WO2016093087A1 - パターン形成方法、ガスクラスターイオンビーム照射装置及びパターン形成装置 - Google Patents
パターン形成方法、ガスクラスターイオンビーム照射装置及びパターン形成装置 Download PDFInfo
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- H10P50/00—Etching of wafers, substrates or parts of devices
- H10P50/69—Etching of wafers, substrates or parts of devices using masks for semiconductor materials
- H10P50/691—Etching of wafers, substrates or parts of devices using masks for semiconductor materials for Group V materials or Group III-V materials
- H10P50/693—Etching of wafers, substrates or parts of devices using masks for semiconductor materials for Group V materials or Group III-V materials characterised by their size, orientation, disposition, behaviour or shape, in horizontal or vertical plane
- H10P50/695—Etching of wafers, substrates or parts of devices using masks for semiconductor materials for Group V materials or Group III-V materials characterised by their size, orientation, disposition, behaviour or shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks or sidewalls or to modify the mask
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- H10P50/00—Etching of wafers, substrates or parts of devices
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- H10P50/24—Dry etching; Plasma etching; Reactive-ion etching of semiconductor materials
- H10P50/242—Dry etching; Plasma etching; Reactive-ion etching of semiconductor materials of Group IV materials
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- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/30—Electron-beam or ion-beam tubes for localised treatment of objects
- H01J37/302—Controlling tubes by external information, e.g. program control
- H01J37/3023—Program control
- H01J37/3026—Patterning strategy
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- H01J37/305—Electron-beam or ion-beam tubes for localised treatment of objects for casting, melting, evaporating, or etching
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- H01J37/30—Electron-beam or ion-beam tubes for localised treatment of objects
- H01J37/317—Electron-beam or ion-beam tubes for localised treatment of objects for changing properties of the objects or for applying thin layers thereon, e.g. for ion implantation
- H01J37/3178—Electron-beam or ion-beam tubes for localised treatment of objects for changing properties of the objects or for applying thin layers thereon, e.g. for ion implantation for applying thin layers on objects
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- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/60—Formation of materials, e.g. in the shape of layers or pillars of insulating materials
- H10P14/63—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by the formation processes
- H10P14/6326—Deposition processes
- H10P14/6328—Deposition from the gas or vapour phase
- H10P14/6334—Deposition from the gas or vapour phase using decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H10P14/6339—Deposition from the gas or vapour phase using decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition deposition by cyclic CVD, e.g. ALD, ALE or pulsed CVD
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- H10P50/00—Etching of wafers, substrates or parts of devices
- H10P50/20—Dry etching; Plasma etching; Reactive-ion etching
- H10P50/28—Dry etching; Plasma etching; Reactive-ion etching of insulating materials
- H10P50/282—Dry etching; Plasma etching; Reactive-ion etching of insulating materials of inorganic materials
- H10P50/283—Dry etching; Plasma etching; Reactive-ion etching of insulating materials of inorganic materials by chemical means
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- H10P74/00—Testing or measuring during manufacture or treatment of wafers, substrates or devices
- H10P74/20—Testing or measuring during manufacture or treatment of wafers, substrates or devices characterised by the properties tested or measured, e.g. structural or electrical properties
- H10P74/203—Structural properties, e.g. testing or measuring thicknesses, line widths, warpage, bond strengths or physical defects
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- H10P76/00—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography
- H10P76/20—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography of masks comprising organic materials
- H10P76/204—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography of masks comprising organic materials of organic photoresist masks
- H10P76/2041—Photolithographic processes
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- H10P76/00—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography
- H10P76/40—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography of masks comprising inorganic materials
- H10P76/408—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography of masks comprising inorganic materials characterised by their sizes, orientations, dispositions, behaviours or shapes
- H10P76/4083—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography of masks comprising inorganic materials characterised by their sizes, orientations, dispositions, behaviours or shapes characterised by their behaviours during the lithography processes, e.g. soluble masks or redeposited masks
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- H10P76/00—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography
- H10P76/40—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography of masks comprising inorganic materials
- H10P76/408—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography of masks comprising inorganic materials characterised by their sizes, orientations, dispositions, behaviours or shapes
- H10P76/4085—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography of masks comprising inorganic materials characterised by their sizes, orientations, dispositions, behaviours or shapes characterised by the processes involved to create the masks
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- H—ELECTRICITY
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- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/06—Sources
- H01J2237/08—Ion sources
- H01J2237/0812—Ionized cluster beam [ICB] sources
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- H01J2237/20—Positioning, supporting, modifying or maintaining the physical state of objects being observed or treated
- H01J2237/202—Movement
Definitions
- the disclosed embodiment relates to a pattern forming method, a gas cluster ion beam irradiation apparatus used for the pattern forming method, and a pattern forming apparatus for executing the pattern forming method.
- SADPT Self Aligned Double Patterning Technology
- SAQPT Self Aligned Quadruple Patterning Technology
- RIE reactive ion etching
- the second hard mask and the first hard mask are sequentially formed on the substrate, and after the etching by the RIE method, the pattern of the first spacer film in the first double patterning is used as the mask.
- a step of etching the hard mask and forming a second spacer film on the pattern of the second hard mask at the second double patterning is performed.
- Patent Document 1 describes etching using RIE.
- the quadruple patterning according to the conventional technique includes a process of forming the second hard mask and a process of removing the second hard mask, there is a problem in that the efficiency decreases and the cost increases.
- etching is performed using RIE
- ions are incident on the substrate at various angles and the straightness of the ions is reduced. For this reason, it is difficult to uniformly etch the entire substrate surface irradiated with ions.
- the shape of the spacer film formed by etching using RIE becomes non-uniform.
- the spacer film has a tapered shape. For this reason, it is difficult to directly form the second spacer film on the pattern of the first spacer film formed by the first double patterning.
- One embodiment of the present invention has been made in view of the above, and provides a pattern forming method, a gas cluster ion beam irradiation apparatus, and a pattern forming apparatus capable of increasing the efficiency of the multiple patterning process and reducing the process cost.
- the purpose is to provide.
- a pattern forming method includes a mask pattern forming step of forming a mask pattern on a substrate, a first spacer film forming step of forming a first spacer film on the mask pattern, and a gas cluster ion beam
- a gas cluster ion beam irradiation apparatus includes a gas cluster ion beam generation unit that generates a gas cluster ion beam, a substrate on which a mask pattern and a first spacer film are sequentially formed on the irradiation surface.
- a substrate driving unit that supports and drives the gas cluster ion beam to be irradiated on the substrate; and a control unit that controls the substrate driving unit, the control unit on the irradiation surface of the substrate Control is executed so that the first spacer film is etched by irradiation with the gas cluster ion beam.
- a pattern forming apparatus includes a mask pattern forming module for forming a mask pattern on a substrate, and a first spacer film for forming a first spacer film on the mask pattern.
- a second spacer pattern formation module for forming a second spacer pattern, characterized in that it comprises a substrate etching module to etch the substrate to the second spacer pattern as a mask.
- the pattern forming method, the gas cluster ion beam irradiation apparatus, and the pattern forming apparatus according to one aspect of the embodiment have an effect of increasing the efficiency of the multiple patterning process and reducing the process cost.
- FIG. 1 is a cross-sectional view of a substrate showing respective steps of quadruple patterning according to the first embodiment.
- FIG. 2 is a cross-sectional view of the substrate for explaining the profile of the spacer film etched using the gas cluster ion beam according to the first embodiment.
- FIG. 3 is a cross-sectional view of the substrate showing each step of the quadruple patterning according to the second embodiment.
- FIG. 4 is a schematic side view showing a configuration of a gas cluster ion beam irradiation apparatus according to an embodiment.
- FIG. 5 is a schematic front view of the substrate driving unit provided in the gas cluster ion beam irradiation apparatus according to the embodiment.
- FIG. 6A is a diagram for explaining an example of a method of irradiating a substrate surface of a gas cluster ion beam according to an embodiment.
- FIG. 6B is a diagram for explaining another example of a method for irradiating a substrate surface of a gas cluster ion beam according to an embodiment.
- FIG. 7 is a schematic plan view of a pattern forming apparatus according to an embodiment.
- FIG. 8 is a cross-sectional view of a substrate showing each step of quadruple patterning according to the prior art.
- FIG. 9 is a cross-sectional view of the substrate for explaining the profile of the spacer film etched by reactive ion etching (RIE).
- RIE reactive ion etching
- FIG. 8 is a cross-sectional view of a substrate showing respective steps of quadruple patterning according to the prior art.
- the four-layer patterning process will be described as an example through the embodiment, the present invention is not limited to this, and the present embodiment can be applied to general multiple patterning including a step of further forming a spacer film on the spacer film. .
- the second hard mask layer 210 and the first hard mask layer 200 are sequentially formed on the substrate 100.
- a photoresist pattern 300 is formed on the first hard mask layer 200 (FIG. 8A).
- the first hard mask layer 200 is etched using the photoresist pattern 300 as an etching mask to form a first hard mask pattern 200a (FIG. 8B).
- a first spacer film 400 is formed on the first hard mask pattern 200a (FIG. 8C). Further, a part of the first spacer film 400 is etched using RIE or the like (FIG. 8D). Then, the first hard mask pattern 200a is removed, and a pattern 400a of the first spacer film 400 is formed on the second hard mask layer 210 (FIG. 8E). Next, the second hard mask layer 210 is etched using the pattern 400a of the first spacer film 400 as a mask to form a second hard mask pattern 210a (FIG. 8F).
- a second spacer film 500 is formed on the pattern 210a of the second hard mask ((g) in FIG. 8). Further, a part of the second spacer film 500 is etched using RIE or the like ((h) in FIG. 8). Then, the second hard mask pattern 210a is etched to form a pattern 500a of the second spacer film 500 ((i) of FIG. 8). Then, a desired pattern is formed by etching the substrate 100 using the pattern 500a of the second spacer film 500 as a mask ((j) in FIG. 8).
- the first spacer film 400 is etched using RIE. Therefore, as shown in FIG. 8D, the pattern 400a of the first spacer film 400 is formed in a tapered shape, for example, on the side wall of the pattern 200a of the first hard mask.
- FIG. 9 is a cross-sectional view of the substrate for explaining the profile of the spacer film etched using RIE.
- RIE reactive ion etching
- the process of forming the second hard mask layer 210 is further required, and the process of removing the second hard mask pattern 210a through etching is further required, which reduces the process efficiency. In addition, the cost of the process increases.
- FIG. 1 is a cross-sectional view of a substrate showing respective steps of quadruple patterning according to the first embodiment.
- the quadruple patterning according to the first embodiment will be described with reference to FIG. 1 while comparing with the quadruple patterning process according to the prior art shown in FIG.
- a hard mask layer 2 is formed on a substrate 1 made of silicon, for example, and a photoresist pattern 3 is formed on the hard mask layer 2.
- the hard mask layer 2 may be formed, for example, by depositing silicon oxide through a PE-CVD process.
- the hard mask layer 2 may be formed using a spin-on hard mask of a silicon substrate such as spin-on glass (SOG).
- SOG spin-on glass
- the width of the photoresist pattern 3 may be approximately 45 nm, for example, and the interval between the photoresist patterns 3 may be approximately 75 nm. However, the width of the photoresist pattern 3 and the interval between the patterns may be set to other values, or may be set to different values according to different patterns.
- the width of the photoresist pattern 3 is the length in a predetermined direction along the surface of the substrate 1. For example, the length along the horizontal direction in FIG.
- the hard mask layer 2 is etched using the photoresist pattern 3 as an etching mask to form a hard mask pattern 2a.
- a first spacer film 4 is formed on the mask pattern 2a of the hard mask.
- the first spacer film 4 is formed conformally along the mask pattern 2a of the hard mask.
- the thickness of the first spacer film 4 may be set to about 15 nm, and the distance between the first spacer films 4 formed on the mask pattern 2a of the adjacent hard mask may be set to about 45 nm.
- Such a first spacer film 4 can be formed using atomic layer deposition (ALD). Chemical vapor deposition (Chemical Vapor Deposition, CVD) can also be used when forming the first spacer film 4. However, when CVD is used, the thickness of the spacer film formed on the upper surface of the mask pattern tends to be thicker than the thickness of the spacer film formed on the side surface of the mask pattern, and the step coverage of the spacer film is increased. Deteriorate.
- the ratio between the thickness of the spacer film formed on the upper surface of the mask pattern and the thickness of the spacer film formed on the side surface of the mask pattern is approximately 1: A spacer film having a value close to 1 and having excellent step coverage can be formed.
- the first spacer film 4 may be a material having an etching selectivity with respect to the mask pattern 2a of the hard mask.
- the first spacer film 4 may be an oxide film made of ALD oxide.
- the first spacer film 4 is anisotropically etched using a gas cluster ion beam (GCIB).
- GCIB gas cluster ion beam
- the diameter of the gas cluster ion beam can be approximately 1 cm or less. The characteristics of etching using a gas cluster ion beam will be described later.
- Etching with the gas cluster ion beam is performed until the upper surface of the mask pattern 2a of the hard mask is exposed.
- the first spacer film 4 is uniform by a thickness of about 15 nm over the entire substrate surface on which the ion beam is incident.
- Irradiation of the gas cluster ion beam over the entire surface of the substrate 1 is performed, for example, by moving the substrate 1 while irradiating the gas cluster ion beam on the substrate 1.
- the gas cluster ion beam is irradiated from the vertical direction to the irradiation surface of the substrate 1 while the substrate 1 is supported from the vertical direction with respect to the irradiation surface of the ion beam and the substrate 1 is moved in a direction parallel to the irradiation surface.
- the gas cluster ion beam can be irradiated onto the entire surface of the substrate 1 by moving the substrate 1 upward or downward while moving the substrate 1 alternately left and right. That is, the substrate 1 may be shifted in a direction perpendicular to the one direction while being alternately moved in one direction parallel to the irradiation surface and the opposite direction.
- the pattern 4a of the first spacer film 4 having a width of about 15 nm is formed in a rectangular shape on the side surface of the mask pattern 2a of the hard mask instead of a tapered shape. be able to.
- the mask pattern 2a of the hard mask is removed through etching.
- the pattern 4 a of the first spacer film 4 having a width of 15 nm remains on the substrate 1.
- the second spacer film 5 is conformally formed on the pattern 4a of the first spacer film 4.
- the second spacer film 5 may be formed of a material different from that of the first spacer film 4 having an etching selectivity with respect to the first spacer film 4.
- the second spacer film 5 may be an ALD silicon nitride (SiN) film, for example. Similar to the formation of the first spacer film 4, the film having excellent step coverage can be formed by forming the second spacer film 5 using ALD.
- the thickness of the second spacer film 5 may be approximately 15 nm, and the distance between the adjacent second spacer films 5 may be approximately 15 nm.
- the second spacer film 5 is etched over the entire surface of the substrate 1.
- the etching of the second spacer film 5 can be performed by irradiation with a gas cluster ion beam, similarly to the first spacer film 4.
- the second spacer film 5 may be etched using RIE having a short etching time in consideration of the throughput of the process. It can be efficient.
- the pattern 4a of the first spacer film 4 is selectively etched to remove the pattern 4a of the first spacer film 4 to form a pattern 5a of the second spacer film 5. Only on the substrate 1.
- the etching of the pattern 4a of the first spacer film 4 can be performed, for example, by performing an HF (hydrogen fluoride) solution treatment on the entire surface of the substrate.
- the substrate 1 is etched using the pattern 5a of the second spacer film 5 on the substrate 1 as a mask.
- a pattern having a pattern interval of about 15 nm can be formed.
- FIG. 2 is a cross-sectional view of the substrate for explaining the profile of the spacer film etched using the gas cluster ion beam according to the first embodiment. With reference to FIG. 2, etching using a gas cluster ion beam will be described.
- the incident angle and direction of the ion beam with respect to the substrate are different, and the etching amount of the corner portion of the spacer film is increased.
- the gas cluster ion beam is excellent in straightness.
- the gas cluster ion beam is applied to the substrate from a direction substantially orthogonal to the irradiation surface of the substrate.
- the gas cluster ion beam is applied to the substrate from a direction substantially orthogonal to the irradiation surface of the substrate.
- the gas cluster ion beam is applied to the substrate from a direction substantially orthogonal to the irradiation surface of the substrate.
- the gas cluster ion beam is applied to the substrate from a direction substantially orthogonal to the irradiation surface of the substrate.
- the gas cluster ion beam is applied to the substrate from a direction substantially orthogonal to the irradiation surface of the substrate.
- the first spacer film 4 is formed over the entire surface of the substrate.
- a certain amount can be etched.
- the profile of the pattern 4a of the first spacer film 4 after etching is substantially square, and the second spacer film 5 can be directly formed on the pattern 4a of the first
- the pattern 4a of the first spacer film 4 formed by etching with a gas cluster ion beam is square, and the second spacer film 5 is conformally directly on the pattern 4a of the first spacer film 4. Because it can be formed, unlike the prior art, it is not necessary to form an additional hard mask on the substrate. Accordingly, since the steps related to the formation and etching of the additional hard mask can be omitted, the efficiency of the process can be improved, thereby greatly reducing the cost of the process.
- the spacer film formed on the hard mask at the first double patterning is etched using the gas cluster ion beam. For this reason, the pattern of the spacer film can be used as it is in the next double patterning. Therefore, the number of processes in the multiple patterning can be reduced, the process efficiency can be increased, and the cost can be reduced.
- FIGS. 3A to 3H are cross-sectional views of a substrate showing respective steps of quadruple patterning according to the second embodiment of the present invention.
- the steps shown in FIGS. 3B to 3H are the same as the steps shown in FIGS. 1C to 1I, and can be executed in the same manner as the steps shown in FIG. 1 unless otherwise specified. Therefore, in the following description, detailed description about each process of 2nd Embodiment is abbreviate
- the hard mask layer 2 is not formed on the silicon substrate 1, but the photoresist pattern 3 'is directly formed (FIG. 3A). Then, a first spacer film 4 is formed on the photoresist pattern 3 '(FIG. 3B). Then, the first spacer film 4 is anisotropically etched using a gas cluster ion beam to form a first spacer film pattern 4a (FIG. 3C).
- the subsequent steps shown in (d) to (h) of FIG. 3 are the same as the steps shown in (e) to (i) of FIG. Further, the steps shown in FIGS. 3A to 3C may be performed in the same manner as the steps shown in FIGS. 1B to 1D.
- the thickness and width of the spacer film may be set similarly.
- the photoresist pattern 3 ′ is formed directly on the silicon substrate 1 without forming the hard mask layer 2 of FIG. 1.
- the photoresist pattern 3 ′ may be damaged by the subsequent etching process, the photoresist pattern 3 ′ may be used after being reinforced to prevent the etching damage. .
- the first spacer film 4 is formed on the photoresist pattern 3 ′ using the enhanced photoresist pattern 3 ′.
- (A) and (b) in FIG. 1 can be omitted. For this reason, in the second embodiment, the number of steps can be further reduced as compared with the first embodiment described above.
- FIG. 4 is a schematic side view showing a configuration of a gas cluster ion beam irradiation apparatus according to an embodiment
- FIG. 5 is a schematic front view of a substrate driving unit included in the gas cluster ion beam irradiation apparatus according to the embodiment. is there.
- the gas cluster ion beam irradiation apparatus 10 includes a gas cluster ion beam generation unit 20, a substrate driving unit 30, and a control unit 40.
- the gas cluster ion beam generator 20 generates a gas cluster ion beam.
- the substrate drive unit 30 supports the substrate 1 and drives the substrate 1 so that the gas cluster ion beam is irradiated onto the substrate 1.
- the control unit 40 controls the substrate driving unit 30.
- the gas cluster ion beam generation unit 20 includes one or more gas supply sources, for example, a first gas supply source 21 and a second gas supply source 22.
- the first gas supply source 21 and the second gas supply source 22 are used alone or in combination with each other to produce ionized clusters.
- a high-pressure condensable gas containing one or both of the first gas composition supplied from the first gas supply source 21 and the second gas composition supplied from the second gas supply source 22 is contained in the stagnation chamber 23. And exits through a nozzle 24 into a vacuum where the pressure is substantially lower than in the stagnation chamber 23. As the high pressure condensable gas escapes from the stagnation chamber 23 into the low pressure region of the source chamber 25 and expands, the gas velocity is accelerated to the ultrasonic velocity and the gas cluster beam exits the nozzle 24.
- the gas cluster constituting the gas cluster beam is ionized by the ionizer 26 to form a gas cluster ion beam (GCIB).
- the high voltage electrode 27 extracts cluster ions from the ionizer 26 and accelerates the extracted cluster ions to a desired energy.
- the kinetic energy of the cluster ions of the gas cluster ion beam thus formed is in the range of approximately 1000 electron volts (1 keV) to several tens of keV.
- the substrate 1 to which the gas cluster ion beam is irradiated is supported by the substrate driving unit 30, and the beam is irradiated over the entire surface of the substrate 1 on which the gas cluster ion beam is irradiated (hereinafter referred to as an irradiation surface).
- the substrate drive unit 30 includes a holding unit 31, a support rod 32, a rotating shaft 33, and an elevating mechanism 34.
- the holding unit 31 holds the substrate 1 from the vertical direction (substantially horizontal to the irradiation surface in FIG. 4).
- the support rod 32 is connected to the holding portion 31 and extends in the vertical direction.
- the rotating shaft 33 is disposed at the lower end of the support rod 32.
- the elevating mechanism 34 is a vertical direction moving mechanism that supports the rotating shaft 33 and can move the rotating shaft 33 in the vertical direction.
- the support rod 32 can be configured to extend from the rotary shaft 33 in the radial direction of a circle centered on the rotary shaft 33 and to reciprocate within a predetermined angle range around the rotary shaft 33. Therefore, the substrate 1 is reciprocated while drawing an arc like a pendulum by the movement of the support rod 32, and the rotating shaft 33 can operate as a lateral movement mechanism of the substrate driving unit 30.
- the vertical direction refers to the vertical direction of the paper in FIG. 4
- the horizontal direction refers to the direction from the front of the paper to the back of FIG.
- the control unit 40 is connected to the substrate driving unit 30 and controls the substrate driving unit 30.
- the controller 40 causes the gas cluster ion beam to be formed on the substrate 1 so that the first spacer film 4 formed on the substrate 1 on which the mask pattern is formed is etched over the entire irradiation surface of the substrate by the gas cluster ion beam.
- the substrate 1 supported by the substrate driving unit 30 is controlled to move.
- the control unit 40 controls the rotary shaft 33 to move the substrate 1 alternately left and right, while controlling the elevating mechanism 34 to move the substrate 1 upward or downward, thereby irradiating the surface of the substrate 1. Control can be performed so that the gas cluster ion beam is irradiated throughout.
- the gas cluster ion beam irradiation apparatus 10 can measure the thickness of the first spacer film 4 to be etched in association with the position of the first spacer film 4 on the substrate 1. May be provided.
- the controller 40 can control the moving speed of the substrate 1 based on the thickness of the first spacer film 4 measured by the thickness measuring unit 50 and the position on the substrate 1.
- the pattern 4a of the first spacer film 4 can be easily formed in a desired shape, for example, a square.
- FIG. 5 is a schematic front view of the substrate driving unit 30 provided in the gas cluster ion beam irradiation apparatus 10 according to the embodiment.
- substrate drive part 30 is demonstrated concretely.
- the support rod 32 reciprocates around the rotation shaft 33 in the arc direction
- the substrate 1 supported by the holding portion 31 moves in the left-right direction (lateral direction in FIG. 4) and moves relative to the substrate 1. Irradiation of a gas cluster ion beam is performed.
- the gas cluster ion beam can be irradiated in the vertical direction of the substrate. Accordingly, the gas cluster ion beam can be irradiated over the entire surface of the substrate 1 by moving the substrate 1 upward or downward by the elevating mechanism 34 while repeatedly moving the substrate 1 left and right by the rotation shaft 33. it can.
- a rotation motor is included in the holding
- FIGS. 6A and 6B are diagrams for explaining an example of a method for irradiating a substrate surface of a gas cluster ion beam according to an embodiment. A method of scanning the entire surface of the substrate 1 by the substrate driving unit 30 will be specifically described with reference to FIGS. 6A and 6B.
- FIG. 6A shows a case where the cluster ion beam is irradiated from the upper side of the substrate 1 supported by the holding unit 31 so that the irradiation surface substantially coincides with the vertical direction.
- the entire irradiation surface of the substrate 1 can be uniformly irradiated with the gas cluster ion beam.
- FIG. 6B shows a case where the irradiation of the gas cluster ion beam is performed from the lower side of the substrate 1 supported by the holding unit 31 so that the irradiation surface substantially coincides with the vertical direction.
- FIG. 7 is a plan view of a pattern forming apparatus according to an embodiment of the present invention.
- the pattern forming apparatus 1000 according to the present embodiment includes a loading / unloading unit 1100, a load lock chamber 1200, a plurality of processing chambers 1300, and a substrate transport mechanism 1400.
- the loading / unloading unit 1100 loads or unloads a substrate.
- the load lock chamber 1200 serves as a buffer chamber between the loading / unloading unit 1100 and the substrate processing chamber.
- the plurality of processing chambers 1300 are provided as spaces for processing a substrate. Here, a plurality of processing chambers are collectively denoted by reference numeral 1300.
- the substrate transport mechanism 1400 unloads the substrate 1 that has been processed in the processing chamber 1300 from the processing chamber 1300 or transports the unprocessed substrate 1 into the processing chamber 1300.
- each of the processing chambers 1300 devices necessary for pattern formation on the substrate 1 are installed as modules.
- each of the processing chambers 1300 arranged on the right side of FIG. 7 includes a mask pattern forming module 1310, a first spacer film forming module 1320, a gas cluster ion beam irradiation apparatus 10, and a first spacer pattern forming module 1330. , Is arranged.
- a second spacer film forming module 1340, a second spacer film etching module 1350, a second spacer pattern forming module 1360, and a substrate etching module 1370 are provided in each of the processing chambers 1300 arranged on the left side of FIG. 7, a second spacer film forming module 1340, a second spacer film etching module 1350, a second spacer pattern forming module 1360, and a substrate etching module 1370 are provided. Be placed.
- the mask pattern forming module 1310 is a module for forming a mask pattern on a substrate.
- the first spacer film forming module 1320 is a module for forming a first spacer film on the mask pattern.
- the gas cluster ion beam irradiation apparatus 10 irradiates the substrate with a gas cluster ion beam and anisotropically etches the first spacer film.
- the first spacer pattern forming module 1330 is a module for removing the mask pattern and forming the first spacer pattern on the substrate.
- the second spacer film forming module 1340 is a module for forming a second spacer film on the first spacer pattern.
- the second spacer film etching module 1350 is a module for anisotropically etching the second spacer film.
- the second spacer pattern forming module 1360 is a module for removing the first spacer pattern and forming the second spacer pattern on the substrate.
- the substrate etching module 1370 is a module for etching a substrate using the second spacer pattern as a mask.
- each step when forming a pattern by quadruple patterning can be performed in one apparatus.
- the apparatus for performing each process is configured as a module form, and the pattern forming process is performed in one apparatus.
- each module is configured in a separate apparatus, and a separate process is performed. It is also possible to perform each step with an apparatus.
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Abstract
Description
まず、従来技術による4重パターニングの例を、図8を参照して説明する。図8は、従来技術に係る4重パターニングの各工程を示す基板の断面図である。なお、実施形態を通じて4重パターニングの処理を例として説明するが、これに限定されず、スペーサ膜の上にさらにスペーサ膜を形成する工程を含む多重パターニング全般に本実施形態を適用することができる。
図8に示す従来技術では、第1スペーサ膜400のエッチング時にRIEを用いてエッチングする。このため、図8の(d)に示すように、第1ハードマスクのパターン200aの側壁上に第1スペーサ膜400のパターン400aが、例えばテーパー状に形成される。
図1は、第1実施形態に係る4重パターニングの各工程を示す基板の断面図である。図1を参照し、図8に示す従来技術に係る4重パターニングの工程と比較しつつ、第1実施形態に係る4重パターニングについて説明する。
図2は、第1実施形態に係るガスクラスターイオンビームを用いてエッチングしたスペーサ膜のプロファイルを説明するための基板の断面図である。図2を参照して、ガスクラスターイオンビームを用いたエッチングについて説明する。
第1実施形態によれば、ガスクラスターイオンビームによるエッチングによって形成された第1スペーサ膜4のパターン4aが方形となり、第1スペーサ膜4のパターン4a上に直接第2スペーサ膜5がコンフォーマルに形成されることができるので、従来技術とは異なり、追加のハードマスクを基板上に形成する必要がなくなる。従って、追加のハードマスクの形成及びエッチングに関する工程を省略することができるので、工程の効率が向上し、それによって工程の費用を大きく節減することができる。
図3の(a)~(h)は、本発明の第2実施形態に係る4重パターニングの各工程を示す基板の断面図である。図3の(b)乃至(h)に示す工程は、図1の(c)乃至(i)に示す工程と同様であり、特記しない限り図1に示す工程と同様に実行できる。したがって、以下の説明では、第2実施形態の各工程についての詳しい説明は省略し、第1実施形態と相違する点を特に説明する。
上記のように、第2実施形態では強化されたフォトレジストのパターン3’を用いてフォトレジストのパターン3’上に第1スペーサ膜4を形成するため、ハードマスク層の形成及びエッチングに関する工程(図1の(a),(b))を省略することができる。このため、第2実施形態においては、前述した第1実施形態に比べて工程の数をさらに減らすことができる。
図4は、一実施形態に係るガスクラスターイオンビーム照射装置の構成を示す概略側面図であり、図5は、一実施形態に係るガスクラスターイオンビーム照射装置が備える基板駆動部の概略正面図である。
図7は、本発明の一実施形態に係るパターン形成装置の平面図である。本実施形態に係るパターン形成装置1000は、ローディング/アンローディング部1100と、ロードロックチャンバ1200と、複数の処理室1300と、基板搬送機構1400と、を備える。
本発明によれば、ガスクラスターイオンビームを照射して第1スペーサ膜のエッチングを行うことで、2重パターニングを2回連続実施する4重パターニングによる微細パターン形成工程において、追加のハードマスク層の形成及びエッチングに関する工程を省略することができる。これにより、全体工程の数を減らすことができるので、半導体デバイスの製造において工程効率を向上させ、工程の費用を大きく節減することができる。
2 ハードマスク層
2a ハードマスクのマスクパターン
3,3’ フォトレジストのパターン
4 第1スペーサ膜
4a 第1スペーサ膜のパターン
5 第2スペーサ膜
5a 第2スペーサ膜のパターン
10 ガスクラスターイオンビーム照射装置
20 ガスクラスターイオンビーム生成部
21 第1ガス供給源
22 第2ガス供給源
23 停滞チャンバ
24 ノズル
25 ソースチャンバ
26 イオン化装置
27 高電圧電極
30 基板駆動部
31 保持部
32 支持ロッド
33 回転軸
34 昇降機構
40 制御部
50 厚さ測定部
1000 パターン形成装置
1100 ローディング/アンローディング部
1200 ロードロックチャンバ
1300 処理室
1400 基板搬送機構
Claims (17)
- 基板上にパターンを形成するパターン形成方法であって、
前記基板上にマスクパターンを形成するマスクパターン形成ステップと、
前記マスクパターン上に第1スペーサ膜を形成する第1スペーサ膜形成ステップと、
ガスクラスターイオンビーム(GCIB)を前記基板に照射して前記第1スペーサ膜をエッチングする第1スペーサ膜エッチングステップと、
前記マスクパターンを除去して前記基板上に第1スペーサパターンを形成する第1スペーサパターン形成ステップと、
前記第1スペーサパターン上に第2スペーサ膜を形成する第2スペーサ膜形成ステップと、
前記第2スペーサ膜をエッチングする第2スペーサ膜エッチングステップと、
前記第1スペーサパターンを除去して前記基板上に第2スペーサパターンを形成する第2スペーサパターン形成ステップと、
前記第2スペーサパターンをマスクとして前記基板をエッチングする基板エッチングステップと、
を含む、パターン形成方法。 - 前記マスクパターン形成ステップは、
前記基板上に単一のハードマスク層を形成し、前記ハードマスク上にフォトレジストパターンを形成するステップと、
前記フォトレジストパターンをマスクとして前記ハードマスク層をエッチングすることで、前記マスクパターンを形成するステップと
を含むことを特徴とする請求項1に記載のパターン形成方法。 - 前記第1スペーサ膜エッチングステップは、
前記ガスクラスターイオンビームを前記基板上に照射しながら前記基板を移動させるステップを含むことを特徴とする請求項1又は2に記載のパターン形成方法。 - 前記基板は、前記ガスクラスターイオンビームの照射面が鉛直方向に延在するよう支持され、
前記ガスクラスターイオンビームは、前記基板の照射面に対して略垂直となる水平方向から照射され、
前記基板を略水平方向2方向に交互に移動させながら略鉛直方向または略鉛直方向と反対方向に移動させることで、前記基板の前記照射面全体にわたって前記ガスクラスターイオンビームが照射されるようにすることを特徴とする請求項3に記載のパターン形成方法。 - 前記第1スペーサ膜エッチングステップは、
前記基板上の位置に対応付けて前記第1スペーサ膜の厚さを測定するステップと、
前記基板上の位置および前記測定された厚さに基づいて前記基板の移動速度を制御するステップと、
をさらに含むことを特徴とする請求項3に記載のパターン形成方法。 - 前記第1スペーサ膜と前記第2スペーサ膜とは互いに異なった材料からなることを特徴とする請求項1又は2に記載のパターン形成方法。
- 前記第1スペーサ膜形成ステップは、原子層蒸着(Atomic Layer Deposition)を用いて行われることを特徴とする請求項1又は2に記載のパターン形成方法。
- 前記第2スペーサ膜エッチングステップは、反応性イオンエッチング(Reactive Ion Etching)を用いて行われることを特徴とする請求項1又は2に記載のパターン形成方法。
- 前記第2スペーサパターン形成ステップは、前記基板上にHF(フッ化水素)溶液処理を実施して行われることを特徴とする請求項1又は2に記載のパターン形成方法。
- ガスクラスターイオンビーム照射装置であって、
ガスクラスターイオンビームを生成するガスクラスターイオンビーム生成部と、
マスクパターン及び第1スペーサ膜が順次照射面に形成された基板を支持して前記基板上に前記ガスクラスターイオンビームが照射されるように駆動する基板駆動部と、
前記基板駆動部を制御する制御部と、
を含み、
前記制御部は、前記基板の照射面上に前記ガスクラスターイオンビームが照射されて、前記第1スペーサ膜がエッチングされるように制御を実行することを特徴とするガスクラスターイオンビーム照射装置。 - 前記制御部は、前記基板の照射面上に前記ガスクラスターイオンビームが照射される間、前記基板を移動させるように前記基板駆動部を制御することを特徴とする請求項10に記載のガスクラスターイオンビーム照射装置。
- 前記制御部は、前記基板を略水平方向2方向に交互に移動させながら略鉛直方向または略鉛直方向と反対方向に移動させるよう前記基板駆動部を制御することで、前記基板の照射面全体にわたって前記ガスクラスターイオンビームが照射されるように制御することを特徴とする請求項11に記載のガスクラスターイオンビーム照射装置。
- 前記基板駆動部は、
前記基板を略鉛直方向に保持する保持部と、
前記保持部と連結され、略鉛直方向に延長された支持ロッドと、
前記保持部によって保持された前記基板を略水平方向に移動可能にする横方向移動機構と、
前記保持部によって支持された前記基板を略鉛直方向および略鉛直方向の反対方向に移動可能にする縦方向移動機構と、
を含むことを特徴とする請求項11又は12に記載のガスクラスターイオンビーム照射装置。 - 前記横方向移動機構は、前記支持ロッドに連結され、前記支持ロッドを円弧方向に往復運動可能とする回転軸を含むことを特徴とする請求項13に記載のガスクラスターイオンビーム照射装置。
- 前記縦方向移動機構は、前記回転軸を支持し、前記回転軸を略鉛直方向および略鉛直方向の反対方向に移動させるよう構成される昇降機構を含むことを特徴とする請求項14に記載のガスクラスターイオンビーム照射装置。
- 前記基板上の位置に対応付けて前記第1スペーサ膜の厚さを測定する厚さ測定部をさらに含み、
前記制御部は、前記基板上の位置および前記厚さ測定部が測定した第1スペーサ膜の厚さに基づいて前記基板の移動速度を制御することを特徴とする請求項11又は12に記載のガスクラスターイオンビーム照射装置。 - 基板上にパターンを形成するパターン形成装置であって、
前記基板上にマスクパターンを形成するためのマスクパターン形成モジュールと、
前記マスクパターン上に第1スペーサ膜を形成するための第1スペーサ膜形成モジュールと、
ガスクラスターイオンビームを前記基板に照射して前記第1スペーサ膜をエッチングするためのガスクラスターイオンビーム照射装置と、
前記マスクパターンを除去して前記基板上に第1スペーサパターンを形成するための第1スペーサ膜パターン形成モジュールと、
前記第1スペーサパターン上に第2スペーサ膜を形成するための第2スペーサ膜形成モジュールと、
前記第2スペーサ膜をエッチングするための第2スペーサ膜エッチングモジュールと、
前記第1スペーサパターンを除去して前記基板上に第2スペーサパターンを形成するための第2スペーサパターン形成モジュールと、
前記第2スペーサパターンをマスクとして前記基板をエッチングする基板エッチングモジュールと
を含む、パターン形成装置。
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- 2015-11-27 WO PCT/JP2015/083436 patent/WO2016093087A1/ja not_active Ceased
- 2015-11-27 KR KR1020177015463A patent/KR20170093831A/ko not_active Withdrawn
- 2015-11-27 TW TW104139769A patent/TW201626455A/zh unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109309091A (zh) * | 2017-07-28 | 2019-02-05 | 联华电子股份有限公司 | 图案化方法 |
| US11462546B2 (en) | 2017-11-03 | 2022-10-04 | Varian Semiconductor Equipment Associates, Inc. | Dynamic random access device including two-dimensional array of fin structures |
| JP2021522689A (ja) * | 2018-05-03 | 2021-08-30 | プラズマ − サーム エヌイーエス、エルエルシー | 走査イオン・ビーム・エッチング |
| JP7097990B2 (ja) | 2018-05-03 | 2022-07-08 | プラズマ - サーム エヌイーエス、エルエルシー | 走査イオン・ビーム・エッチング |
| JP2022529153A (ja) * | 2019-04-16 | 2022-06-17 | エーエスエムエル ネザーランズ ビー.ブイ. | 液浸リソグラフィのためのイメージセンサ |
| JP7256292B2 (ja) | 2019-04-16 | 2023-04-11 | エーエスエムエル ネザーランズ ビー.ブイ. | 液浸リソグラフィのためのイメージセンサ |
| US11774868B2 (en) | 2019-04-16 | 2023-10-03 | Asml Netherlands B.V. | Image sensor for immersion lithography |
| JP2024540802A (ja) * | 2021-11-01 | 2024-11-06 | インターナショナル・ビジネス・マシーンズ・コーポレーション | ピッチラインをパターニングするための構造および方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2016093087A1 (ja) | 2017-09-07 |
| TW201626455A (zh) | 2016-07-16 |
| US20170338114A1 (en) | 2017-11-23 |
| KR20170093831A (ko) | 2017-08-16 |
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