WO2017029771A1 - スパッタリング装置及びその状態判別方法 - Google Patents
スパッタリング装置及びその状態判別方法 Download PDFInfo
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- WO2017029771A1 WO2017029771A1 PCT/JP2016/002814 JP2016002814W WO2017029771A1 WO 2017029771 A1 WO2017029771 A1 WO 2017029771A1 JP 2016002814 W JP2016002814 W JP 2016002814W WO 2017029771 A1 WO2017029771 A1 WO 2017029771A1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
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- C—CHEMISTRY; METALLURGY
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/08—Oxides
- C23C14/081—Oxides of aluminium, magnesium or beryllium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/35—Sputtering by application of a magnetic field, e.g. magnetron sputtering
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/52—Means for observation of the coating process
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/54—Controlling or regulating the coating process
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/56—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks
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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
- H01J37/32431—Constructional details of the reactor
- H01J37/32798—Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
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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
- H01J37/32431—Constructional details of the reactor
- H01J37/32798—Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
- H01J37/32816—Pressure
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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
- H01J37/34—Gas-filled discharge tubes operating with cathodic sputtering
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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
- H01J37/34—Gas-filled discharge tubes operating with cathodic sputtering
- H01J37/3411—Constructional aspects of the reactor
- H01J37/3435—Target holders (includes backing plates and endblocks)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
Definitions
- the present invention relates to a sputtering apparatus and a state determination method thereof.
- a vacuum chamber in which a target is detachably attached, a stage that is disposed to face the target in the vacuum chamber and holds the substrate, and the target and the substrate face each other are isolated from the inside of the vacuum chamber.
- the isolation means is generally configured by assembling an isolation block and a plurality of isolation plates in consideration of maintainability, transport of the substrate to the stage, etc., and through the gap between the isolation blocks and the isolation plates.
- the inside of the vacuum chamber communicates with the inside of the isolation space, and the isolation space is evacuated as the vacuum inside the vacuum chamber is evacuated.
- the isolation block and the isolation plate are assembled, the gap is set in a range of 2 to 3 mm so that plasma does not leak through the gap between the isolation plates when high frequency power is applied to the target.
- the atmosphere in the vacuum chamber is suitable for film formation prior to film formation on the substrate.
- an isolation space separated from the vacuum chamber is provided in the vacuum chamber so that the target and the substrate face by the isolation means. Using a vacuum chamber that is evacuated as it is pulled, the vacuum chamber is evacuated to a preset pressure, gas is introduced in this state, and the pressure in the isolated space at this time is acquired.
- the pressure in the isolation space obtained in advance when the film is formed with a predetermined film thickness / film surface distribution is used as a reference pressure, and the reference pressure and the acquisition are obtained. It was by comparing the pressure in the isolated space, characterized in that it comprises a first determination step of determining the state of the sputtering apparatus.
- the present invention it is possible to reliably determine whether or not the atmosphere in the vacuum chamber is suitable for film formation by acquiring the pressure in the isolation space and comparing the acquired pressure with a reference pressure. For example, when the isolation means is not assembled at a predetermined position and the pressure in the isolation space measured after the isolation means is changed significantly compared to before replacement (reference pressure), the film thickness or The in-plane distribution of film quality may change, and it is determined that the film quality is not suitable for film formation. In this case, it is possible to confirm the assembly position of the isolation means before performing dummy sputtering and film formation, which is advantageous in that the maintenance time of the sputtering apparatus can be shortened.
- a second determination step of measuring a pressure outside the isolation space in the vacuum chamber and determining a state of the sputtering apparatus from a pressure difference between the measured pressure and the acquired pressure in the isolation space is preferable to include. According to this, before performing dummy sputtering and film formation, it is advantageous that an abnormal position of the isolation means can be confirmed from the pressure difference between the isolation space and the isolation space.
- the method further includes a third determination step of measuring a change amount of the pressure in the isolated space per unit time when the gas is introduced, and determining a state of the sputtering apparatus from the measured change amount.
- a third determination step of measuring a change amount of the pressure in the isolated space per unit time when the gas is introduced, and determining a state of the sputtering apparatus from the measured change amount.
- the amount of change in pressure outside the isolation space in the vacuum chamber per unit time when the gas is introduced is measured, and the fourth determination for determining the state of the sputtering apparatus from the measured change It is preferable to further include a step. According to this, when the acquired pressure in the isolated space is equal to the reference pressure, and the amount of change in the pressure outside the isolated space in the vacuum chamber is large, the exhaust means of the sputtering apparatus is deteriorated. It is advantageous that the maintenance can be performed at an appropriate time.
- a vacuum chamber in which a target is detachably attached, a stage that is placed opposite to the target in the vacuum chamber to hold the substrate, and the target and the substrate face each other are separated from the inside of the vacuum chamber.
- the isolation means is disposed around the stage.
- the ground isolation ground has an annular isolation block and an isolation plate that surrounds the isolation block and the target and surrounds the space between the target and the stage, and the isolation block is thick with the tip facing the isolation space.
- At least one through-hole penetrating in the direction is provided, and a vacuum gauge for measuring the pressure in the isolated space is provided through the through-hole.
- the pressure in the isolation space is measured through the through hole of the isolation block, it is possible to prevent the sputtered particles from being deposited on the gauge probe. Therefore, by using the sputtering apparatus of the present invention, the pressure in the isolated space can be measured, so that it can be reliably determined whether or not the atmosphere in the vacuum chamber is suitable for film formation.
- the isolation block has a plurality of the through holes, a bent portion is formed in any of these through holes, and the vacuum gauge is provided through the bent portion. According to this, since it is possible to further prevent the sputtered particles having straightness from adhering to the probe of the vacuum gauge to form a film, it is possible to more reliably determine whether the atmosphere in the vacuum chamber is suitable for film formation. Can be determined.
- SM is a sputtering apparatus according to an embodiment of the present invention.
- the sputtering apparatus SM includes a vacuum chamber 1, and a cathode unit C is detachably attached to a ceiling portion of the vacuum chamber 1.
- the direction facing the ceiling portion side of the vacuum chamber 1 is referred to as “up” and the direction facing the bottom portion side is described as “down”.
- the cathode unit C includes a target 2, a backing plate 3, and a magnet unit 4.
- the target 2 is made of an insulator such as alumina that is appropriately selected according to the composition of the thin film to be formed on the substrate W, and is formed in a circular shape in plan view by a known method according to the contour of the substrate W. .
- the backing plate 3 is bonded to the upper surface of the target 2 facing away from the sputtering surface 2a via a bonding material such as indium or tin (not shown), and is bonded to the target 2 via an insulator I1. Attached to the upper part of the vacuum chamber 1.
- a refrigerant circulation passage (not shown) is opened inside the backing plate 3, and the target 2 can be cooled during film formation by circulating the refrigerant through the refrigerant circulation passage.
- the target 2 is connected to a high-frequency power source E having a known structure, and high-frequency (alternating current) power of a predetermined frequency (for example, 13.56 MHz) is supplied between the target 2 and the ground during sputtering.
- the magnet unit 4 generates a magnetic field in a space below the sputter surface 2a of the target 2, captures electrons etc. ionized below the sputter surface 2a during sputtering, and efficiently ionizes sputtered particles scattered from the target 2. Since it has a closed magnetic field or cusp magnetic field structure, detailed description is omitted here.
- a stage 5 is arranged in the center of the bottom of the vacuum chamber 1 so as to face the target 2.
- the stage 5 includes a metal base 51 having a cylindrical outline, for example, and a chuck plate 52 bonded to the upper surface of the base 51.
- the chuck plate 52 has an outer diameter that is slightly smaller than the upper surface of the base 51, and is embedded with electrodes 52a and 52b for electrostatic chuck, so that a voltage is applied from a chuck power source (not shown).
- the chuck plate 52 is detachably attached to the upper surface of the base 51 by a ring-shaped deposition plate 53.
- the adhesion prevention board 53 is attached to the upper surface of the base 51 via the insulator I2.
- the base 51 is held by an insulator I3 that is airtightly attached to an opening provided on the bottom surface of the vacuum chamber 1, and is separated from the grounded vacuum chamber 1 and is electrically floating.
- insulator I3 There is no restriction
- the sputtering apparatus SM includes an annular grounded isolation block 6, a plurality of isolation plates 71, as isolation means for defining an isolation space 1 a that is isolated from the vacuum chamber 1 where the target 2 and the substrate W face. 72, 73.
- the isolation block 6 is disposed on the bottom surface of the vacuum chamber 1 around the stage 5 and is formed so as to incline downward radially outward from the inner peripheral edge thereof.
- the isolation plates 71, 72, 73 are arranged vertically so as to surround the isolation block 6 and the target 2 and to surround the space between the target 2 and the stage 5.
- the isolation block 6 and the isolation plates 71, 72, and 73 also serve as an adhesion prevention plate that prevents adhesion of sputtered particles to the inner wall surface of the vacuum chamber 1.
- a drive shaft Cr of a cylinder Cy provided through the bottom surface of the vacuum chamber 1 is connected to the outer side surface of the isolation plate 72, and the cylinder Cy provides the downward movement position shown in FIG. 1 and the isolation plate 71 side. It can move between the up and down positions.
- a gap is formed between the isolation plate 72 and the isolation plate 73, and the substrate to the stage 5 through the through hole To for opening and closing by a gate valve (not shown). W can be carried out and carried in.
- the gap d is 2 to 2 so that plasma does not leak through the gap d between the isolation plates 71, 72, 73 when high frequency power is applied to the target 2.
- the range is set to 3 mm.
- a gas pipe 8 is connected to the side wall of the vacuum chamber 1 as gas introducing means for introducing sputtering gas into the isolation space 1a, and the gas pipe 8 communicates with a gas source (not shown) via the mass flow controller 8a.
- the sputtering gas includes not only a rare gas such as argon gas introduced when forming plasma in the isolation space 1a but also a reactive gas such as oxygen gas or nitrogen gas.
- an exhaust pipe 9 communicating with an exhaust means P constituted by a turbo molecular pump, a rotary pump, or the like is connected to the side surface of the vacuum chamber 1 and is isolated by evacuating the vacuum chamber 1 at a constant speed by the exhaust means P.
- the space 1a can be evacuated.
- the sputtering apparatus SM has a known control means Cu equipped with a microcomputer, a sequencer and the like, and not only performs the state determination method described later, but also operates the mass flow controller 8a, the exhaust means P, and the high frequency power supply E.
- the operation of the cylinder, the operation of the cylinder Cy, and the like are controlled in an integrated manner.
- a sputtering method using the sputtering apparatus SM will be described by taking an example in which an alumina film is formed.
- the separation plate 72 is moved to the upward movement position by the cylinder Cy, and the substrate W is transferred onto the stage 5 through the through hole To using a transfer robot (not shown), and a predetermined voltage is applied to the electrodes 52a and 52b for the electrostatic chuck. This is applied to electrostatically attract the substrate W.
- the isolation plate 72 is moved to the lower position by the cylinder Cy, and argon gas as a sputter gas is introduced into the isolation space 1a from the introduction port 8b of the gas pipe 8 at a predetermined flow rate.
- a predetermined high-frequency power (for example, 13.56 MHz, 1 to 5 kW) is input from the high-frequency power source E.
- plasma is formed in the isolated space 1a, and the sputtered particles 2a sputtered and scattered from the target 2 adhere to and deposit on the substrate W to form an insulating film such as an alumina film.
- the isolation plates 71, 72, 73 are Replaced regularly.
- the isolation plates 71, 72, 73 are not assembled so that the gap d is maintained, the pressure in the isolation space 1a during the film formation restarted after replacement, and thus the plasma density, changes, and the film thickness and The in-plane distribution of film quality will change.
- the isolation block 6 is provided with a plurality of through-holes 61 whose end faces the isolation space 1a and penetrates in the thickness direction, and a bent portion 62 is formed in any one of these through-holes 61.
- a through hole 1b communicating with the through hole 61 in which the bent portion 62 was formed was opened in the bottom wall of the vacuum chamber 1, and the flange 11b of the vacuum gauge 11 was attached to the through hole 1b in an airtight manner. With this vacuum gauge 11, the pressure in the isolated space 1 a can be measured via the bent portion 62.
- the method for determining the state of the sputtering apparatus SM will be described by taking as an example a case where the method is performed after the separation plates 71, 72, 73 are replaced.
- the vacuum chamber 1 is evacuated by the vacuum pump P to evacuate the isolation space 1 a.
- a predetermined pressure (1 ⁇ 10 ⁇ 4 Torr) for example, 200 sccm of argon gas is introduced from the gas pipe 8.
- a pressure difference corresponding to the gap (conductance) d is generated between the two. That is, the pressure in the isolated space 1a with respect to the argon gas flow rate varies depending on the gap d.
- the gap d When the gap d is smaller than a predetermined value (design value) due to poor assembly of the isolation plates 71, 72, 73, the pressure in the isolation space 1a is increased, while the gap d is larger than the predetermined value. In this case, the pressure in the isolation space 1a becomes low.
- the gap d changes in this way, the pressure in the isolation space 1a during film formation, and thus the plasma density, changes, and it becomes impossible to form a film with good in-plane distribution of film thickness and film quality.
- the control means Cu acquires the pressure in the isolation space 1a (hereinafter also referred to as “measurement pressure”) measured by the vacuum gauge 11 after a predetermined time from the start of the introduction of the argon gas. Further, the pressure in the isolation space 1a when the film is formed with a predetermined (good) film thickness / film quality in-plane distribution is obtained in advance as a reference pressure. Then, the obtained measurement pressure is compared with the pressure (reference pressure) when the film can be formed with a good film thickness / in-plane distribution obtained in advance.
- measurement pressure the pressure in the isolation space 1a
- the measurement pressure is equal to the reference pressure (the difference between the two is within a predetermined range)
- the atmosphere in the vacuum chamber 1 that is, the atmosphere in the isolation space 1a is in a state suitable for film formation (first). Discriminating step). In this case, after performing a known dummy sputtering, it returns to said film-forming.
- the difference between the measurement pressure and the reference pressure exceeds a predetermined range, it is determined that the atmosphere in the isolation space 1a is not suitable for film formation. In this case, maintenance such as confirming assembly of the isolation plates 71, 72, 73 is performed without performing dummy sputtering.
- an abnormality that the film can not be formed with good in-plane distribution of film thickness and film quality due to poor assembly of the isolation plates 71, 72, 73 is detected at the time of film formation after dummy sputtering, and it takes a long time to complete maintenance. It can be prevented. Therefore, since maintenance can be performed before dummy sputtering, the maintenance time can be shortened, which is advantageous.
- the present invention is not limited to the above.
- the case where the three separation plates 71, 72, 73 are provided has been described.
- the number of the separation plates is not limited to this, and a plurality of separation plates may be provided so that there is a gap d between the separation plates.
- a through hole 1c is provided in the side wall of the vacuum chamber 1, and a second vacuum gauge 12 leading to the through hole 1c is provided so that the pressure outside the isolation space 1a in the vacuum chamber 1 can be measured.
- You may comprise.
- the pressure outside the isolation space 1a in the vacuum chamber 1 with respect to the argon gas flow rate is also measured, and the state of the sputtering apparatus SM may be determined from the pressure difference between the measured pressure and the pressure in the isolation space 1a ( Second discrimination step).
- the pressure in the isolation space 1a is equal to the pressure measured last time (that is, the measurement pressure and the reference pressure are equal)
- the pressure outside the isolation space 1a in the vacuum chamber 1 is higher than the pressure measured last time. If it is high, the pressure difference becomes large. For example, it is determined that the exhaust means P of the sputtering apparatus SM has deteriorated, and maintenance can be performed at an appropriate time, which is advantageous.
- the amount of change in pressure in the isolated space 1a per unit time during introduction of the sputtering gas and the amount of change in pressure outside the isolated space 1a in the vacuum chamber 1 are measured, and the sputtering apparatus is determined from the measured amount of change. May be determined (third and fourth determination steps).
- the isolation plates 71, 72, 73 are not assembled so that the gap d is maintained, the conductance between the isolation space 1a and the isolation space 1a outside changes. For this reason, abnormality of the assembly position of the isolation plates 71, 72, 73 can be confirmed from these pressure changes.
- the case where the pressure in the isolation space 1a is measured by the vacuum gauge 11 through the bent portion 62 has been described as an example.
- the sputter particles adhere to the inner wall of the through hole 61 of the isolation block 6 and the vacuum gauge 11 When the sputtered particles do not reach, it is not necessary to form the bent portion 62 in the through hole 61.
- the pressure in the isolated space 1a is measured through the through hole 61.
- the isolation block 6 is provided with a plurality of through holes 61, but the plurality of through holes 61 are not necessarily provided, and one through hole 61 communicating with the vacuum gauge 11 is provided. That's fine.
- the isolation plates 71, 72, 73 are assembled at appropriate positions (at this time, the gap d is 3 mm), and this state is defined as a first state.
- the vacuum chamber 1 is evacuated to evacuate the isolation space 1a to 1 ⁇ 10 ⁇ 4 Torr, and then 200 sccm of argon gas is introduced. 1.
- this state is set as the second state.
- 200 sccm of argon gas is introduced in the same manner as in the first state, and the pressure in the isolation space 1a and the pressure in the vacuum chamber 1 after a predetermined time (5 sec) from the start of introduction are measured with the vacuum gauge 11 , 12 were 2.4 ⁇ 10 ⁇ 2 Torr and 1.4 ⁇ 10 ⁇ 2 Torr (the pressure difference at this time was 1 ⁇ 10 ⁇ 2 Torr).
- an alumina film was formed on the surface of the silicon substrate W, and the film thickness in-plane distribution was measured.
- the pressure in the vacuum chamber 1 was the same in the first state and the second state, but the pressure in the isolation space 1a was different by about 3 mTorr. Further, it was confirmed that when the gap d changes, the pressure in the isolation space 1a changes and the in-plane distribution of the film thickness changes. Therefore, it was found that by measuring the pressure in the isolated space 1a with the vacuum gauge 11, it can be determined whether or not the atmosphere in the vacuum chamber 1 and the isolated space 1a is in a state suitable for film formation. It has also been found that the pressure can be determined from the pressure difference between the pressure in the isolated space 1 a and the pressure outside the isolated space 1 a in the vacuum chamber 1.
- SM Sputtering apparatus, W ... Substrate, 1 ... Vacuum chamber, 1a ... Isolation space, 2 ... Target, 5 ... Stage, 6 ... Isolation block (isolation means), 61 ... Through-hole, 62 ... Bent part, 71, 72, 73 ... isolation plate (isolation means), 11 ... vacuum gauge.
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Abstract
Description
Claims (6)
- ターゲットをスパッタリングしてこのターゲットに対向配置される基板に成膜するスパッタリング装置にて、基板への成膜に先立って真空チャンバ内の雰囲気が成膜に適した状態かを判別するスパッタリング装置の状態判別方法であって、
スパッタリング装置として、隔絶手段によってターゲットと基板とが臨む、真空チャンバ内と隔絶された隔絶空間を真空チャンバ内に設け、真空チャンバ内の真空引きに伴って隔絶空間が真空引きされるようにしたものを用い、
真空チャンバ内を予め設定された圧力まで真空引きし、この状態でガスを導入し、このときの隔絶空間内の圧力を取得し、所定の膜厚・膜質面内分布で成膜したときに予め求めた前記隔絶空間内の圧力を基準圧力とし、この基準圧力と前記取得した隔絶空間内の圧力とを比較してスパッタリング装置の状態を判別する第1の判別工程を含むことを特徴とするスパッタリング装置の状態判別方法。 - 真空チャンバ内の前記隔絶空間の外側の圧力を測定し、この測定した圧力と前記取得した隔絶空間内の圧力との圧力差からスパッタリング装置の状態を判別する第2の判別工程を更に含むことを特徴とする請求項1記載のスパッタリング装置の状態判別方法。
- 前記ガスを導入したときの単位時間当たりの前記隔絶空間内の圧力の変化量を測定し、この測定した変化量からスパッタリング装置の状態を判別する第3の判別工程を更に含むことを特徴とする請求項1または請求項2記載のスパッタリング装置の状態判別方法。
- 前記ガスを導入したときの単位時間当たりの真空チャンバ内の前記隔絶空間の外側の圧力の変化量を測定し、この測定した変化量からスパッタリング装置の状態を判別する第4の判別工程を更に含むことを特徴とする請求項1~3の何れか1項記載のスパッタリング装置の状態判別方法。
- ターゲットが着脱自在に取り付けられる真空チャンバと、真空チャンバ内でターゲットと対向配置されて基板を保持するステージと、ターゲットと基板とが臨む、真空チャンバ内から隔絶された隔絶空間を画成する隔絶手段と、真空チャンバ内を真空引きすることで隔絶空間内を真空引きする排気手段とを備えるスパッタリング装置であって、
隔絶手段は、ステージの周囲に配置されるアース接地で環状の隔絶ブロックと、隔絶ブロックとターゲットとの周囲を囲ってターゲットとステージとの間の空間を囲繞する隔絶板とを有するものにおいて、
隔絶ブロックに、先端が隔絶空間を臨み厚さ方向に貫通する少なくとも1つの貫通孔を設け、この貫通孔を通して隔絶空間内の圧力を測定する真空計を設けたことを特徴とするスパッタリング装置。 - 前記隔絶ブロックは前記貫通孔を複数有し、これらの貫通孔のいずれかに屈曲部分を形成し、この屈曲部分を通して前記真空計を設けたことを特徴とする請求項5記載のスパッタリング装置。
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