WO2007007731A1 - 基板の異物除去装置及び基板の異物除去方法 - Google Patents
基板の異物除去装置及び基板の異物除去方法 Download PDFInfo
- Publication number
- WO2007007731A1 WO2007007731A1 PCT/JP2006/313721 JP2006313721W WO2007007731A1 WO 2007007731 A1 WO2007007731 A1 WO 2007007731A1 JP 2006313721 W JP2006313721 W JP 2006313721W WO 2007007731 A1 WO2007007731 A1 WO 2007007731A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- substrate
- electrostatic chuck
- resin sheet
- foreign matter
- electrode
- Prior art date
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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
- H01L21/04—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
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B6/00—Cleaning by electrostatic means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0014—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by incorporation in a layer which is removed with the contaminants
-
- 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
- H01L21/02096—Cleaning only mechanical cleaning
-
- 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
- H01L21/67132—Apparatus for placing on an insulating substrate, e.g. tape
-
- 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
- H01L21/683—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 for supporting or gripping
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N13/00—Clutches or holding devices using electrostatic attraction, e.g. using Johnson-Rahbek effect
Definitions
- the present invention relates to a technique for removing foreign substances adhering to a substrate formed of silicon or a compound used in a semiconductor element manufacturing process, a substrate formed of glass or resin used in a flat panel display or the like. About.
- a wafer before manufacturing a semiconductor element or the like is subjected to some cleaning treatment.
- foreign matter detached in a cleaning tank for cleaning the wafer adheres to another wafer and is contaminated with foreign matter.
- the foreign material is metallic, if the semiconductor bonding region or the like is contaminated by the metallic foreign material, the junction potential fluctuates, and the characteristics of the element deviate from the design value. The malfunction of the integrated circuit will occur.
- the allowable particle guideline for the wafer back surface in 2006 was a 300 mm diameter wafer with a particle size of 0.12. ⁇ It is mentioned that the number of particles per m, wafer is 400. Regarding the particles on the surface, the critical particle size is 35nm and the number of particles is 64. Further, it is desirable that the metal foreign matter in the gate oxide of the MOS transistor is 0.5 X 10 1 C) atmZcm 2 or less.
- An RCA cleaning method is generally known as a method for removing foreign substances adhering to a wafer. This is one of the processes called wet cleaning. Particle removal is performed using a mixed solution of aqueous ammonia and hydrogen peroxide water, and metal ions are removed using a mixed solution of hydrochloric acid and hydrogen peroxide. This is a combination of these two processes.
- a process called dry cleaning is also known. For example, there is a method in which an adhesive tape is applied to remove a foreign substance adhering to the back surface (substrate adsorbing surface side) of a semiconductor wafer, and then this is peeled off. It has been proposed (see Patent Documents 1 and 2).
- Patent Document 3 a method of removing a foreign substance attached to the back surface of the wafer by radicals in the plasma by bringing plasma into contact with the wafer
- Patent Document 5 a method of removing foreign substances by blowing an inert gas from a predetermined direction on the surface of the wafer
- Patent Document 6 a method of removing foreign matters by jetting a jet water stream that is pure hydropower
- the wet cleaning described above is performed in the cleaning liquid.
- the preparation of the cleaning liquid and the disposal of the waste liquid are very expensive, which is undesirable from today's environmental protection considerations.
- the wafer may be damaged by the force applied to the wafer when the tape is peeled off.
- the terminal cost per wafer has increased due to the recent increase in wafer diameter (approximately several million to 10 million yen). It is a high technique.
- the plasma treatment or the method of spraying inert gas may cause foreign particles that have been scattered once to reattach, or cause new foreign materials to adhere during processing.
- Patent Document 7 Japanese Patent Laid-Open No. 6-232108
- Patent Document 2 Japanese Patent No. 3534847
- Patent Document 3 JP-A-6-120175
- Patent Document 4 JP-A-7-94462
- Patent Document 5 JP-A-8-222538
- Patent Document 6 Japanese Patent Laid-Open No. 11-102849
- Patent Document 7 Japanese Unexamined Patent Application Publication No. 2006-32876
- the present inventors can remove the foreign matter reliably by eliminating the possibility of the reattachment of the foreign matter, and can prevent the possibility of the substrate damage as much as possible even with a large-diameter substrate.
- the removal means the substrate to be processed is adsorbed to the electrostatic chuck via the resin sheet, and the foreign matter adhering to the substrate is transferred to the resin sheet to remove the problem.
- the object of the present invention is to reliably remove foreign matters adhering to the substrate and eliminate the possibility of re-adhesion, and to reliably prevent damage to the substrate even for a large substrate. It is an object of the present invention to provide a substrate foreign matter removing apparatus capable of removing foreign matter.
- Another object of the present invention is to reliably remove foreign substances adhering to the substrate and eliminate the possibility of re-adhesion, and can be applied to a large substrate without fear of substrate damage. It is to provide a foreign matter removing method.
- the present invention is a foreign matter removing apparatus that removes foreign matter adhering to a substrate, and includes an electrostatic chuck that forms a substrate attracting surface that attracts the substrate, and a resin that supplies a resin sheet to the substrate attracting surface.
- the substrate supplied to the electrostatic chuck by the substrate transfer means And removing the foreign matter adhering to the substrate suction surface side of the substrate by transferring it to the resin sheet.
- the present invention is a foreign matter removing method for removing foreign matter adhering to a substrate, wherein the substrate is supplied to an electrostatic chuck that forms a substrate suction surface for adsorbing the substrate, and the substrate is interposed via a resin sheet.
- a substrate foreign matter removing method wherein a substrate is adsorbed on a plate adsorption surface, and the foreign matter adhering to the substrate adsorption surface side of the substrate is transferred to a resin sheet and removed.
- the substrate from which foreign matter is removed is not particularly limited.
- Various substrates processed in the manufacture of semiconductor devices, flat panel displays, and the like are targeted, for example, silicon wafers, GaAs, SiC Examples include semiconductor substrates such as glass substrates, resin substrates, and organic EL substrates.
- semiconductor substrates such as glass substrates, resin substrates, and organic EL substrates.
- the foreign matter to be removed is a thing that needs to be removed from the substrate strength in various manufacturing processes and the like, for example, particles, dust, resist deposits, products in the chamber, etc. As an example.
- an electrostatic chuck that forms a substrate attracting surface includes a central electrostatic chuck 2 that attracts at least the central portion of the substrate 1, and the periphery of the substrate.
- An example of the foreign matter removing apparatus is that it is divided into the peripheral electrostatic chuck 3 that attracts the portion.
- one substrate suction surface 4 is formed by a plurality of electrostatic chucks having at least a central electrostatic chuck 2 and a peripheral electrostatic chuck 3, and this substrate is passed through the resin sheet supplied by the resin sheet supply means.
- the substrate 1 is adsorbed on the adsorption surface 4 and the foreign matter adhering to the substrate adsorption surface side of the substrate 1 is removed.
- the central electrostatic chuck 2 corresponds to at least the central portion of the substrate, and the peripheral electrostatic chuck 3 only needs to be capable of adsorbing one substrate corresponding to the peripheral portion of the substrate.
- peripheral electrostatic chucks may be arranged on both sides of the central electrostatic chuck.
- the shapes thereof are not limited to those shown in FIGS. 1 and 2, and can be appropriately designed according to the size and shape of the substrate to be adsorbed. It can be made of other shapes!
- the foreign matter removing device moves the central electrostatic chuck in the direction perpendicular to the substrate attracting surface.
- a height direction adjusting means capable of forming a predetermined gap between the end of the substrate and the resin sheet.
- a substrate attracting surface is formed by a plurality of electrostatic chucks, and at least a part of these electrostatic chucks can be moved up and down to facilitate mounting and recovery of the substrate. That is, after removing the foreign matter by adsorbing the substrate to the substrate adsorption surface, the height of the central electrostatic chuck is relatively increased by the height direction adjusting means, and between the edge of the substrate and the resin sheet.
- the predetermined gap formed between the edge of the substrate and the resin sheet may be a gap that allows the substrate to be collected by a substrate transfer means as described later.
- the height direction adjusting means corresponds to a peripheral chuck lifting mechanism and a peripheral electrostatic chuck that can lower the peripheral electrostatic chuck vertically downward from the substrate suction surface.
- the height position of at least a part of the resin sheet is lower than the substrate adsorption surface.
- a resin sheet height adjustment mechanism that can be adjusted so that the central electrostatic chuck protrudes relatively, and a predetermined gap is provided between the end of the substrate and the resin sheet. It is good to make it form.
- the central electrostatic chuck can be raised from the substrate suction surface to the vertical improvement side so that the central electrostatic chuck protrudes relative to the end of the substrate.
- a predetermined gap may be formed between the resin sheet and the resin sheet.
- the peripheral chuck lifting mechanism and the central chuck lifting mechanism are not particularly limited as long as each electrostatic chuck can be lifted and lowered, for example, an air cylinder, solenoid, motor driven ball screw and nut, etc. It is only necessary to be able to move up and down by connecting to.
- a guide roller connected to the lifting mechanism as described above may be provided.
- the vertical direction with respect to the substrate suction surface means that the substrate side is the upper side and the opposite side is the lower side with the substrate suction surface as a reference.
- the foreign matter removing apparatus of the present invention includes a substrate carrying means. Any substrate transfer means may be used as long as it can supply a substrate for processing to the electrostatic chuck and can recover the processed substrate from the electrostatic chuck.
- the electrostatic chuck is composed of a central electrostatic chuck and a peripheral electrostatic chuck, it is preferable to use the gap formed between the edge of the substrate and the resin sheet by the height direction adjusting means.
- a substrate holding portion capable of holding the substrate is provided at the tip thereof. By providing the substrate holding portion, it is possible to reliably and easily supply the substrate to be processed and collect the substrate after processing.
- a robot arm equipped with a holding part that can hold the end of the board or a gap formed between the board and the resin sheet, and the board can be placed and recovered.
- the robot arm one that is generally used for transporting a substrate or the like can be used. That is, X can be supplied to the electrostatic chuck and recovered
- the foreign matter removing apparatus may further include a substrate lifting means that can be inserted into a gap between the substrate formed by the height direction adjusting means and the resin sheet to lift the substrate. Recovery of the substrate after processing can be performed more reliably and easily by a robot arm equipped with a clamping part and a fork.
- a substrate lifting means is not particularly limited, and examples thereof include a push-up pin that can push up the substrate from the direction of the substrate suction surface.
- the reverse operation to the substrate recovery may be performed. That is, the substrate is placed on the substrate lifting means, and the substrate is supplied onto the resin sheet laid on the central electrostatic chuck protruded by the height direction adjusting means. At this time, if the substrate lifting means is not provided, the substrate may be directly supplied to the central electrostatic chuck. Next, the height of the central electrostatic chuck and the peripheral electrostatic chuck is adjusted by the height direction adjusting means to form the substrate suction surface, and each electrostatic chuck is energized to attract the substrate. .
- the fat sheet it is sufficient to use a material that has a material strength that is at least softer than the substrate to be adsorbed.
- the outermost surface of the electrostatic chuck (that is, the substrate adsorption surface) needs to be a hard surface.
- the Knoop hardness is about 2000 Hk (for example, silicon carbide). Is 2500Hk and alumina is 2100Hk).
- the Knoop hardness of a silicon wafer is usually about 960 Hk.
- the Knoop hardness of iron which is considered to be the most harmful in the manufacture of semiconductors, is about 300 Hk.
- the Knoop hardness is about 315 Hk, which is about the same as that of iron, which is a foreign substance, and more preferably the Knoop hardness. 20 ⁇ : It is better to use LOOHk's grease sheet.
- the force applied to the substrate is the electrostatic chip used in normal semiconductor manufacturing equipment. Since it is equivalent to the chuck's adsorption force, in principle, the force applied to the substrate during peeling can be completely eliminated compared to the case of using an adhesive tape used to remove foreign matter. Therefore, foreign matter can be removed without damaging the substrate even for the mainstream semiconductor wafers with a diameter of 300 mm, for example, the next generation type 450 mm large-diameter wafers.
- Examples of the material of the above-mentioned resin sheet include polybutyl alcohol, low density polyethylene, polyethylene, polyvinylidene chloride, polyvinyl chloride, polypropylene, polyethylene terephthalate, acetyl cellulose, polycarbonate, nylon, polyimide, aramid.
- polybutyl alcohol low-density polyethylene, polyethylene, poly (vinylidene chloride), poly (vinyl chloride), polypropylene, and polyethylene are preferable. It is phthalate.
- a rubber-based material such as silicon.
- the thickness of the resin sheet is preferably 5 to: LOO / z m, more preferably 5 to 30 / ⁇ ⁇ ! This is because the adsorption force of the electrostatic chuck becomes smaller than 100 / z m! /. On the other hand, if the thickness is less than 5 m, handling of the resinous sheet becomes difficult and may be torn. Needless to say, the resin sheet must be manufactured in a controlled environment for the particles.
- the substrate when the volume resistance value of the resin sheet is lowered, the substrate may be more strongly attracted to the electrostatic chuck, particularly when the electrostatic chuck exhibits the Johnson's Rabeck force.
- a small current from the electrode forming the electrostatic chuck flows through the periphery of the electrode and the substrate adsorption surface to the substrate, and a large electrostatic adsorption force is generated in the minute gap between the substrate and the substrate adsorption surface. Is generated.
- the resin sheet having the material strength exemplified above exhibits high electrical insulation (volume resistance is in the range of 10 15 to 10 18 ⁇ ⁇ cm), but it contains a conductive feeler.
- the adsorption force of the substrate to the electrostatic chuck can be increased.
- the resin sheet supply means is not particularly limited as long as it can supply a sheet-shaped resin sheet, a roll-coated resin sheet, or the like to the substrate adsorption surface, but it is preferable.
- it has a feeding roll equipped with a resin sheet wound in a roll shape, and a supply-side guide roller for guiding the resin sheet fed from the feeding roll to the substrate suction surface side.
- the resin sheet collecting means is not particularly limited as long as it can recover the resin sheet supplied to the substrate adsorption surface, but it is preferable to wind the resin sheet. It is preferable to have a take-up roll and a collection-side guide roller that guides the resin sheet sent to the substrate suction surface force to the take-up roll side.
- the resin sheet supplying means and the resin sheet collecting means can be compatible with a roll-shaped resin sheet.
- the planar area (occupied area) occupied by the foreign substance removing device itself can be reduced.
- the removal of foreign matter can be repeated multiple times by continuously supplying unused grease sheets to a single substrate, and once the foreign matter is removed.
- a plurality of substrates can be processed continuously by recovering the substrate by the substrate transport means and supplying another new substrate to remove foreign substances.
- a general electrostatic chuck can be used as the electrostatic chuck for forming the substrate attracting surface.
- voltages having a potential difference are applied.
- It should be a bipolar electrostatic chuck with two electrodes. In other words, when the substrate adsorption surface is formed by the central electrostatic chuck and the peripheral electrostatic chuck, each electrostatic chuck should also have a bipolar electrostatic chuck force! /.
- the electrode forming the electrostatic chuck may form the substrate attracting surface. That is, the substrate attracting surface may be formed by an electrode forming a central electrostatic chuck and an electrode forming a peripheral electrostatic chuck.
- an electrostatic chuck is provided with an insulating dielectric layer made of an electrically insulating dielectric material in order to ensure insulation between the substrate and the electrode. It is usual to form the substrate chucking surface (outermost surface) of the electrostatic chuck. In addition to ensuring electrical insulation, this insulating dielectric layer has the role of protecting the electrode from mechanical damage and the role of preventing the occurrence of metal contamination from the electrode.
- the resin sheet when the resin sheet has electrical insulation, the resin sheet is an insulating dielectric layer in a general electrostatic chuck. Can also serve as a role. Therefore, the electrode forming the electrostatic chuck may be exposed on the outermost surface, and the substrate adsorption surface may be formed by the electrode. If the electrode is exposed on the outermost surface of the electrostatic chuck to form the substrate adsorption surface, the distance between the substrate and the electrode is reduced, so that the adsorption force expressed by the electrostatic chuck can be improved. Therefore, it is possible to obtain the same attractive force even at a low voltage, the power supply cost can be reduced, the generation of unnecessary static electricity is suppressed, and furthermore, the problem of electrode discharge short circuit due to high voltage is as much as possible. This can be avoided.
- the electrode forms a substrate adsorbing surface
- an elastic electrode force having a Shore hardness of 20 to 90 Hs and a volume resistivity of 100 to 1 X 10 " 5 ⁇ 'cm is also obtained.
- the volume resistivity is more preferably in the range of 1 ⁇ 10 1 2 to 1 ⁇ 10 ” 5 ⁇ ′cm.
- an electrode formed by mixing silicon rubber with a conductive filler such as carbon or carbon nanotube can be exemplified.
- fluorine-based, nitrile-based, fluorosilicon-based, etc. can be used as the rubber material.
- silicon rubber is preferable.
- the hardness of rubber is generally expressed in Shore hardness, and a Shore hardness of about 20 Hs is about the softness of human skin. Materials such as silicon wafers and glass substrates are not generally expressed in Shore hardness, but are thought to be orders of magnitude harder than these. Therefore, the above range is preferable from the viewpoint of exhibiting sufficient flexibility for the substrate to be adsorbed.
- the volume resistivity of the electrode is preferably lower, but in order to obtain a flexible electrode, it is necessary to mix a conductive filler with rubber, and therefore the above range. desirable. The reason why the material of the electrode has electrical conductivity is that, when V is supplied with a voltage, the potential is equal at all parts.
- the thickness of the electrode is preferably in the range of 0.05 to 3 mm, more preferably 0.2 to 3 mm. Good.
- the flexibility and thickness of the electrode are related, and a thin one is not excellent in flexibility.
- the cost may increase, so the thickness may change too much due to the flexibility of force.
- the substrate adsorption surface By forming the substrate adsorption surface with the elastic electrode as described above, it is possible to more reliably transfer the foreign matter adhering to the substrate to the resin sheet and remove it.
- the electrode that forms the substrate adsorption surface flexible enough to have the above Shore hardness, the adhesion of the substrate to the substrate adsorption surface can be further improved, and foreign substances can be transferred to the resin sheet. It can be made easy.
- a silicon wafer with a diameter of 200 mm usually has a warp or deflection of about 20 m, and there are a few local irregularities; about z m.
- the substrate chucking surface (outermost surface) of the electrostatic chuck has a hardness like ceramics, it is difficult to bring the entire surface of the wafer into close contact with only the chucking force of the electrostatic chuck. is there.
- the presence of the particles may hinder the adhesion of the substrate. Therefore, by adsorbing the substrate to the substrate adsorbing surface such as the above-mentioned elastic electrode via a resin sheet, these problems can be solved, and foreign matter can be removed more over the entire surface of the substrate. You will be able to do it reliably.
- the elastic electrode has excellent impact resistance, and even if it is adapted to one substrate and deformed along its shape, it can be restored by detaching the substrate and immediately adapted to adsorb another substrate. You can also
- a first electrostatic chuck that forms at least a first substrate adsorption surface and a second electrostatic chuck that forms a second substrate adsorption surface, of 2 An example of the foreign matter removing apparatus having two electrostatic chucks can be given.
- the processing capacity can be improved, and the effect of removing foreign matters when it is insufficient once can be made more complete.
- the contents described in the first configuration example of the foreign matter removing apparatus can be applied to the apparatus of the second configuration example.
- two electrostatic chucks are used as a foreign matter removing device including a plurality of electrostatic chucks each having a substrate attracting surface.
- the present invention is not limited to this. It may be configured to have more than one electrostatic chuck (more than 3rd electrostatic chuck).
- the substrate capable of adjusting the orientation of the substrate in the horizontal direction with respect to the substrate attracting surface. It is preferable to provide rotating means.
- the adhered foreign matter can be more reliably removed over the entire surface of the substrate. it can. That is, when the electrode forming the first electrostatic chuck is projected onto the substrate side adsorbed on the first substrate adsorption surface, the projected electrode and the projected electrode must not overlap!
- the substrate rotating means adjusts the orientation of the substrate so that the non-adsorption region is all included in the electrode projection region obtained by projecting the electrode forming the second electrostatic chuck onto the substrate side. 2 Foreign matter can be removed over the entire surface of the substrate by removing foreign matter using an electrostatic chuck.
- the substrate is attracted so that the end of the substrate is left behind the substrate attracting surface of the electrostatic chuck, so that the substrate can be supplied and recovered by the substrate transport means reliably and accurately using this end. Can be done. That is, when the electrode forming the first electrostatic chuck is projected onto the side of the substrate attracted to the first substrate attracting surface, the non-adsorptive region of the substrate where the projected electrode does not overlap the end of the substrate. Adsorb the substrate to the first substrate adsorbing surface to include, and
- the substrate transfer means may be a robot arm holder provided with a holding portion that can hold the end portion of the substrate.
- the electrode forming the second electrostatic chuck is projected onto the substrate side attracted to the second substrate attracting surface, the substrate and the projected electrode should not overlap.
- the first electrostatic chuck and the second electrostatic chuck also have a bipolar electrostatic chuck force including two electrodes to which voltages having a potential difference are applied
- the first electrostatic chuck The area corresponding to the distance between the two electrodes is the non-adsorption area of the substrate that does not overlap the projected electrode when these electrodes are projected onto the substrate adsorbed on the first substrate adsorption surface. Rotate the substrate so that the non-adsorption region of this substrate is included in the electrode projection region obtained by projecting the two electrodes that form the second electrostatic chuck onto the substrate side. Adjust by means to remove foreign matter with the second electrostatic chuck.
- a suitable substrate transfer means in the case of adsorbing the remaining end portion of the substrate is preferably a robot arm provided with a holding portion capable of holding the end portion of the substrate.
- the resin sheet to be used those described in the first configuration example can be used similarly.
- the resin sheet supply means and the resin sheet collection means are the same as those described in the first configuration example.
- the resin sheet supply means is wound in a round shape.
- a resin sheet collecting means comprising a feeding roll on which the resin sheet is mounted and a supply-side guide roller that guides the fed resin sheet to the first substrate suction surface side.
- the first substrate attracting surface may be formed by an electrode forming the first electrostatic chuck.
- the second substrate attracting surface is an electrode forming the second electrostatic chuck. It may be formed by. That is, in the second configuration example, as described in the first configuration example, the resin sheet can also serve as an insulating dielectric layer in a general electrostatic chuck.
- the substrate adsorption surface can be formed by the electrode to be formed. In this case, the electrode forming the substrate adsorption surface is preferred.
- the thickness should consist of an elastic electrode having a Shore hardness of 20 to 90Hs and a volume resistivity of 100 to 1 X 10 " 5 ⁇ 'cm, preferably from 0.05 to 3mm. The range of 0.2 to 3 mm is preferred, and the volume resistivity is more preferably in the range of 1 ⁇ 10—2 to 1 ⁇ 10 ” 5 ⁇ ′ cm.
- the time for attracting the substrate to the electrostatic chuck varies depending on the size and amount of the foreign matter adhering to the substrate. Foreign matter can be transferred to the fat sheet side. If the amount of foreign matter per unit area is large, it is effective to increase the adsorption time. If the electrostatic chuck used in the device is a bipolar electrostatic chuck, the attractive force can be adjusted by changing the voltage applied to the electrodes. Depending on the conditions, such as dropping or shortening the adsorption time, it is possible to cope with the conditions, and the operating parameters can be optimized so that the processing time per sheet is minimized. At this time, it is desirable that the adsorption force to the substrate per unit area is in the range of 10 to 300 gfZcm 2 .
- the foreign matter removing apparatus of the present invention can be used under atmospheric pressure or a slight pressure, which is not particularly required to be operated in a vacuum. Therefore, the processing time of the apparatus can be shortened because the procedure for evacuation or opening to the atmosphere can be omitted.
- foreign matter adhering to the substrate (foreign matter adhering to the substrate suction surface side) is transferred to the resin sheet and the resin sheet is collected, so that the removed foreign matter is applied to the substrate.
- the possibility of redeposition can be eliminated as much as possible.
- since foreign substances are removed without using adhesive tape there is no load when peeling from the substrate, which has been considered a problem in the past, and it can be applied to substrates that are becoming larger. There is no risk of damaging the board.
- a roll-shaped resin sheet is used, the effect of continuous processing becomes more conspicuous. Therefore, it is effective to use a semiconductor element at a production site where a processing capacity is particularly required.
- FIG. 1 is an explanatory plan view showing an example in which a substrate attracting surface is formed by a central electrostatic chuck and a peripheral electrostatic chuck.
- FIG. 2 is an explanatory plan view showing an example of forming a substrate attracting surface by a central electrostatic chuck and a peripheral electrostatic chuck.
- FIG. 3 is a cross-sectional explanatory view (a part) of the foreign matter removing apparatus when the substrate attracting surface is formed by the central electrostatic chuck and the peripheral electrostatic chuck.
- FIG. 4 is a cross-sectional explanatory view showing a state in which a substrate is adsorbed to the foreign matter removing apparatus.
- FIG. 5 is an explanatory cross-sectional view showing a state in which the central electrostatic chuck is protruded by the height direction adjusting means and a gap is formed between the end portion of the substrate and the resin sheet.
- FIG. 6 is a cross-sectional explanatory view showing a state in which the substrate after removing the foreign matter is collected.
- FIG. 7 is an explanatory plan view of a foreign substance removal system configured by combining a foreign substance removing apparatus with a supply side substrate cassette and a collection side substrate cassette.
- FIG. 8 is a perspective explanatory view (external view) of a foreign substance removal system configured by combining a foreign substance removal apparatus with a supply side substrate cassette and a recovery side board cassette.
- FIG. 9 is a cross-sectional explanatory view (a part) showing a modification of the foreign matter removing apparatus for forming a substrate attracting surface by a central electrostatic chuck and a peripheral electrostatic chuck.
- FIG. 10 is a plan explanatory view (part) illustrating an example of a foreign matter removing apparatus having a first electrostatic chuck and a second electrostatic chuck that each form a substrate attracting surface. .
- FIG. 11 is an explanatory plan view of a foreign matter removal system configured by combining a foreign matter removal device with an SMIF.
- the foreign matter removing apparatus X includes a central electrostatic chuck 2 having a relatively wide portion corresponding to the central portion of the substrate 1, and the periphery of the substrate 1 disposed on both sides of the central electrostatic chuck 2.
- a substrate attracting surface 4 having a square shape in plan view is formed by peripheral electrostatic chucks 3a and 3b corresponding to the portions.
- the substrate adsorption surface 4 is laid with a polyuric alcohol resin sheet 5 having a thickness of 10 ⁇ m.
- the resin sheet 5 is applied to the substrate suction surface 4 by the resin sheet supply means 9 so that the peripheral electrostatic chuck 3a, the central electrostatic chuck 2 and the peripheral electrostatic chuck 3a are sequentially arranged in the length direction. Supplied.
- the resin sheet supply means 9 includes a feed roll 6 on which a resin sheet 5 wound in a roll shape is mounted, and a pair of feeds that guide the resin sheet 5 fed from the feed roll 6 to the substrate suction surface side 4. It comprises a side guide roller 7 and a supply side adjustment roller 8 disposed between them for adjusting the tension of the resin sheet 5.
- the resin sheet 5 supplied to the substrate suction surface 4 includes a take-up roll 10 and a pair of collection-side guide rollers that guide the resin sheet 5 that has also received the substrate suction surface 4 force to the take-up roll 10 side. 11 and a collection side adjusting roller 12 disposed between them and collecting side adjusting roller 12 for adjusting the tension of the resin sheet 5 is collected.
- the central electrostatic chuck 2 and the two peripheral electrostatic chucks 3a and 3b each have a bipolar electrostatic chucking force, and the central electrostatic chuck 2 includes the first electrode 14 and the second electrode 15.
- Horn The electrodes 14 and 15 are connected to a power source 16 and are connected in series with a switch 17 for setting the voltage of the power source 16 to ON-OF F.
- the first electrode 18 and the second electrode 19 of the peripheral electrostatic chuck 3a, and the first electrode 20 and the second electrode 21 of the peripheral electrostatic chuck 3b are connected to the power source 16 via the switch 17, respectively. Is done.
- the peripheral electrostatic chucks 3a and 3b have lifter mechanisms (height direction adjusting means) not shown so that they can be moved up and down in the direction perpendicular to the substrate attracting surface 4 (in the direction of the double arrow in the figure). ) Is connected.
- a similar lifter mechanism (height direction adjusting means) (not shown) is connected to each of the supply side guide roller 7 and the collection side guide roller 11.
- a robot arm (not shown) having a fork on which the substrate 1 is placed is provided, and the substrate 1 to be processed is supplied to the substrate suction surface 4 and the processed substrate 1 is recovered.
- FIG. 3 shows that the substrate 1 (foreign matter 22 is attached to the substrate suction surface side) supplied by a robot arm (substrate transport means) (not shown) is placed on the resin sheet 5 on the substrate suction surface 4.
- the switch 17 of the power supply 16 is in the OFF state, and no voltage is applied to the electrostatic chuck of V or misalignment, and the substrate 1 is still attracted.
- Fig. 4 shows that the switch 17 of the power supply 16 is turned on, and an equivalent voltage is simultaneously applied between the first electrode and the second electrode of each electrostatic chuck, and the substrate 1 is connected via the resin sheet 5.
- the state of adsorption on the substrate adsorption surface 4 is shown. At this time, the foreign material 22 is in a state of being entrapped in the resin sheet 5.
- the adsorption time and the voltage of the power supply 16 can be adjusted.
- the adsorption time is 1 to 60 seconds, and the voltage between the terminals of the power supply 16 is variable from 0 to 8 kV.
- positive and negative potentials can be applied between the electrodes. In this case, the potential difference equivalent to the above is 0 to 4 kV.
- all the mechanisms such as the electrostatic chucks, rollers, etc., and the power supply, switch, etc. may be controlled by a controller (not shown) that manages their operation.
- the switch 17 is turned OFF, and then, as shown in FIG.
- the chuck 2 is projected from the peripheral electrostatic chucks 3a and 3b, and a gap is formed between the end of the substrate 1 and the resin sheet 5. That is, lifter mechanisms not shown
- the peripheral electrostatic chucks 3a, 3b, the supply side guide roller 7 and the recovery side guide roller 11 provided are lowered from the substrate suction surface 4 to the lower side in the vertical direction (the side opposite to the substrate suction surface 4).
- the state shown in FIG. 5 can be obtained. If a gap formed between the substrate 1 and the resin sheet 5 is used, the force that enables the robot arm to collect the substrate 1 is used.
- FIG. 5 shows a state in which the foreign material 22 adhered to the substrate 1 is transferred to the resin sheet 5.
- the substrate 1 after removing the foreign matter As shown in FIG. 6, it is provided at the tip of the robot arm in the gap between the substrate 1 lifted by the substrate push-up pin 23 and the resin sheet 5.
- the fork 24 is inserted, the substrate is placed on the fork 24 and collected by a robot arm (not shown).
- the resin sheet 5 having the foreign matter 22 transferred on the substrate suction surface 4 can be collected by being taken up by the take-up roll 10, and at the same time, a new oil that has also been fed out from the feed roll 6 side.
- the sheet 5 is supplied to the substrate suction surface 4 (in the direction of the arrow in the figure), and the next foreign substance removal process can be performed.
- the substrate 1 placed on the fork 24 is transferred to the substrate push-up pin 23, and the substrate push-up pin 23 is lowered to lower the central electrostatic chuck. 2 Place on the new grease sheet 5 above.
- the peripheral electrostatic chucks 3 a and 3 b are raised by the respective lifter mechanisms to form the substrate attracting surface 4 together with the central electrostatic chuck 2.
- the supply side guide roller 8 and the collection side guide roller 11 may be raised together by the lifter mechanism.
- the used resin sheet 5 collected on the take-up roll 10 can be discarded by installing a new resin sheet 5. do it.
- the foreign matter removing apparatus X includes a supply substrate cassette 26 in which an unprocessed substrate (before removing foreign matter) 1 is placed in the movable range of the robot arm 25,
- a substrate foreign matter removal system may be configured by installing a collection substrate cassette 27 for collecting the substrate 1 after processing (after foreign matter removal).
- FIG. 8 is an external view of the foreign matter removal system configured by the foreign matter removal device X and the substrate cassettes 26 and 27 as described above. An illustration is shown.
- the substrate attracting surface 4 is formed by the electrodes that form the central electrostatic chuck 2 and the peripheral electrostatic chucks 3a and 3b. That is, the central electrostatic chuck 2 has a thickness of 1 mm, a flat plate shape made of carbon-containing silicon conductive rubber (elastic electrode) having a volume resistivity of 1 X 10 " 4 ⁇ 'cm and a Shore hardness of 70Hs.
- the first electrode 31 and the second electrode 32 are attached to an aluminum metal substrate 33 through an engineering plastic insulating sheet (not shown) having a thickness of 50 ⁇ m or more.
- a flat plate-like first electrode 34 and second electrode 35 made of the same conductive rubber as described above are bonded to an aluminum metal base 36, and the peripheral electrostatic chuck 3b is the same as described above.
- the first electrode 37 and the second electrode 38 which are made of conductive rubber, are bonded to an aluminum metal base 39.
- the first electrode 31, 34, 37 and the second electrode 32, 35, 38 Are exposed to form a substrate adsorption surface 4 for adsorbing the substrate 1.
- the first electrode And between the second electrode and the insulating sheet, as well as between the insulating sheet and the metal base, Ru are bonded with each adhesive.
- the resin sheet having a low density polyethylene strength of 20 m in thickness is changed by changing the material from the previous resin sheet. It is better to use 5.
- the substrate attracting surface 4 is directly formed by the first electrodes 31, 34, 37 and the second electrodes 32, 35, 38 of each electrostatic chuck, it is the same even at a lower applied voltage than the previous example.
- the variable range of the adsorption time is preferably 1 to 60 seconds, and the voltage between the terminals of the power supply 16 is preferably 0 to 4 kV because the adsorption force can be exerted.
- FIG. 10 shows a foreign substance on a substrate having two electrostatic chucks, a first electrostatic chuck 41 that forms the first substrate suction surface 45 and a second electrostatic chuck 42 that forms the second substrate suction surface 48.
- Removal equipment FIG. 10 is a plan explanatory view (part) showing the device X; Both the first electrostatic chuck 41 and the second electrostatic chuck 42 also have a bipolar electrostatic chuck force, are lmm thick, have a volume resistivity of 1 X 10 " 4 ⁇ 'cm, and a Shore hardness Conductive rubber made of silicon containing 70Hs (elastic electrode) Electrode force that can be used as a force Affixed on a metal base made of aluminum via a polyethylene insulating sheet with a thickness of 50 ⁇ m or more to form each substrate adsorption surface The electrodes forming each electrostatic chuck and the insulating sheet, and between the insulating sheet and the metal substrate are bonded using an adhesive.
- the substrate 1 to be processed As an example of the substrate 1 to be processed, the case of removing foreign matter from a general silicon wafer 1 having a diameter of 300 mm will be described below.
- a flat plate-like first electrode 43 having a length of 216 mm and a width of 150 mm
- a flat plate-like second electrode 44 having a length of 216 mm and a width of 150 mm equally bisect the silicon wafer 1. So that they are 5 mm apart from each other.
- the first substrate adsorbing surface 45 comprising the first electrode 43 and the second electrode 44 is not adsorbing the entire surface of the silicon wafer 1 and the both ends of the silicon wafer 1 are protruded by 30 to 40 mm. Provided.
- the second electrostatic chuck 42 includes an H-shaped flat plate-shaped first electrode 46 having 310 mm in the feeding direction of a resin sheet 5 (described later) and 216 mm in the width direction, and the H-shaped first electrode 46.
- Two flat plate-like second electrodes 47 having a length of 70 mm and a width of 200 mm are arranged so as to fill the two space portions with a distance of 5 mm from the first electrode 46, respectively.
- the power source 16 is connected between the first electrode and the second electrode, respectively.
- the first electrostatic chuck 41 and the second electrostatic chuck 42 are supplied with a polyethylene resin sheet 5 having a thickness of 20 to 40 ⁇ m and a width of 220 to 230 mm.
- the rolls are wound in a roll and are guided to the first substrate suction surface 45 and the second substrate suction surface 48 via the supply-side guide roller 7.
- the take-up roll 10 winds up through the collection side guide port 11.
- These feed roll 6, supply side guide roller 7, collection side guide roller 11 and take-up roll 10 may be exemplified by a material having a diameter force of Sl0 to 50 mm and a length of 220 mm or more, and the material is made of stainless steel. it can.
- the feed roll 6 and the supply side guide A clean air ionizer may be installed between the roller 7 and the charge of the resin sheet 5 on which peeling charge or the like has accumulated, may be neutralized.
- a corona discharger can be used instead of an ionizer.
- a robot arm 50 having a holding portion that can further hold the end portion of the substrate, and the orientation of the silicon wafer 1 in the horizontal direction with respect to the substrate suction surface
- the foreign matter adhering to the silicon wafer 1 is removed by using the foreign matter removing apparatus X provided with the aligner (substrate rotating means) 51 capable of adjusting the thickness.
- the silicon wafer 1 to which foreign matter has adhered is supplied to the first substrate suction surface 45 of the first electrostatic chuck 41 by the robot arm 50.
- a voltage of ⁇ 1.5 kV is applied between the first electrode 43 and the second electrode 44 to suck the silicon wafer 1 and maintain the suction for 30 seconds.
- the voltage application to each electrode is stopped, the both ends, which are the non-adsorption regions of the silicon wafer 1, are held by the sandwiching portions of the robot arm 50, and the silicon wafer 1 is transferred to the aligner 51.
- the wafer 1 is again held by the robot arm 50 and supplied to the second substrate suction surface 48 of the second electrostatic chuck 42 this time.
- both ends of the wafer 1 that were not attracted by the first substrate attracting surface 45 and the gap between the first electrode 43 and the second electrode 44 are the first electrode 46 of the second electrostatic chuck 42 and All of the electrode projection areas obtained by projecting the second electrode 47 onto the wafer side are included.
- the wafer 1 is adsorbed and foreign matter is transferred to the side of the resin sheet 5 and removed.
- the robot arm 50 is utilized using both ends of the wafer 1 protruding from the second substrate suction surface 48, as in the case of the first electrostatic chuck 41. You can hold it and collect it.
- the removal of foreign matter on the wafer 1 using the substrate foreign matter removing apparatus X having the first electrostatic chuck 41 and the second electrostatic chuck 42 as described above is, for example, the first electrostatic chuck.
- the transfer of foreign matter to the side of the resin sheet 5 becomes insufficient.
- the position of the notch of wafer 1 attracted to the first electrostatic chuck 41 is upward as viewed in the drawing, and in the second electrostatic chuck 42 after being rotated by 90 °, the notch is shown in the drawing. The state of being adjusted leftward is shown.
- a foreign matter removal system may be configured by providing a plurality of SMIFs 52 within the movable range of the robot arm 50. That is, an untreated resin sheet 5 is laid on each substrate suction surface, and the wafer 1 taken out from one SMIF 52 is debris removed by the first electrostatic chuck 41, and the wafer 1 is once aligned by the robot arm 50. Transport to. Here, the wafer 1 is rotated 90 °, and the robot arm 50 again transfers the wafer 1 to the second electrostatic chuck 42 to remove foreign matter. After the removal of foreign matter is completed, it is sent again to the aligner 51 by the robot arm 50, reversed 90 °, and returned to the original SMIF52.
- the same processing can be performed for the SMIF 52 of the additional U, so that wafers can be processed efficiently.
- the productivity can be further improved.
- the adsorption and detachment of the wafer 1 in each electrostatic chuck may be repeated a plurality of times for the same wafer 1 in accordance with the adhesion state of foreign matter and the like.
- the resin sheet 5 to which foreign matter has been transferred may be replaced with a new resin sheet 5 each time the wafer 1 is adsorbed or detached, or may be replaced after being used several times. ⁇ ⁇ .
- the foreign matter removing apparatus of the present invention processes various substrates in a semiconductor wafer manufacturing factory, a semiconductor element manufacturing factory, a glass substrate manufacturing factory, a manufacturing factory of a thin display device using liquid crystal, plasma, organic materials, and the like. In this case, it is possible to suitably carry out the foreign matter removal work required.
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Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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JP2007524647A JP4616346B2 (ja) | 2005-07-12 | 2006-07-11 | 基板の異物除去装置及び基板の異物除去方法 |
US11/988,514 US8196594B2 (en) | 2005-07-12 | 2006-07-11 | Apparatus for removing foreign material from substrate and method for removing foreign material from substrate |
KR1020087003301A KR101202559B1 (ko) | 2005-07-12 | 2006-07-11 | 기판의 이물 제거장치 및 기판의 이물 제거방법 |
EP06780943.4A EP1908531A4 (en) | 2005-07-12 | 2006-07-11 | APPARATUS FOR REMOVING FOREIGN SUBSTRATE MATERIALS AND METHOD FOR REMOVING FOREIGN SUBSTRATE MATERIALS |
CN2006800253916A CN101223637B (zh) | 2005-07-12 | 2006-07-11 | 基板的异物去除装置以及基板的异物去除方法 |
HK08110877.9A HK1119485A1 (en) | 2005-07-12 | 2008-09-30 | Apparatus for removing foreign material from substrate and method for removing foreign material from substrate |
Applications Claiming Priority (2)
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JP2005-231315 | 2005-07-12 | ||
JP2005231315 | 2005-07-12 |
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WO2007007731A1 true WO2007007731A1 (ja) | 2007-01-18 |
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PCT/JP2006/313721 WO2007007731A1 (ja) | 2005-07-12 | 2006-07-11 | 基板の異物除去装置及び基板の異物除去方法 |
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US (1) | US8196594B2 (ja) |
EP (1) | EP1908531A4 (ja) |
JP (1) | JP4616346B2 (ja) |
KR (1) | KR101202559B1 (ja) |
CN (1) | CN101223637B (ja) |
HK (1) | HK1119485A1 (ja) |
TW (1) | TWI420579B (ja) |
WO (1) | WO2007007731A1 (ja) |
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KR101622415B1 (ko) * | 2008-03-13 | 2016-05-18 | 가부시키가이샤 니콘 | 기판홀더, 기판홀더 유니트, 기판반송장치 및 기판접합장치 |
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TWI467691B (zh) * | 2008-10-15 | 2015-01-01 | Creative Tech Corp | Electrostatic chuck and its manufacturing method |
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JP5833959B2 (ja) | 2011-09-28 | 2015-12-16 | 株式会社Screenホールディングス | 基板処理装置および基板処理方法 |
JP5768731B2 (ja) * | 2012-01-27 | 2015-08-26 | 三菱電機株式会社 | 異物除去装置、異物除去方法 |
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Also Published As
Publication number | Publication date |
---|---|
CN101223637B (zh) | 2012-01-18 |
TW200717629A (en) | 2007-05-01 |
EP1908531A1 (en) | 2008-04-09 |
TWI420579B (zh) | 2013-12-21 |
CN101223637A (zh) | 2008-07-16 |
JPWO2007007731A1 (ja) | 2009-01-29 |
US8196594B2 (en) | 2012-06-12 |
KR101202559B1 (ko) | 2012-11-19 |
HK1119485A1 (en) | 2009-03-06 |
EP1908531A4 (en) | 2015-02-25 |
KR20080038157A (ko) | 2008-05-02 |
US20090250077A1 (en) | 2009-10-08 |
JP4616346B2 (ja) | 2011-01-19 |
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