WO2017069203A1 - 基板処理方法及びコンピュータ記憶媒体 - Google Patents
基板処理方法及びコンピュータ記憶媒体 Download PDFInfo
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- WO2017069203A1 WO2017069203A1 PCT/JP2016/081118 JP2016081118W WO2017069203A1 WO 2017069203 A1 WO2017069203 A1 WO 2017069203A1 JP 2016081118 W JP2016081118 W JP 2016081118W WO 2017069203 A1 WO2017069203 A1 WO 2017069203A1
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- block copolymer
- polymer
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- film
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- H10P76/00—
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- H10P50/287—
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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
- B05D3/10—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 other chemical means
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/16—Coating processes; Apparatus therefor
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/16—Coating processes; Apparatus therefor
- G03F7/168—Finishing the coated layer, e.g. drying, baking, soaking
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/38—Treatment before imagewise removal, e.g. prebaking
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/42—Stripping or agents therefor
- G03F7/422—Stripping or agents therefor using liquids only
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- H10P14/6336—
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- H10P72/0421—
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- H10P72/0448—
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- H10P72/0454—
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- H10P72/0458—
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- H10P72/0474—
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- H10P76/20—
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- H10P76/2043—
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- H10P95/90—
Definitions
- the present invention relates to a substrate processing method using a block copolymer comprising a hydrophilic (polar) polymer having hydrophilicity (polarity) and a hydrophobic (nonpolar) polymer having hydrophobicity (no polarity). And a computer storage medium.
- a block copolymer comprising a hydrophilic (polar) polymer having hydrophilicity (polarity) and a hydrophobic (nonpolar) polymer having hydrophobicity (no polarity).
- a resist coating process for coating a resist solution on a semiconductor wafer to form a resist film
- an exposure process for exposing a predetermined pattern on the resist film A photolithography process for sequentially performing a development process for developing the exposed resist film is performed to form a predetermined resist pattern on the wafer.
- an etching process is performed on the film to be processed on the wafer, and then a resist film removing process is performed to form a predetermined pattern on the film to be processed.
- Patent Document 1 a wafer processing method using a block copolymer composed of two types of block chains (polymer), hydrophilic and hydrophobic, has been proposed (Patent Document 1).
- a guide is formed on a wafer by using a resist pattern, for example.
- a block copolymer is applied onto the wafer, and the block copolymer is subjected to a heat treatment to cause phase separation into a hydrophilic polymer and a hydrophobic polymer.
- the wafer is irradiated with ultraviolet rays to modify the polymer, and an organic solvent is supplied onto the wafer, whereby the hydrophilic polymer is selectively removed.
- a fine pattern by the hydrophobic polymer is formed on the wafer.
- a predetermined pattern is transferred to the film to be processed using the hydrophobic polymer pattern as a mask.
- a guide formed by a resist pattern or the like has a concavo-convex shape.
- the concavo-convex pattern has a sparse part and a dense part.
- the film thickness of the polymer coating film is different. Specifically, the film thickness is thin in the dense part, and the film thickness is thick in the sparse part. Therefore, the supply amount of the coating liquid when forming the coating film is set so that the film thickness of the sparse part is about 20 nm to 30 nm.
- the hydrophilic polymer and the hydrophobic polymer may be arranged in an unintended shape in the sparse part. It has been confirmed that there is. Then, there arises a problem that the pattern of the unintended shape is transferred to the film to be processed and the film to be processed cannot be formed into a desired shape.
- the present invention has been made in view of such points, and an object of the present invention is to appropriately form a predetermined pattern on a substrate in substrate processing using a block copolymer containing a hydrophilic polymer and a hydrophobic polymer. It is said.
- one embodiment of the present invention is a substrate processing method for processing a substrate using a block copolymer including a hydrophilic polymer and a hydrophobic polymer, wherein a predetermined uneven pattern is formed.
- the film thickness reduction process is performed before the polymer separation process, By reducing the film thickness of the sparse part to a predetermined film thickness or less, it is possible to prevent the hydrophilic polymer and the hydrophobic polymer from being arranged in an unintended shape in the sparse part after the polymer separation step.
- the film thickness reduction process after the polymer separation process and reducing the film thickness of the coating film by the hydrophilic polymer and the hydrophobic polymer arranged in an unintended shape, for example, the pattern by the hydrophobic polymer is etched.
- a predetermined pattern can be appropriately formed on a substrate in substrate processing using a block copolymer including a hydrophilic polymer and a hydrophobic polymer.
- a readable computer storage medium storing a program that operates on a computer of a control unit that controls the substrate processing system so that the substrate processing method is executed by the substrate processing system. It is.
- a predetermined pattern can be appropriately formed on a substrate in substrate processing using a block copolymer containing a hydrophilic polymer and a hydrophobic polymer.
- FIG. 1 is an explanatory diagram of a plane showing an outline of a configuration of a substrate processing system 1 that performs a substrate processing method according to the present embodiment.
- elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.
- the substrate processing system 1 includes a coating processing apparatus 2 that performs liquid processing such as photolithography processing on a wafer as a substrate, and a plasma processing apparatus 3 that performs plasma processing on the wafer.
- FIG. 2 is an explanatory diagram of a plane of the coating treatment apparatus 2
- FIGS. 3 and 4 are a front view and a rear view, respectively, schematically showing an outline of the internal configuration of the substrate processing system 1.
- the coating processing apparatus 2 in the present embodiment performs liquid processing such as coating processing and development processing.
- the coating processing apparatus 2 includes a cassette station 10 in which a cassette C containing a plurality of wafers W is loaded and unloaded, and a processing station 11 having a plurality of various processing apparatuses that perform predetermined processing on the wafers W. And an interface station 13 that transfers the wafer W to and from the exposure apparatus 12 adjacent to the processing station 11 is integrally connected.
- the cassette station 10 is provided with a cassette mounting table 20.
- the cassette mounting table 20 is provided with a plurality of cassette mounting plates 21 on which the cassette C is mounted when the cassette C is carried into and out of the substrate processing system 1.
- the cassette station 10 is provided with a wafer transfer device 23 that is movable on a transfer path 22 extending in the X direction.
- the wafer transfer device 23 is also movable in the vertical direction and the vertical axis direction ( ⁇ direction), and includes a cassette C on each cassette mounting plate 21 and a delivery device for a third block G3 of the processing station 11 described later.
- the wafer W can be transferred between the two.
- the processing station 11 is provided with a plurality of, for example, four blocks G1, G2, G3, and G4 having various devices.
- the first block G1 is provided on the front side of the processing station 11 (X direction negative direction side in FIG. 2), and the second side is provided on the back side of the processing station 11 (X direction positive direction side in FIG. 2).
- Block G2 is provided.
- a third block G3 is provided on the cassette station 10 side (Y direction negative direction side in FIG. 2) of the processing station 11, and the interface station 13 side (Y direction positive direction side in FIG. 2) of the processing station 11 is provided. Is provided with a fourth block G4.
- a plurality of liquid processing devices for example, a developing device 30 for developing the wafer W, an organic solvent supply as a polymer removing device for supplying an organic solvent onto the wafer W Apparatus 31, antireflection film forming apparatus 32 for forming an antireflection film on wafer W, neutral layer forming apparatus 33 for forming a neutral layer by applying a neutral agent on wafer W, resist solution on wafer W
- a resist coating device 34 for forming a resist film by coating and a block copolymer coating device 35 for coating a block copolymer on the wafer W are stacked in order from the bottom.
- the developing device 30, the organic solvent supply device 31, the antireflection film forming device 32, the neutral layer forming device 33, the resist coating device 34, and the block copolymer coating device 35 are arranged side by side in the horizontal direction. .
- the number and arrangement of these liquid processing apparatuses can be arbitrarily selected.
- spin coating for applying a predetermined coating liquid on the wafer W is performed.
- a coating liquid is discharged onto the wafer W from a coating nozzle, and the wafer W is rotated to diffuse the coating liquid to the surface of the wafer W.
- the block copolymer applied on the wafer W by the block copolymer coating device 35 is a first polymer (a first monomer having a linear weight) in which a first monomer and a second monomer are linearly polymerized.
- a hydrophilic polymer having hydrophilicity (polarity) is used
- a hydrophobic polymer having hydrophobicity (nonpolarity) is used.
- polymethyl methacrylate PMMA
- polystyrene PS
- the molecular weight ratio of the hydrophilic polymer in the block copolymer is about 20% to 40%, and the molecular weight ratio of the hydrophobic polymer in the block copolymer is about 80% to 60%.
- the block copolymer is obtained by making a copolymer of these hydrophilic polymer and hydrophobic polymer into a solution with a solvent.
- the neutral layer formed on the wafer W by the neutral layer forming apparatus 33 has an intermediate affinity for the hydrophilic polymer and the hydrophobic polymer.
- a random copolymer or an alternating copolymer of polymethyl methacrylate and polystyrene is used as the neutral layer.
- neutral means having an intermediate affinity for the hydrophilic polymer and the hydrophobic polymer.
- a heat treatment apparatus 40 for performing heat treatment of the wafer W an ultraviolet irradiation apparatus 41 for irradiating the wafer W with ultraviolet light, an adhesion apparatus 42 for hydrophobizing the wafer W, A peripheral exposure device 43 that exposes the outer peripheral portion of the wafer W, and a polymer separation device 44 that phase-separates the block copolymer coated on the wafer W by the block copolymer coating device 35 into a hydrophilic polymer and a hydrophobic polymer Are arranged side by side in the horizontal direction.
- the number and arrangement of the heat treatment apparatus 40, the ultraviolet irradiation apparatus 41, the adhesion apparatus 42, the peripheral exposure apparatus 43, and the polymer separation apparatus 44 can be arbitrarily selected.
- the heat treatment apparatus 40 includes a hot plate for placing and heating the wafer W and a cooling plate for placing and cooling the wafer W, and can perform both heat treatment and cooling treatment.
- the polymer separation device 44 is also a device that performs heat treatment on the wafer W, and the configuration thereof is the same as that of the heat treatment device 40.
- the ultraviolet irradiation device 41 has, for example, a wavelength for the processing container 45 that hermetically accommodates the wafer W, the mounting table 46 for mounting the wafer W, and the wafer W on the mounting table 46.
- An ultraviolet irradiation unit 47 that irradiates ultraviolet rays of 172 nm and a gas supply source 48 that supplies a clean oxygen-containing gas into the processing container 45 are provided.
- the mounting table 46 incorporates a heater (not shown), and the wafer W mounted on the mounting table 46 can be heated to a predetermined temperature.
- a plurality of delivery devices 50, 51, 52, 53, 54, 55, and 56 are provided in order from the bottom.
- the fourth block G4 is provided with a plurality of delivery devices 60, 61, 62 in order from the bottom.
- a wafer transfer area D is formed in an area surrounded by the first block G1 to the fourth block G4.
- a plurality of wafer transfer devices 70 having transfer arms 70a that are movable in the Y direction, the X direction, the ⁇ direction, and the vertical direction are arranged.
- the wafer transfer device 70 moves in the wafer transfer area D and transfers the wafer W to a predetermined device in the surrounding first block G1, second block G2, third block G3, and fourth block G4. it can.
- the wafer transfer area D is provided with a shuttle transfer device 80 that transfers the wafer W linearly between the third block G3 and the fourth block G4.
- the shuttle transport device 80 is linearly movable in the Y direction, for example.
- the shuttle transfer device 80 moves in the Y direction while supporting the wafer W, and can transfer the wafer W between the transfer device 52 of the third block G3 and the transfer device 62 of the fourth block G4.
- a wafer transfer device 90 is provided next to the third block G3 on the positive side in the X direction.
- the wafer transfer device 90 includes a transfer arm 90a that can move in the X direction, the ⁇ direction, and the vertical direction, for example.
- the wafer transfer device 90 moves up and down while supporting the wafer W, and can transfer the wafer W to each delivery device in the third block G3.
- the interface station 13 is provided with a wafer transfer device 91 and a delivery device 92.
- the wafer transfer device 91 has a transfer arm 91a that is movable in the Y direction, the ⁇ direction, and the vertical direction, for example.
- the wafer transfer device 91 can transfer the wafer W between each transfer device, the transfer device 92, and the exposure device 12 in the fourth block G4 by supporting the wafer W on the transfer arm.
- the plasma processing apparatus 3 performs a plasma etching process on the wafer W, a cassette station 100 that carries the wafer W into and out of the plasma processing apparatus 3, a common transfer unit 101 that transfers the wafer W, and the like.
- Etching apparatuses 102 and 103 as polymer removing apparatuses that selectively remove either hydrophilic polymer or hydrophobic polymer, and etching apparatuses 104 and 105 that etch a film to be processed on the wafer W into a predetermined pattern.
- the cassette station 100 has a transfer chamber 111 in which a wafer transfer mechanism 110 for transferring the wafer W is provided.
- the wafer transfer mechanism 110 has two transfer arms 110a and 110b that hold the wafer W substantially horizontally, and is configured to transfer the wafer W while holding the wafer W by either of the transfer arms 110a and 110b.
- a cassette mounting table 112 on which a cassette C capable of accommodating a plurality of wafers W arranged side by side is mounted on the side of the transfer chamber 111. In the illustrated example, a plurality of, for example, three cassettes C can be mounted on the cassette mounting table 112.
- the transfer chamber 111 and the common transfer unit 101 are connected to each other via two load lock devices 113a and 113b that can be evacuated.
- the common transfer unit 101 includes a transfer chamber chamber 114 having a sealable structure formed to have a substantially polygonal shape (hexagonal shape in the illustrated example) when viewed from above, for example.
- a wafer transfer mechanism 115 that transfers the wafer W is provided in the transfer chamber 114.
- the wafer transfer mechanism 115 has two transfer arms 115a and 115b that hold the wafer W substantially horizontally, and is configured to transfer the wafer W while holding it by either of the transfer arms 115a and 115b. .
- etching devices 102 to 105 and load lock devices 113b and 113a are disposed so as to surround the periphery of the transfer chamber 114.
- the etching devices 102 to 105 and the load lock devices 113b and 113a are arranged, for example, in this order in the clockwise direction when viewed from above, and to face the six side surfaces of the transfer chamber 114, respectively. ing.
- an RIE (Reactive Ion Etching) apparatus is used as the etching apparatuses 202 to 205, for example. That is, in the etching apparatuses 202 to 205, dry etching for etching the hydrophobic polymer and the film to be processed is performed by reactive gas (etching gas), ions, and radicals.
- etching gas reactive gas
- ions ions
- radicals radicals
- the substrate processing system 1 described above is provided with a control unit 300 as shown in FIG.
- the control unit 300 is a computer, for example, and has a program storage unit (not shown).
- the program storage unit stores a program for controlling the processing of the wafer W in the substrate processing system 1.
- the program storage unit also stores a program for controlling the operation of driving systems such as the above-described various processing apparatuses and transfer apparatuses to realize wafer processing in the substrate processing system 1.
- the program is recorded on a computer-readable storage medium such as a computer-readable hard disk (HD), flexible disk (FD), compact disk (CD), magnetic optical desk (MO), or memory card. Or installed in the control unit 300 from the storage medium.
- HD computer-readable hard disk
- FD flexible disk
- CD compact disk
- MO magnetic optical desk
- FIG. 7 is a flowchart showing an example of main steps of such wafer processing.
- a cassette C storing a plurality of wafers W is carried into the cassette station 10 of the coating processing apparatus 2.
- Each wafer W in the cassette C is sequentially transferred to the heat treatment apparatus 40 of the processing station 11 and the temperature is adjusted.
- the wafer W is transferred to the antireflection film forming apparatus 32, and the antireflection film 400 is formed on the wafer W as shown in FIG. 8 (step S1 in FIG. 7).
- the film to be processed E is formed in advance on the upper surface of the wafer W in the wafer W in the present embodiment, and the antireflection film 400 is formed on the upper surface of the film to be processed E.
- the wafer W is transferred to the heat treatment apparatus 40, heated, and the temperature is adjusted.
- the wafer W is transferred to the neutral layer forming device 33 by the wafer transfer device 70.
- the neutral layer forming apparatus 33 as shown in FIG. 8, a neutral agent is applied on the antireflection film 400 of the wafer W to form a neutral layer 401 (step S2 in FIG. 7).
- the wafer W is transferred to the heat treatment apparatus 40, heated, temperature-controlled, and then returned to the delivery apparatus 53.
- the wafer W is transferred to the adhesion apparatus 42 and subjected to an adhesion process. Thereafter, the wafer W is transported to the resist coating device 34, and a resist solution is applied onto the antireflection film 400 of the wafer W to form a resist film 402 as shown in FIG. Thereafter, the wafer W is transferred to the heat treatment apparatus 40 and pre-baked. Thereafter, the wafer W is transferred to the peripheral exposure device 43 and subjected to peripheral exposure processing.
- the wafer W is transferred to the exposure apparatus 12 by the wafer transfer apparatus 91 of the interface station 13 and subjected to exposure processing. Thereafter, the wafer W is transferred to the heat treatment apparatus 40 and subjected to post-exposure baking. Thereafter, the wafer W is transferred to the developing device 30 and developed. After completion of the development, the wafer W is transferred to the heat treatment apparatus 40 and subjected to a post baking process.
- an uneven resist pattern 403 is formed by the resist film 402 on the antireflection film 400 of the wafer W (step S3 in FIG. 7).
- the resist pattern 403 formed in this embodiment has a dense first region A which is a sparse portion where unevenness is not formed and a plurality of circular hole portions 403a formed in a lattice shape. And a second region B which is a portion.
- a film lower than the neutral layer 401 is omitted for illustration.
- the wafer W is transferred to the block copolymer coating device 35, and the block copolymer 404 is coated on the resist pattern 403 (block copolymer coating step; step S4 in FIG. 7).
- the block copolymer 404 in the first region A (hereinafter referred to as “block copolymer”).
- the second region B of the block copolymer 404 (hereinafter, becomes thicker than the film thickness of the called.)" block copolymer 404B ".
- the block copolymer 404B in the second region B has a film thickness approximately the same as the height of the hole portion 403a of the resist pattern 403, and the block copolymer 404A in the first region A has an uneven shape.
- the film thickness HA of the block copolymer 404A means the film thickness of the block copolymer 404 existing above the upper surface of the convex portion of the resist pattern 403.
- the supply amount of the block copolymer 404 is set so that the film thickness HA is approximately 20 nm to 30 nm.
- the wafer W is transferred to the polymer separation device 44 and subjected to heat treatment at a predetermined temperature.
- the block copolymer 404 on the wafer W is phase-separated into a hydrophilic polymer 410 and a hydrophobic polymer 411 as shown in FIGS. 12 and 13 (polymer separation step; step S5 in FIG. 7).
- the molecular weight ratio of the hydrophilic polymer in the block copolymer 404 is 20% to 40%
- the molecular weight ratio of the hydrophobic polymer is 80% to 60%.
- the cylindrical hydrophilic polymer 410 is phase-separated at the center of the hole portion 403 a of the resist pattern 403.
- the hydrophobic polymer 411 is phase-separated into a cylindrical shape concentric with the hydrophilic polymer 410 so as to surround the outer periphery of the hydrophilic polymer 410.
- the hydrophilic polymer 410 and the hydrophobic polymer 411 are phase-separated into a desired shape.
- the block copolymer 404A is thin and the resist pattern 403 that functions as a guide during phase separation does not exist.
- the hydrophilic polymer 410 and the hydrophobic polymer 411 are phase-separated into an irregular shape.
- the wafer W is transferred to the ultraviolet irradiation device 41 and irradiated with ultraviolet rays.
- the bonding chain of the polymethyl methacrylate, which is the hydrophilic polymer 410 is cut, and the polystyrene, which is the hydrophobic polymer 411, is crosslinked (step S6 in FIG. 7).
- the wafer W is transferred to the organic solvent supply device 31.
- a polar organic solvent polar organic solvent
- IPA isopropyl alcohol
- the hydrophilic polymer 410 whose bond chain has been cut by ultraviolet irradiation is dissolved by the organic solvent, and the hydrophilic polymer 410 is selectively removed from the wafer W (polymer removal step; step S7 in FIG. 7).
- the hole pattern 420 is formed by the hydrophobic polymer 411 in the second region B.
- the hydrophilic polymer 410 is selectively removed, so that the hydrophobic polymer 411 remains in an irregular shape.
- the wafer W is transferred to the plasma processing apparatus 3, and the antireflection film 400 and the film E to be processed are etched using the hydrophobic polymer 411 as a mask, as shown in FIG. If the etching process is performed with the irregularly shaped hydrophobic polymer 411 remaining in the first region A, the irregular shape may be transferred to the antireflection film 400 and the film E to be processed. It has been confirmed by the inventors. For example, when etching an inorganic film such as the antireflection film 400 or the film E to be processed using the hydrophobic polymer 411 that is an organic film as a mask, if the etching selectivity is ensured, the region corresponding to the hydrophobic polymer 411 is usually Not etched.
- the hydrophobicity existing in the first region A is obtained by irradiating the wafer W with ultraviolet rays in an atmosphere containing oxygen gas before performing the etching process in the plasma processing apparatus 3. The film thickness of the polymer 411 is reduced, and the pattern is prevented from being transferred to the lower layer.
- the wafer W is transferred to the ultraviolet irradiation device 41 again. Then, the wafer W is mounted on the mounting table 46, and the wafer W is irradiated with ultraviolet rays while being heated at a temperature lower than the transition temperature Tg of the block copolymer, approximately 150 ° C. in the present embodiment. . At this time, for example, clean air is supplied from the gas supply source 48 as a clean oxygen-containing gas into the processing container 45.
- the wafer W is transferred to the cassette C and transferred to the plasma processing apparatus 3.
- the etching apparatus 102 the antireflection film 400 and the film E to be processed are etched using the hydrophobic polymer 411 as a mask.
- the hole pattern 420 is transferred to the film E (step S9 in FIG. 7).
- the irregular pattern is substantially removed from the hydrophobic polymer 411 in the first region A by the film thickness reduction step (step S8), the irregular pattern is transferred to the film E to be processed.
- the pattern can be transferred to the film E to be processed in a desired shape.
- the film thickness HA after being reduced by the film thickness reduction step be approximately half of the pitch between the hydrophilic polymer 410 and the hydrophobic polymer 411 after phase separation. More preferably, it is preferably about zero.
- the pitch between the hydrophilic polymer 410 and the hydrophobic polymer 411 here is, for example, when the block copolymer 404 is applied on the flat neutral layer 401 and then phase-separated into a cylindrical pattern, for example.
- the distance between adjacent hydrophilic polymers 410 is a value mainly determined by the blending ratio of the hydrophilic polymer 410 and the hydrophobic polymer 411 in the block copolymer 404.
- the hydrophobic polymer 411 and the resist pattern 403 are removed, and a predetermined pattern is formed on the wafer W. Thereafter, the wafer W is stored in the cassette C, the cassette C storing the wafer W is unloaded from the plasma processing apparatus 3, and a series of wafer processing ends.
- the film thickness reduction process for reducing the film thickness HA of the hydrophobic polymer 411 is performed. Even if an irregular pattern of the hydrophobic polymer 411 is formed in this region, it is possible to prevent the irregular pattern from being transferred to the film E to be processed during the etching process. Therefore, according to the present invention, a predetermined pattern can be appropriately formed on the wafer W in the wafer processing using the block copolymer 404 including the hydrophilic polymer 410 and the hydrophobic polymer 411.
- the block copolymer 404 is phase-separated and the hydrophilic film 410 is removed, and then the film thickness reduction process is performed.
- the timing of performing the film thickness reduction process is the content of this embodiment. It is not limited to. That is, it can be performed at an arbitrary timing as long as it is after the application of the block copolymer 404 in step S4 and before the etching process in step S9.
- a film thickness reduction step is performed to reduce the film thickness HA of the block copolymer 404A.
- the film thickness reduction step may be performed in a state after the phase separation of the block copolymer 404 and before the removal of the hydrophilic polymer 410.
- the means for reducing the film thickness is not limited to only ultraviolet irradiation with heating in an oxygen gas-containing atmosphere.
- the film thickness HA may be physically and chemically reduced.
- the film thickness HA of the block copolymer 404A by, for example, a CMP process for polishing the surface of the wafer W.
- the chemical treatment for example, an etching treatment using oxygen plasma can be considered.
- the etching process using oxygen plasma can be said to be a film thickness reduction process using active oxygen in a broad sense.
- an irregular pattern is formed on the hydrophobic polymer 411 in the first region A by reducing the film thickness HA of the block copolymer 404A to a predetermined value or less in the film thickness reduction step. It is possible to prevent the irregular pattern from being transferred to the film E to be processed during the etching process in step S9.
- the film in the treatment using both ultraviolet irradiation and heating in an oxygen gas-containing atmosphere, the film can be isotropically reduced regardless of the pattern shape, and the heating temperature is controlled. Thus, it has been confirmed that this method is most preferable because the rate of film reduction can be controlled.
- an irregular pattern is formed on the hydrophobic polymer 411 in the first region A by reducing the film thickness HA of the block copolymer 404A to a predetermined value or less by the film thickness reduction process. From the viewpoint of preventing the irregular pattern from being formed on the film E to be processed, for example, when performing the etching process of step S9 in the plasma processing apparatus 3, the hydrophobicity of the first region A is prevented. It is conceivable to mask the upper surface of the polymer 411 with, for example, a resist film 402 or the like.
- the inventors of the present invention near the boundary between the first region A and the second region B, block copolymer 404 from the first region A toward the second region B as shown in FIG. Focusing on the formation of an inclined portion K in which the film thickness of the inclined portion K gradually decreases, by removing a part of the film of the inclined portion K, the boundary region between the first region A and the second region B is formed. It was considered that the alignment margin for forming the resist film 402 as a mask could be secured. Specifically, as shown in FIG. 15, for example, the film of the inclined portion K is substantially removed by performing a film thickness reduction process by ultraviolet irradiation, and the boundary between the first region A and the second region B is obtained.
- a removal region R in which the hydrophobic polymer 411 does not exist is formed in the vicinity.
- the resist film 402 is apply
- the removed region R becomes an alignment margin, so that it is easy to form the resist film 402 only on the hydrophobic polymer 411 remaining in the first region A. It becomes.
- the film thickness HA of the block copolymer 404A is reduced in the film thickness reduction step, it is not always necessary to reduce it to half or less of the pattern pitch of the hydrophilic polymer 410 and the hydrophobic polymer 411, and the removal region R In this case, it is sufficient to reduce the exposure process to such an extent that an alignment margin can be secured.
- a film thickness reduction process for forming the removal region R for example, a plasma etching process or the like may be used in addition to the treatment using ultraviolet irradiation and heating in an oxygen atmosphere, and if the removal region R can be formed. Any means can be selected.
- the case where the resist pattern 403 is transferred to the film E to be processed on the wafer W has been described as an example.
- the wafer W is etched to form a ball-shaped pattern on the wafer W. It can also be applied to the case of transferring.
- the pattern of the block copolymer 404 is not limited to the hole pattern 420, and the present invention can be applied to a case where the pattern is separated into a line and space lamellar structure, for example.
- the hydrophilic polymer 410 is removed by the so-called wet treatment in the step S7.
- the method for removing the hydrophilic polymer 410 is not limited to the present embodiment. An etching process using plasma or the like may be used.
- the present invention is not limited to such examples. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood.
- the present invention is not limited to this example and can take various forms.
- the present invention can also be applied to a case where the substrate is another substrate such as an FPD (flat panel display) other than a wafer or a mask reticle for a photomask.
- FPD flat panel display
- the present invention is useful when a substrate is treated with a block copolymer containing, for example, a hydrophilic polymer having hydrophilicity and a hydrophobic polymer having hydrophobicity.
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Abstract
Description
本願は、2015年10月23日に日本国に出願された特願2015-208718号に基づき、優先権を主張し、その内容をここに援用する。
30 現像装置
31 有機溶剤供給装置
32 反射防止膜形成装置
33 中性層形成装置
34 レジスト塗布装置
35 塗布膜形成装置
36 レジスト除去装置
37 ブロック共重合体塗布装置
40 熱処理装置
41 紫外線照射装置
42 アドヒージョン装置
43 周辺露光装置
44 ポリマー分離装置
300 制御部
400 反射防止膜
401 中性層
402 レジスト膜
403 レジストパターン
404 ポリスチレン膜
410 ブロック共重合体
411 親水性ポリマー
412 疎水性ポリマー
W ウェハ
Claims (10)
- 親水性ポリマーと疎水性ポリマーとを含むブロック共重合体を用いて、基板を処理する基板処理方法であって、
所定の凹凸パターンが形成された基板上に前記ブロック共重合体を塗布して当該ブロック共重合体の塗布膜を形成するブロック共重合体塗布工程と、
前記ブロック共重合体を前記親水性ポリマーと前記疎水性ポリマーに相分離させるポリマー分離工程と、
前記相分離したブロック共重合体から、前記親水性ポリマーを選択的に除去するポリマー除去工程と、
前記ブロック共重合体塗布工程後であって、前記ポリマー除去工程前に、前記ブロック共重合体の塗布膜の膜厚を低減する膜厚低減工程と、を有する。 - 請求項1に記載の基板処理方法において、
膜厚低減工程では、酸素ガスを含有した雰囲気中の基板に対して紫外線を照射し、前記ブロック共重合体の塗布膜が形成された基板を活性酸素雰囲気に曝すことで、当該ブロック共重合体の塗布膜の膜厚を低減する。 - 請求項1に記載の基板処理方法において、
前記膜厚低減工程では、
酸素ガスを含有した雰囲気中の基板に対して紫外線を照射し、前記ブロック共重合体の塗布膜が形成された基板を活性酸素雰囲気に曝し、
その後、前記ブロック共重合体の塗布膜が形成された基板に対して酸素ガス含有プラズマによるプラズマ処理を行うことで、当該ブロック共重合体の塗布膜の膜厚を低減する。 - 請求項2に記載の基板処理方法において、
前記ブロック共重合体の塗布膜が形成された基板を活性酸素雰囲気に曝しながら、前記基板を所定の温度で加熱処理する。 - 請求項3に記載の基板処理方法において、
前記ブロック共重合体の塗布膜が形成された基板を活性酸素雰囲気に曝しながら、前記基板を所定の温度で加熱処理する。 - 請求項1に記載の基板処理方法において、
前記膜厚低減工程では、前記ブロック共重合体の塗布膜が形成された基板に対して酸素ガス含有プラズマによるプラズマ処理を行うことで、当該ブロック共重合体の塗布膜の膜厚を低減する。 - 請求項1に記載の基板処理方法において、
前記膜厚低減工程では、前記ブロック共重合体の塗布膜の膜厚が、前記ポリマー分離工程により相分離する前記親水性ポリマーと前記疎水性ポリマーとの間のピッチの半分以下まで低減する。 - 請求項1に記載の基板処理方法において、
前記膜厚低減工程では、前記基板上に形成された前記所定の凹凸パターンにおける凸部の上面よりも上方の前記ブロック共重合体の塗布膜が除去される。 - 請求項1に記載の基板処理方法において、
前記膜厚低減工程は、前記ポリマー分離工程後であって、前記ポリマー除去工程前に行われる。 - 親水性ポリマーと疎水性ポリマーとを含むブロック共重合体を用いて、基板を処理する基板処理方法を基板処理システムによって実行させるように、当該基板処理システムを制御する制御部のコンピュータ上で動作するプログラムを格納した読み取り可能なコンピュータ記憶媒体であって、
前記基板処理方法は、
所定の凹凸パターンが形成された基板上に前記ブロック共重合体を塗布して当該ブロック共重合体の塗布膜を形成するするブロック共重合体塗布工程と、
前記ブロック共重合体を前記親水性ポリマーと前記疎水性ポリマーに相分離させるポリマー分離工程と、
前記相分離したブロック共重合体から、前記親水性ポリマーを選択的に除去するポリマー除去工程と、
前記ブロック共重合体塗布工程後であって、前記ポリマー除去工程前に、前記ブロック共重合体の塗布膜の膜厚を低減する膜厚低減工程と、を有する。
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| US15/763,529 US10586711B2 (en) | 2015-10-23 | 2016-10-20 | Substrate processing method and computer storage medium |
| KR1020187011080A KR102657313B1 (ko) | 2015-10-23 | 2016-10-20 | 기판 처리 방법 및 컴퓨터 기억 매체 |
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| US10240250B2 (en) * | 2011-10-03 | 2019-03-26 | Asml Netherlands B.V. | Method to provide a patterned orientation template for a self-assemblable polymer |
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| JP5758846B2 (ja) * | 2012-05-23 | 2015-08-05 | 東京エレクトロン株式会社 | パターン形成方法、パターン形成装置、及びコンピュータ可読記憶媒体 |
| JP5808301B2 (ja) * | 2012-09-20 | 2015-11-10 | 東京エレクトロン株式会社 | パターン形成方法 |
| JP5919210B2 (ja) * | 2012-09-28 | 2016-05-18 | 東京エレクトロン株式会社 | 基板処理方法、プログラム、コンピュータ記憶媒体及び基板処理システム |
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| JP2014060189A (ja) * | 2012-09-14 | 2014-04-03 | Toshiba Corp | パターン形成方法及び塗布装置 |
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| WO2014139793A1 (en) * | 2013-03-15 | 2014-09-18 | Asml Netherlands B.V. | Methods for providing lithography features on a substrate by self-assembly of block copolymers |
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| US10586711B2 (en) | 2020-03-10 |
| US20180269072A1 (en) | 2018-09-20 |
| TWI723052B (zh) | 2021-04-01 |
| KR102657313B1 (ko) | 2024-04-16 |
| JP6678183B2 (ja) | 2020-04-08 |
| KR20180072695A (ko) | 2018-06-29 |
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