxidation step, the second etching step and the second rinsing step are further performed at least once in this order.
- the oxidation process, the second etching process and the second rinsing process are repeated. That is, oxidation and etching of the substrate are performed multiple times. Therefore, the substrate can be additionally etched a plurality of times to ensure a sufficient etching amount.
- the formation and removal of the second oxide layer are alternately performed multiple times. Therefore, formation and removal of a small amount of the second oxide layer (for example, 1 nm or more and 10 nm or less) can be repeated. Therefore, compared with the case of forming and removing a large amount of the second oxide layer at once, it is easier to adjust the etching amount of the substrate. As a result, the substrate can be etched with high accuracy.
- the first acidic polymer is a carboxy group-containing polymer, a sulfo group-containing polymer, or a mixture thereof. If the first acidic polymer is one of these polymers, water such as DIW (deionized water) can be used as the liquid for dissolving the first acidic polymer. Therefore, it is not necessary to use an organic solvent as a solvent for dissolving the first acidic polymer. Furthermore, it is not necessary to use an organic solvent as the first rinsing liquid for removing each of the first polymer films. Therefore, the environmental load can be further reduced.
- DIW deionized water
- the substrate processing apparatus includes a polymer film forming unit that forms a semi-solid or solid polymer film containing an acidic polymer on the main surface of the substrate, and a rinse liquid that cleans the main surface of the substrate. a rinse liquid supply unit for supplying the main surface.
- FIG. 1 is a schematic cross-sectional view for explaining the structure of the surface layer of a substrate to be processed.
- FIG. 2A is a plan view for explaining the configuration of the substrate processing apparatus according to the first embodiment of the invention.
- FIG. 2B is an elevation view for explaining the configuration of the substrate processing apparatus.
- FIG. 3 is a schematic cross-sectional view for explaining a configuration example of a wet processing unit provided in the substrate processing apparatus.
- FIG. 4 is a block diagram for explaining a configuration example related to control of the substrate processing apparatus.
- FIG. 5 is a flowchart for explaining an example of substrate processing performed by the substrate processing apparatus.
- FIG. 6A is a schematic diagram for explaining the state of the substrate during the substrate processing.
- FIG. 6A is a schematic diagram for explaining the state of the substrate during the substrate processing.
- FIG. 6B is a schematic diagram for explaining the state of the substrate during the substrate processing.
- FIG. 6C is a schematic diagram for explaining the state of the substrate during the substrate processing.
- FIG. 6D is a schematic diagram for explaining the state of the substrate during the substrate processing.
- FIG. 6E is a schematic diagram for explaining the state of the substrate during the substrate processing.
- FIG. 6F is a schematic diagram for explaining the state of the substrate during the substrate processing.
- FIG. 7 is a schematic diagram for explaining the structure of the surface layer portion of the substrate when the polymer film is formed.
- FIG. 8A is a schematic diagram for explaining how an etchant composed of a low-molecular-weight etching component removes an oxide layer at a grain boundary.
- FIG. 8A is a schematic diagram for explaining how an etchant composed of a low-molecular-weight etching component removes an oxide layer at a grain boundary.
- FIG. 8B is a schematic diagram for explaining how the polymer film removes the oxide layer at the grain boundary.
- FIG. 9 is a schematic cross-sectional view for explaining a configuration example of a wet processing unit provided in the substrate processing apparatus according to the second embodiment of the invention.
- FIG. 10 is a flowchart for explaining an example of substrate processing performed by the substrate processing apparatus according to the second embodiment.
- FIG. 11A is a schematic diagram for explaining a state of a substrate during substrate processing according to the second embodiment.
- FIG. 11B is a schematic diagram for explaining the state of the substrate when substrate processing according to the second embodiment is being performed.
- FIG. 12 is a schematic diagram for explaining changes in the surface layer of the upper surface of the substrate due to alternate repetition of the oxidation process and the second etching process in the substrate processing according to the second embodiment.
- FIG. 13 is a schematic cross-sectional view for explaining a modification of the wet processing unit provided in the substrate processing apparatus.
- FIG. 1 is a schematic cross-sectional view for explaining the structure of the surface layer of the substrate W to be processed.
- the substrate W is a substrate such as a silicon wafer and has a pair of main surfaces. At least one of the pair of main surfaces is the device surface on which the uneven pattern 120 is formed. One of the pair of main surfaces may be a non-device surface on which the uneven pattern 120 is not formed.
- the surface layer of the device surface includes, for example, an insulating layer 105 in which a plurality of trenches 122 are formed, a layer 102 to be processed formed in each trench 122 so that the surface is exposed, and a layer laminated on the layer 102 to be processed. and a first oxide layer 103 are formed.
- the insulating layer 105 has fine convex structures 121 positioned between adjacent trenches 122 and bottom partitions 123 partitioning the bottoms of the trenches 122 .
- a plurality of structures 121 and a plurality of trenches 122 form an uneven pattern 120 .
- the surface of the layer to be processed 102 and the surface of the insulating layer 105 (the structure 121) constitute at least part of the main surface of the substrate W. As shown in FIG.
- Insulating layer 105 is, for example, a silicon oxide (SiO 2 ) layer or a low dielectric constant layer.
- the low dielectric constant layer is made of a low dielectric constant (Low-k) material that has a lower dielectric constant than silicon oxide.
- the low dielectric constant layer is made of an insulating material (SiOC) in which carbon is added to silicon oxide.
- the processing target layer 102 is, for example, a metal layer, a silicon layer, or the like.
- a typical metal layer is copper wiring.
- the metal layer is formed, for example, by growing a crystal using an electroplating technique or the like, using a seed layer (not shown) formed in the trench 122 by a method such as sputtering as a nucleus.
- the method of forming the metal layer is not limited to this method.
- the metal layer may be formed only by sputtering, or may be formed by other techniques.
- the first oxide layer 103 is, for example, a metal oxide layer, a silicon oxide layer, or the like.
- a typical metal oxide layer is a copper oxide layer.
- the first oxide layer 103 may be formed by oxidizing the surface layer portion of the layer 102 to be processed by, for example, anodization, thermal oxidation, ashing, or the like, or may be formed by chemical vapor deposition (CVD) or the like. It may be formed on the surface of the processing target layer 102 by a method. Also, the first oxide layer 103 may be a natural oxide film.
- a barrier layer and a liner layer may be provided between the layer to be processed 102 and the insulating layer 105 in the trench 122 .
- the barrier layer is, for example, tantalum nitride (TaN), and the liner layer is, for example, ruthenium (Ru) or cobalt (Co).
- the trench 122 is line-shaped, for example.
- the width L of the line-shaped trench 122 is the size of the trench 122 in the direction orthogonal to the direction in which the trench 122 extends and the thickness direction T of the substrate W. As shown in FIG.
- the widths L of the plurality of trenches 122 are not all the same, and trenches 122 having at least two types of widths L are formed in the surface layer portion of the device surface of the substrate W.
- the width L is also the width of the layer to be processed 102 and the first oxide layer 103 .
- the width L of the trench 122 is, for example, 20 nm or more and 500 nm or less.
- a depth D of the trench 122 is the size of the trench 122 in the thickness direction T, and is, for example, 200 nm or less.
- a plurality of trenches 122 may be connected to each other. Also, the trenches 122 do not necessarily have to be linear, and may be fine holes (voids or pores). If the trench 122 is a pore, the width L of the trench 122 is the diameter of the pore.
- the layer 102 to be processed is a metal layer composed of a plurality of crystal grains 110 and the first oxide layer 103 is a metal oxide layer formed by oxidizing the layer 102 to be processed.
- the first oxide layer 103 is also composed of a plurality of crystal grains 110 like the layer 102 to be processed.
- An interface between crystal grains 110 is called a crystal grain boundary 111 .
- the crystal grain boundary 111 is a kind of lattice defect and is formed by disorder of atomic arrangement.
- the crystal grains 110 are less likely to grow as the width L of the trench 122 is narrower, and are more likely to grow as the width L of the trench 122 is wider. Therefore, the narrower the width L of the trench 122, the smaller the crystal grains 110 are likely to be formed, and the wider the width L of the trench 122, the larger the crystal grains 110 are likely to be formed. That is, the narrower the width L of the trench 122, the higher the grain boundary density, and the wider the width L of the trench 122, the lower the grain boundary density.
- FIG. 2A is a plan view for explaining the configuration of the substrate processing apparatus 1 according to the first embodiment of the invention.
- FIG. 2B is an elevation view for explaining the configuration of the substrate processing apparatus 1.
- the substrate processing apparatus 1 is a single-wafer type apparatus that processes substrates W one by one.
- the substrate W has a disk shape.
- the substrate W is processed in a device-side-up orientation.
- the substrate processing apparatus 1 includes a plurality of processing units 2 for processing substrates W, a load port LP on which a carrier C containing a plurality of substrates W to be processed by the processing units 2 is mounted, the load port LP and processing. It includes transport robots IR and CR that transport substrates W between units 2 and controller 3 that controls substrate processing apparatus 1 .
- the transport robot IR transports the substrate W between the carrier C and the transport robot CR.
- the transport robot CR transports the substrate W between the transport robot IR and the processing unit 2 .
- Each of the transport robots IR and CR is articulated including a pair of multi-joint arms AR and a pair of hands H provided at the tips of the pair of multi-joint arms AR so as to be spaced apart from each other in the vertical direction. Arm robot.
- the plurality of processing units 2 form four processing towers that are respectively arranged at four horizontally separated positions.
- Each processing tower includes a plurality (three in this embodiment) of processing units 2 stacked vertically (see FIG. 2B).
- the four processing towers are arranged two by two on each side of the transport path TR extending from the load port LP toward the transport robots IR and CR (see FIG. 2A).
- the processing unit 2 is a wet processing unit 2W that processes the substrate W with liquid.
- Each wet processing unit 2W includes a chamber 4 and a processing cup 7 disposed within the chamber 4, and processes the substrate W within the processing cup 7. As shown in FIG.
- the chamber 4 is formed with an entrance (not shown) for loading and unloading the substrate W by the transport robot CR.
- the chamber 4 is provided with a shutter unit (not shown) that opens and closes this entrance.
- FIG. 3 is a schematic cross-sectional view for explaining a configuration example of the wet processing unit 2W.
- the wet processing unit 2W heats the spin chuck 5 that rotates the substrate W around the rotation axis A1 (vertical axis) while holding the substrate W at a predetermined holding position, and the substrate W held by the spin chuck 5.
- a heater unit 6 is further provided.
- the rotation axis A1 is a vertical straight line passing through the central portion of the substrate W. As shown in FIG.
- the holding position is the position of the substrate W shown in FIG. 3, and is the position where the substrate W is held in a horizontal posture.
- the spin chuck 5 includes a spin base 21 having a disk shape along the horizontal direction, a plurality of chuck pins 20 for gripping the substrate W above the spin base 21 and holding the substrate W at a holding position, and an upper end portion of the spin base 21 . are coupled to extend in the vertical direction, and a spin motor 23 rotates the rotary shaft 22 around its central axis (rotational axis A1).
- a plurality of chuck pins 20 are arranged on the upper surface of the spin base 21 at intervals in the circumferential direction of the spin base 21 .
- the spin motor 23 is an electric motor. The spin motor 23 rotates the rotation shaft 22 to rotate the spin base 21 and the plurality of chuck pins 20 around the rotation axis A1. Thereby, the substrate W is rotated around the rotation axis A1 together with the spin base 21 and the plurality of chuck pins 20 .
- the plurality of chuck pins 20 are movable between a closed position in which they are in contact with the peripheral edge of the substrate W to grip the substrate W and an open position in which they are retracted from the peripheral edge of the substrate W.
- a plurality of chuck pins 20 are moved by an opening/closing unit 25 .
- the plurality of chuck pins 20 horizontally hold (hold) the substrate W when positioned at the closed position.
- the plurality of chuck pins 20 release the grip of the peripheral edge of the substrate W, while contacting the peripheral edge of the lower surface (lower main surface) of the substrate W to lift the substrate W from below. To support.
- the opening/closing unit 25 includes, for example, a link mechanism that moves the plurality of chuck pins 20 and a drive source that applies driving force to the link mechanism.
- the drive source includes, for example, an electric motor.
- the heater unit 6 is an example of a substrate heating unit that heats the entire substrate W.
- the heater unit 6 has the shape of a disk-shaped hot plate.
- the heater unit 6 is arranged between the upper surface of the spin base 21 and the lower surface of the substrate W. As shown in FIG.
- the heater unit 6 has a heating surface 6a facing the lower surface of the substrate W from below.
- the heater unit 6 includes a plate body 61 and a heater 62.
- the plate body 61 is slightly smaller than the substrate W in plan view.
- the upper surface of the plate body 61 constitutes the heating surface 6a.
- the heater 62 may be a resistor built in the plate body 61 . By energizing the heater 62, the heating surface 6a is heated.
- the heater 62 can heat the substrate W to a temperature approximately equal to the temperature of the heater 62 .
- the heater 62 is configured to heat the substrate W within a temperature range of room temperature (for example, a temperature of 5° C. or higher and 25° C. or lower) to 400° C. or lower.
- An energizing unit 64 such as a power supply is connected to the heater 62 via a power supply line 63. By adjusting the current supplied from the energizing unit 64, the temperature of the heater 62 falls within the temperature range described above. change to
- the heater unit 6 is raised and lowered by a heater elevation drive mechanism 65 .
- the heater elevating drive mechanism 65 includes, for example, an actuator (not shown) such as an electric motor or an air cylinder that drives the elevating shaft 66 to elevate.
- the heater elevating drive mechanism 65 elevates the heater unit 6 via an elevating shaft 66 .
- the heater unit 6 can move up and down between the lower surface of the substrate W and the upper surface of the spin base 21 .
- the heater unit 6 can receive the substrate W from the plurality of chuck pins 20 positioned at the open position when ascending.
- the heater unit 6 can heat the substrate W by arranging the heating surface 6a at a contact position where the heating surface 6a is in contact with the lower surface of the substrate W, or at a close position where the heating surface 6a is close to the lower surface of the substrate W without contact.
- a position at which the substrate W is sufficiently retracted from the lower surface of the substrate W to such an extent that heating of the substrate W by the heater unit 6 is stopped is called a retraction position.
- a shielding plate 35 is provided for shielding the atmosphere in the space between the upper surface (upper main surface) of the substrate W held by the spin chuck 5 from the atmosphere outside the space. It is
- the blocking plate 35 has a facing surface 35a that faces the upper surface of the substrate W held by the spin chuck 5 from above.
- the blocking plate 35 is formed in a disc shape having a diameter substantially equal to or larger than that of the substrate W.
- a support shaft 36 is fixed to the blocking plate 35 on the side opposite to the facing surface 35a.
- the blocking plate 35 is connected to a blocking plate elevating mechanism 37 that raises and lowers the blocking plate 35 .
- the blocking plate elevating mechanism 37 includes, for example, an actuator (not shown) such as an electric motor or an air cylinder that drives the support shaft 36 up and down.
- the blocking plate 35 may be rotatable around the rotation axis A1.
- a gas discharge port 38 for discharging a gas such as nitrogen gas is provided on the facing surface 35a.
- the gas discharged from the gas discharge port 38 is not limited to nitrogen gas.
- the gas discharged from the gas discharge port 38 may be air.
- the gas discharged from the gas discharge port 38 may be an inert gas other than nitrogen gas.
- the inert gas is not limited to nitrogen gas, and is a gas that is inert to the upper surface of the substrate W. As shown in FIG. Examples of inert gases include nitrogen gas and rare gases such as argon.
- the gas outlet 38 is connected to a gas pipe 43 that guides the gas to the gas outlet 38 .
- the gas pipe 43 is provided with a gas valve 53A that opens and closes the flow path in the gas pipe 43, and a gas flow control valve 53B that adjusts the flow rate of the gas in the flow path.
- gas valve 53A When the gas valve 53A is opened, gas is discharged from the gas discharge port 38 toward the upper surface of the substrate W at a flow rate corresponding to the degree of opening of the gas flow control valve 53B.
- the processing cup 7 receives liquid splashed from the substrate W held by the spin chuck 5 .
- the processing cup 7 has a plurality of guards 30 (two in the example of FIG. 3) for receiving the liquid splashing outward from the substrate W held by the spin chuck 5, and the liquid guided downward by the plurality of guards 30. It includes a plurality (two in the example of FIG. 3) of cups 31 for receiving and a cylindrical outer wall member 32 surrounding the plurality of guards 30 and the plurality of cups 31 .
- the plurality of guards 30 are individually raised and lowered by a guard elevation drive mechanism (not shown). The guard lifting drive mechanism positions the guard 30 at any position from the upper position to the lower position.
- the wet processing unit 2W includes a polymer-containing liquid nozzle 10 for supplying a polymer-containing liquid containing an acidic polymer to the upper surface of the substrate W held by the spin chuck 5, and a DIW nozzle 10 for supplying a polymer-containing liquid to the upper surface of the substrate W held by the spin chuck 5.
- a rinse liquid nozzle 11 for supplying a rinse liquid such as (deionized water) is further provided.
- the polymer-containing liquid contains a solute and a solvent that dissolves the solute.
- the solute of the polymer-containing liquid contains an acidic polymer, an alkaline component, and a conductive polymer.
- the acidic polymer is an acidic polymer that dissolves the oxidized layer without oxidizing the layer to be treated. Acidic polymers are solid at room temperature and exhibit acidity by releasing protons in a solvent.
- the molecular weight of the acidic polymer is, for example, 1000 or more and 100000 or less.
- Acidic polymers are not limited to polyacrylic acid.
- Acidic polymers are, for example, carboxy group-containing polymers, sulfo group-containing polymers, or mixtures thereof.
- Carboxylic acid polymers are, for example, polyacrylic acid, carboxyvinyl polymers (carbomers), carboxymethylcellulose, or mixtures thereof.
- Sulfo-group-containing polymers are, for example, polystyrenesulfonic acid, polyvinylsulfonic acid, or mixtures thereof.
- the solvent contained in the polymer-containing liquid may be any substance as long as it is liquid at room temperature, can dissolve or swell the acidic polymer, and evaporates when the substrate W is rotated or heated.
- the solvent contained in the polymer-containing liquid is not limited to DIW, but is preferably an aqueous solvent.
- Solvents include DIW, carbonated water, electrolyzed ion water, hydrochloric acid water with a dilution concentration (e.g., 1 ppm or more and 100 ppm or less), ammonia water with a dilution concentration (e.g., 1 ppm or more and 100 ppm or less), reduced water. It contains at least one of (hydrogen water).
- the alkaline component is, for example, ammonia.
- the alkaline component is not limited to ammonia.
- alkaline components include, for example, ammonia, tetramethylammonium hydroxide (TMAH), dimethylamine, or mixtures thereof.
- TMAH tetramethylammonium hydroxide
- the alkali component is preferably a component that evaporates when heated to a temperature below the boiling point of the solvent and exhibits alkalinity in the solvent. It is particularly preferred that the alkaline component is ammonia or dimethylamine, which are gases at room temperature, and mixtures thereof.
- the conductive polymer is not limited to polyacetylene.
- a conductive polymer is a conjugated polymer having conjugated double bonds.
- Conjugated polymers include, for example, aliphatic conjugated polymers such as polyacetylene, aromatic conjugated polymers such as poly(p-phenylene), mixed conjugated polymers such as poly(p-phenylene vinylene), polypyrrole, polythiophene, poly Heterocyclic conjugated polymers such as (3,4-ethylenedioxythiophene) (PEDOT), heteroatom-containing conjugated polymers such as polyaniline, double-chain conjugated polymers such as polyacene, two-dimensional conjugated polymers such as graphene, Or a mixture of these.
- the polymer-containing liquid nozzle 10 is a mobile nozzle that can move at least horizontally.
- the polymer-containing liquid nozzle 10 is horizontally moved by the first nozzle moving unit 33 .
- the first nozzle moving unit 33 includes an arm (not shown) coupled to the polymer-containing liquid nozzle 10 and extending horizontally, and an arm moving unit for horizontally moving the arm.
- the arm movement unit may be an electric motor, an air cylinder, or an actuator other than these.
- the polymer-containing liquid nozzle 10 may be vertically movable.
- the polymer-containing liquid nozzle 10 can approach the upper surface of the substrate W or retreat upward from the upper surface of the substrate W by moving in the vertical direction.
- the polymer-containing liquid nozzle 10 may be a fixed nozzle with fixed horizontal and vertical positions.
- the polymer-containing liquid nozzle 10 is connected to one end of a polymer-containing liquid pipe 41 that guides the polymer-containing liquid to the polymer-containing liquid nozzle 10 .
- the other end of the polymer-containing liquid pipe 41 is connected to a polymer-containing liquid tank (not shown).
- the polymer-containing liquid pipe 41 is provided with a polymer-containing liquid valve 51A for opening and closing a channel in the polymer-containing liquid pipe 41, and a polymer-containing liquid flow control valve 51B for adjusting the flow rate of the polymer-containing liquid in the channel. is dressed.
- the polymer-containing liquid valve 51A When the polymer-containing liquid valve 51A is opened, the polymer-containing liquid is continuously discharged downward from the discharge port of the polymer-containing liquid nozzle 10 at a flow rate corresponding to the degree of opening of the polymer-containing liquid flow control valve 51B.
- the semi-solid state is a state in which a solid component and a liquid component are mixed, or a state in which the substrate W has such a viscosity that a fixed shape can be maintained.
- the term "solid state” means a state in which liquid components are not contained and only solid components are used. A polymer film in which the solvent remains is semi-solid, and a polymer film in which the solvent has completely disappeared is solid.
- the polymer-containing liquid contains an alkaline component and a conductive polymer as a solute in addition to the acidic polymer. Therefore, the polymer film contains an acidic polymer, an alkaline component and a conductive polymer.
- the polymer film contains an alkaline component and an acidic polymer
- the polymer film is neutral. That is, the acidic polymer is neutralized by the alkaline component and is almost deactivated. Therefore, the oxidized layer of the substrate W is hardly dissolved by the action of the acidic polymer.
- the acidic polymer regains activity when the polymer film is heated to evaporate the alkaline component from the polymer film. That is, the oxide layer of the substrate W is dissolved by the action of the acidic polymer.
- the solvent remains in the polymer film without being completely evaporated. If so, the acidic polymer in the polymer film can sufficiently exhibit its function as an acid, so that the oxidized layer can be removed efficiently. If the solvent remains, the polymer film exhibits neutrality when the alkali component is present in the polymer film, and the polymer film exhibits acidity after the alkali component evaporates.
- the conductive polymer like the solvent, functions as a medium for the acidic polymer to release protons (hydrogen ions). Therefore, even when the solvent has completely disappeared from the polymer film, the acidic polymer can be ionized and act on the oxidized layer.
- the concentration of the acidic polymer component dissolved in the solvent in the polymer film can be increased.
- the first oxide layer can be removed efficiently.
- the higher the temperature of the polymer film the more the acidic polymer accelerates the chemical reaction that removes (dissolves) the oxide layer. That is, acidic polymers have the property that the higher the temperature, the higher the removal rate of the oxide layer. Therefore, by heating the polymer film formed on the upper surface of the substrate W, the first oxide layer can be efficiently removed.
- the rinse liquid nozzle 11 is an example of a rinse liquid supply unit that supplies the rinse liquid to the main surface of the substrate W.
- the rinsing liquid functions as a polymer removing liquid (first polymer removing liquid) that dissolves the polymer film formed on the upper surface of the substrate W and removes it from the main surface of the substrate W.
- the rinsing liquid nozzle 11 serves as a removing liquid supply unit. function as
- the rinse liquid is not limited to DIW.
- the rinsing liquid includes DIW, carbonated water, electrolytic ion water, hydrochloric acid water with a dilution concentration (for example, 1 ppm or more and 100 ppm or less), ammonia water with a dilution concentration (for example, 1 ppm or more and 100 ppm or less), reduction It contains at least one of water (hydrogen water). That is, the same liquid as the solvent for the polymer-containing liquid can be used as the rinse liquid, and if DIW is used as both the rinse liquid and the solvent for the polymer-containing liquid, the types of liquids (substances) to be used can be reduced. can do.
- the rinse liquid nozzle 11 is a fixed nozzle whose horizontal and vertical positions are fixed. Unlike this embodiment, the rinse liquid nozzle 11 may be a movable nozzle that is movable at least in the horizontal direction.
- the rinse liquid nozzle 11 is connected to one end of a rinse liquid pipe 42 that guides the rinse liquid to the rinse liquid nozzle 11 .
- the other end of the rinse liquid pipe 42 is connected to a rinse liquid tank (not shown).
- the rinse liquid pipe 42 is provided with a rinse liquid valve 52A that opens and closes the flow path in the rinse liquid pipe 42, and a rinse liquid flow rate adjustment valve 52B that adjusts the flow rate of the rinse liquid in the flow path.
- the rinse liquid valve 52A When the rinse liquid valve 52A is opened, the rinse liquid discharged in a continuous flow from the discharge port of the rinse liquid nozzle 11 lands on the upper surface of the substrate W. As shown in FIG.
- FIG. 4 is a block diagram for explaining a configuration example related to control of the substrate processing apparatus 1.
- the controller 3 has a microcomputer, and controls objects provided in the substrate processing apparatus 1 according to a predetermined control program.
- the controller 3 includes a processor (CPU) 3A and a memory 3B storing control programs.
- the controller 3 is configured to perform various controls for substrate processing by the processor 3A executing a control program.
- the controller 3 is programmed to control the members (valves, motors, power supplies, etc.) that make up the processing unit 2, the transfer robots IR, CR, and the like. By controlling the valves by the controller 3, the presence or absence of ejection of fluid from the corresponding nozzles and the ejection flow rate of the fluid from the corresponding nozzles are controlled. Each of the following steps is executed by the controller 3 controlling these configurations. In other words, controller 3 is programmed to perform the following steps.
- FIG. 5 is a flowchart for explaining an example of substrate processing performed by the substrate processing apparatus 1. As shown in FIG. 6A to 6F are schematic diagrams for explaining each step of substrate processing performed by the substrate processing apparatus 1. FIG. 6A to 6F are schematic diagrams for explaining each step of substrate processing performed by the substrate processing apparatus 1.
- FIG. 6A to 6F The substrate processing performed by the substrate processing apparatus 1 will be described below mainly with reference to FIGS. 3 and 5.
- a substrate W having a main surface where the first oxide layer is exposed is prepared (substrate preparation step). Specifically, a carrier C accommodating a substrate W having a main surface where the first oxide layer is exposed is placed on the load port LP.
- the substrate W is loaded from the carrier C into the wet processing unit 2W by the transport robots IR and CR (see FIG. 2A) and passed to the plurality of chuck pins 20 of the spin chuck 5 (substrate loading step: step S1).
- the substrate W is gripped by the plurality of chuck pins 20 by the opening/closing unit 25 moving the plurality of chuck pins 20 to the closed position. Thereby, the substrate W is horizontally held by the spin chuck 5 (substrate holding step). While the substrate W is held by the spin chuck 5, the spin motor 23 starts rotating the substrate W (substrate rotation step).
- step S2 the first polymer-containing liquid supply step of supplying the polymer-containing liquid onto the upper surface of the substrate W is performed.
- the first nozzle moving unit 33 moves the polymer-containing liquid nozzle 10 to the processing position.
- the processing position of the polymer-containing liquid nozzle 10 is, for example, the central position where the polymer-containing liquid nozzle 10 faces the central region of the upper surface of the substrate W.
- the central region of the top surface of the substrate W is a region including the center position of the top surface of the substrate W and the periphery of the center position.
- the polymer-containing liquid valve 51A By opening the polymer-containing liquid valve 51A, the polymer-containing liquid is discharged from the polymer-containing liquid nozzle 10 toward the central region of the upper surface of the substrate W (polymer-containing liquid discharge step), as shown in FIG. 6A.
- the polymer-containing liquid discharged from the polymer-containing liquid nozzle 10 lands on the central region of the upper surface of the substrate W. As shown in FIG.
- the substrate W may be rotated at a low speed (for example, 10 rpm) while the polymer-containing liquid is being supplied to the upper surface of the substrate W (low speed rotation step). Alternatively, the rotation of the substrate W may be stopped while the polymer-containing liquid is being supplied to the upper surface of the substrate W.
- the polymer-containing liquid supplied to the substrate W stays in the central region of the upper surface of the substrate W by reducing the rotation speed of the substrate W or stopping the rotation of the substrate W. FIG. Thereby, the usage amount of the polymer-containing liquid can be reduced.
- a solid or semi-solid polymer film 101 is formed on the upper surface of the substrate W by evaporating at least a portion of the solvent in the polymer-containing liquid on the upper surface of the substrate W.
- a first polymer film forming step (step S3) of forming a (first polymer film) is performed.
- the acidic polymer, alkaline component, and conductive polymer contained in the first polymer film are examples of the first acidic polymer, first alkaline component, and first conductive polymer, respectively.
- the polymer-containing liquid valve 51A is closed to stop the ejection of the polymer-containing liquid from the polymer-containing liquid nozzle 10 .
- the first nozzle moving unit 33 moves the polymer-containing liquid nozzle 10 to the retracted position.
- the polymer-containing liquid nozzle 10 When positioned at the retracted position, the polymer-containing liquid nozzle 10 does not face the upper surface of the substrate W, and is positioned outside the processing cup 7 in plan view.
- a spin-off speed is, for example, 1500 rpm. Rotation of the substrate W at the spin-off speed is continued, for example, for 30 seconds.
- the polymer-containing liquid remaining in the central region of the upper surface of the substrate W spreads toward the periphery of the upper surface of the substrate W due to the centrifugal force caused by the rotation of the substrate W. Thereby, the polymer-containing liquid is spread over the entire upper surface of the substrate W. As shown in FIG. As shown in FIG. 6B, part of the polymer-containing liquid on the substrate W scatters outside the substrate W from the peripheral portion of the substrate W, and the liquid film of the polymer-containing liquid on the substrate W is thinned (spin-off process). ).
- the polymer-containing liquid on the upper surface of the substrate W does not need to be scattered outside the substrate W, and should be spread over the entire upper surface of the substrate W by the centrifugal force of the rotation of the substrate W.
- the centrifugal force caused by the rotation of the substrate W acts not only on the polymer-containing liquid on the substrate W, but also on the gas in contact with the polymer-containing liquid on the substrate W. Therefore, due to the action of the centrifugal force, an airflow is formed in which the gas moves from the center side of the upper surface of the substrate W to the peripheral side thereof. This gas flow removes the gaseous solvent in contact with the polymer-containing liquid on the substrate W from the atmosphere in contact with the substrate W.
- FIG. 6C evaporation (volatilization) of the solvent from the polymer-containing liquid on the substrate W is promoted, and a solid or semi-solid polymer film 101 is formed (first polymer film forming step). .
- the polymer-containing liquid nozzle 10 and the spin motor 23 function as a polymer film forming unit.
- the polymer film 101 Since the polymer film 101 has a higher viscosity than the polymer-containing liquid, it remains on the substrate W without being completely removed from the substrate W even though the substrate W is rotating. Immediately after the polymer film 101 is formed, the polymer film 101 contains an alkaline component. Therefore, since the acidic polymer in the polymer film 101 is deactivated, the oxide layer is not removed.
- the first polymer film heating step (step S4) for heating the polymer film 101 on the substrate W is performed. Specifically, as shown in FIG. 6D, the heater unit 6 is arranged at a close position to heat the substrate W (substrate heating process, heater heating process).
- the polymer film 101 formed on the substrate W is heated via the substrate W.
- the alkali component evaporates and the acidic polymer recovers its activity (alkali component evaporation process, alkali component removal process). Therefore, etching of the substrate W is started by the action of the acidic polymer in the polymer film 101 (first etching start step, etching step).
- oxide layer removal start step the removal of the oxide layer formed on the surface layer of the upper surface of the substrate W is started.
- the acidic polymer is neutralized by the alkali component and is almost inactivated until the polymer film 101 is heated. Therefore, etching of the substrate W hardly starts until the polymer film 101 is heated after the polymer film 101 is formed.
- the acidic polymer has the property that the higher the temperature, the higher the removal rate of the first oxide layer. Therefore, by continuing to heat the polymer film 101 even after the alkali component is removed from the polymer film 101, removal of the first oxide layer by the acidic polymer is promoted (first removal promotion step). By promoting the removal of the first oxide layer, the time required for substrate processing can be reduced. Unlike FIG. 6D, the heater unit 6 may be placed in the contact position during the first polymer film heating step.
- the solvent in the polymer film 101 evaporates when the polymer film 101 is heated. Therefore, the concentration of the acidic polymer dissolved in the solvent in the polymer film 101 increases (polymer concentration step). As a result, the concentration of the acidic polymer is increased, and the removal rate of the first oxide layer by the action of the acidic polymer is improved.
- the heating temperature of the substrate W is preferably lower than the boiling point of the solvent in the polymer film 101 . If so, the solvent can be properly evaporated from the polymer film 101 on the substrate W. FIG. Therefore, the concentration of the acidic polymer dissolved in the solvent in the polymer film 101 can be increased. Furthermore, it is possible to prevent the solvent from completely evaporating and being completely removed from the polymer film 101 .
- the first polymer film removing step (step S5) is performed to remove the polymer film 101 on the substrate W.
- the heater unit 6 is retracted to the retracted position, and the rinse liquid valve 52A is opened.
- the rinse liquid is supplied (discharged) from the rinse liquid nozzle 11 toward the central region of the upper surface of the substrate W on which the polymer film 101 is formed ( rinse solution supply step, rinse solution discharge step).
- the rinse liquid discharged from the rinse liquid nozzle 11 lands on the central region of the upper surface of the substrate W. As shown in FIG.
- the substrate W While supplying the rinse liquid to the upper surface of the substrate W, the substrate W is rotated at a predetermined rinse speed (800 rpm, for example).
- the rinse liquid that has landed on the central region of the upper surface of the substrate W in the rotating state spreads from the central region of the substrate W toward the peripheral edge side.
- the polymer film 101 on the substrate W is dissolved by the rinse liquid that has landed on the upper surface of the substrate W (first polymer film dissolving step).
- first polymer film dissolving step By continuing to supply the rinse liquid to the substrate W, the polymer film 101 is removed from the upper surface of the substrate W (first polymer film removing step).
- the polymer film 101 is removed from the upper surface of the substrate W by the dissolving action of the rinse liquid and the flow of the rinse liquid formed on the upper surface of the substrate W.
- FIG. In this way, the main surface of the substrate W is washed with the rinse liquid (first rinse liquid) (first rinse step).
- the first liquid removing step (step S6) of removing the rinse liquid on the upper surface of the substrate W from the upper surface of the substrate W is performed.
- the rinse liquid valve 52A is closed, and the supply of the rinse liquid to the upper surface of the substrate W is stopped. Then, the spin motor 23 accelerates the rotation of the substrate W to rotate the substrate W at high speed.
- the substrate W is rotated at a predetermined drying speed, eg 1500 rpm. As a result, a large centrifugal force acts on the rinse liquid on the substrate W, and the rinse liquid on the substrate W is shaken off around the substrate W, as shown in FIG. 6F. Thereby, the upper surface of the substrate W is dried (drying step).
- the gas When removing the rinsing liquid from the upper surface of the substrate W, the gas may be discharged from the gas discharge port 38 provided in the opposing surface 35a of the blocking plate 35 toward the central region of the upper surface of the substrate W (gas discharge process ).
- the gas that has collided with the upper surface of the substrate W forms an airflow that spreads along the upper surface of the substrate W from the central region of the substrate W toward the peripheral edge side. This airflow can promote the removal of the rinse liquid on the substrate W.
- the first oxide layer may be further removed by forming the polymer film 101 on the top surface of the substrate W again. That is, after the first polymer film removing step (strictly speaking, the first liquid removing step), the first polymer film forming step (first etching step) and the first polymer film removing step (first rinsing step) are performed. It may be performed at least once more in order.
- a cycle process hereinafter sometimes referred to as "first cycle process” in which one cycle includes the step of supplying the first polymer-containing liquid (step S2) to the step of removing the first liquid (step S6). It may be performed more than once.
- “N” in FIG. 5 means an integer of 0 or more.
- the step of supplying the first polymer-containing liquid (step S2) to the step of removing the first liquid (step S6) are performed once each, and when “N" is 1 or more, the first polymer-containing The steps from the liquid supply step (step S2) to the first liquid removal step (step S6) are performed two or more times. That is, when "N" is 1 or more, the first cycle process is executed multiple times.
- step S6 when a desired amount of the first oxide layer can be removed by one first etching step, there is no need to perform the first cycle treatment, and the first solution is removed from the first polymer-containing solution supply step (step S2).
- the process (step S6) may be executed one time at a time.
- a single first etching step fails to remove the desired amount of the first oxide layer, it is preferable to perform the first cycle process.
- the first oxide layer is removed from the top surface of the substrate W to expose the layer to be processed.
- the first polymer film forming step (first oxide layer removing step) and the first polymer film removing step are alternately repeated.
- the first polymer film forming step (first oxide layer removing step) and the first polymer film removing step are alternately performed multiple times. Even if the formation and removal of the polymer film 101 once does not etch the first oxide layer 103 by a desired amount, the formation and removal of the polymer film 101 are performed a plurality of times to sufficiently remove the first oxide layer 103 . can be etched.
- the first oxide layer 103 may be removed from the substrate W by forming and removing the polymer film 101 multiple times.
- the spin motor 23 stops the rotation of the substrate W.
- the transport robot CR enters the wet processing unit 2W, receives the processed substrate W from the plurality of chuck pins 20, and carries it out of the wet processing unit 2W (substrate unloading step: step S7).
- the substrate W is transferred from the transport robot CR to the transport robot IR and stored in the carrier C by the transport robot IR.
- the first oxide layer 103 is removed from the substrate W by the acidic polymer in the polymer film 101 formed on the upper surface of the substrate W. After that, the upper surface of the substrate W is washed with the first rinse liquid, so that the polymer film 101 is removed from the upper surface of the substrate W.
- the polymer film 101 used for removing the first oxide layer 103 is semi-solid or solid, so it tends to stay on the upper surface of the substrate W compared to a liquid. Therefore, it is not necessary to continuously supply the acidic polymer-containing liquid to the upper surface of the substrate W during the entire period during which the first oxide layer 103 is removed. In other words, it is not necessary to additionally supply the acidic polymer-containing liquid to the upper surface of the substrate W, at least after the polymer film 101 is formed. Therefore, the amount of the acidic polymer that is required for etching the substrate W can be reduced. As a result, the amount of material used for etching the substrate can be reduced.
- the rinse liquid is removed from the upper surface of the substrate W after the polymer film 101 is removed by the rinse liquid and before the new polymer film 101 is formed. Therefore, removal of the polymer film 101 being formed by the rinse liquid remaining on the upper surface of the substrate W can be suppressed. As a result, the polymer film 101 can sufficiently exhibit the etching action of the substrate W, so that the etching amount of the substrate W can be increased by forming the polymer film once. As a result, the amount of substances required for etching the substrate W can be further reduced, so that the environmental load can be reduced.
- the polymer film 101 can be formed by evaporating the solvent from the polymer-containing liquid supplied to the upper surface of the substrate W. Therefore, the concentration of the acidic polymer in the polymer film 101 can be increased by evaporating the solvent. Therefore, a high-concentration acidic polymer can act on the first oxide layer 103 . Therefore, the substrate W can be etched quickly.
- the acidic polymer is a carboxy group-containing polymer, a sulfo group-containing polymer, a hydroxy group-containing polymer, or a mixture thereof. Therefore, water such as DIW can be used as a liquid for dissolving the acidic polymer. Therefore, it is not necessary to use an organic solvent as a solvent for dissolving the acidic polymer and as a rinsing liquid for removing the polymer film 101 . Therefore, the environmental load can be further reduced.
- the temperature of the etchant drops as the etchant moves from the center side of the upper surface of the substrate W toward the peripheral edge side. Therefore, the amount of etching in the peripheral region of the upper surface of the substrate W (the amount of removal of the first oxide layer 103) becomes smaller than the amount of etching in the central region of the upper surface of the substrate W due to the decrease in the temperature of the etchant. There is a possibility that the uniformity of the etching amount at each position on the upper surface of the is lowered.
- the entire upper surface of the substrate W is covered with a semi-solid or solid polymer film 101, and the first oxide layer 103 is removed by the action of the acidic polymer in the polymer film 101. be done. Therefore, in the state where the polymer film 101 is formed, the acid polymer does not move toward the peripheral edge side of the upper surface of the substrate W, so that the temperature of the portions of the polymer film 101 that are in contact with the respective positions on the upper surface of the substrate W is approximately change uniformly. Therefore, it is possible to improve the uniformity of the etching amount.
- the width L of the trench 122 formed on the upper surface of the substrate W is narrow, the trench 122 is filled. It may not be possible to sufficiently replace the liquid in the etching solution with the etchant. Therefore, when a plurality of trenches 122 having different widths L are formed on the upper surface of the substrate W, the degree of replacement of the liquid in the trenches 122 with the etchant varies. Quantity uniformity may be reduced.
- the polymer film 101 is formed so as to follow the layer 102 to be processed and the trench 122 regardless of the width L of the trench 122 .
- the polymer film 101 is formed along the surface 103 a of the first oxide layer 103 , the side surfaces 122 a of the trenches 122 and the tops 121 a of the structures 121 . Therefore, even when the trenches 122 having different widths L are formed, variations in the etching amount of the layer to be processed 102 between the trenches 122 can be reduced.
- Constituent material 116 is, for example, a molecule, typically a copper oxide molecule.
- the first oxide layer 103 is removed with an etchant containing a low-molecular-weight etching component 114 such as hydrofluoric acid
- a low-molecular-weight etching component 114 such as hydrofluoric acid
- the crystal grain boundaries 111 of the substrate W are exposed to The low-molecular-weight etching component 114 easily enters the gap 113 . Therefore, the first oxide layer 103 is easily removed at locations where the grain boundary density is high (within the trench 122 with a narrow width L), and the first oxide layer 103 is easily removed at locations with a low crystal grain boundary density (within the trench 122 with a wide width L). 103 is difficult to remove. Therefore, it is difficult to uniformly remove the first oxide layer 103, and the roughness of the upper surface of the substrate W may increase.
- a low-molecular-weight etching component 114 such as hydrofluoric acid
- the acidic polymer 115 which is a high-molecular-weight etching component, is less likely to enter the gaps 113 existing in the grain boundaries 111 than the low-molecular-weight etching component 114. Therefore, the first oxide layer 103 can be uniformly etched regardless of the grain boundary density. The roughness of the upper surface of the substrate W can be reduced by the first oxide layer 103 .
- the first oxide layer removing step is performed again after the first polymer film removing step.
- the polymer film 101 is formed again on the upper surface of the substrate W after the polymer film 101 formed on the upper surface of the substrate W is once removed. Therefore, by removing the first oxide layer 103 , the polymer film 101 in which the acidic polymer has been consumed can be removed from the upper surface of the substrate W, and the first oxide layer 103 can be removed with a new polymer film 101 .
- the amount of substances required for etching the substrate W can be reduced.
- the substrate W is Rinse liquid is removed from the top surface. Therefore, removal of the polymer film 101 being formed by the rinse liquid remaining on the upper surface of the substrate W can be suppressed.
- the polymer film 101 can sufficiently exhibit the effect of removing the first oxide layer 103, so that the removal amount of the first oxide layer 103 by one polymer film formation can be increased.
- the amount of substances required for etching the substrate W can be further reduced, so that the environmental load can be reduced.
- the acidic polymer in the polymer film 101 regains its activity and starts etching. Therefore, the substrate W can be etched with high precision. In particular, the start timing of etching of the substrate W can be controlled with high precision.
- the action of the conductive polymer can promote ionization of the acidic polymer in the polymer film 101 . Therefore, the acidic polymer can effectively act on the first oxide layer 103 .
- FIG. 9 is a schematic cross-sectional view for explaining a configuration example of a wet processing unit 2W provided in a substrate processing apparatus 1P according to the second embodiment.
- the substrate processing apparatus 1P according to the second embodiment is mainly different from the substrate processing apparatus 1 according to the first embodiment in that the wet processing unit 2W applies a hydrogen peroxide solution to the upper surface of the substrate W held by the spin chuck 5.
- an oxidizing agent nozzle 13 for supplying a liquid oxidizing agent such as is further provided.
- the liquid oxidizing agent is a liquid that oxidizes the surface layer portion of the processing target layer exposed from the upper surface of the substrate W to form a second oxidized layer on the surface layer portion of the processing target layer 102 .
- the second oxide layer formed by the liquid oxidant has a thickness of, for example, 1 nm or more and 2 nm or less.
- the second oxide layer is formed by oxidizing the layer to be processed. Therefore, when the layer to be processed is a metal layer, the second oxide layer is a metal oxide layer, and when the layer to be processed is a silicon layer, the second oxide layer is a silicon oxide layer.
- the second oxide layer has similar properties to the first oxide layer. Therefore, the second oxide layer can be removed by the acidic polymer in the polymer film 101.
- the liquid oxidizing agent includes, for example, a hydrogen peroxide solution (H 2 O 2 water) containing hydrogen peroxide (H 2 O 2 ) and an APM solution (ammonia-hydrogen peroxide solution mixture) as an oxidizing agent, and ozone as an oxidizing agent.
- a hydrogen peroxide solution H 2 O 2 water
- APM solution ammonia-hydrogen peroxide solution mixture
- ozone as an oxidizing agent.
- O3 water containing ( O3), and the like.
- the oxidizing agent does not necessarily have to be hydrogen peroxide or ozone.
- the oxidizing agent may be any oxidizing agent that can oxidize the processing target layer exposed from the upper surface of the substrate W.
- the liquid oxidant may contain multiple oxidants, specifically the liquid oxidant is formed by dissolving both hydrogen peroxide and ozone in water such as DIW It may be liquid.
- the oxidant nozzle 13 is an example of a substrate oxidation unit.
- the oxidant nozzle 13 is a mobile nozzle that can move at least horizontally.
- the oxidant nozzle 13 is horizontally moved by a second nozzle moving unit 34 having the same configuration as the first nozzle moving unit 33 .
- the oxidant nozzle 13 may be vertically movable.
- the oxidant nozzle 13 may be a fixed nozzle with fixed horizontal and vertical positions, unlike this embodiment.
- the oxidant nozzle 13 is connected to one end of an oxidant pipe 44 that guides the liquid oxidant to the oxidant nozzle 13 .
- the other end of the oxidant pipe 44 is connected to an oxidant tank (not shown).
- the oxidant pipe 44 is provided with an oxidant valve 54A that opens and closes a channel in the oxidant pipe 44, and an oxidant flow control valve 54B that adjusts the flow rate of the liquid oxidant in the channel. .
- the oxidant valve 54A When the oxidant valve 54A is opened, the liquid oxidant is continuously discharged downward from the outlet of the oxidant nozzle 13 at a flow rate corresponding to the degree of opening of the oxidant flow control valve 54B.
- FIG. 10 is a flowchart for explaining an example of substrate processing performed by the substrate processing apparatus 1P according to the second embodiment.
- 11A and 11B are schematic diagrams for explaining the state of the substrate W during substrate processing according to the second embodiment.
- step S6 the substrate processing according to the first embodiment.
- the substrate is The point is that a second oxide layer is formed on the surface layer portion of the upper surface of W, and then the second oxide layer is removed.
- FIGS. 9 and 10 Mainly referring to FIGS. 9 and 10, the differences between the substrate processing according to the second embodiment and the substrate processing according to the first embodiment (see FIG. 5) will be described in detail below. 11A and 11B will be referred to as appropriate.
- the liquid oxidizing agent is supplied (oxidizing treatment) to the upper surface of the substrate W (liquid oxidizing agent supplying step (oxidizing step): step S8 ).
- the second nozzle moving unit 34 moves the oxidant nozzle 13 to the processing position.
- the processing position of the oxidant nozzle 13 is, for example, the central position where the oxidant nozzle 13 faces the central region of the upper surface of the substrate W. As shown in FIG.
- the oxidant valve 54A is opened. Accordingly, as shown in FIG. 11A, the liquid oxidant is supplied (discharged) from the oxidant nozzle 13 toward the central region of the upper surface of the substrate W (liquid oxidant supply process, liquid oxidant discharge process).
- the liquid oxidant supplied to the upper surface of the substrate W spreads over the entire upper surface of the substrate W due to centrifugal force.
- the liquid oxidant that has reached the peripheral edge of the upper surface of the substrate W is discharged outside the substrate W from the peripheral edge of the upper surface of the substrate W.
- an oxidized layer is formed on the processing target layer exposed from the upper surface of the substrate W (second oxide layer forming step, wet oxidation step).
- the substrate W can be oxidized by a simple step of supplying the substrate W with a liquid oxidizing agent.
- the heater unit 6 may be used to heat the liquid oxidant through the substrate W while the liquid oxidant is being supplied to the upper surface of the substrate W. Specifically, the heater unit 6 is arranged at a close position to heat the substrate W during rotation. By heating the liquid oxidizing agent, the formation of the second oxide layer is promoted (second oxide layer formation promotion step). Unlike FIG. 11A, the heater unit 6 may be placed at the retracted position or the heater unit 6 may be placed at the contact position during supply of the liquid oxidant.
- the oxidant removing step (step S9) of supplying the rinsing liquid to the upper surface of the substrate W and removing the liquid oxidant from the upper surface of the substrate W is performed. Specifically, the oxidant valve 54A is closed and the rinse liquid valve 52A is opened. As a result, the supply of the liquid oxidant to the upper surface of the substrate W is stopped, and instead, the supply (discharge) of the rinse liquid from the rinse liquid nozzle 11 to the upper surface of the substrate W is started (rinse liquid supply step, rinsing liquid discharge step).
- the rinse liquid also functions as an oxidant removing liquid that removes the liquid oxidant on the upper surface of the substrate W.
- the second nozzle moving unit 34 moves the oxidant nozzle 13 to the retracted position.
- the oxidant nozzle 13 When positioned at the retracted position, the oxidant nozzle 13 does not face the upper surface of the substrate W, and is positioned outside the processing cup 7 in plan view.
- a second polymer-containing liquid supplying step (step S9), a second polymer film forming step (step S10), a second polymer film heating step (step S11), a second polymer film removing step (step S12), and a second liquid A removal step (step S13) is performed.
- Second polymer-containing liquid supply step (step S9), second polymer film formation step (step S10), second polymer film heating step (step S11), second polymer film removal step (step S12), and second liquid removal step (Step S13) includes a first polymer-containing liquid supplying step (step S2), a first polymer film forming step (step S3), a first polymer film heating step (step S4), and a first polymer film removing step (step S5) and the first liquid removing step (step S6) are the same steps, so detailed description is omitted.
- the substrate W is etched by the polymer film 101 (second polymer film) formed on the substrate W (second etching step), and the action of the acidic polymer in the polymer film 101 causes , at least part of the second oxide layer is removed from the upper surface of the substrate W (second oxide layer removing step).
- the second etching process (second oxide layer removing process) is started by heating the polymer film 101 (second etching starting process).
- the main surface of the substrate W is washed with a rinse (second rinse) (second rinse).
- the rinse liquid supplied to the upper surface of the substrate W in the second polymer film removing process functions as a second polymer removing liquid.
- the acidic polymer, alkaline component, and conductive polymer contained in the second polymer film are examples of the second acidic polymer, second alkaline component, and second conductive polymer, respectively.
- the second oxide layer may be formed and removed again. That is, after the second polymer film removing step (strictly speaking, the second liquid removing step), the liquid oxidizing agent supplying step (oxidizing step), the second polymer film forming step (second etching step) and the second polymer film removing step are performed.
- the steps (second rinse step) may be further performed at least once in this order.
- the cycle process from the liquid oxidizing agent supplying process (step S8) to the second liquid removing process (step S13) (hereinafter sometimes referred to as "second cycle process") is performed twice or more. good too.
- “M” in FIG. 10 means an integer of 0 or more. Therefore, the steps from the liquid oxidant supply step (step S8) to the second liquid removal step (step S13) are performed once each, and when "M" is 1 or more, the liquid oxidant supply step (step S8) to the second liquid removal step (step S13) are performed once. The steps up to the liquid removing step (step S13) are performed two or more times. That is, when "M" is 1 or more, the second cycle process is executed multiple times.
- the step of supplying the liquid oxidant (step of forming the second oxide layer) and the step of forming the second polymer film (step of removing the second oxide layer) are alternately repeated.
- the liquid oxidizing agent supply step (second oxide layer forming step) and the second polymer film forming step (second oxide layer removing step) are alternately performed multiple times.
- the spin motor 23 stops the rotation of the substrate W.
- the transport robot CR enters the wet processing unit 2W, receives the processed substrate W from the plurality of chuck pins 20, and carries it out of the wet processing unit 2W (substrate unloading step: step S7).
- the substrate W is transferred from the transport robot CR to the transport robot IR and stored in the carrier C by the transport robot IR.
- FIG. 12 is a schematic diagram for explaining changes in the surface layer of the upper surface of the substrate W due to alternate repetition of the oxidation process and the second etching process in the substrate processing according to the second embodiment.
- the second oxidized layer 106 is formed on the surface layer of the layer 102 to be processed. formed (second oxide layer forming step).
- the polymer-containing liquid is supplied to the upper surface of the substrate W, and at least part of the solvent in the polymer-containing liquid on the substrate W is evaporated, so that the polymer is deposited on the upper surface of the substrate W as shown in FIG.
- a film 101 (second polymer film) is formed (second polymer film forming step). After that, as shown in FIG.
- the polymer film 101 is heated to evaporate the alkali component and remove the alkali component from the polymer film 101 (alkali component evaporation process, alkali component removal process). Due to the action of the acidic polymer in the polymer film 101 on the upper surface of the substrate W, the second oxide layer 106 dissolves into the polymer film 101 . Thereby, as shown in FIG. 12(e), the second oxide layer 106 is selectively removed from the upper surface of the substrate W (second oxide layer removing step).
- FIG. 12(f) shows the state of the surface of the processing target layer 102 after the polymer film 101 has been removed.
- the thickness of the oxidized processing target layer 102 is substantially constant (FIG. 12). (b)). Therefore, the thickness (etching amount D1) of the etched second oxide layer 106 is also substantially constant (see FIG. 12(e)).
- the desired etching amount (the same amount as the thickness D2) is achieved by adjusting the number of repetitions of the oxidation step (second oxide layer forming step) and the second etching step (second oxide layer removing step). be able to.
- Etching the processing target layer 102 step by step with a constant etching amount in this way is called digital etching.
- Etching the processing target layer 102 (the surface layer portion of the upper surface of the substrate W) by repeatedly performing the second oxide layer forming step and the second oxide layer removing step is called cycle etching.
- the substrate W is oxidized, and then the substrate W is etched. Therefore, the substrate W can be additionally etched to ensure a sufficient etching amount. Therefore, the substrate W can be etched even better.
- the second oxide layer 106 is formed on the surface layer portion of the processing target layer 102 .
- the polymer film 101 is formed and removed, thereby removing the second oxide layer 106 from the treatment target layer 102 .
- both the previously formed first oxide layer 103 and the second oxide layer 106 formed in the second oxide layer forming step are removed. Therefore, when the etching amount of the substrate W is insufficient only by removing the first oxide layer 103, the layer to be processed 102 is oxidized to additionally form the second oxide layer 106, and the second oxide layer 106 is formed. By removing , a sufficient etching amount can be ensured.
- the polymer film 101 is used in the same manner as when removing the first oxide layer 103 . Therefore, the amount of material used for etching the substrate W can be reduced.
- the second cycle process is performed multiple times in the second embodiment, after the second rinsing process, the oxidation process, the second etching process, and the second rinsing process are further performed at least once in this order. . That is, the formation and removal of the second oxide layer 106 are alternately performed multiple times. Therefore, formation and removal of a small amount of the second oxide layer 106 (for example, 1 nm or more and 10 nm or less) can be repeated. Therefore, it is easier to adjust the amount of etching of the substrate W than when a large amount of the second oxide layer 106 is formed and removed at once. As a result, the substrate W can be etched with high accuracy.
- the acidic polymer in the polymer film 101 regains its activity, and etching starts. be done. Therefore, the substrate W can be etched with high precision. In particular, the start timing of etching of the substrate W can be controlled with high precision.
- the ionization of the acidic polymer in the polymer film 101 can be promoted by the action of the conductive polymer also in the second etching step. Therefore, the acidic polymer can effectively act on the first oxide layer 103 .
- the polymer-containing liquid contains an acidic polymer, an alkaline component, and a conductive polymer as solutes. However, the polymer-containing liquid does not have to contain the alkaline component and the conductive polymer. The polymer-containing liquid may not contain, as a solute, either the alkaline component or the conductive polymer in addition to the acidic polymer.
- the means for heating the polymer film 101 is not limited to the heater unit 6.
- the means for heating the polymer film 101 may be a heater facing the upper surface of the substrate W, although not shown. 13, the polymer film 101 is heated through the substrate W by supplying a heating fluid to the lower surface of the substrate W from a heating fluid nozzle 14 facing the lower surface of the substrate W. It may be configured to heat 101 .
- the heated fluid discharged from the heated fluid nozzle 14 is, for example, high-temperature DIW having a temperature higher than room temperature and lower than the boiling point of the solvent contained in the polymer-containing liquid.
- the solvent contained in the polymer-containing liquid is DIW
- DIW at a temperature of 60° C. or more and less than 100° C. is used as the heating fluid, for example.
- the heated fluid discharged from the heated fluid nozzle 14 is not limited to high-temperature DIW, and is a high-temperature gas such as a high-temperature inert gas or high-temperature air having a temperature higher than normal temperature and lower than the boiling point of the solvent contained in the polymer-containing liquid. may be
- the heating fluid nozzle 14 is inserted into the through hole 21a of the spin base 21, for example.
- a discharge port 14a of the heating fluid nozzle 14 faces the central region of the lower surface of the substrate W from below.
- the heated fluid nozzle 14 is connected to a heated fluid pipe 45 that guides the heated fluid to the heated fluid nozzle 14 .
- the heating fluid pipe 45 is provided with a heating fluid valve 55A for opening and closing the flow path in the heating fluid pipe 45, and a heating fluid flow control valve 55B for adjusting the flow rate of the heating fluid in the heating fluid pipe 45.
- a heater 55C temperature adjustment unit that adjusts the temperature of the heating fluid supplied to the heating fluid nozzle 14 may be provided.
- the heating of the polymer film 101 may be started in a state in which the atmosphere in contact with the substrate W is replaced with an inert gas such as nitrogen gas. .
- an inert gas such as nitrogen gas.
- the heating of the polymer film 101 may be started while the atmosphere in contact with the substrate W is replaced with an inert gas such as nitrogen gas.
- the spin chuck 5 is not limited to a gripping type, and may be, for example, a vacuum suction type vacuum chuck (not shown).
- the vacuum chuck holds the substrate W in a holding position in a horizontal posture by vacuum-adsorbing the back surface of the substrate W, and rotates around the vertical rotation axis in that state, thereby holding the substrate W on the spin chuck 5.
- the substrate W is rotated.
- the polymer film 101 is formed on the upper surface of the substrate W by supplying the polymer-containing liquid to the upper surface of the substrate W and then evaporating the solvent from these liquids.
- the polymer film 101 may be formed on the upper surface of the substrate W by coating the upper surface of the substrate W with a semi-solid polymer film 101 .
- the surface layer portion of the main surface of the substrate W used for the substrate processing according to the above-described embodiment need not have the structure shown in FIG.
- the processing target layer 102 may be exposed from the entire main surface of the substrate W, and the uneven pattern 120 may not be formed.
- the layer to be processed 102 need not be composed of a single substance, and may be composed of a plurality of substances.
- the first polymer film heating step (step S4) may be appropriately omitted in the substrate processing (see FIG. 5) according to the first embodiment described above.
- the substrate W is rinsed from the upper surface by stopping the supply of the rinse liquid without accelerating the rotation of the substrate W. Liquid can be removed. In this case, the rinse liquid is not removed to the extent that the upper surface of the substrate W is dried, and a small amount of the rinse liquid remains on the upper surface of the substrate W.
- the acceleration of the rotation of the substrate W can be omitted, the time required for substrate processing can be reduced. can.
- step S6 it is preferable to accelerate the rotation of the substrate W to the drying speed. If so, the substrate W can be unloaded from the wet processing unit 2W with the upper surface of the substrate W sufficiently dried.
- the first polymer film heating step (step S4) and the second polymer film heating step (step S12) may be omitted as appropriate in the substrate processing (see FIG. 10) according to the second embodiment described above.
- the supply of the rinse liquid is stopped without accelerating the rotation of the substrate W.
- the rinse liquid may be removed from the top surface of the substrate W by doing so. In this case, the rinse liquid is not removed to the extent that the upper surface of the substrate W is dried, and a small amount of the rinse liquid remains on the upper surface of the substrate W.
- the acceleration of the rotation of the substrate W can be omitted, the time required for substrate processing can be reduced. can.
- step S13 it is preferable to accelerate the rotation of the substrate W to the drying speed. If so, the substrate W can be unloaded from the wet processing unit 2W with the upper surface of the substrate W sufficiently dried.
- a second oxide layer is formed by supplying a liquid oxidizing agent. That is, as the oxidation treatment, a liquid oxidizing agent is supplied.
- the oxidation treatment is not limited to supplying a liquid oxidant, and the second oxide layer may be formed by a dry oxidation process using no liquid.
- a dry oxidation step may be formed, for example, by light irradiation (eg, UV irradiation), heating, gaseous oxidants, and the like.
- the gaseous oxidant is, for example, gaseous oxidant such as ozone gas.
- the oxidation step (step S8) is performed after the second liquid removal step (step S13). ) without returning to the step of supplying the second polymer-containing liquid (step S9) (see the chain double-dashed line in FIG. 10). That is, the step of supplying the second polymer-containing liquid (step S9) to the step of removing the second liquid (step S13) may be performed once each.
- the second polymer film formation step and the second polymer film-containing liquid supply step are further performed at least once in this order. Since the second etching process is further performed after the second polymer film removing process, the polymer film 101 formed on the upper surface of the substrate W is once removed, and the polymer film 101 is formed again on the upper surface of the substrate. Therefore, by removing the second oxide layer 106 , the polymer film 101 in which the acidic polymer has been consumed can be removed from the upper surface of the substrate W, and the second oxide layer 106 can be removed with the new polymer film 101 .
- the second oxide layer 106 can be etched by forming and removing the polymer film 101 a plurality of times. Sufficient etching is possible.
- the second oxide layer 106 may be exhausted from the substrate W by forming and removing the polymer film 101 multiple times.
- the acidic polymer in the first polymer film formed on the upper surface of the substrate W by the first polymer film forming process and the second polymer film formed on the upper surface of the substrate W by the second polymer film forming process may be a different substance.
- the removal of the first polymer film and the second polymer film is performed by supplying a rinse liquid.
- the first polymer film and the second polymer film may be removed by plasma treatment or light irradiation treatment that irradiates light such as UV.
- each component in the first polymer film (first acidic polymer, first alkaline component, first conductive polymer) and each corresponding component in the second polymer film (second acidic polymer, second alkaline component, second The two conductive polymers) may be different from each other. In that case, it is necessary to prepare a polymer-containing liquid for forming the first polymer film and a polymer-containing liquid for forming the second polymer film.
- the upper surface of the substrate W is subjected to substrate processing including etching with the polymer film 101 .
- substrate processing may be performed on the lower surface of the substrate W, unlike the above-described embodiments.
- the substrate processing apparatuses 1 and 1P include the transfer robots IR and CR, a plurality of processing units 2, and the controller 3.
- the substrate processing apparatuses 1 and 1P are configured by a single processing unit 2 and controller 3, and may not include the transfer robots IR and CR.
- the substrate processing apparatus 1 may be configured with only a single processing unit 2 .
- the processing unit 2 may be an example of a substrate processing apparatus.
- each configuration may be schematically indicated by a block, but the shape, size and positional relationship of each block do not indicate the shape, size and positional relationship of each configuration. .
- substrate processing apparatus 1P substrate processing apparatus 2: processing unit (substrate processing apparatus) 10: polymer-containing liquid nozzle (polymer film forming unit) 11: rinse liquid nozzle (polymer removal liquid supply unit) 101: polymer film (first polymer film, second polymer film) 102: Layer to be processed (surface layer of main surface of substrate) 103: first oxide layer 106: second oxide layer 115: acidic polymer W: substrate
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Abstract
Description
図1は、処理対象となる基板Wの表層部の構造を説明するための模式的な断面図である。基板Wは、シリコンウエハ等の基板であり、一対の主面を有する。一対の主面のうち少なくとも一方が、凹凸パターン120が形成されたデバイス面である。一対の主面のうちの一方は、凹凸パターン120が形成されていない非デバイス面であってもよい。
図2Aは、この発明の第1実施形態に係る基板処理装置1の構成を説明するための平面図である。図2Bは、基板処理装置1の構成を説明するための立面図である。
図5は、基板処理装置1によって実行される基板処理の一例を説明するための流れ図である。図6A~図6Fは、基板処理装置1によって実行される基板処理の各工程の様子を説明するための模式図である。
図9は、第2実施形態に係る基板処理装置1Pに備えられるウェット処理ユニット2Wの構成例を説明するための模式的な断面図である。
この発明は、以上に説明した実施形態に限定されるものではなく、さらに他の形態で実施することができる。
1P :基板処理装置
2 :処理ユニット(基板処理装置)
10 :ポリマー含有液ノズル(ポリマー膜形成ユニット)
11 :リンス液ノズル(ポリマー除去液供給ユニット)
101 :ポリマー膜(第1ポリマー膜、第2ポリマー膜)
102 :処理対象層(基板の主面の表層部)
103 :第1酸化層
106 :第2酸化層
115 :酸性ポリマー
W :基板
Claims (14)
- 第1酸化層が露出する主面を有する基板を準備する基板準備工程と、
第1酸性ポリマーを含有する第1ポリマー膜を前記基板の主面上に形成して前記基板をエッチングする第1エッチング工程と、
前記第1エッチング工程の後に、前記基板の主面を洗浄する第1リンス液を前記基板の主面に供給する第1リンス工程とを含む、基板処理方法。 - 前記第1ポリマー膜が、第1アルカリ成分をさらに含有し、
前記第1エッチング工程が、前記第1ポリマー膜が形成された後、前記第1ポリマー膜を加熱して前記第1ポリマー膜から前記第1アルカリ成分を蒸発させることによって前記基板のエッチングを開始する第1エッチング開始工程を含む、請求項1に記載の基板処理方法。 - 前記第1ポリマー膜が、第1導電性ポリマーをさらに含有する、請求項1または2に記載の基板処理方法。
- 前記第1エッチング工程が、前記第1ポリマー膜中の前記第1酸性ポリマーによって前記第1酸化層の少なくとも一部を除去する第1酸化層除去工程を含み、
前記第1リンス工程が、前記第1リンス液によって、前記基板の主面から前記第1ポリマー膜を除去する第1ポリマー膜除去工程を含む、請求項1~3のいずれか一項に記載の基板処理方法。 - 前記第1リンス工程の後に、前記第1エッチング工程および前記第1リンス工程が、この順番でさらに少なくとも1回ずつ実行される、請求項1~4のいずれか一項に記載の基板処理方法。
- 前記第1リンス工程の後、次の前記第1エッチング工程が開始される前に、前記基板の主面から前記第1リンス液を除去する第1液除去工程をさらに含む、請求項5に記載の基板処理方法。
- 前記第1エッチング工程の前に、溶媒および前記第1酸性ポリマーを含有するポリマー含有液を前記基板の主面に供給するポリマー含有液供給工程をさらに含み、
前記第1エッチング工程が、前記基板の主面上のポリマー含有液中の溶媒の少なくとも一部を蒸発させることによって前記第1ポリマー膜を形成する工程を含む、請求項1~6のいずれか一項に記載の基板処理方法。 - 最後の前記第1リンス工程の後に、前記基板の主面に対して酸化処理を実行する酸化工程と、
前記酸化工程の後に、第2酸性ポリマーを含有する半固体状または固体状の第2ポリマー膜を前記基板の主面上に形成して前記基板をエッチングする第2エッチング工程と、
前記第2エッチング工程の後に、第2リンス液を前記基板の主面に供給する第2リンス工程とをさらに含む、請求項1~7のいずれか一項に記載の基板処理方法。 - 前記第2ポリマー膜が、第2アルカリ成分をさらに含有し、
前記第2エッチング工程が、前記第2ポリマー膜が形成された後、前記第2ポリマー膜を加熱して前記第2ポリマー膜から前記第2アルカリ成分を蒸発させることによって前記基板のエッチングを開始する第2エッチング開始工程を含む、請求項8に記載の基板処理方法。 - 前記第2ポリマー膜が、第2導電性ポリマーをさらに含有する、請求項8または9に記載の基板処理方法。
- 前記酸化工程が、前記基板の主面の表層部に第2酸化層を形成する第2酸化層形成工程を含み、
前記第2エッチング工程が、前記第2ポリマー膜中の前記第2酸性ポリマーによって前記第2酸化層の少なくとも一部を除去する第2酸化層除去工程を含み、
前記第2リンス工程が、前記第2エッチング工程の後に、前記第2リンス液によって、前記第2ポリマー膜を前記基板の主面から除去する第2ポリマー膜除去工程を含む、請求項8~10のいずれか一項に記載の基板処理方法。 - 前記第2リンス工程の後に、前記酸化工程、前記第2エッチング工程および前記第2リンス工程が、この順番でさらに少なくとも1回ずつ実行される、請求項8~11のいずれか一項に記載の基板処理方法。
- 前記第1酸性ポリマーが、カルボキシ基含有ポリマー、スルホ基含有ポリマーまたはこれらの混合物である、請求項1~12のいずれか一項に記載の基板処理方法。
- 酸化層が露出する主面を有する基板をエッチングする基板処理装置であって、
酸性ポリマーを含有するポリマー膜を前記基板の主面上に形成するポリマー膜形成ユニットと、
前記基板の主面を洗浄するリンス液を前記基板の主面に供給するリンス液供給ユニットとを含む、基板処理装置。
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US20100035436A1 (en) * | 2008-08-08 | 2010-02-11 | Go-Un Kim | Composition for etching silicon oxide layer, method for etching semiconductor device using the same, and composition for etching semiconductor device |
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