WO2013011673A1 - 洗浄方法、処理装置及び記憶媒体 - Google Patents
洗浄方法、処理装置及び記憶媒体 Download PDFInfo
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- WO2013011673A1 WO2013011673A1 PCT/JP2012/004521 JP2012004521W WO2013011673A1 WO 2013011673 A1 WO2013011673 A1 WO 2013011673A1 JP 2012004521 W JP2012004521 W JP 2012004521W WO 2013011673 A1 WO2013011673 A1 WO 2013011673A1
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- gas
- cleaning
- chamber
- wafer
- gas cluster
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- 238000000034 method Methods 0.000 title claims description 94
- 238000012545 processing Methods 0.000 title claims description 91
- 238000003860 storage Methods 0.000 title claims description 10
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- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 27
- 239000001569 carbon dioxide Substances 0.000 abstract description 27
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- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 23
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 22
- 238000005406 washing Methods 0.000 description 19
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 229910052710 silicon Inorganic materials 0.000 description 11
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- 229910052732 germanium Inorganic materials 0.000 description 4
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- 239000007864 aqueous solution Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
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- 230000001276 controlling effect Effects 0.000 description 1
- 230000002079 cooperative effect Effects 0.000 description 1
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- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 1
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- JOHWNGGYGAVMGU-UHFFFAOYSA-N trifluorochlorine Chemical compound FCl(F)F JOHWNGGYGAVMGU-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02046—Dry cleaning only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
- H01L21/02068—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- 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
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/3086—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67028—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67028—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
- H01L21/6704—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing
- H01L21/67051—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing using mainly spraying means, e.g. nozzles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67063—Apparatus for fluid treatment for etching
- H01L21/67069—Apparatus for fluid treatment for etching for drying etching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67115—Apparatus for thermal treatment mainly by radiation
Definitions
- the present invention relates to a cleaning method, a processing apparatus, and a storage medium in which the method is stored, which removes deposits such as particles attached to the surface of an object to be processed.
- Patent Documents 1 and 2 are known as techniques for removing particles and dirt adhering to the surface of a substrate (hereinafter referred to as a “wafer”) that is an object to be processed such as a semiconductor wafer. Yes.
- the surface of the wafer is irradiated with a gas cluster ion beam.
- the physical shearing force is adjusted by the acceleration voltage and the ionization amount so as to overcome the adhesion force of the deposit to the wafer.
- the device structure formed on the wafer is miniaturized, the device structure is easily damaged by the gas cluster ion beam. That is, for example, when a gas cluster ion beam is irradiated onto a pattern formed of a groove and a line formed on a wafer, the width of the line is, for example, on the order of several tens of nanometers. There is a risk that the line will collapse due to irradiation. Even if the pattern is not formed, the surface shape of the wafer is deteriorated after irradiation with the gas cluster ion beam.
- Patent Document 3 describes a technique in which a natural oxide film on a substrate 9 is removed using a chemical solution, and then air to which ultrasonic vibration is applied is ejected, and Patent Document 4 describes a technique on the surface of the substrate. A technique for irradiating a pulsed laser is described. However, these Patent Documents 3 and 4 do not mention the removal of particles in a fine device structure or the damage received on the wafer.
- the present invention has been made under such circumstances, the purpose thereof is a cleaning method capable of easily removing deposits such as particles adhering to the surface of the target object while suppressing damage to the target object.
- a processing apparatus and a storage medium storing the method are provided.
- the cleaning method of the present invention comprises: In the cleaning method for removing the deposit from the surface of the object to be deposited, A step of performing a pretreatment including an etching treatment on at least one of the surface of the object to be treated and the deposit; A cleaning gas having no reactivity with respect to the film exposed on the surface of the object to be processed is discharged from a region having a pressure higher than that of the process atmosphere in which the object to be processed is placed. Generating a gas cluster which is an assembly of atoms or molecules of the cleaning gas; Irradiating the surface of the object to be processed, which has been subjected to the pretreatment, with a gas cluster of a cleaning gas to remove deposits.
- the pretreatment may include a modification process for at least one of the surface of the object to be processed and an attached substance, and an etching process for the modified layer modified by the modification process.
- the step of performing the pretreatment and the step of removing the deposits may be performed simultaneously.
- the pretreatment may include a step of irradiating a gas cluster to perform the etching process.
- the step of irradiating the gas cluster to perform the etching process may be performed using the same generation mechanism as the generation mechanism that irradiates the gas cluster in the step of irradiating the gas cluster of the cleaning gas and removing the deposits. Good or different generation mechanisms may be used.
- the step of irradiating the gas cluster of the cleaning gas to remove deposits and the step of irradiating the gas cluster to perform the etching process include arranging a plurality of generation mechanisms for irradiating the gas cluster, and the generation mechanism The step of irradiating the gas cluster may be used.
- the step of irradiating the gas cluster of the cleaning gas to remove deposits and the step of irradiating the gas cluster to perform the etching process have a variable angle with respect to the object to be processed in the generation mechanism that irradiates the gas cluster. It may be performed in a state.
- the processing apparatus of the present invention In the processing apparatus of the object to be processed, which removes the object from the surface of the object to be processed, A pretreatment chamber in which an object to be treated is placed; A pre-processing module having a pre-processing mechanism for performing a pre-processing including an etching process on at least one of a surface of an object to be processed or an attached substance placed in the pre-processing chamber; A cleaning chamber in which the object to be processed is placed; A cleaning gas that is provided in the cleaning processing chamber and has no reactivity with the film exposed on the surface of the object to be processed is processed from a region having a higher pressure than the processing atmosphere inside the cleaning processing chamber.
- a gas cluster nozzle that discharges to the atmosphere, generates a gas cluster that is an aggregate of atoms or molecules of the cleaning gas by adiabatic expansion, and supplies the pre-processed object to remove the deposits When, And a transport mechanism for delivering an object to be processed to the pretreatment chamber and the cleaning chamber.
- the pretreatment chamber is a normal pressure treatment chamber whose interior is maintained in a normal pressure atmosphere, and is connected to a normal pressure transfer chamber that conveys the object to be processed in a normal pressure atmosphere
- the cleaning processing chamber is a vacuum processing chamber whose interior is maintained in a vacuum atmosphere, and is hermetically connected to a vacuum transfer chamber that transfers the object to be processed in a vacuum atmosphere.
- a load lock chamber for switching the internal atmosphere is provided between the normal pressure transfer chamber and the vacuum transfer chamber.
- the normal pressure transfer chamber and the vacuum transfer chamber may be provided with a normal pressure transfer mechanism and a vacuum transfer mechanism as the transfer mechanism, respectively.
- the pretreatment chamber and the cleaning treatment chamber are vacuum treatment chambers each maintained in a vacuum atmosphere
- a vacuum transfer chamber in which the transfer mechanism is arranged may be provided between the pretreatment chamber and the cleaning treatment chamber in an airtight manner.
- the pretreatment chamber and the cleaning treatment chamber may be shared.
- a vacuum processing chamber for performing a vacuum processing performed prior to the preprocessing or a vacuum processing subsequent to the removal of deposits may be airtightly connected to the vacuum transfer chamber.
- the storage medium of the present invention is A storage medium storing a computer program used on a processing apparatus for cleaning an object to be processed and operating on a computer,
- the computer program is characterized in that steps are set so as to implement the above-described cleaning method.
- pretreatment including etching treatment is performed on at least one of the surface of the object to be processed and the deposit to facilitate the removal of the deposit from the surface of the object to be processed, and then exposed to the surface of the object to be processed
- a gas cluster is generated by using a cleaning gas that is not reactive with the film being formed. Therefore, even when the gas cluster of the cleaning gas is irradiated in a non-ionized state, the deposit is easily detached and removed from the object to be processed, so that the object can be easily removed while suppressing damage to the object to be processed. There is an effect that can be removed.
- FIG. 1 A first embodiment of the cleaning method of the present invention will be described with reference to FIGS. First, the configuration of the wafer W to which this cleaning method is applied and the outline of the cleaning method will be described.
- the wafer W is made of silicon (Si), and a pattern 7 including, for example, a groove 5 as a concave portion and a line 6 as a convex portion is formed on the surface.
- this cleaning method suppresses the occurrence of damage to the wafer W such as the fall of the line 6 or the film roughness of the surface of the wafer W, and the deposit 10 on the surface of the wafer W as shown in FIG. Is configured to be easily removed.
- the deposit 10 is obtained by a plasma etching process when the pattern 7 is formed on the wafer W or a plasma ashing process performed after the plasma etching process.
- This is a residue produced.
- the deposit 10 includes carbon (C), which is a residue of a photoresist mask made of an inorganic material including silicon removed from the inside of the groove 5 and an organic material stacked on the upper layer of the wafer W. It is composed of organic matter.
- C carbon
- the deposit 10 is not simply on the surface of the wafer W, but when viewed microscopically, as shown in FIG.
- a natural oxide film formed on the W surface Surrounded by a natural oxide film formed on the W surface, it is strongly attached. That is, for example, a natural oxide film is formed on the surface of the wafer W so as to surround the deposit 10, and the deposit 10 is thereby buried in the natural oxide film. That is, the deposit 10 is held on the wafer W through the bridge formed on the surface of the wafer W.
- the surface of the wafer W is oxidized when the wafer W is transported in the atmosphere, for example, and becomes a natural oxide film 11 made of silicon oxide (SiO 2).
- the thickness dimension of the natural oxide film 11 is, for example, about 1 nm.
- a region made of silicon below the natural oxide film 11 is referred to as a base film 12 in the following description.
- the surface of the wafer W and the deposit 10 may be chemically coupled to each other, for example, but in order to simplify the description, the wafer W and the deposit 10 are already described. It is assumed that it is held by cross-linking formed between the ten. Further, the surface shapes and dimensions of the wafer W and the deposit 10 are schematically shown in FIG. The same applies to the subsequent figures.
- vapor of an aqueous hydrogen fluoride (HF) solution is supplied to the wafer W as a pretreatment.
- the natural oxide film 11 described above is dissolved by the hydrogen fluoride vapor to form silicon fluoride, which is exhausted as a gas.
- the bridge formed between the wafer W and the deposit 10 is also etched, and the surface of the wafer W recedes downward when viewed from the deposit 10, as shown in FIG. It will be exposed.
- the adhering material 10 that is buried in the natural oxide film on the surface of the wafer W and is strongly adsorbed on the wafer W is weakened by the pretreatment. That is, the deposit 10 is exposed by etching the surface of the wafer W, and is in a state of being in slight contact with the surface of the wafer W. At this time, as described later, when the deposit 10 contains silicon oxide, the deposit 10 is also etched by the vapor of hydrogen fluoride. Here, attention is paid to the surface of the wafer W. Explained. In FIG. 4, the upper surface of the wafer W (base film 12) and the lower surface of the deposit 10 are drawn apart from each other, but actually, the base film 12 and the deposit 10 are slightly in contact with each other. Yes.
- An apparatus for supplying hydrogen fluoride vapor to the wafer W is configured by combining a known vaporizer and a processing container, and will be described later together with a processing apparatus for performing a cleaning method.
- FIG. 5 shows an example of the nozzle 23 for generating gas clusters.
- the nozzle 23 includes a pressure chamber 32 formed in a substantially cylindrical shape so as to extend in the vertical direction and open at the lower end portion, and a gas diffusion portion 33 connected to the lower end portion of the pressure chamber 32.
- the gas diffusion portion 33 is horizontally reduced in diameter from the peripheral edge of the lower end of the pressure chamber 32 toward the central portion of the pressure chamber 32 to form an orifice portion 32a, and downward from the orifice portion 32a. It is formed so as to increase in diameter as it goes.
- the opening diameter in the orifice portion 32a and the separation distance between the orifice portion 32a and the wafer W on the mounting table 22 are, for example, about 0.1 mm and 6.5 mm, respectively.
- a gas supply path 34 for supplying, for example, carbon dioxide (CO 2) gas into the pressure chamber 32 is connected to the upper end side of the nozzle 23.
- the processing pressure in the processing atmosphere is set to a vacuum atmosphere of about 1 to 100 Pa, for example, and carbon dioxide gas is supplied to the nozzle 23 at a pressure of about 0.3 to 2.0 MPa, for example.
- carbon dioxide gas is supplied to the processing atmosphere, it is cooled below the condensation temperature by abrupt adiabatic expansion, so that the molecules of each other are combined by van der Waals forces to form an aggregate gas cluster.
- the gas cluster flow path below the gas supply path 34 and the nozzle 23 is not provided with an ionization device for ionizing the gas cluster. Irradiated vertically toward the wafer W in a non-ionized state.
- the deposit 10 on the surface of the wafer W has a very weak adhesion with the wafer W due to the pretreatment, and is slightly in contact with the surface of the base film 12. Therefore, when the gas cluster collides with the deposit 10 on the wafer W, the deposit 10 is blown off from the surface of the wafer W by the discharge pressure of the gas cluster as shown in FIG. At this time, the gas cluster is composed of carbon dioxide gas having no reactivity with the base film 12. Further, the gas cluster is not ionized and is irradiated onto the wafer W in a non-ionized state.
- the underlying film 12 which is the surface portion of the wafer W exposed by the above-described pretreatment is prevented from being scraped off by the irradiation of the gas cluster, and the electric wiring formed in the underlying film 12 is There is no risk of charging up. Therefore, damage to the electrical wiring does not occur or the damage is suppressed to a very low level. Therefore, the surface of the wafer W after the gas cluster irradiation remains in a state following the surface of the natural oxide film 11.
- the deposit 10 is removed over the surface and the cleaning process is performed. Is done.
- water is generated as a by-product of the natural oxide film 11 dissolved by the hydrogen fluoride vapor already described, the remaining water is suppressed by heating the wafer W by a temperature control mechanism to be described later. can do.
- FIG. 6 An apparatus for supplying hydrogen fluoride vapor to the wafer W will be described with reference to FIG.
- a processing vessel 42 in which a mounting table 41 on which a wafer W is placed is provided, and a vaporizer 43 which is a preprocessing mechanism for supplying vapor of an aqueous hydrogen fluoride solution into the processing vessel 42.
- a pre-processing module is provided in FIG. 6, reference numeral 44 denotes a transfer port for the wafer W, and reference numeral 45 denotes a heater for suppressing the vaporization of hydrogen fluoride on the surface of the wafer W on the mounting table 41.
- a gas supply path 46 extending from the vaporizer 43 is connected to the ceiling surface of the processing container 42 so as to face the wafer W on the mounting table 41.
- Hydrogen fluoride vapor is supplied to the wafer W from a gas supply path 46 together with a carrier gas such as nitrogen (N2) gas.
- N2 nitrogen
- V and M are a valve and a flow rate adjusting unit, respectively.
- Exhaust ports 51 for exhausting the atmosphere in the processing vessel 42 are formed in, for example, a plurality of locations on the floor surface of the processing vessel 42, and an exhaust passage 52 extending from the exhaust port 51 has a butterfly valve or the like.
- a vacuum pump 54 is connected via the pressure adjustment unit 53.
- this apparatus is provided with a cleaning processing chamber 21 for storing the wafer W and removing the deposits 10, and the cleaning processing chamber 21 includes a wafer processing chamber 21.
- a mounting table 22 for mounting W is arranged.
- a protrusion 21a that protrudes in a cylindrical shape toward the upper side is formed at the center of the ceiling surface of the cleaning chamber 21, and the nozzle 23 described above serves as a gas cluster generation mechanism in the protrusion 21a.
- the nozzle 23 faces downward in the vertical direction.
- reference numeral 40 denotes a transfer port
- G denotes a gate valve that opens and closes the transfer port 40.
- a support pin is provided so as to penetrate the through-hole formed in the mounting table 22.
- the wafer W is moved up and down with respect to the mounting table 22 by the cooperative action of the lifting mechanism (not shown) provided on the mounting table 22 and the support pins, and a wafer transfer arm (not shown) outside the cleaning processing chamber 21.
- the wafer W is transferred between the two.
- One end side of an exhaust path 24 for evacuating the atmosphere in the cleaning process chamber 21 is connected to the floor surface of the cleaning process chamber 21, and a pressure such as a butterfly valve is connected to the other end side of the exhaust path 24.
- a vacuum pump 26 is connected via the adjusting unit 25.
- the mounting table 22 is configured to be movable in the horizontal direction in the cleaning processing chamber 21 so that the nozzle 23 is relatively scanned over the surface of the wafer W on the mounting table 22.
- the floor surface of the cleaning chamber 21 below the mounting table 22 is configured to be movable along the X-axis rail 27 and the X-axis rail 27 extending horizontally along the X-axis direction.
- Y-axis rail 29 is provided.
- the mounting table 22 described above is supported above the Y-axis rail 29.
- the mounting table 22 is provided with a temperature control mechanism (not shown) for adjusting the temperature of the wafer W on the mounting table 22.
- One end side of a gas supply path 34 extending through the ceiling surface of the cleaning chamber 21 is connected to the upper end of the pressure chamber 32, and the other end side of the gas supply path 34 is connected to a valve 36 and a flow rate adjusting unit.
- a gas source 37 in which carbon dioxide is stored is connected via 35.
- the pressure chamber 32 is provided with a pressure gauge (not shown), and is configured so that the flow rate of gas supplied into the pressure chamber 32 via the pressure gauge is adjusted by a control unit 67 described later. Yes.
- the angle and distance of the nozzle 23 with respect to the mounting table 22 may be adjusted by a driving unit (not shown).
- the angle and distance of the nozzle 23 are adjusted in this way, the deposit 10 removed from the wafer W is prevented from reattaching to the wafer W, or damage to the pattern 7 is reduced. Furthermore, the deposit 10 attached to the bottom surface of the groove 5 is easily removed. As will be described later, even when the gas cluster is irradiated in the pretreatment, the angle and distance of the nozzle 23 may be adjusted similarly.
- carry-in / out ports 60 for placing FOUP1 which is a sealed transfer container storing 25 wafers W
- An atmospheric transfer chamber 61 is provided along the line 60.
- a wafer transfer mechanism 61a constituted by an articulated arm for transferring the wafer W is provided as a normal pressure transfer mechanism.
- An alignment chamber 62 for adjusting the orientation and positioning of the wafer W is provided on the side of the atmospheric transfer chamber 61.
- the alignment chamber 62 is provided on the side of the atmospheric transfer chamber 61.
- the processing container 42 described above is connected so as to face 62.
- a load lock chamber 63 for switching the atmosphere between the atmospheric pressure atmosphere and the air atmosphere is airtightly connected to the surface of the air transfer chamber 61 opposite to the carry-in / out port 60.
- the load lock chamber 63 is provided in two places side by side.
- a vacuum transfer chamber 64 When viewed from the atmospheric transfer chamber 61, a vacuum transfer chamber 64 provided with a transfer arm 64a, which is a vacuum transfer mechanism for transferring the wafer W in a vacuum atmosphere, is airtight behind the load lock chambers 63 and 63. It is connected to the. In the vacuum transfer chamber 64, the above-described cleaning processing chamber 21 is airtightly provided.
- the vacuum transfer chamber 64 includes an etching chamber 65 in which a plasma etching process for forming the pattern 7 on the wafer W is performed and an ashing chamber 66 in which a plasma ashing process for the photoresist mask is performed. It is connected to the.
- a processing chamber for performing, for example, a CVD (Chemical Vapor Deposition) process which is a process after removing the deposit 10, may be connected to the vacuum transfer chamber 64 in an airtight manner.
- This processing apparatus is provided with a control unit 67 composed of a computer for controlling the operation of the entire apparatus.
- the memory of the control unit 67 stores a program for performing an etching process and an ashing process in addition to the pre-processing and the cleaning process described above.
- This program has a set of steps so as to execute the operation of the apparatus corresponding to the processing on the wafer W.
- the program is installed in the control unit 67 from the storage unit 68 which is a storage medium such as a hard disk, a compact disk, a magneto-optical disk, a memory card, and a flexible disk.
- the wafer W is taken out of the FOUP 1 by the wafer transfer mechanism 61a.
- a photoresist mask patterned so as to correspond to the pattern 7 described above is laminated.
- the wafer W is loaded into the load lock chamber 63 set in an air atmosphere.
- the wafer W is transferred in this order by the transfer arm 64a through the etching processing chamber 65 and the ashing processing chamber 66 to form the pattern 7 already described. Ashing processing is performed in this order.
- the wafer W is transferred into the processing container 42 through the load lock chamber 63 and the atmospheric transfer chamber 61 and subjected to the pre-processing described above, and then transferred into the cleaning processing chamber 21 to be irradiated with the gas cluster. Is done. Thereafter, the processed wafer W is returned to the original FOUP 1 through the load lock chamber 63 and the atmospheric transfer chamber 61.
- the deposit 10 when removing the deposit 10 adhering to the surface of the wafer W, hydrogen fluoride vapor is supplied to the wafer W as a pretreatment, and the natural oxide film on the surface of the wafer W is obtained. 11 is dissolved. For this reason, the deposit 10 is in a state of being slightly in contact with the surface of the wafer W, and the adhesion force with the surface becomes extremely weak. Therefore, the deposit 10 is easily removed by irradiating the deposit 10 with a gas cluster made of carbon dioxide gas. Therefore, when the deposit 10 is removed, even if the wafer W is formed with the fine pattern 7 as described above, for example, the irradiation rate of the gas cluster can be suppressed. Damage can be suppressed.
- the carbon dioxide gas has no reactivity with the base film 12 of the wafer W.
- the gas cluster is irradiated to the wafer W without being ionized. Therefore, when the gas cluster is irradiated to the wafer W, the occurrence of damage that causes the surface of the wafer W to become rough or physically scraped can be suppressed. Further, since the gas cluster is not ionized, for example, the above-described cleaning processing chamber 21 does not require a device for ionizing the gas or the gas cluster, so that the cost of the device can be suppressed.
- the adhesion of the deposit 10 to the entire surface of the wafer W is reduced at a time by the pretreatment. Therefore, compared to an example in which the deposit 10 is removed using only a gas cluster of a conventional reactive gas, for example, it can be uniformly processed in a short time, so that the throughput can be increased. Furthermore, by combining pretreatment and gas cluster irradiation, it is possible to reduce the amount of gas or chemical used compared with the case where the deposit 10 is removed using only gas, gas cluster, or chemical. At this time, since the chemical solution is not supplied to the wafer W in both the pretreatment and the gas cluster irradiation, the cost required for the waste solution treatment can be suppressed.
- the surface of the wafer W is changed from the non-conductive natural oxide film 11 to the conductive undercoat film 12, so that the surface has conductivity. Therefore, even if the deposit 10 and the natural oxide film 11 are adsorbed to each other by, for example, electrostatic force in addition to the above-described physical fixing force, the electrostatic force is eliminated or weakened by pretreatment.
- the deposit 10 is easily removed from the wafer W. Even if the natural oxide film 11 and the deposit 10 are chemically bonded to each other, the bonded natural oxide film 11 is etched, so that the deposit is as described above. 10 can be easily removed.
- the surface layer of the base film 12 is oxidized. Specifically, as shown in FIG. 9, for example, ozone gas that is an oxidizing gas is supplied to the surface of the wafer W. By this ozone gas, the surface layer of the base film 12 in contact with the deposit 10 is slightly oxidized, for example, by 1 nm, and an oxide film 13 as a modified layer is generated. Thereafter, the supply of the hydrogen fluoride vapor and the irradiation of the gas cluster made of carbon dioxide gas are performed in this order, whereby the deposit 10 is removed along with the oxide film 13 over the surface. .
- ozone gas that is an oxidizing gas is supplied to the surface of the wafer W.
- the pretreatment is performed by oxidizing the base film 12 with ozone gas and supplying hydrogen fluoride vapor.
- an apparatus for supplying ozone gas to the wafer W an apparatus including an ozone gas supply source (not shown) is used instead of the vaporizer 43 in FIG.
- ozone gas is supplied to the wafer W, but ozone water (an aqueous solution containing ozone gas) may be supplied instead of the ozone gas.
- ozone water an aqueous solution containing ozone gas
- FIG. 1 An example of a pretreatment module in which ozone water is supplied to the wafer W will be briefly described with reference to FIG.
- the manner in which the base film 12 is oxidized by ozone water, the subsequent etching treatment of the oxide film 13 and the irradiation of the gas cluster are the same as in the above-described example, and thus the description thereof is omitted.
- This apparatus is provided with a processing container 81 for supplying ozone water to the wafer W and a spin chuck 82 serving as a mounting table for mounting the wafer W thereon.
- the spin chuck 82 is configured to support the central portion on the lower surface side of the wafer W and to be rotatable and raised and lowered around the vertical axis by the driving unit 83.
- an ozone water nozzle 84 for discharging ozone water to the wafer W is provided as a pretreatment mechanism.
- a lid 85 for sealing an atmosphere for pre-processing the wafer W so as to face the wafer W on the spin chuck 82 can be raised and lowered by an elevator mechanism (not shown).
- the previously described ozone water nozzle 84 is attached to the center of the lid 85.
- a ring-shaped exhaust path 86 is formed on the side of the spin chuck 82 so as to face the peripheral edge of the wafer W in the circumferential direction.
- a vacuum pump 88 is connected to the lower surface side of the exhaust path 86 via a pressure adjustment mechanism 87 such as a butterfly valve.
- 81a is a transfer port for the wafer W
- 81b is a shutter for opening and closing the transfer port 81a.
- the processing container 81 when ozone water is discharged from the ozone water nozzle 84 to the central portion of the wafer W that is adsorbed and held by the spin chuck 82 and rotates around the vertical axis, the ozone water is caused by centrifugal force. The film is stretched toward the peripheral edge of the wafer W to form a liquid film over the surface of the wafer W.
- the spin chuck 82 rotates at a high speed and the ozone water is spun off to the outer edge, and then the surface of the wafer W is cleaned by a rinse liquid discharged from a rinse nozzle (not shown).
- the example in which the pattern 7 is formed on the wafer W has been described.
- the deposit 10 is easily removed by pretreatment and irradiation with a gas cluster made of carbon dioxide gas. That is, for example, since the source gas used when forming by the CVD method contains an organic substance, when the organic substance adheres to the surface of the wafer W as the adhering substance 10, it is removed as in the example described above.
- the pretreatment is performed in an air atmosphere, but it may be performed in a vacuum atmosphere.
- the processing container 42 for performing the pre-processing and the cleaning processing chamber 21 for performing the cleaning processing may be individually connected to the vacuum transfer chamber 64 shown in FIG.
- the processing container 42 and the cleaning processing chamber 21 may be shared.
- the vacuum transfer chamber 64 is hermetically connected to the cleaning processing chamber 21 that also serves as the processing container 42.
- a gas source 47 in which hydrogen fluoride gas is stored is provided.
- gas supply paths 46 extending from the gas source 47 are provided at a plurality of locations on the ceiling surface of the cleaning processing chamber 21 outside the outer edge of the protruding portion 21a. These are arranged so as to face the center of the wafer W on the mounting table 22.
- the pressure in the cleaning processing chamber 21 is set to a processing pressure for performing the preprocessing, and the wafer W is preprocessed. Then, after the pressure in the cleaning processing chamber 21 is set to be lower than the processing pressure (high vacuum), the above-described cleaning processing is performed.
- a base film 12 made of a germanium (Ge) film is formed on the upper side of the silicon layer 14 of the wafer W as shown in FIG.
- the deposit 10 adheres to the surface of the base film 12.
- the deposit 10 in this case includes a by-product generated when the base film 12 is formed by, for example, a CVD method.
- the following preprocessing is performed.
- ozone gas is supplied to the surface of the base film 12.
- the ozone gas slightly oxidizes the surface layer of the base film 12 by the ozone gas, and a germanium oxide (Ge—O) film 15 is generated as a modified layer.
- a germanium oxide (Ge—O) film 15 is generated as a modified layer.
- the wafer W is irradiated with a gas cluster made of, for example, water vapor (H 2 O)
- the germanium oxide film 15 is dissolved in the water vapor and etched.
- the pretreatment by the oxidation treatment of the base film 12 with the ozone gas and the supply of the water vapor gas cluster brings the deposit 10 into a state of slight contact with the surface of the wafer W as shown in FIG. Becomes extremely weak.
- the gas cluster made of water vapor has no reactivity with the germanium film as the base film 12. Therefore, the germanium oxide film 15 is selectively etched in a state in which damage to the base film 12 is suppressed by the gas cluster made of water vapor.
- the wafer W is irradiated with a gas cluster made of carbon dioxide gas. Since the gas cluster of carbon dioxide gas has no reactivity with the germanium film that is the base film 12, the base film 12 is not damaged, and the germanium oxide dissolved in water vapor together with the base material 12 is not damaged. The film 15 is removed.
- the apparatus for oxidizing the base film 12 of the second embodiment a configuration in which an ozone gas source is connected in place of the vaporizer 43 in the apparatus shown in FIG. 6 is used. Further, as an apparatus for irradiating a gas cluster made of water vapor, a pretreatment chamber having the same configuration as the above-described cleaning treatment chamber 21 is connected to the vacuum transfer chamber 64 in an airtight manner, and vaporization is performed to vaporize pure water as a gas source 37. A vessel is provided.
- the gas supply path 46 for supplying ozone gas to the wafer W and the nozzle 23 for irradiating a gas cluster made of water vapor form a pre-processing mechanism.
- ozone water may be supplied to the wafer W instead of ozone gas using the apparatus shown in FIG.
- a gas cluster of ozone gas when used, it may be configured as follows. That is, as shown in FIG. 17, a gas supply path 34 for irradiating a gas cluster made of carbon dioxide gas, a gas source 37, a vaporizer 38 for vaporizing pure water, and a water vapor supply path 39 extending from the vaporizer 38 are nozzles. 23 may be connected. Therefore, in this example, the generation mechanism for generating the gas cluster in the pretreatment is the same as the generation mechanism for the gas cluster of the cleaning gas. In this case, as described above, after the base film 12 is oxidized, the supply of gas clusters made of water vapor and the supply of gas clusters made of carbon dioxide gas may be performed in this order.
- these gas clusters may be simultaneously supplied to the wafer W to simultaneously perform the etching process of the germanium oxide film 15 and the removal of the deposits 10.
- these gas clusters may be simultaneously supplied to the wafer W to simultaneously perform the etching process of the germanium oxide film 15 and the removal of the deposits 10.
- water vapor as a gas or pure water as a liquid may be supplied to the wafer W.
- pure water is used instead of the hydrogen fluoride aqueous solution or ozone water.
- FIG. 18 an example in which the deposit 10 attached to the photoresist mask 16 for forming the pattern 7 described above on the wafer W is removed is shown. That is, after patterning by performing exposure processing and development processing on the photoresist mask 16, the organic components removed from the photoresist mask 16 by the patterning adhere to the surface of the photoresist mask 16 as the deposit 10. Therefore, the deposit 10 is removed as follows.
- ozone gas is supplied to the surface of the wafer W in place of hydrogen fluoride vapor as a pretreatment.
- the surface of the photoresist mask 16 is slightly oxidized and etched, so that the adhesion of the deposit 10 to the photoresist mask 16 becomes extremely weak. Therefore, when this wafer W is irradiated with a gas cluster made of carbon dioxide gas, the gas cluster has no reactivity with the photoresist mask 16 which is the underlying film 12 on the lower layer side of the surface.
- the modified layer 18 is removed together with the deposit 10.
- ozone water may be supplied to the wafer W instead of ozone gas.
- a gas cluster may be generated using ozone gas, and the surface of the photoresist mask 16 may be oxidized by the gas cluster.
- the ozone gas gas cluster and the carbon dioxide gas gas cluster may be simultaneously supplied to the wafer W, so that the pretreatment and the removal of the deposit 10 may be performed simultaneously.
- the pretreatment may be performed by irradiating with ultraviolet rays (UV) as shown in FIG. 20 instead of supplying ozone gas. .
- UV ultraviolet rays
- the surface of the photoresist mask 16 is hardened due to deterioration and becomes brittle. Therefore, when a gas cluster made of carbon dioxide gas is irradiated onto the photoresist mask 16, the cured layer on the surface of the photoresist mask 16 is removed together with the deposit 10. Therefore, in this example, it can be said that the irradiation process of the gas cluster made of carbon dioxide gas also serves as part of the pretreatment (etching of the surface of the photoresist mask 16). Alternatively, as pretreatment, ozone gas supply and ultraviolet (UV) irradiation may be performed simultaneously.
- pretreatment ozone gas supply and ultraviolet (UV) irradiation may be performed simultaneously.
- the adhesion force of the deposit 10 becomes extremely weak due to the etching of the surface. Therefore, when the wafer W is irradiated with a gas cluster made of carbon dioxide gas, the deposit 10 is easily removed.
- FIG. 21 An apparatus for irradiating the wafer W with ultraviolet rays will be briefly described with reference to FIG.
- a processing container 91 and a mounting table 92 provided in the processing container 91 are arranged.
- a transparent window 93 made of quartz or the like is airtightly attached to the ceiling surface of the processing container 91 at a position facing the mounting table 92.
- an ultraviolet lamp 94 for irradiating the wafer W on the mounting table 92 with ultraviolet rays via the transparent window 93 is provided as a pre-processing mechanism.
- 95 is a gas supply pipe
- 96 is a gas source in which, for example, nitrogen gas is stored
- 97 is a vacuum pump
- 98 is a transfer port.
- the processing container 91 is hermetically connected to the vacuum transfer chamber 64 described above. It should be noted that the processing container 91 for irradiating the wafer W with ultraviolet rays and the processing container 42 in FIG. 6 for supplying ozone gas to the wafer W are used in common, and ultraviolet rays are supplied to the wafer W while ozone gas is supplied. May be irradiated.
- the 4th Embodiment of this invention is described with reference to FIG.22 and FIG.23.
- the metal film 17 is made of, for example, tungsten (W). That is, since the source gas used when the metal film 17 is formed by the CVD method or the like contains an organic substance as described above, a residue made of the organic substance is removed from the metal film 17 as shown in FIG. In some cases, the deposit 10 may adhere to the surface. Therefore, the deposit 10 is removed as follows.
- hydrogen chloride (HCl) gas is supplied to the wafer W as a pretreatment using the apparatus shown in FIG.
- HCl hydrogen chloride
- the surface layer of the metal film 17 is slightly etched and removed. Therefore, the deposit 10 has a very weak adhesion to the metal film 17. Therefore, when the wafer W is irradiated with a gas cluster made of carbon dioxide gas that is not reactive with the metal film 17 as the base film 12, the deposit 10 is easily removed.
- a chlorine fluoride (ClF3) gas may be used as the gas used for the pretreatment instead of the hydrogen chloride gas.
- the metal film 17 may be a titanium film instead of the tungsten film.
- FIG. 24 shows an example where the material constituting the deposit 10 is silicon oxide, and the deposit 10 adheres to, for example, the metal film 17 which is the surface of the wafer W.
- the surface of the deposit 10 is etched by supplying hydrogen fluoride vapor to the wafer W, so that the deposit 10 is on the surface of the wafer W. It will be in a state of just riding. Therefore, the said deposit
- the deposit 10 is silicon oxide
- the deposit 10 is an organic substance
- ozone or ultraviolet rays are supplied (irradiated) to the surface of the wafer W during pre-processing
- a chlorine-based gas is supplied during pretreatment.
- the deposit 10 is silicon
- the surface is pre-oxidized before etching the surface of the deposit 10 as described in the modification of the first embodiment. You may do it.
- the inside of the deposit 10 is not uniformly formed of the same material, if the substance to be etched is included in a part of the deposit 10, the part is etched, so that In addition, the adhesion force of the deposit 10 to the surface of the wafer W can be reduced.
- the surface of the wafer W and the surface of the deposit 10 include the same material, in this example, silicon oxide, the surface of the wafer W is etched together with the surface of the deposit 10. Therefore, the adhesion force of the deposit 10 can be further reduced.
- Carbon dioxide gas was used for the gas cluster irradiated onto the wafer W in the cleaning chamber 21 in each of the examples described above.
- a non-reactive gas that is not reactive with the underlying film 12 of the wafer W such as argon (Ar) gas or nitrogen (N2) gas, is used instead of carbon dioxide gas.
- these gases may be mixed and used.
- the gas cluster made of carbon dioxide gas has a larger size than that of the argon gas or nitrogen gas. Therefore, since the effect of removing the deposit 10 is also increased, it is preferable to generate a gas cluster using this carbon dioxide gas.
- an etching gas having an etching action on the surface of the wafer W or the surface of the deposit 10 may be used together with the non-reactive gas. That is, a gas cluster may be generated by the non-reactive gas and the etching gas, so that the pretreatment (etching treatment) and the deposit 10 removal treatment may be performed simultaneously.
- a plurality of nozzles 23 may be arranged.
- a plurality of nozzles 23 are arranged in a ring shape so as to be concentric with the outer edge of the wafer W, for example, on the upper side of the wafer W.
- an irradiation unit including a plurality of nozzles 23 arranged in a ring shape is arranged over a plurality of circumferences from the center side of the wafer W toward the outer edge.
- a plurality of nozzles 23 are arranged, they may be arranged in a grid pattern above the wafer W.
- the processing apparatus described above a configuration in which an apparatus for preprocessing and an apparatus for irradiating a gas cluster made of carbon dioxide gas are provided.
- these devices are individually arranged as stand-alone devices and the wafer W is transferred between these devices by an external wafer arm.
- the present invention falls within the scope of the right even if the gas cluster irradiated when the deposit 10 is removed is ionized, for example, ionized in a state where the degree of dissociation is weak.
- the surface of the silica particles is etched by the hydrogen fluoride gas cluster as described above, and the adhesion to the wafer is reduced. Therefore, in the examples, the particles were easily removed even when the introduction pressure was lower than in the comparative example.
- gas clusters are generated by using hydrogen fluoride gas together with argon gas. By mixing these gases, pretreatment and cleaning treatment are simultaneously performed. It was found that the gas was quickly removed by the gas cluster of argon gas when was etched. Therefore, even when the pretreatment and the washing treatment are separately performed in this order, it can be seen that the particles are easily removed as in this embodiment.
- W wafer 7 pattern 10 deposit 11 natural oxide film 12 base film 13 oxide film 14 silicon layer 15 germanium oxide film 16 photoresist mask 17 metal film 23 nozzle
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Abstract
Description
付着物が付着した被処理体の表面から付着物を除去する洗浄方法において、
被処理体の表面及び付着物の少なくとも一方に対して、エッチング処理を含む前処理を行う工程と、
被処理体が置かれる処理雰囲気よりも圧力の高い領域から、前記被処理体の表面に露出している膜に対して反応性を持たない洗浄用ガスを処理雰囲気に吐出し、断熱膨張により前記洗浄用ガスの原子または分子の集合体であるガスクラスターを生成させる工程と、
前記前処理が行われた被処理体の表面に、洗浄用ガスのガスクラスターを照射して、付着物を除去する工程と、を含むことを特徴とする。
前記前処理を行う工程と前記付着物を除去する工程とは、同時に行われても良い。
前記前処理は、前記エッチング処理を行うためにガスクラスターを照射する工程を含んでいても良い。
前記洗浄用ガスのガスクラスターを照射して、付着物を除去する工程及び前記エッチング処理を行うためにガスクラスターを照射する工程は、ガスクラスターを照射する生成機構を複数配置して、前記生成機構からガスクラスターを照射する工程であっても良い。
前記洗浄用ガスのガスクラスターを照射して、付着物を除去する工程及び前記エッチング処理を行うためにガスクラスターを照射する工程は、ガスクラスターを照射する生成機構における被処理体に対する角度が可変な状態で行われても良い。
付着物が付着した被処理体の表面から付着物を除去する被処理体の処理装置において、
内部に被処理体が載置される前処理室と、
前記前処理室内に載置された被処理体の表面または付着物の少なくとも一方に対してエッチング処理を含む前処理を行うための前処理機構を有する前処理モジュールと、
内部に被処理体が載置される洗浄処理室と、
前記洗浄処理室に設けられ、前記洗浄処理室の内部の処理雰囲気よりも圧力の高い領域から、前記被処理体の表面に露出している膜に対して反応性を持たない洗浄用ガスを処理雰囲気に吐出して、断熱膨張により前記洗浄用ガスの原子または分子の集合体であるガスクラスターを生成させ、前記付着物を除去するために、前処理後の被処理体に供給するガスクラスターノズルと、
前記前処理室及び前記洗浄処理室に対して被処理体の受け渡しを行う搬送機構と、を備えたことを特徴とする。
前記洗浄処理室は、内部が真空雰囲気に保たれた真空処理室であり、真空雰囲気にて被処理体の搬送を行う真空搬送室に気密に接続され、
前記常圧搬送室と前記真空搬送室との間には、内部の雰囲気の切り替えを行うためのロードロック室が設けられ、
前記常圧搬送室及び前記真空搬送室には、前記搬送機構として常圧搬送機構及び真空搬送機構が夫々設けられていても良い。
前記前処理室及び前記洗浄処理室は、内部が各々真空雰囲気に保たれた真空処理室であり、
前記前処理室及び前記洗浄処理室との間には、前記搬送機構が配置された真空搬送室が気密に介在して設けられていても良い。
前記前処理室及び前記洗浄処理室は、共通化されていても良い。
前記真空搬送室には、前記前処理に先立って行われる真空処理あるいは付着物の除去を行った後に続く真空処理を行うための真空処理室が気密に接続されていても良い。
被処理体の洗浄を行う処理装置に用いられ、コンピュータ上で動作するコンピュータプログラムを格納した記憶媒体であって、
前記コンピュータプログラムは、既述の洗浄方法を実施するようにステップが組まれていることを特徴とする。
本発明の洗浄方法における第1の実施の形態について、図1~図5を参照して説明する。始めに、この洗浄方法が適用されるウエハWの構成及び当該洗浄方法の概略について説明する。このウエハWは、図1に示すように、シリコン(Si)により構成されており、例えば凹部である溝5と凸部であるライン6とからなるパターン7が表面に形成されている。そして、この洗浄方法は、後述するように、前記ライン6の倒れやウエハWの表面の膜荒れといったウエハWに対するダメージの発生を抑制しながら、図2に示すようなウエハW表面の付着物10を容易に除去できるように構成されている。
処理容器42の床面には、当該処理容器42内の雰囲気を排気するための排気口51が例えば複数箇所に形成されており、この排気口51から伸びる排気路52には、バタフライバルブなどの圧力調整部53を介して真空ポンプ54が接続されている。
そして、この処理容器42では、気化器43において蒸発したフッ化水素水溶液の蒸気がキャリアガスにより載置台41上のウエハWに対して供給されると、既述のように自然酸化膜11が溶解する。
続いて、第1の実施の形態の変形例について、図9を参照して説明する。既述の第1の実施の形態では、ウエハWの表面の自然酸化膜11を除去する場合について説明したが、自然酸化膜11は膜厚などの制御が困難であるため、洗浄過程における制御性や再現性が必要である場合には、以下のようにして前処理が行われる。
次いで、本発明の第2の実施の形態について、図13~図16を参照して説明する。この第2の実施の形態では、ウエハWのシリコン層14の上層側には、図13に示すように、ゲルマニウム(Ge)膜からなる下地膜12が形成されている。そして、この下地膜12の表面には、付着物10が付着している。この場合における付着物10は、前記下地膜12を例えばCVD法などにより形成する時に生成する副生成物などを含んでいる。この第2の実施の形態では、以下の前処理が行われる。
次に、本発明の第3の実施の形態について、図18及び図19を参照して説明する。この実施の形態では、図18に示すように、ウエハWに既述のパターン7を形成するためのフォトレジストマスク16に付着した付着物10が除去される例を示している。即ち、フォトレジストマスク16に対して露光処理及び現像処理を行ってパターニングした後には、当該パターニングによりフォトレジストマスク16から除去された有機成分がフォトレジストマスク16の表面に付着物10として付着する。そのため、この付着物10は以下のようにして除去される。
また、フォトレジストマスク16上の付着物10を除去する場合には、前処理としては、オゾンガスの供給に代えて、図20に示すように、紫外線(UV)が照射されるようにしても良い。即ち、紫外線が照射されることによって、フォトレジストマスク16の表面が劣化により硬化して脆くなる。そのため、このフォトレジストマスク16に対して二酸化炭素ガスからなるガスクラスターが照射されると、同様に付着物10と共にフォトレジストマスク16の表面における硬化した層が除去される。従って、この例においては、二酸化炭素ガスからなるガスクラスターの照射工程は、前処理の一部(フォトレジストマスク16の表面のエッチング)を兼ねていると言える。あるいは、前処理として、オゾンガスの供給と紫外線(UV)の照射とが同時に行われるようにしても良い。この場合、既述の例と同様に、表面のエッチングによって付着物10の付着力が極めて弱くなるので、このウエハWに対して二酸化炭素ガスからなるガスクラスターが照射されると、付着物10は容易に除去される。
以下に、本発明の第4の実施の形態について図22及び図23を参照して説明する。この第4の実施の形態では、ウエハWのシリコン層14に積層した金属膜17あるいは既述の溝5内に埋め込んだ金属膜17上の付着物10が除去される例を示している。この例では、金属膜17は、例えばタングステン(W)により構成されている。即ち、金属膜17をCVD法などにより形成する時に用いられるソースガスには、既述のように有機物が含まれているので、図22に示すように、当該有機物からなる残渣が金属膜17の表面に付着物10として付着する場合がある。そこで、以下のようにしてこの付着物10が除去される。
この場合において前処理に用いられるガスとしては、塩化水素ガスに代えて、フッ化塩素(ClF3)ガスを用いても良い。また、金属膜17としては、タングステン膜に代えて、チタン膜であっても良い。
ここで、本発明の第5の実施の形態について述べる。以上の各例では、前処理としてウエハWの表面がエッチングされる例について説明したが、この第5の実施の形態では、ウエハWの表面がエッチングされることに代えて、付着物10の表面がエッチングされる。即ち、付着物10を構成する材質が既知の場合には、あるいは付着物10に含まれている材質の予測が立つ場合には、当該材質がエッチングされると、例えば付着物10の下端部は、ウエハW側から見ると上方側に後退することになる。従って、この場合にも付着物10がウエハWから脱離しやすくなり、同様に二酸化炭素ガスからなるガスクラスターにより当該付着物10が容易に除去される。
また、図26に示すように、ウエハWの表面と付着物10の表面とに同じ材質この例では酸化シリコンが含まれている場合には、付着物10の表面と共にウエハWの表面についてもエッチングできるので、付着物10の付着力を更に低下させることができる。
更に、後述の実施例に示すように、前記非反応性ガスと共に、ウエハWの表面または付着物10の表面に対してエッチング作用を持つエッチングガスを用いても良い。即ち、前記非反応性ガス及び前記エッチングガスによりガスクラスターを発生させ、いわば前処理(エッチング処理)と付着物10の除去処理とが同時に行われるようにしても良い。
また、本発明は、付着物10が除去される時に照射されるガスクラスターがイオン化していても、例えば解離の程度が弱い状態でイオン化していても権利範囲に含まれる。
比較例
ガスクラスターのガス:アルゴンガス100%
ガスクラスターノズルへの導入ガス圧力:0.899MPaG(ゲージ読み値)
実施例
ガスクラスターのガス:アルゴンガス95%+フッ化水素5%
ガスクラスターノズルへの導入ガス圧力:0.85MPaG(ゲージ読み値)
一方、実施例においてガスクラスターの照射前及び照射後におけるSEM写真を図28の左側及び右側に夫々示すと、ガスクラスターの照射後には、ほぼ全ての粒子が除去できていることが分かる。従って、アルゴンガスのガスクラスターだけでは、粒子とウエハとの付着力に打ち勝つことができなかったが、アルゴンガスと共にフッ化水素ガスによりガスクラスターを発生させることにより、前記粒子が容易に除去されることが分かった。
7 パターン
10 付着物
11 自然酸化膜
12 下地膜
13 酸化膜
14 シリコン層
15 酸化ゲルマニウム膜
16 フォトレジストマスク
17 金属膜
23 ノズル
Claims (16)
- 付着物が付着した被処理体の表面から付着物を除去する洗浄方法において、
被処理体の表面及び付着物の少なくとも一方に対して、エッチング処理を含む前処理を行う工程と、
被処理体が置かれる処理雰囲気よりも圧力の高い領域から、前記被処理体の表面に露出している膜に対して反応性を持たない洗浄用ガスを処理雰囲気に吐出し、断熱膨張により前記洗浄用ガスの原子または分子の集合体であるガスクラスターを生成させる工程と、
前記前処理が行われた被処理体の表面に、洗浄用ガスのガスクラスターを照射して、付着物を除去する工程と、を含むことを特徴とする洗浄方法。 - 前記前処理は、被処理体の表面及び付着物の少なくとも一方に対する改質処理と、前記改質処理により改質された改質層に対するエッチング処理とを含むことを特徴とする請求項1に記載の洗浄方法。
- 前記前処理を行う工程と前記付着物を除去する工程とは、同時に行われることを特徴とする請求項1に記載の洗浄方法。
- 前記前処理は、前記エッチング処理を行うためにガスクラスターを照射する工程を含むことを特徴とする請求項1に記載の洗浄方法。
- 前記エッチング処理を行うためにガスクラスターを照射する工程は、前記洗浄用ガスのガスクラスターを照射して、付着物を除去する工程においてガスクラスターを照射する生成機構と同一の生成機構を用いて照射する工程であることを特徴とする請求項4に記載の洗浄方法。
- 前記エッチング処理を行うためにガスクラスターを照射する工程は、前記洗浄用ガスのガスクラスターを照射して、付着物を除去する工程においてガスクラスターを照射する生成機構とは異なる生成機構を用いて照射する工程であることを特徴とする請求項4に記載の洗浄方法。
- 前記洗浄用ガスのガスクラスターを照射して、付着物を除去する工程は、ガスクラスターを照射する生成機構を複数配置して、前記生成機構からガスクラスターを照射する工程であることを特徴とする請求項1に記載の洗浄方法。
- 前記エッチング処理を行うためにガスクラスターを照射する工程は、ガスクラスターを照射する生成機構を複数配置して、前記生成機構からガスクラスターを照射する工程であることを特徴とする請求項4に記載の洗浄方法。
- 前記洗浄用ガスのガスクラスターを照射して、付着物を除去する工程は、ガスクラスターを照射する生成機構における被処理体に対する角度が可変な状態で行われることを特徴とする請求項1に記載の洗浄方法。
- 前記エッチング処理を行うためにガスクラスターを照射する工程は、ガスクラスターを照射する生成機構における被処理体に対する角度が可変な状態で行われることを特徴とする請求項4に記載の洗浄方法。
- 付着物が付着した被処理体の表面から付着物を除去する被処理体の処理装置において、
内部に被処理体が載置される前処理室と、
前記前処理室内に載置された被処理体の表面または付着物の少なくとも一方に対してエッチング処理を含む前処理を行うための前処理機構を有する前処理モジュールと、
内部に被処理体が載置される洗浄処理室と、
前記洗浄処理室に設けられ、前記洗浄処理室の内部の処理雰囲気よりも圧力の高い領域から、前記被処理体の表面に露出している膜に対して反応性を持たない洗浄用ガスを処理雰囲気に吐出して、断熱膨張により前記洗浄用ガスの原子または分子の集合体であるガスクラスターを生成させ、前記付着物を除去するために、前処理後の被処理体に供給するガスクラスターノズルと、
前記前処理室及び前記洗浄処理室に対して被処理体の受け渡しを行う搬送機構と、を備えたことを特徴とする処理装置。 - 前記前処理室は、内部が常圧雰囲気に保たれた常圧処理室であり、常圧雰囲気にて被処理体の搬送を行う常圧搬送室に接続され、
前記洗浄処理室は、内部が真空雰囲気に保たれた真空処理室であり、真空雰囲気にて被処理体の搬送を行う真空搬送室に気密に接続され、
前記常圧搬送室と前記真空搬送室との間には、内部の雰囲気の切り替えを行うためのロードロック室が設けられ、
前記常圧搬送室及び前記真空搬送室には、前記搬送機構として常圧搬送機構及び真空搬送機構が夫々設けられていることを特徴とする請求項11に記載の処理装置。 - 前記前処理室及び前記洗浄処理室は、内部が各々真空雰囲気に保たれた真空処理室であり、
前記前処理室及び前記洗浄処理室との間には、前記搬送機構が配置された真空搬送室が気密に介在して設けられていることを特徴とする請求項11に記載の処理装置。 - 前記前処理室及び前記洗浄処理室は、共通化されていることを特徴とする請求項11に記載の処理装置。
- 前記真空搬送室には、前記前処理に先立って行われる真空処理あるいは付着物の除去を行った後に続く真空処理を行うための真空処理室が気密に接続されていることを特徴とする請求項12に記載の処理装置。
- 被処理体の洗浄を行う処理装置に用いられ、コンピュータ上で動作するコンピュータプログラムを格納した記憶媒体であって、
前記コンピュータプログラムは、請求項1に記載の洗浄方法を実施するようにステップが組まれていることを特徴とする記憶媒体。
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JP5776397B2 (ja) | 2015-09-09 |
KR101672833B1 (ko) | 2016-11-04 |
TW201330139A (zh) | 2013-07-16 |
US20140227882A1 (en) | 2014-08-14 |
TWI540658B (zh) | 2016-07-01 |
US9837260B2 (en) | 2017-12-05 |
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