WO2013111420A1 - 被処理基体の処理方法 - Google Patents
被処理基体の処理方法 Download PDFInfo
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- WO2013111420A1 WO2013111420A1 PCT/JP2012/079140 JP2012079140W WO2013111420A1 WO 2013111420 A1 WO2013111420 A1 WO 2013111420A1 JP 2012079140 W JP2012079140 W JP 2012079140W WO 2013111420 A1 WO2013111420 A1 WO 2013111420A1
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000007789 gas Substances 0.000 claims abstract description 184
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 27
- 239000011737 fluorine Substances 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 24
- 238000005530 etching Methods 0.000 claims abstract description 15
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims abstract 3
- 239000000758 substrate Substances 0.000 claims description 85
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 25
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 25
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 claims description 23
- 229910021334 nickel silicide Inorganic materials 0.000 claims description 23
- 239000001257 hydrogen Substances 0.000 claims description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 150000002431 hydrogen Chemical class 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 229910052759 nickel Inorganic materials 0.000 abstract description 2
- 125000006850 spacer group Chemical group 0.000 description 27
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 20
- 238000003672 processing method Methods 0.000 description 19
- 238000009792 diffusion process Methods 0.000 description 18
- 239000004020 conductor Substances 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 7
- 229910001882 dioxygen Inorganic materials 0.000 description 7
- 238000001312 dry etching Methods 0.000 description 7
- 229910004298 SiO 2 Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 4
- 229920005591 polysilicon Polymers 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- -1 oxygen radicals Chemical class 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 150000002831 nitrogen free-radicals Chemical class 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 150000001723 carbon free-radicals Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- PEUPIGGLJVUNEU-UHFFFAOYSA-N nickel silicon Chemical compound [Si].[Ni] PEUPIGGLJVUNEU-UHFFFAOYSA-N 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/49—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
- H01L29/4916—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET the conductor material next to the insulator being a silicon layer, e.g. polysilicon doped with boron, phosphorus or nitrogen
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- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
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- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66568—Lateral single gate silicon transistors
- H01L29/66575—Lateral single gate silicon transistors where the source and drain or source and drain extensions are self-aligned to the sides of the gate
- H01L29/6659—Lateral single gate silicon transistors where the source and drain or source and drain extensions are self-aligned to the sides of the gate with both lightly doped source and drain extensions and source and drain self-aligned to the sides of the gate, e.g. lightly doped drain [LDD] MOSFET, double diffused drain [DDD] MOSFET
Definitions
- Various aspects of the present invention relate to a method for processing a substrate to be processed.
- Patent Document 1 describes a kind of substrate processing method.
- the method described in Patent Document 1 relates to a method for manufacturing a MOS transistor.
- a silicon oxide film and a polysilicon film formed on a semiconductor substrate are patterned to form a gate electrode, and (b) a gate electrode is used as a mask on the semiconductor substrate.
- Ion implantation is performed to form a low-concentration diffusion region, (c) a first sidewall spacer layer and a second sidewall spacer layer are formed in order on the sidewall of the gate electrode, and (d) using these sidewall spacer layers as a mask.
- Ions are implanted into the semiconductor substrate used to form a high concentration diffusion region, and (e) a nickel silicide layer is formed on the gate electrode and the high concentration diffusion region.
- the first sidewall spacer layer may be composed of silicon oxide and the second sidewall spacer layer may be composed of silicon nitride.
- the second sidewall spacer layer may be removed by dry etching after the nickel silicide layer is formed.
- a gas containing carbon and fluorine (CF gas) and a mixed gas containing oxygen gas are generally used.
- the nickel silicide layer includes Residue derived from Ni may be deposited on the substrate to be processed.
- a substrate to be processed in which a first layer containing nickel silicide and a second layer containing silicon nitride are exposed on the surface are contained in a processing container.
- a step of etching the second layer wherein a first processing gas containing carbon and fluorine and not oxygen is supplied into the processing container, and plasma is generated in the processing container. Including the step of generating.
- a mixed gas containing a gas containing carbon and fluorine and an oxygen gas is generally used.
- a residue containing Ni may be generated on the substrate to be processed. This residue is assumed to be generated by the mechanism described below. That is, nickel silicide is etched, and Ni is combined with carbon radicals and oxygen radicals. As a result, Ni (CO) 4 is generated.
- the processing method of the substrate to be processed according to one aspect since the first processing gas supplied into the processing container does not contain oxygen, the above-described residue containing Ni is suppressed from being generated. Is possible.
- the first process gas may further contain hydrogen. Hydrogen combines with fluorine in the first process gas and can contribute to suppressing excessive silicon etching. This hydrogen may be supplied as H 2 gas.
- a processing method of a substrate to be processed is a step of removing residues from the substrate to be etched in the etching step, and includes a second container containing nitrogen and hydrogen and not containing oxygen.
- the method may further include the step of supplying a processing gas and generating plasma in the processing container.
- a residue derived from carbon and fluorine contained in the first processing gas can be deposited on the substrate to be processed.
- generation of the residue containing Ni can be suppressed.
- the step of removing the residue containing carbon and fluorine may be performed in the same processing container without taking out the substrate to be processed from the processing container. According to this embodiment, oxygen can be prevented from entering the processing container. Therefore, it is possible to suppress the generation of a residue containing Ni.
- the second processing gas may include H 2 gas and N 2 gas. Radicals generated from H 2 gas combine with fluorine in the residue containing carbon and fluorine, and radicals generated from N 2 gas combine with carbon in the residue containing carbon and fluorine. Therefore, according to this embodiment, the residue containing carbon and fluorine can be effectively removed.
- a substrate to be processed in which a first layer containing nickel silicide and a second layer containing silicon nitride are exposed on the surface is placed in a processing container.
- a step of supplying a processing gas and generating a plasma in the processing container is provided.
- the surface of the first layer is oxidized before the second layer is etched. Therefore, the first layer is etched when the second layer is etched. Generation
- production of the residue derived from Ni contained in this layer is suppressed.
- FIG. 1 is a flowchart showing a processing method of a substrate to be processed according to an embodiment.
- a substrate to be processed W is prepared in step S1.
- the substrate to be processed W has a layer (first layer) containing nickel silicide (NiSi) and a layer (second layer) containing silicon nitride (SiN).
- the layer containing nickel silicide and the layer containing silicon nitride are exposed on the surface of the substrate W to be processed.
- FIG. 2 is a diagram showing an example of a substrate to be processed to which the processing method shown in FIG. 1 can be applied.
- FIG. 2 shows an example of a substrate to be processed generated in an intermediate process of a method for manufacturing a MOS transistor.
- a processing method for a substrate to be processed according to an embodiment will be described by taking the substrate to be processed shown in FIG. 2 as an example.
- a substrate 100 includes a substrate 100, an insulating film 102, a gate electrode 104, a low concentration diffusion region 108, a first sidewall spacer layer 110, a second sidewall spacer layer 112, a high concentration diffusion region 114, and Nickel silicide layers 116 and 118 are provided.
- the substrate 100 is, for example, a first conductivity type (one of p-type and n-type) Si substrate.
- An insulating film 102 is provided over the substrate 100, and a gate electrode 104 is provided over the insulating film 102.
- the insulating film 102 is, for example, a SiO 2 film.
- the gate electrode 104 is made of, for example, polysilicon.
- a nickel silicide layer 118 is provided on the gate electrode 104.
- a first sidewall spacer layer 110 and a second sidewall spacer layer 112 are sequentially provided on each of the pair of sidewalls of the gate electrode 104. That is, the first sidewall spacer layer 110 is provided so as to be in contact with the sidewall of the gate electrode 104, and is provided between the sidewall of the gate electrode 104 and the second sidewall spacer layer 112.
- the first sidewall spacer layer 110 is made of SiO 2
- the second sidewall spacer layer 112 is made of silicon nitride (SiN).
- the substrate 100 is provided with a low concentration diffusion region 108 below the first sidewall spacer layer 110 and the second sidewall spacer layer 112.
- the low concentration diffusion region 108 is formed from the surface of the substrate 100 to a certain depth inside the substrate 100.
- the low concentration diffusion region 108 has the second conductivity type (the other of the p-type and the n-type).
- the high concentration diffusion region 114 is provided in the substrate 100 on the side of the low concentration diffusion region 108.
- High-concentration diffusion region 114 has the second conductivity type (the other of p-type and n-type).
- the second conductivity type impurity is diffused at a higher concentration than the concentration of the second conductivity type impurity in the low concentration diffusion region 108.
- a nickel silicide layer 116 is provided on the high concentration diffusion region 114.
- step (a) a SiO 2 film and a polysilicon film are formed on the substrate 100 by, for example, a CVD (Chemical Vapor Deposition) method.
- step (b) the insulating film 102 and the gate electrode 104 are formed by patterning the SiO 2 film and the polysilicon film formed in the step (a) by photolithography and etching.
- the low-concentration diffusion region 108 is formed by diffusing ions of the second conductivity type into the substrate 100 using the gate electrode 104 as a mask.
- an SiO 2 film is formed by, for example, a CVD method so as to cover the surface of the product created in the step (c), and the SiO 2 film is etched back, whereby the first sidewall spacer is formed.
- Layer 110 is formed.
- a SiN film is formed by, for example, a CVD method so as to cover the surface of the product created in the step (d), and the SiN film is etched back, whereby the second sidewall spacer layer 112 is formed.
- the high concentration diffusion region 114 is formed by diffusing ions of the second conductivity type into the substrate 100 using the second sidewall spacer layer 112 as a mask.
- a nickel film is formed by sputtering or the like so as to cover the surface of the product created in step (f), and the nickel silicide layers 116 and 118 are formed by annealing.
- the substrate W to be processed can be obtained by removing the unreacted Ni film.
- the second sidewall spacer layer 112 containing silicon nitride is exposed on the surface, and the nickel silicide layers 116 and 118 are exposed on the surface.
- FIG. 3 is a diagram showing an example of a plasma processing apparatus that can be used in the processing method shown in FIG.
- the plasma processing apparatus 10 shown in FIG. 3 includes a processing container 12, a stage 14, a microwave generator 16, an antenna 18, and a dielectric window 20.
- the plasma processing apparatus 10 is a microwave plasma processing apparatus that generates plasma by microwaves from an antenna 18.
- the processing container 12 defines a processing space S for performing plasma processing on the substrate W to be processed.
- the processing container 12 may include a side wall 12a and a bottom 12b.
- the side wall 12a has a substantially cylindrical shape extending in the axis X direction (that is, the extending direction of the axis X).
- the bottom 12b is provided on the lower end side of the side wall 12a.
- the bottom 12b is provided with an exhaust hole 12h for exhaust.
- the upper end of the side wall 12a is open.
- the upper end opening of the side wall 12 a is closed by the dielectric window 20.
- An O-ring 21 is interposed between the dielectric window 20 and the upper end of the side wall 12a. The O-ring 21 ensures the sealing of the processing container 12 more reliably.
- the microwave generator 16 generates a microwave of 2.45 GHz, for example.
- the plasma processing apparatus 10 further includes a tuner 22, a waveguide 24, a mode converter 26, and a coaxial waveguide 28.
- the microwave generator 16 is connected to the waveguide 24 via the tuner 22.
- the waveguide 24 is, for example, a rectangular waveguide.
- the waveguide 24 is connected to a mode converter 26, and the mode converter 26 is connected to the upper end of the coaxial waveguide 28.
- the coaxial waveguide 28 extends along the axis X.
- the coaxial waveguide 28 includes an outer conductor 28a and an inner conductor 28b.
- the outer conductor 28a has a substantially cylindrical shape extending in the axis X direction.
- the inner conductor 28b is provided inside the outer conductor 28a.
- the inner conductor 28b has a substantially cylindrical shape extending along the axis X.
- the microwave generated by the microwave generator 16 is guided to the mode converter 26 via the tuner 22 and the waveguide 24.
- the mode converter 26 converts a microwave mode and supplies the microwave after the mode conversion to the coaxial waveguide 28. Microwaves from the coaxial waveguide 28 are supplied to the antenna 18.
- the antenna 18 radiates a microwave for plasma excitation based on the microwave generated by the microwave generator 16.
- the antenna 18 includes a slot plate 30, a dielectric plate 32, and a cooling jacket 34.
- the slot plate 30 is a slot plate constituting a radial line slot antenna.
- the slot plate 30 is made of a metal disc having conductivity.
- the slot plate 30 is formed with a plurality of slot pairs. Each slot pair includes two slots extending in directions intersecting or orthogonal to each other.
- the plurality of slot pairs are arranged at predetermined intervals in the radial direction with respect to the axis X, and are arranged at predetermined intervals in the circumferential direction.
- the dielectric plate 32 is provided between the slot plate 30 and the lower surface of the cooling jacket 34.
- the dielectric plate 32 is made of, for example, quartz and has a substantially disk shape.
- the surface of the cooling jacket 34 may have conductivity.
- the cooling jacket 34 cools the dielectric plate 32 and the slot plate 30.
- a coolant channel is formed in the cooling jacket 34.
- the lower end of the outer conductor 28 a is electrically connected to the upper surface of the cooling jacket 34.
- the lower end of the inner conductor 28 b is electrically connected to the slot plate 30 through a hole formed in the cooling jacket 34 and the central portion of the dielectric plate 32.
- the microwave from the coaxial waveguide 28 is propagated to the dielectric plate 32 and is introduced into the processing space S from the slot of the slot plate 30 through the dielectric window 20.
- the dielectric window 20 has a substantially disc shape and is made of, for example, quartz.
- the dielectric window 20 is provided between the processing space S and the antenna 18 and is provided immediately below the antenna 18 in the axis X direction.
- a conduit 36 passes through the inner hole of the inner conductor 28 b of the coaxial waveguide 28.
- the conduit 36 extends along the axis X and is connected to the gas supply units G1, G2, G3, and G4.
- the gas supply unit G1 supplies a gas containing carbon and fluorine to the conduit 36.
- the gas containing carbon and fluorine is, for example, CH 3 F gas, CF 4 gas, or CH 2 F 2 gas.
- the gas supply unit G1 may include a gas source G1a, a valve G1b, and a flow rate controller G1c.
- the gas source G1a is a gas source of a gas containing carbon and fluorine.
- the valve G1b switches between supply and stop of gas supply from the gas source G1a.
- the flow rate controller G1c is, for example, a mass flow controller, and adjusts the flow rate of gas from the gas source G1a.
- the gas supply unit G2 supplies H 2 gas to the conduit 36.
- the gas supply unit G2 may include a gas source G2a, a valve G2b, and a flow rate controller G2c.
- the gas source G2a is a gas source of H 2 gas.
- the valve G2b switches between supply and stop of gas supply from the gas source G2a.
- the flow rate controller G2c is, for example, a mass flow controller, and adjusts the flow rate of gas from the gas source G2a.
- the gas supply unit G3 supplies Ar gas to the conduit 36.
- the gas supply unit G3 may include a gas source G3a, a valve G3b, and a flow rate controller G3c.
- the gas source G3a is a gas source of Ar gas.
- the valve G3b switches between supply and stop of gas supply from the gas source G3a.
- the flow rate controller G3c is a mass flow controller, for example, and adjusts the flow rate of the gas from the gas source G3a.
- the gas supply unit G4 supplies N 2 gas to the conduit 36.
- the gas supply unit G4 may include a gas source G4a, a valve G4b, and a flow rate controller G4c.
- the gas source G4a is a gas source of N 2 gas.
- the valve G4b switches between supply and stop of gas supply from the gas source G4a.
- the flow rate controller G4c is a mass flow controller, for example, and adjusts the flow rate of the gas from the gas source G4a.
- the plasma processing apparatus 10 further includes an injector 41.
- the injector 41 supplies the gas from the conduit 36 to the through hole 20 h formed in the dielectric window 20.
- the gas supplied to the through hole 20 h of the dielectric window 20 is supplied to the processing space S.
- the plasma processing apparatus 10 further includes a conduit 42.
- the conduit 42 supplies gas from the periphery of the axis X to the processing space S between the stage 14 and the dielectric window 20.
- the conduit 42 extends annularly about the axis X between the dielectric window 20 and the stage 14.
- a plurality of gas supply holes 42 b are formed in the conduit 42.
- the plurality of gas supply holes 42 b are arranged in an annular shape, open toward the axis X, and supply the gas supplied to the conduit 42 toward the axis X.
- the conduit 42 is connected to the gas supply units G5, G6, G7, and G8 via the conduit 46.
- the gas supply unit G5 supplies the conduit 42 with the same kind of gas as the gas supply unit G1, that is, a gas containing carbon and fluorine.
- the gas supply unit G5 may include the same components as the gas supply unit G1, that is, a gas source G5a, a valve G5b, and a flow rate controller G5c.
- the gas supply unit G6 supplies the same type of gas as the gas supply unit G2, that is, H 2 gas, to the conduit 42.
- the gas supply unit G6 may include the same components as the gas supply unit G2, that is, a gas source G6a, a valve G6b, and a flow rate controller G6c.
- the gas supply unit G7 supplies the same type of gas as the gas supply unit G3, that is, Ar gas, to the conduit 42.
- the gas supply unit G7 may include the same components as the gas supply unit G3, that is, a gas source G7a, a valve G7b, and a flow rate controller G7c.
- the gas supply unit G8 supplies the same type of gas as the gas supply unit G4, that is, N 2 gas, to the conduit 42.
- the gas supply unit G8 may include the same components as the gas supply unit G4, that is, a gas source G8a, a valve G8b, and a flow rate controller G8c.
- the stage 14 is provided so as to face the dielectric window 20 in the axis X direction.
- the stage 14 is provided so as to sandwich the processing space S between the dielectric window 20 and the stage 14.
- a substrate W to be processed is placed on the stage 14.
- the stage 14 can include a table 14 a, an electrostatic chuck 15, and a focus ring 17.
- the base 14 a is supported by a cylindrical support portion 48.
- the cylindrical support portion 48 is made of an insulating material and extends vertically upward from the bottom portion 12b.
- a conductive cylindrical support 50 is provided on the outer periphery of the cylindrical support 48.
- the cylindrical support portion 50 extends vertically upward from the bottom portion 12 b of the processing container 12 along the outer periphery of the cylindrical support portion 48.
- An annular exhaust passage 51 is formed between the cylindrical support portion 50 and the side wall 12a.
- An annular baffle plate 52 provided with a plurality of through holes is attached to the upper part of the exhaust passage 51.
- An exhaust device 56 is connected to the lower portion of the exhaust hole 12 h via an exhaust pipe 54.
- the exhaust device 56 has a vacuum pump such as a turbo molecular pump. The exhaust device 56 can depressurize the processing space S in the processing container 12 to a desired degree of vacuum.
- the stand 14a also serves as a high-frequency electrode.
- a high frequency power source 58 for RF bias is electrically connected to the base 14 a via a matching unit 60 and a power feeding rod 62.
- the high frequency power supply 58 outputs a predetermined frequency suitable for controlling the energy of ions drawn into the substrate W to be processed, for example, high frequency power of 13.65 MHz at a predetermined power.
- the matching unit 60 accommodates a matching unit for matching between the impedance on the high-frequency power source 58 side and the impedance on the load side such as electrodes, plasma, and the processing container 12.
- This matching unit includes a blocking capacitor for generating a self-bias.
- An electrostatic chuck 15 that is a holding member for holding the substrate to be processed W is provided on the upper surface of the table 14a.
- the electrostatic chuck 15 holds the substrate W to be processed with an electrostatic attraction force.
- a focus ring 17 that surrounds the periphery of the substrate to be processed W and the periphery of the electrostatic chuck 15 in an annular shape is provided.
- the electrostatic chuck 15 includes an electrode 15d, an insulating film 15e, and an insulating film 15f.
- the electrode 15d is made of a conductive film, and is provided between the insulating film 15e and the insulating film 15f.
- a high-voltage DC power source 64 is electrically connected to the electrode 15d through a switch 66 and a covered wire 68.
- the electrostatic chuck 15 can hold the substrate to be processed W by a Coulomb force generated by a DC voltage applied from the DC power supply 64.
- An annular refrigerant chamber 14g extending in the circumferential direction is provided inside the table 14a.
- a refrigerant having a predetermined temperature for example, cooling water, is circulated and supplied to the refrigerant chamber 14g from a chiller unit (not shown) via pipes 70 and 72.
- the processing temperature of the substrate W to be processed on the electrostatic chuck 15 can be controlled by the temperature of the refrigerant.
- a heat transfer gas for example, He gas is supplied between the upper surface of the electrostatic chuck 15 and the rear surface of the substrate W to be processed via the gas supply pipe 74.
- gas is supplied along the axis X into the processing space S from the through hole 20h of the dielectric window 20 through the conduit 36 and the through hole 41h of the injector 41. Further, gas is supplied from the conduit 42 toward the axis X below the through hole 20h. Further, microwaves are introduced from the antenna 18 into the processing space S through the dielectric window 20. As a result, plasma is generated in the processing space S.
- plasma can be generated without applying a magnetic field.
- the substrate W to be processed placed on the stage 14 can be processed by the plasma of the gas supplied to the processing space S.
- step S ⁇ b> 1 shown in FIG. 1 the substrate to be processed W is placed on the stage 14, that is, on the upper surface of the electrostatic chuck 15.
- step S2 the layer containing silicon nitride, that is, the second sidewall spacer layer 112 is etched.
- the second sidewall spacer layer 112 is partially or completely removed by etching in step S2.
- step S ⁇ b> 2 a gas containing carbon and fluorine is supplied from the gas supply units G ⁇ b> 1 and G ⁇ b> 5 of the plasma processing apparatus 10 into the processing container 12, and plasma is generated in the processing container 12.
- a microwave is introduced from the antenna 18 into the processing space S through the dielectric window 20 as a plasma excitation source. Thereby, plasma is generated in the processing space S in the processing container 12.
- H 2 gas may be supplied into the processing space S from the gas supply unit G2 and G6.
- Ar gas may be supplied to processing space S from gas supply parts G3 and G7 in process S2.
- the gas supplied to the processing space in step S2 constitutes the first processing gas.
- the first processing gas supplied into the processing container 12 in step S2 does not contain oxygen. Therefore, in step S2, it is possible to suppress the generation of a residue containing Ni.
- the H 2 gas supplied in step S2 can be combined with fluorine in the first processing gas, and excessive silicon etching by fluorine can be suppressed.
- NH 3 gas may be supplied instead of H 2 gas.
- the residue is removed from the substrate to be processed W etched in step S2.
- the residue removed in step S3 is derived from carbon and fluorine contained in the first processing gas used in step S2. That is, the residue is a compound containing carbon and fluorine.
- the etched substrate W is placed on the stage 14, and a second processing gas containing nitrogen and hydrogen and not containing oxygen is supplied into the processing container 12, and the processing container Plasma is generated within 12.
- step S3 H 2 gas is supplied into the processing container 12 from the gas supply units G2 and G6, and N 2 gas is supplied into the processing container 12 from the gas supply units G4 and G8.
- step S ⁇ b> 3 microwaves are introduced from the antenna 18 into the processing space S through the dielectric window 20. Thereby, plasma is generated in the processing space S in the processing container 12.
- nitrogen radicals and hydrogen radicals are generated in the processing container 12. Nitrogen radicals are combined with carbon contained in the residue, and hydrogen radicals are combined with fluorine contained in the residue. Therefore, the residue on the to-be-processed base
- step S3 may be performed after step S2 without removing the substrate W to be processed from the processing container 12. Thereby, oxygen can be prevented from entering the processing container 12. Therefore, it is possible to more effectively suppress the generation of the residue containing Ni.
- Processing space S pressure 20 mTorr (2.666 Pa) Power from high frequency power supply 58W Power of microwave generator 16 2000W Flow rate of the second processing gas N 2 gas 200 sccm H 2 gas 200sccm
- the flow ratio of the gas from the conduit 36 to the gas from the conduit 42 100: 0 Processing time: 15 seconds
- FIG. 4 is a diagram illustrating a control unit that the plasma processing apparatus illustrated in FIG. 3 may include.
- the plasma processing apparatus 10 may further include a control unit C10.
- the plasma processing apparatus 10 may perform the above-described steps S2 and S3 under the control of the control unit C10.
- the control unit C10 may be a computer having components such as a CPU and a memory, and may give a control signal to each component of the plasma processing apparatus 10 according to a program stored in the memory.
- the control unit C10 includes the valve G1b, the flow rate controller G1c, the valve G2b, the flow rate controller G2c, the valve G3b, the flow rate controller G3c, the valve G5b, the flow rate controller G5c, and the valve G6b.
- the first processing gas can be supplied into the processing container 12 by giving control signals to the flow rate controller G6c, the valve G7b, and the flow rate controller G7c.
- the control unit C ⁇ b> 10 can supply a microwave to the processing container 12 by giving a control signal to the microwave generator 16.
- step S ⁇ b> 2 the control unit C ⁇ b> 10 gives a control signal to the high frequency power supply 58 to adjust the power from the high frequency power supply 58, and gives a control signal to the exhaust device 56 to give a degree of vacuum in the processing space S in the processing container 12. Can be adjusted.
- step S3 the control unit C10 gives control signals to the valve G2b, the flow rate controller G2c, the valve G4b, the flow rate controller G4c, the valve G6b, the flow rate controller G6c, the valve G8b, and the flow rate controller G8c,
- the second processing gas can be supplied into the processing container 12.
- the control unit C ⁇ b> 10 can supply a microwave to the processing container 12 by giving a control signal to the microwave generator 16.
- step S ⁇ b> 2 the control unit C ⁇ b> 10 gives a control signal to the high frequency power supply 58 to adjust the power from the high frequency power supply 58, and gives a control signal to the exhaust device 56 to give a degree of vacuum in the processing space S in the processing container 12. Can be adjusted.
- FIG. 5 is a flowchart showing a method for processing a substrate to be processed according to an embodiment.
- the substrate to be processed is prepared in a processing container as in step S1 of FIG.
- the substrate to be processed may be the substrate to be processed W shown in FIG.
- a plasma processing apparatus similar to the plasma processing apparatus 10 shown in FIG. 3 can be used.
- oxygen gas for example, O 2 gas is supplied as the gas supplied from the gas supply units G2 and G6 or the gas supply units G4 and G8.
- step S4 oxygen plasma is generated in the processing container to oxidize the surface of the layer containing nickel silicide, for example, the layers 116 and 118 of the substrate W to be processed.
- oxygen gas is supplied from the gas supply units G2 and G4 or the gas supply units G6 and G8 into the processing container 12, and plasma is generated in the processing container 12.
- Ar gas may be supplied to processing space S from gas supply parts G3 and G7 in process S4.
- step S5 a layer containing silicon nitride, for example, the second sidewall spacer layer 112 is etched.
- the second sidewall spacer layer 112 is partially or completely removed by etching in step S5.
- step S5 a gas containing carbon and fluorine is supplied from the gas supply units G1 and G5 of the plasma processing apparatus 10 into the processing container 12, and plasma is generated in the processing container 12. Moreover, in process S5, Ar gas may be supplied to the process space S from the gas supply parts G3 and G7.
- the surface of the layer containing nickel silicide for example, the layers 116 and 118 is oxidized before the layer containing silicon nitride, for example, the layer 112 is etched.
- the layer containing silicon nitride is etched, generation of a residue derived from Ni contained in the layer containing nickel silicide is suppressed.
- a plasma processing apparatus that can be used in the method for processing a substrate to be processed according to an embodiment is not limited to a microwave plasma processing apparatus, and may be any plasma processing apparatus such as a parallel plate type plasma processing apparatus. May be.
- DESCRIPTION OF SYMBOLS 10 Plasma processing apparatus, 12 ... Processing container, 14 ... Stage, 16 ... Microwave generator, 18 ... Antenna, 20 ... Dielectric window, 28 ... Coaxial waveguide, 30 ... Slot plate, 32 ... Dielectric plate, 34 ... Cooling jacket, 36 ... Conduit, 41 ... Injector, 42 ... Conduit, 56 ... Exhaust device, 58 ... High frequency power supply, C10 ... Control part, G1-G8 ... Gas supply part, W ... Substrate to be processed, 100 ... Substrate, DESCRIPTION OF SYMBOLS 102 ... Insulating film, 104 ... Gate electrode, 108 ... Low concentration diffusion region, 110 ... First side wall spacer layer, 112 ... Second side wall spacer layer (layer containing silicon nitride), 114 ... High concentration diffusion region, 116 118 Nickel silicide layer.
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Abstract
Description
処理空間Sの圧力 100mTorr(13.33Pa)
高周波電源58からの電力 30W
マイクロ波発生器16の電力 1800W
第1の処理ガスの流量
Arガス 1000sccm
CH3Fガス 6sccm
H2ガス 30sccm
導管36からのガスと導管42からのガスの流量比(導管36からのガスの流量:導管42からのガスの流量) 95:5
処理時間:300秒
処理空間Sの圧力 20mTorr(2.666Pa)
高周波電源58からの電力 0W
マイクロ波発生器16の電力 2000W
第2の処理ガスの流量
N2ガス 200sccm
H2ガス 200sccm
導管36からのガスと導管42からのガスの流量比(導管36からのガスの流量:導管42からのガスの流量) 100:0
処理時間:15秒
処理空間Sの圧力 20mTorr~100mTorr
高周波電源58からの電力 0~100W
マイクロ波発生器16の電力 3kW(13.56MHz)
第1の処理ガスの流量
供給ガスの流量
酸素ガス(O2ガス):350sccm、又は
酸素ガス(O2ガス):350sccm、Arガス:350sccm
処理時間:30秒
処理空間Sの圧力 100mTorr(13.33Pa)
高周波電源58からの電力 30W
マイクロ波発生器16の電力 1800W
供給ガスの流量
Arガス 1000sccm
CH3Fガス又はCH2F2ガス 6sccm
導管36からのガスと導管42からのガスの流量比(導管36からのガスの流量:導管42からのガスの流量) 95:5
Claims (7)
- 被処理基体を処理する方法であって、
ニッケルシリサイドを含む第1の層と、窒化シリコンを含む第2の層とが表面に露出した被処理基体を処理容器内において準備する工程と、
前記第2の層をエッチングする工程であって、前記処理容器内に炭素及びフッ素を含み酸素を含まない第1の処理ガスを供給し、該処理容器内においてプラズマを発生させることを含む、該工程と、
を含む方法。 - 前記第1の処理ガスは更に水素を含む、請求項1に記載の方法。
- 前記第1の処理ガスは、H2ガスを含む、請求項2に記載の方法。
- 前記エッチングする工程においてエッチングされた前記被処理基体から残留物を除去する工程であって、前記処理容器内に窒素及び水素を含み酸素を含まない第2の処理ガスを供給し、該処理容器内においてプラズマを発生させることを含む、該工程を更に含む、請求項1~3の何れか一項に記載の方法。
- 前記エッチングする工程の後、前記処理容器から前記被処理基体を取り出さずに、前記残留物を除去する工程が行われる、請求項4に記載の方法。
- 前記第2の処理ガスは、H2ガス及びN2ガスを含む、請求項4又は5に記載の方法。
- 被処理基体を処理する方法であって、
ニッケルシリサイドを含む第1の層と、窒化シリコンを含む第2の層とが表面に露出した被処理基体を処理容器内において準備する工程と、
前記処理容器内において前記第1の層の表面を酸化させる工程と、
前記第2の層をエッチングする工程であって、前記処理容器内に炭素及びフッ素を含む第1の処理ガスを供給し、該処理容器内においてプラズマを発生させることを含む、該工程と、
を含む方法。
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KR1020147018465A KR102003058B1 (ko) | 2012-01-25 | 2012-11-09 | 피처리 기체의 처리 방법 |
US14/371,584 US9728417B2 (en) | 2012-01-25 | 2012-11-09 | Method for processing base body to be processed |
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JPH11204455A (ja) * | 1998-01-13 | 1999-07-30 | Sony Corp | 半導体装置の製造方法 |
JP2006253222A (ja) * | 2005-03-08 | 2006-09-21 | Tokyo Electron Ltd | エッチング方法及びエッチング装置 |
JP2006261216A (ja) * | 2005-03-15 | 2006-09-28 | Matsushita Electric Ind Co Ltd | 半導体装置の形成方法 |
JP2008124407A (ja) * | 2006-11-16 | 2008-05-29 | Sony Corp | 半導体装置の製造方法および半導体装置 |
JP2010171327A (ja) * | 2009-01-26 | 2010-08-05 | Toshiba Corp | 半導体装置の製造方法 |
JP2011018719A (ja) * | 2009-07-08 | 2011-01-27 | Fujitsu Semiconductor Ltd | 半導体装置の製造方法 |
Also Published As
Publication number | Publication date |
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KR102003058B1 (ko) | 2019-07-24 |
JP5520974B2 (ja) | 2014-06-11 |
US9728417B2 (en) | 2017-08-08 |
CN104054163A (zh) | 2014-09-17 |
CN104054163B (zh) | 2016-08-17 |
JP2013153075A (ja) | 2013-08-08 |
TW201349338A (zh) | 2013-12-01 |
KR20140119011A (ko) | 2014-10-08 |
US20150017811A1 (en) | 2015-01-15 |
TWI597774B (zh) | 2017-09-01 |
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