WO2006129643A1 - プラズマ処理装置およびプラズマ処理方法 - Google Patents
プラズマ処理装置およびプラズマ処理方法 Download PDFInfo
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- WO2006129643A1 WO2006129643A1 PCT/JP2006/310746 JP2006310746W WO2006129643A1 WO 2006129643 A1 WO2006129643 A1 WO 2006129643A1 JP 2006310746 W JP2006310746 W JP 2006310746W WO 2006129643 A1 WO2006129643 A1 WO 2006129643A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- 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
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32192—Microwave generated discharge
- H01J37/32211—Means for coupling power to the plasma
- H01J37/3222—Antennas
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- 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
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32192—Microwave generated discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- 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
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32623—Mechanical discharge control means
- H01J37/32633—Baffles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- 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
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32715—Workpiece holder
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- 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
- H10P14/6302—Non-deposition formation processes
- H10P14/6304—Formation by oxidation, e.g. oxidation of the substrate
- H10P14/6306—Formation by oxidation, e.g. oxidation of the substrate of the semiconductor materials
- H10P14/6308—Formation by oxidation, e.g. oxidation of the substrate of the semiconductor materials of Group IV semiconductors
- H10P14/6309—Formation by oxidation, e.g. oxidation of the substrate of the semiconductor materials of Group IV semiconductors of silicon in uncombined form, i.e. pure silicon
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- 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
- H10P14/6302—Non-deposition formation processes
- H10P14/6319—Formation by plasma treatments, e.g. plasma oxidation of the substrate
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- 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
- H10P14/69—Inorganic materials
- H10P14/692—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses
- H10P14/6921—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses containing silicon
- H10P14/69215—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses containing silicon the material being a silicon oxide, e.g. SiO2
Definitions
- the present invention relates to a plasma processing apparatus for processing a target substrate such as a semiconductor substrate using plasma and performing a process of forming an oxide film, a nitride film, an oxynitride film or the like on the surface of the target substrate, and And a plasma processing method.
- an acid treatment of silicon or the like is performed for the purpose of forming an insulating film.
- a silicon oxide film is extremely stable and also has a function as a protective film for external force. Therefore, the film formation technique is indispensable for manufacturing semiconductor devices.
- a technique for forming a high-quality silicon oxide film with a thin film thickness of 1 nm or less is required.
- thermal oxidation method has been used to form an oxide film on a silicon surface.
- thermal oxidation performed at a high temperature of about 1000 ° C has a problem that thermal damage such as re-diffusion of doped impurities occurs.
- thermal oxidation such as LP-CV D and RTO (Rapid Thermal Oxidation) has a problem that it is difficult to control the film thickness when a thin film of several nm is formed.
- Patent Document 1 In the presence of a processing gas containing at least, a plasma processing apparatus provided with a partition plate having an opening has been proposed (for example, Patent Document 1). .
- Patent Document 1 International Publication WO2004Z047157
- Patent Document 1 is an excellent method that can reduce plasma damage by a partition plate having an opening. In the case of forming an oxide film with a thin film thickness of 1.5 nm or less (particularly, In m or less). It is not considered whether this is applicable.
- an object of the present invention is to provide a plasma processing apparatus and a plasma processing method capable of controlling the film thickness even when forming a thin film when forming a silicon oxide film or the like using plasma. There is.
- a processing chamber for accommodating a substrate to be processed
- a substrate holder for placing a substrate to be processed in the processing chamber
- a plasma bending means for bending a plasma flow of a processing gas supplied from an upper portion of the processing chamber toward a substrate to be processed placed on the substrate holding table.
- the plasma bending means may be configured such that two or more plates formed with a plurality of through openings are arranged so that the positions of the through openings do not overlap.
- the plate is made of a dielectric.
- the gap adjusting member is preferably a ring-shaped member.
- the plasma bending means can be a plate made of a porous dielectric.
- the porosity of the porous dielectric is preferably 70 to 80%.
- the plasma processing apparatus includes a planar antenna having a plurality of slots for introducing a microwave into the processing chamber.
- a treatment is performed in a treatment chamber of a plasma oxidation treatment apparatus.
- a plasma processing method for forming a silicon oxide film by applying an oxygen-containing plasma to silicon on a surface of a substrate to perform an acid treatment is performed in a treatment chamber of a plasma oxidation treatment apparatus.
- a plasma processing method for performing processing by interposing a plasma bending means for bending a plasma flow between a plasma generation region in the processing chamber and the substrate to be processed.
- the plasma bending means may be configured such that two or more plates formed with a plurality of through openings are arranged so that the positions of the through openings do not overlap.
- the plate is made of a dielectric.
- the plasma bending means may be a plate made of a porous dielectric.
- the porosity of the porous dielectric is preferably 70 to 80%.
- the thickness of the oxide film to be formed can be set to 1 nm or less.
- the oxygen-containing plasma is preferably formed by introducing a microwave into the processing chamber using a planar antenna having a plurality of slots.
- the plasma processing apparatus of the present invention includes plasma bending means for bending the plasma flow when the plasma passes. Therefore, the action of ions in the plasma can be suppressed and the progress of the oxidization reaction or nitridation reaction can be adjusted.
- a thin silicon oxide film with a thickness of 1.5 nm, particularly lnm or less can be formed while controlling the film thickness with high accuracy. Further, since the uniformity of the formed oxide film is good, the utility value is high in the process of manufacturing a semiconductor device that is being miniaturized.
- FIG. 1 is a schematic cross-sectional view showing an example of a plasma oxidation processing apparatus according to a first embodiment of the present invention.
- FIG. 2A is a plan view for explaining a double plate.
- FIG. 2B is a cross-sectional view of an essential part for explaining a double plate.
- FIG. 3 is a drawing for explaining an antenna member.
- FIG. 4 is a principle diagram for explaining the operation of the double plate.
- FIG. 5A is a schematic diagram showing a cross-sectional structure of a wafer from which elements are separated in the process of manufacturing a transistor.
- FIG. 5B is a schematic diagram showing a state in which plasma oxidation treatment is performed for the purpose of forming a gate insulating film in the transistor manufacturing process!
- FIG. 5C is a schematic view showing a state where a 5C] transistor is formed.
- FIG. 6 is a schematic cross-sectional view showing an example of a plasma oxidation processing apparatus according to a second embodiment of the present invention.
- FIG. 7 is a schematic cross-sectional view showing an example of a plasma oxidation processing apparatus according to a third embodiment of the present invention.
- FIG. 8 is a schematic cross-sectional view showing an example of a plasma oxidation treatment apparatus according to a fourth embodiment of the present invention.
- FIG. 9 is a schematic sectional view showing an example of a plasma oxidation processing apparatus according to a fifth embodiment of the present invention.
- FIG. 10 is a schematic sectional view showing an example of a plasma oxidation treatment apparatus according to the sixth embodiment of the present invention.
- FIG. 11 is a graph showing the relationship between the plasma acid treatment time and the film thickness of the oxide film in Example 1 and the like.
- FIG. 12 is a graph showing the relationship between the processing time of the plasma acid treatment and the film thickness of the oxide film in Example 2 and the like.
- FIG. 13 is a graph showing the relationship between the processing time of the plasma acid treatment in Example 2 and the uniformity of the oxide film.
- FIG. 14 is a graph showing the relationship between the processing time of the plasma oxidation treatment of Example 3 and the film thickness and uniformity of the oxidation film.
- FIG. 15 is a graph showing the relationship between the film thickness and uniformity of the acid film of the plasma acid treatment in Examples 4 to 6 and the like.
- FIG. 16 is a graph showing the relationship between the processing time of the plasma acid treatment and the film thickness of the oxide film in Examples 4 to 6 and the like.
- FIG. 17 is a drawing for explaining a gap ring.
- FIG. 18 is a drawing for explaining another embodiment of a double plate.
- FIG. 19 is a drawing for explaining still another embodiment of the double plate. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a cross-sectional view schematically showing an example of a plasma oxidation treatment apparatus according to the first embodiment of the present invention.
- This plasma oxidation treatment apparatus generates plasma by introducing microwaves into a processing chamber with a planar antenna having a plurality of slots, particularly RLSA (Radial Line Slot Antenna). It is configured as an RLSA microwave plasma oxidation treatment device that can generate microwave plasma with high density and low electron temperature. For example, it is used for various semiconductor devices such as MOS transistors and MOSFETs (field effect transistors). In the manufacturing process, it can be suitably used for the purpose of forming a silicon oxide film. In addition, it can utilize also as a plasma nitridation processing apparatus in order to form a silicon nitride film by changing the process gas supplied to nitrogen-containing gas.
- the plasma oxidation treatment apparatus 100 includes a substantially cylindrical chamber 1 that is airtight and grounded.
- a circular opening 10 is formed at a substantially central portion of the bottom wall la of the chamber 11, and an exhaust chamber 11 that communicates with the opening 10 and protrudes downward is provided on the bottom wall la. ing.
- a susceptor 2 having a ceramic force such as A1N for horizontally supporting a silicon wafer (hereinafter simply referred to as "Ueno") W, which is an object to be processed, is provided in the chamber 11.
- the susceptor 2 is supported by a support member 3 that also has a ceramic force such as a cylindrical A1N that extends above the bottom center force of the exhaust chamber 11.
- a guide ring 4 for guiding the wafer W is provided on the outer edge of the susceptor 2.
- a resistance heating type heater 5 is embedded in the susceptor 2. The heater 5 is supplied with power from a heater power source 6 to heat the susceptor 2, and the wafer W as an object to be processed is heated by the heat. Heat.
- the temperature can be controlled in the range from room temperature to 800 ° C.
- a cylindrical liner 7 having a quartz force is provided on the inner periphery of the chamber 11 to prevent metal contamination due to the material constituting the chamber 1 and to keep the inside of the chamber 11 in a clean atmosphere.
- a baffle plate 8 having a large number of through holes is provided in an annular shape on the outer peripheral side of the susceptor 2 in order to uniformly evacuate the chamber 11, and the baffle plate 8 includes a plurality of support columns 9. Is supported by The kaffle plate 8 can be made of a material such as quartz or ceramics.
- the susceptor 2 is provided with wafer support pins (not shown) for supporting the wafer W and moving it up and down so as to protrude and retract with respect to the surface of the susceptor 2.
- a double plate 60 is provided above the susceptor 2 as plasma bending means for bending the plasma flow.
- the double plate 60 forms a flow path with a labyrinth structure.
- a first space S is formed above the double plate 60, and a second space S is formed below the double plate 60.
- This double plate 60 is shown in Figure 1.
- the upper plate 61 having the through hole 61a and the lower plate 62 having the through hole 62a are configured. These upper and lower plates 61, 62 bend the flow of the plasma that passes through them, restricting the ions in the plasma to be supplied linearly toward Weno and W, trapping ions, and reducing ion energy It works to let you.
- the upper and lower plates 61 and 62 are, for example, quartz, sapphire, SiN, SiC, Al 2 O
- the material of the upper and lower plates 61 and 62 high-purity quartz having very few impurities such as metal and alkali metal is used.
- the total amount of impurities in the quartz member is preferably 50 ppm or less! /.
- the upper plate 61 and the lower plate 62 are connected at a plurality of locations by connecting members 71 provided in the vicinity of the peripheral edge, and are arranged in parallel with a predetermined distance (described later).
- the connecting member 71 also functions as a spacer that adjusts the distance between the upper and lower plates 61 and 62.
- the lower plate 62 is supported by engaging an outer peripheral portion of the lower plate 62 with a support portion 70 protruding from the liner 7 in the chamber 11 toward the inside.
- the mounting position of the plates 61 and 62 is preferably close to the wafer W.
- the distance between the lower end of the lower plate 62 and the wafer W is, for example, about 10 mm, preferably 3 to 20 mm. Is more preferable.
- the distance between the upper end of the upper plate 61 and the lower end of the microwave transmitting plate 28 (described later) is preferably about 35 mm, preferably 20 to 50 mm. More preferable.
- FIG. 2A shows a state in which the upper and lower plates 61 and 62 are overlapped and viewed from above, and FIG.
- the thickness (T) of the upper plate 61 and the thickness (T) of the lower plate 62 are both
- the distance (L) between the two plates 61 and 62 is, for example, preferably about 3 to: LO mm, more preferably set to 5 mm.
- the through holes 61a of the upper plate 61 and the through holes 62a of the lower plate 62 are arranged substantially evenly so as to cover the mounting area of the wafer W indicated by the broken line in FIG. 2A. Then, as shown in FIGS. 2A and 2B, in a state where the two plates 61 and 62 are stacked, the through hole 62a of the lower plate 62 and the through hole 61a of the upper plate 61 do not overlap. They are formed out of position with respect to each other. That is, the through hole 6 la and the through hole 62 a are arranged so as to form a labyrinth structure in which an opening that connects the upper surface of the upper plate 61 linearly to the wafer surface is not formed.
- the diameter D of the through hole 61a and the diameter D of the through hole 62a can be arbitrarily set.
- the through hole 6 la of the upper plate 61 and the through hole 62a of the lower plate 62 that have different sizes depending on the position of the through hole 61a or 62a in the same plate have different sizes. It can also be formed.
- any arrangement such as concentric circles, radial shapes, spiral shapes, lattice shapes, and staggered shapes can be selected as long as the positions of the holes are shifted between the upper and lower plates 61 and 62.
- the through holes 61a and 62a may have a triangular shape such as a triangle or a quadrangle, an elliptical shape, or a slit shape.
- the positional deviation between the through hole 61a and the through hole 62a that is, the wall 61b constituting the through hole 61a of the upper plate 61 and the wall 62b constituting the through hole 62a of the lower plate 62, Distance lL can determine the optimum condition in relation to the distance L between the upper and lower plates 61, 62.
- T that is, the height of the walls 61b and 62b
- D that is, the height of the walls 61b and 62b
- D diameters D and D of the through holes 61a and 62a
- an annular gas introduction member 15 is provided on the side wall of the chamber 11 above the double plate 60, and a gas supply system 16 is provided in the gas introduction member 15. It is connected.
- the gas introduction member may be arranged in a nozzle shape or a shower shape.
- This gas supply system 16 includes, for example, an Ar gas supply source 17 and an O gas supply source 18, which
- the gas reaches the gas introduction member 15 through the gas line 20 and is introduced into the chamber 11 from the gas introduction member 15.
- Each of the gas lines 20 is provided with a mass flow controller 21 and front and rear opening / closing valves 22.
- a rare gas such as He, Kr, or Xe may be used in place of the Ar gas.
- An exhaust pipe 23 is connected to a side surface of the exhaust chamber 11, and an exhaust device 24 including a high-speed vacuum pump is connected to the exhaust pipe 23.
- an exhaust device 24 including a high-speed vacuum pump is connected to the exhaust pipe 23.
- the exhaust device 24 is uniformly discharged into the space 1 la of the exhaust chamber 11 through the gas force baffle plate 8 in the chamber 11 and exhausted through the exhaust pipe 23.
- the inside of the chamber 11 can be depressurized at a high speed to a predetermined degree of vacuum, for example, 0.133 Pa.
- a loading / unloading port 25 for loading / unloading the wafer W to / from a transfer chamber (not shown) adjacent to the plasma oxidation treatment apparatus 100, and the loading / unloading port 25.
- a gate valve 26 that opens and closes!
- the upper portion of the chamber 11 is an opening, and an annular upper plate 27 is joined to the opening.
- the inner peripheral lower part of the upper plate 27 faces the inner space of the chamber. It protrudes and forms an annular support portion 27a.
- Microwave transmission plate that transmits microwaves by supporting ceramics such as quartz, Al 2 O, and A1N on support 27a.
- An antenna member 31 is provided above the microwave transmission plate 28 so as to face the susceptor 2.
- the antenna member 31 is configured, for example, as a disk-shaped planar antenna, and is locked to the upper end of the side wall of the chamber 1.
- the antenna member 31 also has a copper plate or aluminum plate force with a surface plated with gold or silver, and has a structure in which a large number of microwave radiation holes (slots) 32 are formed through a predetermined pattern.
- the microwave radiation holes 32 have, for example, a long groove shape as shown in FIG. 3.
- adjacent microwave radiation holes 32 are arranged in a “T” shape, and the plurality of microwave radiation holes 32 are arranged. 32 are arranged concentrically.
- the length and the arrangement interval of the microwave radiation holes 32 are determined according to the wavelength (g) of the microwave.
- the distance between the microwave radiation holes 32 is gZ4, gZ2, or g.
- the interval between adjacent microwave radiation holes 32 formed concentrically is indicated by Ar.
- the microwave radiation hole 32 may have another shape such as a circular shape or an arc shape.
- the arrangement form of the microwave radiation holes 32 is not particularly limited, and the microwave radiation holes 32 may be arranged concentrically, for example, spirally or radially.
- the antenna member 31 may have a rectangular plate shape. In this case, a plurality of rows of microwave radiation holes 32 are arranged in series, and the rows of adjacent microwave radiation holes 32 are formed in parallel. Good.
- a slow wave member 33 having a dielectric constant larger than that of vacuum is provided on the upper surface of the antenna member 31.
- the material of the slow wave material 33 for example, fluorine-based resin such as quartz and polytetrafluoroethylene, polyimide resin and the like are preferable.
- the slow wave material 33 has a function of adjusting the wavelength of the microwave to be short. Since the wavelength of the microwave becomes longer in a vacuum, the wavelength of the microwave is shortened by providing the slow wave material 33 so that the microwave can be efficiently supplied to the microwave radiation hole 32. It should be noted that the antenna member 31 and the microwave transmission plate 28 and the slow wave member 33 and the antenna member 31 may be brought into contact with each other or may be separated from each other. ,.
- a shield lid 34 made of a metal material such as aluminum or stainless steel is provided on the upper surface of the chamber 11 so as to cover the antenna member 31 and the slow wave material 33.
- the shield lid 34 also has a waveguide function for propagating microwaves in the plane direction.
- the upper surface of the chamber 11 and the shield lid 34 are sealed by a seal member 35.
- a cooling water flow path 34a is formed in the shield lid 34, and the shield lid 34, the slow wave material 33, the antenna member 31, and the microwave transmission plate 28 are cooled by allowing cooling water to flow therethrough. It is like that. By cooling these members, the slow wave member 33, the antenna member 31 and the microwave transmission plate 28 can be prevented from being deformed or damaged by heat, and a stable plasma can be formed.
- the shield lid 34 is grounded.
- An opening 36 is formed in the center of the upper wall of the shield lid 34, and a waveguide 37 is connected to the opening.
- a microwave generator 39 is connected to the end of the waveguide 37 via a matching circuit 38. Thereby, for example, a microwave having a frequency of 2.45 GHz generated by the microwave generator 39 is propagated to the antenna member 31 through the waveguide 37.
- the microwave frequency 8.35 GHz, 1.98 GHz, or the like can be used.
- the waveguide 37 includes a coaxial waveguide 37a having a circular cross section extending upward from the opening 36 of the shield lid 34, and a mode converter 40 at the upper end of the coaxial waveguide 37a. And a rectangular waveguide 37b extending in the horizontal direction.
- the mode change 40 between the rectangular waveguide 37b and the coaxial waveguide 37a has a function of converting the microphone mouth wave propagating in the TE mode in the rectangular waveguide 37b into the TEM mode.
- An inner conductor 41 extends at the center of the coaxial waveguide 37a, and the inner conductor 41 is connected and fixed to the center of the antenna member 31 at the lower end thereof. Thereby, the microwave is efficiently and uniformly propagated radially and to the antenna member 31 through the inner conductor 41 of the coaxial waveguide 37a.
- Each component of the plasma oxidation processing apparatus 100 is connected to and controlled by a process controller 50 having a CPU.
- the process controller 50 includes a keyboard for the process manager to input commands to manage the plasma oxidation treatment apparatus 100, a display that visualizes and displays the operating status of the plasma oxidation treatment apparatus 100, etc.
- the user interface 51 is connected! [0039]
- the process controller 50 records a control program (software), processing condition data, and the like for realizing various processes executed by the plasma oxide treatment apparatus 100 under the control of the process controller 50.
- the storage unit 52 where the recipe is stored is connected.
- recipes such as the control program and processing condition data may be stored in a computer-readable storage medium such as a CD-ROM, a hard disk, a flexible disk, or a flash memory, or other recipes may be used. For example, it is possible to transmit the data from time to time via a dedicated line and use it online.
- the silicon oxide film is formed by oxidizing the silicon layer of the wafer W by the following procedure. it can.
- the gate valve 26 is opened, and the Ueno, W, on which the silicon layer is formed from the loading / unloading port 25, is loaded into the chamber 1 and placed on the susceptor 2. Then, Ar gas and O gas are introduced at a predetermined flow rate from the Ar gas supply source 17 and the O gas supply source 18 of the gas supply system 16.
- the flow rate of rare gas such as Ar is set to 200 to 3000 mLZmin (sccm), O gas.
- the microwave from the microwave generator 39 is guided to the waveguide 37 through the matching circuit 38, and sequentially passes through the rectangular waveguide 37b, the mode converter 40, and the coaxial waveguide 37a. Is supplied to the antenna member 31 via the inner conductor 41 and the microwave radiation of the antenna member 31 is released. The light is emitted from the injection hole 32 through the microwave transmitting plate 28 into the space above the Weno and W in the chamber 11. The microwave propagates in the TE mode in the rectangular waveguide 37b, and the TE mode microwave is converted into the TEM mode by the mode change 40 and propagates in the coaxial waveguide 37a toward the antenna member 31. And An electromagnetic field is formed in the chamber 11 by the microwave radiated from the antenna member 31 through the microwave transmitting plate 28 to the chamber 11, and Ar gas and O gas are turned into plasma. At this time, the power of the microwave generator 39
- This microwave plasma is substantially 1 X 1 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ in the first space S, which is a plasma generation region, when microwaves are radiated from the many microwave radiation holes 32 of the antenna member 31. 12 / ⁇ !! Plasma with a high density of 3 and an electron temperature of approximately 1 to 2 eV.
- the plasma passes through the double plate 60.
- the ion density in the plasma can be reduced to 1 X 10 9 to less than 1 X 10 11 / cm 3 and the electron temperature can be reduced to 0.7 eV or less. Plasma damage due to ions etc. can be further reduced.
- oxygen is introduced into silicon by the action of active species in the plasma, mainly oxygen radicals (O *), to form Si—O bonds, and a high-quality silicon oxide film is formed.
- FIG. 4 is a principle diagram schematically showing the pattern of the plasma oxidation treatment of the wafer W by the plasma oxidation treatment apparatus 100.
- the microwave supplied from the antenna member 31 of the plasma oxidation treatment apparatus 100 and Ar The plasma generated by the action of / O gas is placed on the susceptor 2 in the space inside the chamber 11.
- a double plate 60 (upper plate 61 and lower plate 62) is provided, so that ions are trapped when passing through this, and the ion energy of the plasma is weakened.
- the plasma branches into a plurality of flows when passing through the through hole 61a of the upper plate 61.
- the plasma flow then merges between the upper plate 61 and the lower plate 62 and then branches again when passing through the through-hole 62a of the lower plate 62, so that the lower plate 62 Rejoin below.
- the double plate 60 that forms the flow path of the labyrinth structure prevents ions in the plasma from reaching the wafer W linearly. As shown in FIG.
- the positions of the two plates are overlapped so that the through hole 62a of the lower plate 62 and the through hole 61a of the upper plate 61 do not overlap. It is important to form them (see Fig. 2A and Fig. 2B).
- Such an arrangement (labyrinth structure) of the through holes 61a and 62a makes it possible to selectively pass oxygen radicals while blocking the passage of ions in the plasma. Oxygen radicals that have passed through the upper and lower plates 61 and 62 react with the silicon exposed on the wafer W to form SiO (oxide film).
- Such plasma oxidation treatment apparatus 100 is characterized by a very thin, dense, high-quality silicon oxide film (SiO film) or silicon nitride of lnm or less, for example, about 0.3 to 0.8 nm. Film (SiN film) and silicon oxynitride film (SiON film) are formed
- the method of the present invention can be applied to the manufacturing process of various semiconductor devices such as MOS transistors.
- 5A to 5C are diagrams illustrating an example in which the plasma processing method of the present invention is applied in the process of manufacturing a transistor.
- a well (not shown) is formed on a P-type or N-type Si substrate 101, and an element isolation layer 102 is formed by, for example, the LOCOS method.
- the silicon substrate 101 is preferably washed with a 1% dilute hydrofluoric acid (DHF) solution in advance to remove the oxide film.
- DHF dilute hydrofluoric acid
- the element isolation layer 102 may be formed by STI (Shallow Trench Isolation).
- plasma oxide treatment is performed to form a gate oxide film (SiO film) 103 on the surface of the silicon substrate 101.
- SiO film silicon oxide film
- the gate oxide film 103 is formed mainly by the action of oxygen radicals, and a high-quality gate oxide film 103 with little film damage caused by ions is obtained.
- the thickness of the gate oxide film 103 varies depending on the target device, but can be, for example, 1 nm or less, preferably about 0.3 to 0.8 nm.
- a polysilicon layer 104 is formed on the formed gate oxide film 103 by, for example, CVD, and then etched using a mask patterned by a photolithography technique to form a gate electrode.
- the gate electrode structure is not limited to the single layer of the polysilicon layer 104.
- tungsten, molybdenum, tantalum, titanium, their silicides, nitrides, alloys are used for the purpose of reducing the specific resistance of the gate electrode and increasing the speed. It is also possible to make a laminated structure including the like.
- the gate electrode thus formed is subjected to ion implantation and activation treatment to form a source Z drain (not shown), and a side wall 105 made of an insulating film is formed.
- a MOS structure transistor 110 can be manufactured.
- FIG. 6 is a cross-sectional view schematically showing an example of a plasma oxidation treatment apparatus according to the second embodiment of the present invention.
- a porous plate 63 made of quartz is provided instead of the double plate 60 of the plasma oxidation treatment apparatus 100 of FIG.
- the porous plate 63 has a porosity of about 75%, and is attenuated by collision of ions in the plasma with the porous plate 63 when the oxygen-containing plasma passes through the pores. Therefore, it functions as a plasma bending means in the same manner as the double plate 60 in the first embodiment (FIG. 1).
- the porosity of the porous plate 63 is preferably 65 to 85%, more preferably 70 to 80%.
- porous plate 63 As a material of the porous plate 63, a material other than quartz can be used as long as it is a porous dielectric. 6 is the same as that of the plasma oxidation treatment apparatus 100 of FIG. 1, and therefore the same reference numerals are used for the description. Omitted.
- the plasma bending means has a flow path for passing plasma, such as the double plate 60 shown in FIG. 1 and the porous plate 63 shown in FIG.
- the form is not limited.
- FIG. 7 is a cross-sectional view schematically showing an example of a plasma oxidation treatment apparatus according to the third embodiment of the present invention.
- the gas introduction member 15a and the gas introduction member 15b are provided above and below the double plate 60 with the double plate 60 interposed therebetween.
- These gas introduction members 15 a and 15 b are provided in an annular shape on the side wall of the chamber 11 and are connected to the gas supply system 16. That is, the gas introduction member 15a is, for example, Ar gas supply source 17, and the gas introduction member 15b is, for example, O gas supply source 18.
- the gas introduction members 15a and 15b are respectively introduced into the chamber 11.
- the gas introduction site is composed of a gas introduction member 15a for introducing a rare gas such as Ar,
- reaction system gas is introduced by the gas introduction member 15b and interposing the double plate 60 between them, only the rare gas introduced into the region above the double plate 60 is used. Plasma can be generated. Since the plasma generated by the rare gas alone passes through the double plate 60 and its ion energy and electron temperature are reduced, a reaction system such as O is present in the region below the double plate 60.
- FIG. 8 is a cross-sectional view showing a schematic configuration of a plasma oxidation treatment apparatus 400 according to the fourth embodiment of the present invention.
- the plasma oxidation processing apparatus 400 can be configured as an ECR (Electron Cyclotron Resonance) type microwave plasma processing apparatus.
- Reference numeral 401 denotes a magnetron, which is a microwave oscillation source.
- the magnetron 401 is connected to the discharge chamber 405 via a rectangular waveguide 402, a circular waveguide 403, and a tapered waveguide 404.
- the discharge chamber 405 is made of a material such as high-purity aluminum.
- a vacuum chamber 406 is provided below the discharge chamber 405.
- a quartz plate 407 for supplying microwaves to the discharge chamber 405 is provided between the tapered waveguide 404 and the discharge chamber 405.
- Solenoid coils 408 and 409 are provided around the discharge chamber 405, and are configured so that a magnetic field can be applied to the discharge chamber 405.
- a mounting table (susceptor 410) for mounting the wafer W is provided below the discharge chamber 405.
- the susceptor 410 includes heating means such as a resistance heater (not shown).
- the susceptor 410 is connected to an RF power source 411 for bias.
- a double plate 430 is provided above the susceptor 410, that is, between the quartz plate 407 and the susceptor 410, as a plasma bending means for bending the plasma flow when passing through the susceptor 410.
- the double plate 430 forms a labyrinth-structure flow path.
- a first space S is formed above the double plate 430, and a second space S is formed below the double plate 430.
- This double plate 430 has an upper plate with a through hole 43 la.
- the lower plate 432 having a rate 431 and a through-hole 432a is used, and its structure and function are the same as those of the double plate 60 in the plasma processing apparatus 100 of FIG.
- Reference numerals 433 and 434 are support members for supporting the plates 431 and 432, respectively.
- a gas introduction part 412 is provided on the side wall above the double plate 430, and a gas supply system 413 is connected to the gas introduction part 412.
- the gas supply system 413 includes, for example, an Ar gas supply source 414 and an O gas supply source 415.
- Each ska reaches the gas introduction part 412 via the gas line 416 and is introduced into the discharge chamber 405 from the gas introduction part 412.
- Each of the gas lines 416 is provided with a mass flow controller 417 and front and rear opening / closing valves 418.
- the vacuum chamber 406 is connected to an exhaust device 420 having a vacuum pump for decompressing and exhausting the inside of the vacuum chamber 406 through an exhaust pipe 419, and the inside of the vacuum chamber 406 is decompressed to a high vacuum state. It is configured to be able to.
- an opening 406a for carrying a wafer in and out is formed in a side portion of the vacuum chamber 406, and a gate valve 421 is provided on the outside thereof.
- a magnetron 401 is attached to a rectangular waveguide 402. For example, it oscillates 2.45GHz microwave.
- a predetermined magnetic field distribution is set in the discharge chamber 405 by the solenoid coils 408 and 409.
- the processing gas is introduced from the gas supply system 413 through the gas line 416 into the discharge chamber 405 through the gas introduction unit 412.
- the processing gas is turned into plasma in the first space S in the discharge chamber 405, and the wafer W is oxidized by the radical-based plasma that has passed through the double plate 430.
- FIG. 9 is a cross-sectional view showing a schematic configuration of a plasma oxidation processing apparatus 500 according to the fifth embodiment of the present invention.
- the plasma oxidation treatment apparatus 500 is configured as an inductively coupled plasma (ICP) apparatus.
- ICP inductively coupled plasma
- the plasma oxidation treatment apparatus 500 has a bottomed cylindrical chamber 521 with an open top, and a gas supply unit 545 and a gasket 546 that are continuously disposed above the chamber 521.
- a closed cylindrical bell jar 522 and a processing vessel 520 which also has a force.
- a susceptor (substrate mounting table) 523 for horizontally supporting the wafer W, which is the object to be processed, is arranged in a state supported by a cylindrical support member 532.
- a recess 524 is formed on the upper surface of the susceptor body 527 in substantially the same shape as the wafer W, and the wafer W is placed in the recess 524.
- a disk-shaped lower electrode 525 formed in a mesh shape is embedded below the recess 524, and a heating element 526 is embedded below the lower electrode 525.
- the susceptor 523 is a susceptor that also has insulator strength like ceramics such as A1N and AlO.
- a lower electrode 525 for applying a bias voltage and a heating element 526 made of tandastain, molybdenum or the like are embedded, and the susceptor body 527 and the heating element 526
- the ceramic heater is made up of.
- a DC power supply 541 is connected to the heating element 526. By supplying power from the power supply 541, the heating element 526 can be heated and the wafer W can be heated to a predetermined temperature.
- annular shadow ring 530 made of a dielectric material such as quartz, A1N, Al 2 O or the like is provided above the susceptor 523 so as to cover the edge of the wafer W placed in the recess 524.
- the shadow ring 530 is connected to an annular member 534 via a support column 533 connected to the lower surface thereof, and an elevating mechanism 537 is connected to the annular member 534 via a rod-like member 536.
- an elevating mechanism 537 is connected to the annular member 534 via a rod-like member 536.
- a double plate 580 is provided above the susceptor 523 as plasma bending means for bending the plasma flow when passing through the susceptor 523.
- the double plate 580 forms a flow path with a labyrinth structure.
- a first space S is formed above the double plate 580, and a second space S is formed below the double plate 580.
- the heavy plate 580 is composed of an upper plate 581 having a through hole 581a and a lower plate 582 having a through hole 582a, and the structure and function thereof are the same as the double plate 60 in the plasma processing apparatus 100 of FIG. Since it is the same, description is abbreviate
- Reference numerals 583 and 584 are support members for supporting the plates 581 and 582, respectively.
- a high-frequency power source 539 having a frequency of 13.56 MHz, for example, is connected to the lower electrode 525 through a matching unit 538, and a predetermined power is supplied from the high-frequency power source 539 to the lower electrode 525.
- the bias voltage can be applied.
- an annular gas supply unit 545 and a gasket 546 are provided between the chamber 521 and the bell jar 522. From the gas discharge holes formed over the entire circumference of the gas supply unit 545, Gas supplied from a gas supply mechanism 560 described later is in the processing container 520. To be supplied. Further, the side wall of the chamber 521 has an opening 547, and a gate valve 548 is provided at a position corresponding to the opening 547 outside the chamber 521, and the wafer W is opened with the gate valve 548 open. Are transported between the adjacent load lock chamber (not shown) and the chamber 521.
- the bell jar 522 is formed of an electrically insulating material such as quartz or a ceramic material, and a coil 542 as an antenna serving as a plasma generating means is wound around the outside thereof.
- a high frequency power supply 544 having a frequency of, for example, 450 kHz is connected to the coil 542 via a matching device 543.
- ICP Inductively coupled plasma
- the gas supply mechanism 560 supplies Ar gas supply source 561 for supplying Ar gas and O gas.
- O gas supply source 562 O gas supply source 562.
- a gas line 563 is connected to the Ar gas supply source 561.
- a mass flow controller 567 and front and rear opening / closing valves 565 and 569 are provided on the gas line 563.
- a gas line 564 is connected to the O gas supply source 562,
- a mass flow controller 568 and front and rear opening / closing valves 566, 570 are provided on the gas line 564. These gas lines 563 and 564 are connected to a gas line 571, and the gas line 571 is connected to a gas supply unit 545.
- an exhaust pipe 550 is connected to the bottom wall of the chamber 521, and an exhaust device 551 including a vacuum pump is connected to the exhaust pipe 550!
- an exhaust device 551 including a vacuum pump is connected to the exhaust pipe 550!
- the gate valve 548 is opened, the wafer W is loaded into the chamber 521 by a transfer device (not shown), and the wafer support pins (not shown) protruded from the susceptor 523 with the shadow ring 530 raised. ) Deliver wafer W on top.
- the wafer support pins and the shadow ring 530 are lowered, the wafer W is placed on the susceptor 523, and the outer peripheral edge of the wafer W is masked by the shadow ring 530.
- the gate valve 548 is closed, and the inside of the processing vessel 520 is evacuated by the exhaust device 551 to make a predetermined pressure reduction state. This Predetermined into processing vessel 520 from Ar gas supply source 561 and O gas supply source 562 under reduced pressure
- the active species can be easily attracted to the wafer W.
- the power supply 541 supplies power to heat the heating element 526, and the wafer W is heated to a predetermined temperature while performing the oxidation treatment.
- the wafer W is oxidized by the radical-based plasma that has passed through the double plate 580.
- the gas supply amount is adjusted to adjust the pressure in the processing container 520, the wafer W is lifted by protruding the support pin from the susceptor 523, the gate valve 548 is opened, and the wafer W is opened by a transfer device (not shown). The process in the plasma oxidation treatment apparatus 500 is completed.
- the ICP-type plasma oxidation processing apparatus 500 Even with the double plate 580, it is possible to control the film thickness with low plasma damage and high accuracy even for thin films. Possible plasma oxidation treatment or the like can be performed.
- a bell jar 522 having a flat top is used.
- an ICP type plasma processing apparatus having a hemispherical bell jar also has a double plate 580. Can be deployed.
- FIG. 10 is a cross-sectional view showing a schematic configuration of a plasma oxidation treatment apparatus 600 according to the sixth embodiment of the present invention.
- the plasma oxidation treatment apparatus 600 is configured as a Magneguchin type.
- the plasma oxidation processing apparatus 600 has a vacuum vessel 601 that constitutes a processing chamber.
- the vacuum vessel 601 is configured by joining an upper vessel 602 and a lower vessel 603 up and down.
- the upper container 602 is made of ceramics such as alumina or quartz, for example.
- the lower container 603 is made of metal.
- the upper container 602 has a substantially flat ceiling portion, and a shower head 604 force S is provided on the ceiling portion.
- a diffusion chamber 605 is formed inside the shower head 604. .
- a gas inlet 606 for introducing a processing gas is formed in the upper center of the shower head 604 and communicates with the diffusion chamber 605.
- a large number of openings 607 are formed at the lower end of the shower head 604, and a plurality of kinds of processing gases introduced from the gas introduction port 606 are mixed and diffused in the diffusion chamber 605, and the opening of the shower head 604 is formed. 607 will be supplied to the processing space in the vacuum vessel 601!
- a susceptor 608 that is a mounting table that supports a wafer W that is a substrate to be processed is disposed.
- the susceptor 608 is provided with a heater (not shown) for heating the wafer W to a predetermined temperature.
- the lower container 603 is provided with an exhaust port 609, and this exhaust port 609 is connected to an exhaust device 610 provided with a vacuum pump or the like.
- a cylindrical electrode 611 is arranged in a state where the outer peripheral surface force of the upper container 602 is also separated at a predetermined interval.
- the cylindrical electrode 611 is connected to a high frequency power supply 613 via a matching unit 612.
- the high-frequency power source 613 is configured to be able to supply high-frequency power having a frequency of, for example, 13.56 MHz to the cylindrical electrode 611.
- two permanent magnets 614 and 615 formed in a ring shape are arranged around the upper container 602. These two permanent magnets 614 and 615 are magnetized opposite to each other in the radial direction, and the inside of the vacuum vessel 601 is directed to the center direction from the upper permanent magnet 614 and then reversed to the lower side. Magnetic field lines returning to the permanent magnet 615 are formed.
- the gas supply mechanism 616 supplies Ar gas supply source 617 that supplies Ar gas and O gas.
- O gas supply source 618 O gas supply source 618.
- Gas line 619a is connected to Ar gas supply source 617
- the mass flow controller 620 and front and rear opening / closing valves 62 and 621 are provided on the gas line 619a.
- a gas line 619b is connected to the O gas supply source 618, and the gas line 619b is connected to the O gas supply source 618.
- a mass flow controller 620 and front and rear opening / closing valves 621 and 621 are provided.
- the gas lines 619a and 619b are connected to a gas line 622, and the gas line 622 is connected to a gas inlet 606.
- a double plate 630 is provided above the susceptor 608 as a plasma bending means for bending the plasma flow when passing through the susceptor 608.
- This double plate 630 thus, a flow path having a labyrinth structure is formed.
- a first space S is formed above the double plate 630, and a second space S is formed below the double plate 630.
- the heavy plate 630 includes an upper plate 631 having a through hole 631a and a lower plate 632 having a through hole 632a.
- the structure and function of the heavy plate 630 are the same as the double plate 60 in the plasma processing apparatus 100 of FIG. Since it is the same, description is abbreviate
- Reference numerals 633 and 634 are support members for supporting the plates 631 and 632, respectively.
- the wafer W is placed on the susceptor 608 by a transfer device (not shown). Then, by operating the exhaust device 610, the gas in the vacuum vessel 601 is exhausted through the exhaust port 609, and the vacuum vessel 601 is evacuated. Next, the susceptor 608 is heated, and the temperature of the wafer W is heated to a predetermined temperature.
- the processing gas from the gas supply mechanism 616 is introduced from the gas inlet 606.
- the processing gas introduced from the gas inlet 606 is diffused in the diffusion chamber 605 and supplied to the first space S in the vacuum vessel 601 from the opening 607 of the shower head 604.
- a predetermined high frequency power is supplied from the high frequency power supply 613 to the cylindrical electrode 611.
- magnetic lines of force are formed by the permanent magnets 614 and 615, and a high frequency electric field is formed by the cylindrical electrode 611 to generate plasma.
- the wafer W on the susceptor 608 is processed, and, for example, a silicon oxide film is formed.
- the wafer W is oxidized by the radical-based plasma that has passed through the double plate 630.
- the supply of high frequency power from the high frequency power supply 613 is stopped, and the gas in the vacuum vessel 601 is exhausted from the exhaust port 609. Then, the wafer W on the susceptor 608 is unillustrated and unloaded from the vacuum container 601 using a transfer device, and the process is terminated.
- plasma oxidation processing apparatus 600 magnetron discharge is generated in vacuum vessel 601 by the magnetic field of permanent magnets 614 and 615, and high-density plasma is generated in the space above wafer W. Then, a plasma oxidation process is performed on the surface of the wafer W on the susceptor 608 by the generated high-density plasma. In this way, even with the magnetron ICP-type plasma acid treatment device 600, the double plate 630 can be used to control the film thickness with high accuracy even with low plasma damage. Plasma oxidation treatment, etc. Can be done.
- a silicon oxide film was formed by oxidizing the Si substrate using a plasma oxidation treatment apparatus 100 having the same configuration as in FIG.
- a through hole 61a having a diameter of 5 mm was used, and as the lower plate 62, a through hole 62a having a diameter of 5 mm was used.
- the material of the upper plate 61 and the lower plate 62 is quartz with few impurities.
- the distance between the upper and lower plates 61, 62 was 5 mm.
- the plasma treatment condition in the oxidation treatment step is that ArZO is used as a treatment gas at a flow rate of 200.
- wafer temperature is 400 ° C
- pressure is 266.6 Pa (2 Torr)
- plasma power is 2. OkW
- processing time is 10 seconds, 20 seconds, 40 seconds or Performed in 60 seconds.
- the Si substrate is subjected to an oxidation treatment under the same conditions as in Example 1 by a plasma oxidation treatment device having the same configuration as the plasma oxidation treatment device 100 of FIG. A silicon oxide film was formed.
- Example 1 The thickness of the silicon oxide film obtained in Example 1 and Comparative Example 1 was measured with an ellipsometer. The relationship between processing time and film thickness is shown in FIG.
- a silicon oxide film having a film thickness of about 1 nm is formed by plasma oxidation treatment for 10 seconds, and the film thickness increases as the treatment time increases thereafter. increased.
- the oxide film was formed using the plasma oxide film treatment apparatus 100 of FIG. 1 equipped with the double plate 60, the film thickness did not exceed lnm even after the treatment for 40 seconds. It was shown that the controllability of the film thickness in the case of the thin film is high.
- a silicon oxide film was formed by oxidizing the Si substrate using the plasma oxidation treatment apparatus 100 including the double plate 60 having the same configuration as in Example 1.
- the plasma treatment conditions in the acid treatment process are as follows: ArZO is used as the treatment gas. Used at 0Z20 [mLZmin (sccm)], wafer temperature is 400 ° C, pressure is 66.7 Pa (500 m Torr), plasma power is 2. OkW, processing time is 10 seconds, 20 seconds, 40 seconds Did less than 60 ⁇ .
- the Si substrate was subjected to an acid treatment under the same conditions as in Example 2 using a plasma acid treatment device having the same configuration as the plasma acid treatment device 100 of FIG. A silicon oxide film was formed.
- the thickness of the silicon oxide film obtained in Example 2 and Comparative Example 2 was measured with an ellipsometer.
- the relationship between processing time and film thickness is shown in FIG. 12, and the relationship between processing time and uniformity is shown in FIG.
- a silicon oxide film having a thickness of about 1.8 nm was formed by the plasma oxide treatment for 10 seconds.
- the film thickness was about 0.8 nm even after 40 seconds of treatment. In other words, it was shown that the double plate 60 is effective in controlling the film thickness in thin film formation.
- Example 2 was much more excellent in uniformity than Comparative Example 2 in which the double plate 60 was not provided.
- a silicon oxide film was formed by oxidizing the Si substrate using the plasma oxidation treatment apparatus 100 including the double plate 60 having the same configuration as in Example 1.
- the plasma processing conditions in the oxidation process are ArZO as a processing gas at a flow rate of 2000Z5 [mLZmin (sccm)].
- the wafer temperature was 400 ° C
- the pressure was 66.7 Pa (500 mTorr)
- the supply rate to the plasma was 2.0 kW
- the processing time was 5, 10, 20, and 40 seconds.
- the thickness of the obtained silicon oxide film was measured with an ellipsometer.
- Figure 14 shows the relationship between processing time, oxide film thickness, and uniformity.
- Fig. 14 shows that the O ratio (O ZAr ratio) in the processing gas is set to 1Z400, so that 5-10
- a silicon oxide film was formed by oxidizing the Si substrate using the plasma oxidation treatment apparatus 100 including the double plate 60 having the same configuration as in Example 1.
- the plasma treatment conditions in the oxidation treatment process are Ar and O as treatment gases, and the flow rate ratio and treatment pressure are as follows.
- the plasma oxidation treatment apparatus having the same configuration as that of the plasma oxidation treatment apparatus 100 of FIG. 1 except that the double plate 60 was not provided was performed under the following conditions.
- the wafer temperature was 400 ° C.
- the supply ratio to plasma was 2. OkW
- the processing time was 5 to 60 seconds.
- the thickness of the obtained silicon oxide film was measured with an ellipsometer.
- FIG. 15 shows the relationship between the film thickness and uniformity of the silicon oxide film
- FIG. 16 shows the relationship between the processing time and the film thickness. From FIG. 15, in Examples 4 to 6 using the plasma oxidation apparatus 100 equipped with the double plate 60, an extremely thin silicon oxide film having a thickness of about 0.5 to 1. Onm was formed. However, the uniformity of the film thickness within the wafer surface was approximately 1.5% or less, and fluctuations due to the gas flow rate ratio and processing pressure were small. Further, FIG. 16 shows that the film thickness does not exceed 1 nm even when the processing time is 40 seconds, and it is easy to control the film thickness even in the case of a thin film.
- Comparative Example 3 where the double plate 60 was used, a relatively good in-plane uniformity was obtained, but the film thickness exceeded lnm, and it was difficult to control the film thickness in the case of a thin film. Met.
- Comparative Example 4 which uses a double plate 60, the film thickness is 1.5 in a short time. It exceeded the nm, and the uniformity could not be controlled. From the above results, by using the double plate 60, a very thin silicon oxide film with a film thickness of about 0.5 to 1. Onm can be formed with high accuracy in film thickness and in-plane uniformity. It was shown that it can be done.
- a member having a labyrinth structure For example, a remote plasma method, ICP method, ECR method, magnetron method, surface reflection wave method, etc. may be used. .
- the force using the microwave plasma processing apparatus that excites plasma with microwaves having a frequency of 300 MHz to 300 GHz can also be used.
- the plasma oxidation treatment apparatus is taken as an example.
- the plasma processing apparatus of the present invention can be configured as a plasma nitriding apparatus provided with the double plate 60 and the porous plate 63.
- an annular gap ring 72 may be interposed to adjust the distance between the upper and lower plates 61 and 62.
- the diameter of the gap ring 72 may be long enough to surround the area where the through holes 6 la and 62 a of the upper and lower plates 61 and 62 are disposed.
- the shape of the through holes 61a, 62a of the double plate 60 is not limited to a circle, and may be any shape, for example, a square shape or an elongated slit.
- a plate 64 and a lower plate 65 provided with slits 64a and 65a formed so as to be displaced from each other.
- the upper plate 66 having a plurality of rectangular through holes 66a and the lower plate 67 having a plurality of rectangular through holes 67a are seen through from above. You may arrange
- the opening areas and ratios of the through holes 61a, 62a, etc., the slits 64a, 65a, etc. can be appropriately adjusted according to the plasma oxidation treatment conditions.
- FIGS. 5A to 5C as an example of the plasma processing using the plasma oxidation processing apparatus 100 of the present invention, the formation of the gate insulating film in the gate electrode of the MOS transistor or the like is described, but the present invention is not limited thereto. It is not done.
- nitriding for gate insulating film formation, oxidation of polysilicon for capacitor lower electrode, oxidation before high-k (high dielectric constant) gate insulating film formation, selective oxidation of polysilicon sidewall of flash memory It can also be applied to the formation of an acid film in processing.
- the plasma processing apparatus and the plasma processing method of the present invention can be suitably used in the manufacturing process of various semiconductor devices.
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Abstract
Description
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| US11/916,166 US20090029564A1 (en) | 2005-05-31 | 2006-05-30 | Plasma treatment apparatus and plasma treatment method |
| JP2007518998A JPWO2006129643A1 (ja) | 2005-05-31 | 2006-05-30 | プラズマ処理装置およびプラズマ処理方法 |
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| US (1) | US20090029564A1 (ja) |
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| JP2007149788A (ja) * | 2005-11-24 | 2007-06-14 | Aqua Science Kk | リモートプラズマ装置 |
| JP2009099962A (ja) * | 2007-09-28 | 2009-05-07 | Canon Inc | 酸化膜の形成方法及び撮像装置 |
| TWI482220B (zh) * | 2008-09-30 | 2015-04-21 | 東京威力科創股份有限公司 | Method and device for forming silicon oxide film |
| WO2010038654A1 (ja) * | 2008-09-30 | 2010-04-08 | 東京エレクトロン株式会社 | シリコン酸化膜の形成方法及び装置 |
| JP2010087185A (ja) * | 2008-09-30 | 2010-04-15 | Tokyo Electron Ltd | シリコン酸化膜の形成方法、コンピュータ読み取り可能な記憶媒体およびプラズマ酸化処理装置 |
| US8389420B2 (en) | 2008-09-30 | 2013-03-05 | Tokyo Electron Limited | Method and apparatus for forming silicon oxide film |
| US10224221B2 (en) | 2013-04-05 | 2019-03-05 | Lam Research Corporation | Internal plasma grid for semiconductor fabrication |
| JP2014239210A (ja) * | 2013-04-05 | 2014-12-18 | ラム リサーチ コーポレーションLam Research Corporation | 半導体製造用の内部プラズマグリッド |
| US11171021B2 (en) | 2013-04-05 | 2021-11-09 | Lam Research Corporation | Internal plasma grid for semiconductor fabrication |
| US10134605B2 (en) | 2013-07-11 | 2018-11-20 | Lam Research Corporation | Dual chamber plasma etcher with ion accelerator |
| JP2018117137A (ja) * | 2013-08-07 | 2018-07-26 | 北京北方華創微電子装備有限公司Beijing Naura Microelectronics Equipment Co., Ltd. | プレクリーニングチャンバおよび半導体処理装置 |
| JP2016058500A (ja) * | 2014-09-08 | 2016-04-21 | 国立大学法人東北大学 | 半導体素子の形成方法 |
| US10685859B2 (en) | 2016-08-31 | 2020-06-16 | Tokyo Electron Limited | Plasma processing apparatus |
| JP2021530876A (ja) * | 2018-07-27 | 2021-11-11 | アプライド マテリアルズ インコーポレイテッドApplied Materials, Incorporated | 改良されたイオンブロッカを備えた遠隔容量結合プラズマ源 |
| JP7418401B2 (ja) | 2018-07-27 | 2024-01-19 | アプライド マテリアルズ インコーポレイテッド | 改良されたイオンブロッカを備えた遠隔容量結合プラズマ源 |
| WO2021246020A1 (ja) * | 2020-06-01 | 2021-12-09 | 東京エレクトロン株式会社 | プラズマ処理装置及びプラズマ処理方法 |
| JPWO2021246020A1 (ja) * | 2020-06-01 | 2021-12-09 | ||
| JP7443516B2 (ja) | 2020-06-01 | 2024-03-05 | 東京エレクトロン株式会社 | プラズマ処理装置及びプラズマ処理方法 |
| KR20220016788A (ko) * | 2020-08-02 | 2022-02-10 | 어플라이드 머티어리얼스, 인코포레이티드 | 게이트 올 어라운드 나노시트 i/o 디바이스에 대한 등각 산화 |
| JP2023536856A (ja) * | 2020-08-02 | 2023-08-30 | アプライド マテリアルズ インコーポレイテッド | ゲートオールアラウンドナノシート入出力デバイスのためのコンフォーマル酸化 |
| US12243941B2 (en) | 2020-08-02 | 2025-03-04 | Applied Materials, Inc. | Conformal oxidation for gate all around nanosheet I/O device |
| JP7678082B2 (ja) | 2020-08-02 | 2025-05-15 | アプライド マテリアルズ インコーポレイテッド | ゲートオールアラウンドナノシート入出力デバイスのためのコンフォーマル酸化 |
| KR102865228B1 (ko) | 2020-08-02 | 2025-09-26 | 어플라이드 머티어리얼스, 인코포레이티드 | 게이트 올 어라운드 나노시트 i/o 디바이스에 대한 등각 산화 |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200709296A (en) | 2007-03-01 |
| CN101189708A (zh) | 2008-05-28 |
| KR20080000684A (ko) | 2008-01-02 |
| KR100997868B1 (ko) | 2010-12-01 |
| JPWO2006129643A1 (ja) | 2009-01-08 |
| US20090029564A1 (en) | 2009-01-29 |
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