WO2020045302A1 - 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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- WO2020045302A1 WO2020045302A1 PCT/JP2019/033124 JP2019033124W WO2020045302A1 WO 2020045302 A1 WO2020045302 A1 WO 2020045302A1 JP 2019033124 W JP2019033124 W JP 2019033124W WO 2020045302 A1 WO2020045302 A1 WO 2020045302A1
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- substrate
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- metal
- deprotection
- heat treatment
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- H10P76/405—
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- H10P50/00—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- H10P72/0458—
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- H10P76/00—
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- H10P76/4085—
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- H10W70/042—
Definitions
- the exemplary embodiments of the present disclosure relate to a substrate processing method and a substrate processing apparatus.
- the process of manufacturing a semiconductor includes a step of forming a resist pattern for etching on the surface of a wafer (substrate).
- the resist pattern is formed by exposing and developing a resist film formed on the surface of the substrate.
- Patent Document 1 discloses that a mask material solution containing a metal oxide is applied directly below a resist film, and the mask material is formed by heating, and then a resist film is formed on the mask material to form a resist pattern. Have been.
- the exemplary embodiments of the present disclosure provide a substrate processing method and a substrate processing apparatus in which the uniformity of the line width of a resist pattern is improved.
- a substrate processing method is a substrate processing method for a substrate on which a metal-containing liquid for a film below a resist is applied, wherein a heat treatment is performed on the substrate on which the metal-containing liquid is applied.
- a deprotection promoting step of promoting deprotection of a functional group in the film material included in the substrate to which the metal-containing liquid has been applied, and the metal-containing liquid included in the metal-containing liquid of the substrate A solvent removing step of removing the solvent to be removed, and a moisture absorbing step of bringing the surface of the substrate into contact with moisture.
- FIG. 1 is a perspective view illustrating a substrate processing system according to one exemplary embodiment.
- FIG. 2 is a schematic diagram illustrating an internal configuration of the substrate processing system according to one exemplary embodiment.
- FIG. 3 is a block diagram showing a main part of the substrate processing system.
- FIG. 4 is a schematic diagram illustrating a hardware configuration of the control device.
- FIG. 5 is a flowchart illustrating a substrate processing method according to one exemplary embodiment.
- FIG. 6 is a flowchart illustrating a substrate processing method according to a modification.
- FIG. 7 is a schematic diagram of a processing module of a substrate processing system according to a modification.
- 8A, 8B, 8C, and 8D are diagrams showing evaluation results of the line width of the resist pattern of the substrate according to the comparative example and the example.
- 9 (A), 9 (B), 9 (C) and 9 (D) are diagrams showing the evaluation results of the thickness of the metal hard mask of the substrate according to the comparative example and the example.
- the substrate processing method is a substrate processing method for a substrate on which a metal-containing liquid for a film below a resist is applied, wherein a heat treatment is performed on the substrate on which the metal-containing liquid is applied.
- a deprotection promoting step of promoting deprotection of a functional group in the film material included in the substrate to which the metal-containing liquid has been applied, and the metal-containing liquid included in the metal-containing liquid of the substrate A solvent removing step of removing the solvent to be removed, and a moisture absorbing step of bringing the surface of the substrate into contact with moisture.
- a deprotection promoting step of promoting deprotection of a functional group in the material for the film, and a solvent contained in the metal-containing liquid are performed before the heat treatment step on the substrate coated with the metal-containing liquid.
- a solvent removing step of removing and a moisture absorbing step of bringing the surface of the substrate into contact with moisture are performed.
- the step of promoting deprotection is a step of irradiating the substrate with ultraviolet light
- the step of removing the solvent is a step of drying the substrate.
- the characteristics of the film formed by the metal-containing liquid are further improved and provided above the film.
- the uniformity of the line width of the resist pattern in the resist film is improved.
- the moisture absorbing step is performed after the solvent removing step.
- the moisture absorption step is performed after the deprotection promotion step and the solvent removal step.
- the heat treatment step can be performed in a state where the moisture present around the material of the film in the moisture absorption step is prevented from drying and decreasing. Therefore, the effect of promoting a reaction using moisture in the material of the film is enhanced.
- the step of removing a solvent is performed after the step of promoting deprotection.
- the step of promoting deprotection is performed after the step of removing the solvent.
- the deprotection promotion step is performed after the solvent is removed to some extent from the metal-containing liquid. Therefore, since the deprotection promoting step can be performed in a state where the proportion of the solvent in the metal-containing liquid applied on the substrate is reduced, it is possible to prevent the solvent from adhering to the device performing the deprotection promoting step. In addition, the frequency of maintenance can be suppressed.
- the step of promoting deprotection is performed in a low oxygen atmosphere.
- a substrate processing apparatus includes: a liquid processing unit that applies a metal-containing liquid for a film below a resist to a substrate; and a liquid processing unit that applies the metal-containing liquid to the substrate.
- a deprotection promoting unit that promotes deprotection of a functional group in the material
- a solvent removing unit that removes a solvent contained in the metal-containing liquid of the substrate, and a surface and moisture of the substrate on which the metal-containing liquid is applied.
- a heat treatment unit that performs a heat treatment on the substrate after the treatment by the moisture absorption treatment unit.
- the deprotection promotion unit before the heat treatment by the heat treatment unit, the promotion of deprotection of the functional group in the material for the film by the deprotection promotion unit, and the removal of the solvent contained in the metal-containing liquid by the solvent removal unit.
- the removal the contact between the surface of the substrate and moisture by the moisture absorbing section, and the moisture absorbing processing are performed.
- the deprotection promoting unit, the solvent removing unit, the moisture absorbing unit, and the heating unit are configured by the same processing module, and within the processing module, the solvent removing unit, The moisture absorption section and the heating section are provided in the same processing chamber, and the same heating mechanism is used as the solvent removing section and the heating section.
- the deprotection promoting unit, the solvent removing unit, the moisture absorption unit, and the heat treatment unit are configured by the same processing module, so that the processing related to the formation of the film using the metal-containing liquid is performed by the same processing module. Therefore, the movement of the substrate in the apparatus can be reduced.
- the solvent removing section, the moisture absorbing section, and the heat treating section are provided in the same processing chamber, the solvent atmosphere, moisture, and the like generated at the time of the operation performed by each section may be different from other parts of the other processing chamber. Can be prevented. Further, by using the same heating mechanism as the solvent removing section and the heating processing section, a series of simpler processing can be performed.
- the substrate processing system 1 is a system that forms a photosensitive film on a substrate, exposes the photosensitive film, and develops the photosensitive film.
- the substrate to be processed is, for example, a semiconductor wafer W.
- the photosensitive film is, for example, a resist film.
- the substrate processing system 1 includes a coating / developing device 2 and an exposure device 3.
- the exposure device 3 performs an exposure process on a resist film (photosensitive film) formed on the wafer W (substrate). Specifically, an energy beam is applied to a portion to be exposed of the resist film by a method such as liquid immersion exposure.
- the coating / developing device 2 performs a process of forming a resist film on the surface of the wafer W (substrate) before the exposure process by the exposure device 3, and performs a developing process of the resist film after the exposure process.
- the coating / developing device 2 includes a carrier block 4, a processing block 5, an interface block 6, and a control device 100.
- the carrier block 4 introduces the wafer W into the coating and developing device 2 and derives the wafer W from the coating and developing device 2.
- the carrier block 4 can support a plurality of carriers C for the wafer W and has a built-in transfer arm A1.
- the carrier C accommodates a plurality of circular wafers W, for example.
- the transfer arm A1 takes out the wafer W from the carrier C and passes it to the processing block 5, receives the wafer W from the processing block 5, and returns the wafer W into the carrier C.
- the processing block 5 has a plurality of processing modules 11, 12, 13, and 14.
- the processing module 11 includes a liquid processing unit U1, a heat treatment unit U2, a light irradiation unit U3, and a transfer arm A3 for transferring a wafer W to these units.
- the processing modules 12 and 13 include a liquid processing unit U1, a heat treatment unit U2, and a transfer arm A3 for transferring a wafer W to these units.
- the processing module 11 forms a lower film on the surface of the wafer W and an intermediate film on the lower film by the liquid processing unit U1, the heat treatment unit U2, and the light irradiation unit U3.
- the liquid processing unit U1 of the processing module 11 applies a processing liquid for forming a lower layer film and an intermediate film onto the wafer W.
- the heat treatment unit U2 of the treatment module 11 performs various heat treatments associated with the formation of the lower film and the intermediate film.
- the light irradiation unit U3 of the processing module 11 irradiates the wafer W with light (ultraviolet light) when the lower layer film is formed. Details of the processing by the processing module 11 will be described later.
- Examples of the lower layer film include an antireflection (SiARC) film.
- the intermediate film examples include an SOC (Spin On Carbon) film and a metal-containing hard mask (metal hard mask).
- SOC Spin On Carbon
- metal hard mask metal-containing hard mask
- a case where the above-described metal hard mask is formed as an intermediate film provided immediately below a resist film will be described.
- the lower layer film may be omitted.
- the metal hard mask besides a TiN film, an alloy film or the like obtained by combining a plurality of metal materials can be used.
- the material of the metal hard mask described in the present embodiment is not particularly limited.
- the steps of forming a metal hard mask are roughly as follows. A metal-containing liquid in which a metal material constituting the metal hard mask is mixed in a solvent is applied on the wafer W, and the applied metal-containing liquid is subjected to a heat treatment to harden the material of the metal hard mask. As a result, a film is formed.
- the characteristics of the metal hard mask are improved by performing a deprotection promoting step, a solvent removing step, and a moisture absorbing step.
- the liquid processing unit U1 in the processing module 11 has a function as a liquid processing unit in the substrate processing apparatus (coating / developing apparatus 2) according to the present embodiment. Further, the heat treatment unit U2 has a function as a solvent removing unit in the coating and developing device 2. Further, the light irradiation unit U3 has a function as a deprotection promoting unit in the coating / developing device 2.
- the processing module 12 forms a resist film on the intermediate film by the liquid processing unit U1 and the heat treatment unit U2.
- the liquid processing unit U1 of the processing module 12 applies a processing liquid for forming a resist film on the intermediate film.
- the heat treatment unit U2 of the processing module 12 performs various heat treatments associated with the formation of the resist film. As a specific example of the heat treatment, a heat treatment (PAB: Pre Applied Bake) for curing the coating film to form a resist film R can be given.
- PAB Pre Applied Bake
- the processing module 13 forms an upper layer film on the resist film by the liquid processing unit U1 and the heat treatment unit U2.
- the liquid processing unit U1 of the processing module 13 applies a liquid for forming an upper layer film on the resist film.
- the heat treatment unit U2 of the treatment module 13 performs various heat treatments associated with the formation of the upper layer film.
- the processing module 14 includes a developing unit U4, a heat treatment unit U5, and a transfer arm A3 for transferring a wafer W to these units.
- the processing module 14 performs development processing of the exposed resist film by the developing unit U4 and the heat treatment unit U5.
- the developing unit U4 performs a developing process of the resist film by applying a developing solution on the surface of the exposed wafer W and then washing the developing solution with a rinsing solution.
- the heat treatment unit U5 performs various heat treatments associated with the development processing. Specific examples of the heat treatment include a heat treatment before the development treatment (PEB: Post Exposure Bake), a heat treatment after the development treatment (PB: Post @ Bake), and the like.
- the developing unit U4 in the processing module 14 has a function as a moisture absorbing unit in the coating / developing apparatus 2 as the substrate processing apparatus according to the present embodiment.
- the function as the moisture absorption processing unit may be performed by a module or a unit different from the developing unit U4 in the processing module 14.
- a module having a function as a moisture absorption processing section for example, a substrate cleaning module 15 shown in FIG.
- the substrate cleaning module 15 is a module that performs a cleaning process using, for example, pure water to remove droplets (PER: Post Immersion Rinse) remaining on the substrate after the immersion exposure and to reduce uneven heating in the pre-development heating process. is there.
- PER Post Immersion Rinse
- another module or unit that performs processing using pure water may be used as the moisture absorption processing unit.
- a shelf unit U10 is provided on the carrier block 4 side in the processing block 5.
- the shelf unit U10 is partitioned into a plurality of cells arranged vertically.
- An elevating arm A7 is provided near the shelf unit U10. The elevating arm A7 elevates and lowers the wafer W between cells of the shelf unit U10.
- a shelf unit U11 is provided on the interface block 6 side in the processing block 5.
- the shelf unit U11 is partitioned into a plurality of cells arranged vertically.
- the above-described substrate cleaning module 15 is provided near the shelf unit U11.
- the interface block 6 exchanges the wafer W with the exposure apparatus 3.
- the interface block 6 has a built-in transfer arm A8 and is connected to the exposure apparatus 3.
- the transfer arm A8 transfers the wafer W placed on the shelf unit U11 to the exposure device 3, receives the wafer W from the exposure device 3, and returns the wafer W to the shelf unit U11.
- the control device 100 controls the coating / developing device 2 to execute the coating / developing process in the following procedure, for example. First, the control device 100 controls the transfer arm A1 so as to transfer the wafer W in the carrier C to the shelf unit U10, and controls the elevating arm A7 to arrange the wafer W in the cell for the processing module 11.
- control device 100 controls the transfer arm A3 to transfer the wafer W in the shelf unit U10 to the liquid processing unit U1, the heat treatment unit U2, and the light irradiation unit U3 in the processing module 11.
- control device 100 controls the liquid processing unit U1, the heat treatment unit U2, and the light irradiation unit U3 to form a lower layer film on the surface of the wafer W, and further form an intermediate film on the lower layer film.
- control. controls the transfer arm A3 to return the wafer W on which the lower layer film and the intermediate film are formed to the shelf unit U10, and raises and lowers the arm A7 so that the wafer W is arranged in the cell for the processing module 12. Control. If necessary, the control device 100 can move the wafer W with respect to the processing module 14 to perform a process required for forming a metal hard mask as an intermediate film.
- control device 100 controls the transfer arm A3 to transfer the wafer W in the shelf unit U10 to the liquid processing unit U1 and the heat treatment unit U2 in the processing module 12. Further, control device 100 controls liquid processing unit U1 and heat treatment unit U2 so as to form a resist film on the surface of wafer W. Thereafter, the control device 100 controls the transfer arm A3 to return the wafer W to the shelf unit U10, and controls the lifting arm A7 to arrange the wafer W in the cell for the processing module 13.
- control device 100 controls the transfer arm A3 so as to transfer the wafer W of the shelf unit U10 to each unit in the processing module 13. Further, control device 100 controls liquid processing unit U1 and heat treatment unit U2 so as to form an upper layer film on the resist film of wafer W. Thereafter, control device 100 controls transfer arm A3 to transfer wafer W to shelf unit U11.
- control device 100 controls the transfer arm A8 so as to send out the wafer W in the shelf unit U11 to the exposure device 3. After that, the control device 100 controls the transfer arm A8 so as to receive the wafer W on which the exposure processing has been performed from the exposure device 3 and arrange the wafer W in the cell for the processing module 14 in the shelf unit U11.
- control device 100 controls the transfer arm A3 to transfer the wafer W of the shelf unit U11 to each unit in the processing module 14, and performs the developing unit U4 and the developing unit U4 so as to perform the developing process on the resist film of the wafer W.
- the heat treatment unit U5 is controlled.
- control device 100 controls the transfer arm A3 to return the wafer W to the shelf unit U10, and controls the lifting arm A7 and the transfer arm A1 to return the wafer W to the carrier C.
- the coating / developing process is completed.
- the specific configuration of the substrate processing apparatus is not limited to the configuration of the coating / developing apparatus 2 exemplified above.
- the substrate processing apparatus may be of any type as long as it includes the heat treatment unit U2 or the heat treatment unit U5 and the control device 100 capable of controlling the same.
- the control device 100 includes a reading unit M1, a storage unit M2, a processing unit M3, and an instruction unit M4 as functional modules.
- These functional modules merely divide the functions of the control device 100 into a plurality of modules for convenience, and do not necessarily mean that the hardware constituting the control device 100 is divided into such modules.
- Each functional module is not limited to being realized by executing a program, but may be realized by a dedicated electric circuit (for example, a logic circuit) or an integrated circuit (ASIC: Application Specific Integrated Circuit) integrating the same. You may.
- the reading unit M1 reads a program from a computer-readable recording medium RM.
- the recording medium RM records a program for operating each unit of the substrate processing system 1.
- the recording medium RM may be, for example, a semiconductor memory, an optical recording disk, a magnetic recording disk, or a magneto-optical recording disk.
- the storage unit M2 stores various data.
- the storage unit M2 is, for example, a program read from the recording medium RM in the reading unit M1, various data for processing the wafer W (a so-called processing recipe), and input from an operator via an external input device (not shown).
- the setting data and the like are stored.
- the processing unit M3 processes various data.
- the processing unit M3 is, for example, an operation for operating the liquid processing unit U1, the heat treatment unit U2, the light irradiation unit U3, the development unit U4, and the heat treatment unit U5 based on various data stored in the storage unit M2. Generate a signal.
- the instruction unit M4 transmits the operation signal generated by the processing unit M3 to various devices.
- the hardware of the control device 100 is constituted by, for example, one or a plurality of control computers.
- the control device 100 has a circuit 120 shown in FIG.
- the circuit 120 includes one or more processors 121, a memory 122, a storage 123, an input / output port 124, and a timer 125.
- the storage 123 has a computer-readable storage medium such as a hard disk.
- the storage medium stores a program for causing the exposure / developing apparatus 2 to execute a substrate processing procedure described later.
- the storage medium may be a removable medium such as a nonvolatile semiconductor memory, a magnetic disk, and an optical disk.
- the memory 122 temporarily stores the program loaded from the storage medium of the storage 123 and the calculation result by the processor 121.
- the processor 121 configures each of the above-described functional modules by executing the above-described program in cooperation with the memory 122.
- the input / output port 124 performs input / output of an electric signal with each unit of the substrate processing system 1 according to a command from the processor 121.
- the timer 125 measures the elapsed time by counting, for example, a reference pulse having a constant period.
- the control device 100 controls the liquid processing unit U1, the heat treatment unit U2, the light irradiation unit U3, the development unit U4, the heat treatment unit U5, and the like included in the substrate processing system 1 with the above configuration.
- the control device 100 also controls other units not shown in FIG. 3 at the same time.
- the configuration of the control device 100 is an example, and is not limited to the above.
- the procedure for forming the metal hard mask includes a metal-containing liquid application step (S01), a deprotection promoting step (S02), a solvent removal step (S03), a moisture absorption step (S04), and heating.
- a processing step (S05) is included. Each step is performed by the control device 100 controlling each unit constituting the coating / developing device 2.
- the metal-containing liquid application step (S01) is a step of applying a metal-containing liquid on the lower layer film on the surface of the wafer W.
- the metal-containing liquid is a liquid in which a material (metal hard mask material) of a metal-containing hard mask (metal hard mask) is dissolved in a solvent.
- the metal-containing liquid application step (S01) can be performed using the liquid processing unit U1 of the processing module 11.
- the deprotection accelerating step (S02) is a step of accelerating the deprotection of a functional group in the metal hard mask material contained in the metal-containing liquid. Specifically, by irradiating the applied metal-containing liquid with ultraviolet rays, deprotection of the functional group in the metal hard mask material is promoted.
- the step of promoting deprotection by irradiating the metal-containing liquid with ultraviolet rays (S02) can be performed using the light irradiation unit U3 of the processing module 11.
- the irradiation amount of the ultraviolet ray to the metal-containing liquid is not particularly limited as long as the deprotection of the functional group in the metal hard mask material is promoted.
- the metal-containing liquid by irradiating the metal-containing liquid with light of about 180 mJ / cm 2 to 800 mJ / cm 2 , deprotection of a functional group in the metal hard mask material can be promoted.
- a light source that emits ultraviolet light for example, an excimer laser using a mixed gas can be used, but the type of light source can be appropriately changed.
- the wavelength of the ultraviolet light is not particularly limited, but by setting the wavelength of the ultraviolet light to 200 nm or less, deprotection can be more appropriately promoted.
- the wavelength of the ultraviolet light for example, light having a wavelength of 172 nm, 193 nm, or the like can be used, but is not limited thereto.
- the environment in which the deprotection promoting step (S02) is performed is not particularly limited, but a configuration in which the periphery of the wafer W is a low oxygen atmosphere can be adopted.
- a low oxygen atmosphere refers to an atmosphere in which the proportion of oxygen is 300 ppm or less.
- the deprotection promoting step (S02) may be performed in a low oxygen atmosphere, for example, in a nitrogen atmosphere.
- the solvent removal step (S03) is a step of removing the solvent contained in the metal-containing liquid by drying. Specifically, by performing a predetermined heat treatment on the wafer W to which the metal-containing liquid has been applied, removal of the solvent is promoted. In the solvent removing step (S03), for example, by heating at a heating temperature of 100 ° C. to 170 ° C. for about 30 seconds to 90 seconds, removal of the solvent from the surface of the wafer W is promoted. As an example, in the solvent removing step (S03), the wafer W is heated under the conditions of a heating temperature of 130 ° C. and a heating time of 60 seconds.
- the heating temperature in the solvent removal step (S03) a temperature higher than the volatilization temperature of the solvent contained in the metal-containing liquid is set.
- the heating time is set to such an extent that the surface of the metal-containing liquid is maintained at a temperature higher than the volatilization temperature of the solvent by heating for a predetermined time.
- the solvent removal step (S03) can be performed using the heat treatment unit U2 of the processing module 11.
- a configuration may be adopted in which a gas flow of a predetermined atmosphere is provided around the wafer W instead of performing a predetermined heat treatment to promote the removal of the solvent. Even when a gas flow of a predetermined atmosphere is provided around the wafer W, the removal of the solvent can be promoted as in the case of performing the heat treatment.
- the moisture absorption step (S04) is a step in which moisture is brought into contact with the metal hard mask material contained in the metal-containing liquid on the surface of the wafer W to promote hydrolysis of the metal hard mask material.
- the procedure is not particularly limited as long as the metal hard mask material on the surface of the wafer W can come into contact with moisture.
- the moisture absorption step (S04) may be performed by spraying water vapor on the wafer W, or the moisture absorption step (S04) may be performed by, for example, spraying water directly on the surface of the wafer W. Note that the moisture absorption step (S04) may be performed after the solvent removal step (S03).
- the moisture absorption step (S04) is performed, whereby the contact between the metal hard mask material and moisture can be promoted, and the moisture absorption efficiency can be improved. Can be increased.
- the moisture absorption step (S04) can be performed using a mechanism for flushing the rinsing liquid in the developing unit U4 of the processing module 14.
- the heat treatment step (S05) is a step of curing the metal hard mask material contained in the metal-containing liquid to form a metal hard mask on the wafer W. Through this step, a metal hard mask as an intermediate film is formed. The heating temperature and the heating time used in forming the metal hard mask are applied to the heating temperature and the heating time in the heat treatment step (S05). In the heat treatment step (S05), for example, a metal hard mask on the surface of the wafer W is formed by heating at a heating temperature of 200 ° C. to 300 ° C. for about 30 seconds to 90 seconds.
- the heat treatment step (S05) can be performed using the heat treatment unit U2 of the treatment module 11.
- a metal hard mask as an intermediate film is formed on the wafer W by the above procedure. After the formation of the metal hard mask, a resist film is formed immediately above.
- the deprotection promotion step, the solvent removal step, and the moisture absorption step are performed before the heat treatment step, so that the thickness of the metal hard mask is increased. And the uniformity of film quality can be improved.
- each of the above steps promotes the progress of the reaction of the metal hard mask material at the stage of forming the metal hard mask.
- a metal hard mask forms a film by reducing hydrolysis and dehydration condensation of a metal hard mask material.
- the solvent removal step and the moisture absorption step are presumed to reduce the solvent around the metal hard mask material and increase the contact with moisture, thereby promoting the hydrolysis particularly near the film surface. Is done.
- the deprotection promoting step is presumed to promote dehydration condensation. As described above, by performing the deprotection promoting step, the solvent removing step, and the moisture absorbing step before the heat treatment step of forming the metal hard mask, the reaction relating to the formation of the metal hard mask is promoted. It is presumed.
- the deprotection promoting step performed before the heat treatment step of forming the metal hard mask causes the dehydration condensation reaction in the entire film forming the metal hard mask to proceed.
- the dehydration condensation of the metal hard mask material in the film progresses uniformly (regardless of location).
- the film quality uniformity of the entire metal hard mask after the heat treatment is improved. It is considered that, by improving the uniformity of the film quality at the time of forming the metal hard mask, the unevenness of the film thickness of the metal hard mask is eliminated, and the uniformity of the film thickness is also improved. As a result, it is considered that the uniformity of the line width of the resist pattern in the resist film formed on the metal hard mask is also improved.
- the moisture absorption step may be performed after the deprotection promotion step and the solvent removal step.
- the heat treatment step is performed immediately after the moisture absorption step, the heat treatment step can be performed before the moisture around the metal hard mask material is dried.
- a metal hard mask can be formed. Note that the above operation is more effectively achieved by adopting a configuration in which the process is promptly shifted from the moisture absorption process to the heat treatment process.
- the solvent removal step and the moisture absorption step may be performed continuously in this order.
- the contact between the metal hard mask material and moisture can be increased, so that the reaction of the metal hard mask material can be promoted.
- the interval between the solvent removing step and the heat treatment step can be shortened.
- the temperature applied in the solvent removal step and the heat treatment step may greatly change.
- a change in temperature of the metal hard mask material may affect the film quality.
- the deprotection promoting step can be performed in a low oxygen atmosphere.
- the effect of oxygen can be reduced as compared with, for example, performing the deprotection promoting step in an atmosphere containing a large amount of oxygen.
- it is necessary to prevent the reaction of oxygen and ultraviolet rays to generate ozone and the like, and to prevent ozone from affecting the deprotection of the functional groups. Can be.
- FIG. 5 shows a case where the metal-containing liquid application step (S01), the deprotection promoting step (S02), the solvent removal step (S03), the moisture absorption step (S04), and the heat treatment step (S05) are performed in this order. explained. However, in the formation procedure of the metal hard mask, the order of the deprotection promoting step, the solvent removing step, and the moisture absorbing step can be appropriately changed. If possible, some of these steps may be performed simultaneously.
- the deprotection promoting step and the solvent removing step can be performed simultaneously. Also, as shown in FIG. 6, the order of the deprotection promoting step and the solvent removing step is changed, and the metal-containing liquid applying step (S01), the solvent removing step (S03), the deprotecting promoting step (S02), the moisture absorbing step (S04) and the heat treatment step (S05) may be performed in this order.
- the deprotection promotion step is performed after the solvent is removed to some extent from the metal-containing liquid.
- the deprotection promoting step can be performed in a state where the proportion of the solvent in the metal-containing liquid applied on the wafer W is reduced.
- the possibility that the solvent adheres to the unit (light irradiation unit U3) that performs the deprotection promotion step can be reduced, and the frequency of maintenance can be suppressed.
- the order of the solvent removing step (S03) and the moisture absorbing step (S04) may be changed. Also, the conditions (parameters) and the like for performing each step can be appropriately changed.
- the substrate processing method described in the above embodiment can be implemented using the above-described coating / developing apparatus 2.
- the procedure of forming a metal hard mask using a plurality of processing modules has been described.
- the configuration may be such that each step is performed by the same processing module by changing the configuration of the processing module. .
- FIG. 7 shows an example of a processing module capable of performing a deprotection promoting step (S02), a solvent removing step (S03), and a moisture absorbing step (S04) in a substrate processing apparatus according to a modification.
- the processing module 20 shown in FIG. 7 a case will be described in which the deprotection promoting step (S02) is performed by irradiating the wafer W with ultraviolet rays, and the solvent removing step (S03) is performed by drying the substrate.
- the processing module 20 can be divided into two processing chambers 21 and 22.
- the processing chamber 21 is a processing chamber provided with a heating mechanism 30 that also functions as a heat processing unit.
- the heating mechanism 30 includes a support table 31, a hot plate 32, a chamber (cover) 33, and support pins 34. Further, the heating mechanism 30 has a ring shutter 35 so as to connect the support table 31 and the chamber 33 and seal the inside.
- a heat plate 32 serving as a heat source is accommodated on the support table 31, and the heat received by the wafer W from the heat plate 32 is controlled by using the support pins 34 to separate and support the wafer W from the heat plate 32. can do. Therefore, the heating mechanism 30 of the processing chamber 21 can control the heating temperature for the wafer W to both the heating temperature in the solvent removing step and the heating temperature in the heat treatment step.
- a bubbler 37 that generates water vapor is connected to the chamber 33 of the heating mechanism 30 via a pipe 36. Since the water vapor from the bubbler 37 can be supplied into the chamber 33 of the heating mechanism 30 via the pipe 36, when the wafer W is disposed on the hot plate 32, the water vapor can contact the surface of the wafer W. Therefore, the moisture absorption step can be performed in the heating mechanism 30. As described above, by using the heating mechanism 30 provided in the processing chamber 21 of the processing module 20, the solvent removing step and the moisture absorbing step can be performed, and the heat processing step can also be performed. Note that a thermocouple or the like may be provided in the heating mechanism 30, and the heating mechanism 30 may be controlled using temperature information or the like detected by the thermocouple.
- the processing chamber 22 is separated from the processing chamber 21 by a shutter 41 that can be opened and closed.
- a light source 42 that emits ultraviolet light is provided inside.
- a gas pipe 43 for supplying a gas into the processing chamber 22 separated by the shutter 41 is connected, so that the inside of the processing chamber 22 can be brought into a predetermined type of atmosphere.
- the wafer W can be cooled and moved using the arm 44 provided in the processing chamber 22.
- the deprotection promoting step can be performed using the light source 42 provided in the processing chamber 22 of the processing module 20.
- a series of processing after the metal-containing liquid applying step can be performed only by moving the wafer W between the processing chambers 21 and 22.
- the wafer W is irradiated with ultraviolet rays in the processing chamber 22 to remove the wafer.
- the protection promotion step (S02) is performed.
- the wafer W is moved to the processing chamber 21, and the solvent removing step (S03) using the heating by the hot plate 32 and the moisture absorbing step (S04) using the supply of water vapor from the bubbler 37 are continuously performed. be able to. Further, by changing the heating temperature of the hot plate 32, the heat treatment step (S05) can be performed.
- a series of steps related to the formation of the metal hard mask can be performed using the same processing module.
- the movement of the wafer W between the processing modules can be reduced, so that the working efficiency is improved.
- the same heating mechanism 30 as the solvent removing unit and the heat treatment unit, a series of steps for forming a metal hard mask can be performed while preventing the addition of a processing module or a heat treatment unit.
- the solvent removal unit, the moisture absorption unit, and the heat treatment unit are provided in the same processing chamber, so that the solvent atmosphere, moisture, and the like generated at the time of the operation performed by each unit are different. It is possible to prevent scattering in other parts of the processing chamber.
- the configuration of the processing module 20 described above is an example, and the configuration of the processing module can be changed as appropriate. Further, the combination of the processing modules for performing the series of steps related to the formation of the metal hard mask described in the above embodiment can be appropriately changed.
- the film formed using the metal-containing liquid only needs to be provided below the resist film, and between the film formed using the metal-containing liquid and the resist film, the above two types of films are used. May be provided with another different layer.
- Comparative Example 1 The substrate according to Comparative Example 1 was formed by the following procedure using the substrate processing system 1 according to the above embodiment. First, after a metal-containing liquid containing a metal hard mask material is applied onto the wafer W, heating is performed at a heating temperature of 250 ° C. for 60 seconds to form a metal hard mask (a heat treatment process). (Before forming a resist film). Thereafter, a resist film was formed on the surface, exposure and development were performed, and a substrate according to Comparative Example 1 having a predetermined resist pattern was prepared.
- Comparative Example 2 As in Comparative Example 1, first, a metal-containing liquid containing a metal hard mask material was applied onto the wafer W, and then heated at 130 ° C. for 60 seconds to remove the solvent (solvent removing step). Next, water was allowed to flow on the surface for 15 seconds to bring the surface into contact with water (a moisture absorption step). Thereafter, heating was performed at a heating temperature of 250 ° C. for 60 seconds to form a metal hard mask (a heat treatment step), thereby obtaining a substrate according to Comparative Example 2 (before forming a resist film). Thereafter, a resist film was formed on the surface, exposure and development were performed, and a substrate according to Comparative Example 2 having a predetermined resist pattern was prepared.
- Comparative Example 3 As in Comparative Example 1, first, a metal-containing liquid containing a metal hard mask material is applied onto a wafer W, and then, under a nitrogen atmosphere, a surface is irradiated with an excimer laser light source having a wavelength of 172 nm and an output of 800 mJ. Ultraviolet irradiation was performed (deprotection promoting step). Thereafter, heating was performed at a heating temperature of 250 ° C. for 60 seconds to form a metal hard mask (a heat treatment step), thereby obtaining a substrate according to Comparative Example 3 (before forming a resist film). Thereafter, a resist film was formed on the surface, exposure and development were performed, and a substrate according to Comparative Example 3 having a predetermined resist pattern was prepared.
- Example 1 As in Comparative Example 1, first, a metal-containing liquid containing a metal hard mask material was applied onto the wafer W, and then heated at 130 ° C. for 60 seconds to remove the solvent (solvent removing step). Next, water was allowed to flow on the surface for 15 seconds to bring the surface into contact with water (a moisture absorption step). Next, under a nitrogen atmosphere, the substrate surface was irradiated with ultraviolet rays using an excimer laser light source having a wavelength of 172 nm and an output of 800 mJ (deprotection promoting step). Thereafter, heating was performed at a heating temperature of 250 ° C.
- Example 1 a substrate according to Example 1 (before forming a resist film). Thereafter, a resist film was formed on the surface, exposure and development were performed, and a substrate according to Example 1 having a predetermined resist pattern was prepared.
- FIG. 8 shows the measurement result and its variation (FTU: 3 ⁇ ).
- FIG. 8A shows the result according to Comparative Example 1
- FIG. 8B shows the result according to Comparative Example 2
- FIG. 8C shows the result according to Comparative Example 3, and
- FIG. 9 shows the measurement result and its variation (CDU: 3 ⁇ ).
- 9 (A) shows the result according to Comparative Example 1
- FIG. 9 (B) shows the result according to Comparative Example 2
- FIG. 9 (C) shows the result according to Comparative Example 3, and
- FIG. 9 (D) Is the result according to the first embodiment.
- Example 1 From the results of evaluation results -3 and 4, in Example 1, the refractive index and its variation are smaller and the contact angle is larger than in Comparative Example 1. From this, it is presumed that the reaction was promoted in Example 1 as compared with Comparative Example 1.
- substrate processing system # 1: substrate processing system, 2: coating / developing device (substrate processing device), 11 to 14, 20: processing module, 30: heating mechanism, 100: control device, W: wafer (substrate).
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Abstract
Description
基板処理システム1は、基板に対し、感光性被膜の形成、当該感光性被膜の露光、および当該感光性被膜の現像を施すシステムである。処理対象の基板は、例えば半導体のウエハWである。感光性被膜は、例えばレジスト膜である。基板処理システム1は、塗布・現像装置2と露光装置3とを備える。露光装置3は、ウエハW(基板)上に形成されたレジスト膜(感光性被膜)の露光処理を行う。具体的には、液浸露光等の方法によりレジスト膜の露光対象部分にエネルギー線を照射する。塗布・現像装置2は、露光装置3による露光処理の前に、ウエハW(基板)の表面にレジスト膜を形成する処理を行い、露光処理後にレジスト膜の現像処理を行う。
以下、基板処理装置の一例として、塗布・現像装置2の構成を説明する。図1および図2に示すように、塗布・現像装置2は、キャリアブロック4と、処理ブロック5と、インタフェースブロック6と、制御装置100とを備える。
制御装置100は、図3に示されるように、機能モジュールとして、読取部M1と、記憶部M2と、処理部M3と、指示部M4とを有する。これらの機能モジュールは、制御装置100の機能を便宜上複数のモジュールに区切ったものに過ぎず、制御装置100を構成するハードウェアがこのようなモジュールに分かれていることを必ずしも意味するものではない。各機能モジュールは、プログラムの実行により実現されるものに限られず、専用の電気回路(例えば論理回路)、又は、これを集積した集積回路(ASIC:Application Specific Integrated Circuit)により実現されるものであってもよい。
続いて、基板処理方法の一例として、塗布・現像装置2によるレジスト膜直下の中間膜であるメタルハードマスクの形成手順を説明する。メタルハードマスクの形成に係る手順は、図5に示すように、金属含有液塗布工程(S01)、脱保護促進工程(S02)、溶剤除去工程(S03)、吸湿工程(S04)、および、加熱処理工程(S05)を含む。各工程は、制御装置100が塗布・現像装置2を構成する各ユニットを制御することにより実施される。
上記実施形態で説明した基板処理方法および基板処理装置では、金属含有液を硬化させてメタルハードマスクを形成する加熱処理工程よりも前に、脱保護促進工程と、溶剤除去工程と、吸湿工程と、が行われる。上記の各工程を有することで、メタルハードマスクの膜厚および膜質の均一性を向上させることができ、基板におけるレジストパターンの線幅の均一性を向上させることができる。
今回開示された実施形態および変形例はすべての点で例示であって制限的なものではないと考えられるべきである。上記の実施形態は、添付の請求の範囲およびその主旨を逸脱することなく、様々な形態で省略、置換、変更されてもよい。
上記の実施形態に係る基板処理システム1を用いて、以下の手順で比較例1に係る基板を形成した。まずウエハW上にメタルハードマスク材料を含む金属含有液を塗布した後、加熱温度250℃として、60秒間加熱を行い、メタルハードマスクを形成して(加熱処理工程)、比較例1に係る基板(レジスト膜形成前)を得た。その後、表面にレジスト膜を形成して、露光・現像を行ない、所定のレジストパターンを有する比較例1に係る基板を作成した。
比較例1と同様に、まずウエハW上にメタルハードマスク材料を含む金属含有液を塗布した後、加熱温度130℃として、60秒間加熱を行い、溶剤を除去した(溶剤除去工程)。次に、表面に対して水を15秒間流して、表面と水とを接触させた(吸湿工程)。その後、加熱温度250℃として、60秒間加熱を行い、メタルハードマスクを形成して(加熱処理工程)、比較例2に係る基板(レジスト膜形成前)を得た。その後、表面にレジスト膜を形成して、露光・現像を行ない、所定のレジストパターンを有する比較例2に係る基板を作成した。
比較例1と同様に、まずウエハW上にメタルハードマスク材料を含む金属含有液を塗布した後、窒素雰囲気下において、波長:172nm、出力:800mJのエキシマレーザー光源を用いて、表面に対して紫外線を照射した(脱保護促進工程)。その後、加熱温度250℃として、60秒間加熱を行い、メタルハードマスクを形成して(加熱処理工程)、比較例3に係る基板(レジスト膜形成前)を得た。その後、表面にレジスト膜を形成して、露光・現像を行ない、所定のレジストパターンを有する比較例3に係る基板を作成した。
比較例1と同様に、まずウエハW上にメタルハードマスク材料を含む金属含有液を塗布した後、加熱温度130℃として、60秒間加熱を行い、溶剤を除去した(溶剤除去工程)。次に、表面に対して水を15秒間流して、表面と水とを接触させた(吸湿工程)。次に、窒素雰囲気下において、波長:172nm、出力:800mJのエキシマレーザー光源を用いて、基板表面に対して紫外線を照射した(脱保護促進工程)。その後、加熱温度250℃として、60秒間加熱を行い、メタルハードマスクを形成して(加熱処理工程)、実施例1に係る基板(レジスト膜形成前)を得た。その後、表面にレジスト膜を形成して、露光・現像を行ない、所定のレジストパターンを有する実施例1に係る基板を作成した。
比較例1~3および実施例1に係る基板(レジスト膜形成前)におけるメタルハードマスクの膜厚の均一性を評価した。各基板におけるメタルハードマスクの膜厚を分光エリプソメトリを用いて計測した。計測結果およびそのばらつき(FTU:3σ)を図8に示す。図8(A)が比較例1に係る結果であり、図8(B)が比較例2に係る結果であり、図8(C)が比較例3に係る結果であり、図8(D)が実施例1に係る結果である。
比較例1~3および実施例1に係る基板におけるレジストパターンのホール径(CDに対応)の均一性を評価した。各基板におけるレジストパターンをCD-SEM(Critical Dimension-Scanning Electron Microscope)で計測した。計測結果およびそのばらつき(CDU:3σ)を図9に示す。図9(A)が比較例1に係る結果であり、図9(B)が比較例2に係る結果であり、図9(C)が比較例3に係る結果であり、図9(D)が実施例1に係る結果である。
比較例1および実施例1に係る基板(レジスト膜形成前)におけるメタルハードマスクの波長193nmの光に対する屈折率を計測した。計測結果の平均およびばらつき(3σ)を表1に示す。
比較例1および実施例1係る基板(レジスト膜形成前)表面での接触角を計測した。計測結果を表1に示す。比較例1と比較して実施例1において接触角が大きくなっていることから、メタルハードマスクの表面におけるOH基が減少していることが推測される。
Claims (9)
- レジストより下方の膜用の金属含有液が塗布された基板に対する基板処理方法であって、
前記金属含有液が塗布された前記基板に対する加熱処理を行う加熱処理工程の前に、
前記金属含有液が塗布された前記基板に含まれる前記膜用の材料における官能基の脱保護を促進する脱保護促進工程と、
前記基板の前記金属含有液に含まれる溶剤を除去する溶剤除去工程と、
前記基板の表面と水分とを接触させる吸湿工程と、
を有する、基板処理方法。 - 前記脱保護促進工程は、前記基板に対して紫外線を照射する工程であって、
前記溶剤除去工程は、前記基板を乾燥する工程である、請求項1に記載の基板処理方法。 - 前記吸湿工程は、前記溶剤除去工程よりも後に行われる、請求項1に記載の基板処理方法。
- 前記吸湿工程は、前記脱保護促進工程および前記溶剤除去工程よりも後に行われる、請求項1に記載の基板処理方法。
- 前記溶剤除去工程は、前記脱保護促進工程よりも後に行われる、請求項1に記載の基板処理方法。
- 前記脱保護促進工程は、前記溶剤除去工程よりも後に行われる、請求項1に記載の基板処理方法。
- 前記脱保護促進工程を低酸素雰囲気下で行う、請求項1に記載の基板処理方法。
- レジストより下方の膜用の金属含有液を基板に塗布する液処理部と、
前記金属含有液が塗布された前記基板に含まれる前記膜用の材料における官能基の脱保護を促進する脱保護促進部と、
前記基板の前記金属含有液に含まれる溶剤を除去する溶剤除去部と、
前記金属含有液が塗布された前記基板の表面と水分とを接触させる吸湿処理部と、
前記脱保護促進部、前記溶剤除去部、および、前記吸湿処理部による処理後の前記基板に対して加熱処理を行う加熱処理部と、
を有する、基板処理装置。 - 前記脱保護促進部、前記溶剤除去部、前記吸湿処理部、および前記加熱処理部が同一の処理モジュールにより構成され、
前記処理モジュール内において、
前記溶剤除去部、前記吸湿処理部、および前記加熱処理部が、同一の処理室内に設けられ、
前記溶剤除去部および前記加熱処理部として同一の加熱機構が用いられる、請求項8に記載の基板処理装置。
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| WO2023276723A1 (ja) * | 2021-06-30 | 2023-01-05 | 東京エレクトロン株式会社 | 基板処理装置及び基板処理方法 |
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| CN112584938A (zh) | 2021-03-30 |
| TW202016655A (zh) | 2020-05-01 |
| TWI820189B (zh) | 2023-11-01 |
| KR102750860B1 (ko) | 2025-01-09 |
| JPWO2020045302A1 (ja) | 2021-08-26 |
| JP7045468B2 (ja) | 2022-03-31 |
| US11594424B2 (en) | 2023-02-28 |
| US20210249277A1 (en) | 2021-08-12 |
| KR20210052498A (ko) | 2021-05-10 |
| CN112584938B (zh) | 2022-12-06 |
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