WO2014103484A1 - 積層研磨パッドの製造方法 - Google Patents
積層研磨パッドの製造方法 Download PDFInfo
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- WO2014103484A1 WO2014103484A1 PCT/JP2013/078294 JP2013078294W WO2014103484A1 WO 2014103484 A1 WO2014103484 A1 WO 2014103484A1 JP 2013078294 W JP2013078294 W JP 2013078294W WO 2014103484 A1 WO2014103484 A1 WO 2014103484A1
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- Prior art keywords
- polishing
- layer
- circular
- laminated
- polishing pad
- Prior art date
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- RUELTTOHQODFPA-UHFFFAOYSA-N toluene 2,6-diisocyanate Chemical compound CC1=C(N=C=O)C=CC=C1N=C=O RUELTTOHQODFPA-UHFFFAOYSA-N 0.000 description 1
- VOZKAJLKRJDJLL-UHFFFAOYSA-N tolylenediamine group Chemical group CC1=C(C=C(C=C1)N)N VOZKAJLKRJDJLL-UHFFFAOYSA-N 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 125000003258 trimethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
- B24B37/20—Lapping pads for working plane surfaces
- B24B37/26—Lapping pads for working plane surfaces characterised by the shape of the lapping pad surface, e.g. grooved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
- B24B37/20—Lapping pads for working plane surfaces
- B24B37/22—Lapping pads for working plane surfaces characterised by a multi-layered structure
-
- 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
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
-
- 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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/32115—Planarisation
- H01L21/3212—Planarisation by chemical mechanical polishing [CMP]
-
- 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
- H01L21/6835—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 using temporarily an auxiliary support
Definitions
- the present invention is a laminate for performing planarization processing of optical materials such as lenses and reflection mirrors, silicon wafers, glass substrates for hard disks, aluminum substrates, and materials that require high surface flatness such as general metal polishing processing.
- the present invention relates to a method for manufacturing a polishing pad.
- a step of forming a conductive layer on the wafer surface and forming a wiring layer by photolithography, etching, or the like, or a step of forming an interlayer insulating film on the wiring layer cause irregularities made of a conductor such as metal or an insulator on the wafer surface.
- miniaturization of wiring and multilayer wiring have been advanced for the purpose of increasing the density of semiconductor integrated circuits, and along with this, technology for flattening the irregularities on the wafer surface has become important.
- a polyurethane resin foam sheet is generally used as a polishing pad used for high-precision polishing.
- the polyurethane resin foam sheet is excellent in local flattening ability, it is difficult to apply a uniform pressure to the entire wafer surface because of insufficient cushioning properties. For this reason, usually, a soft cushion layer is separately provided on the back surface of the polyurethane resin foam sheet, and used as a laminated polishing pad for polishing (Patent Document 1).
- a semiconductor wafer polishing pad has been developed in which a polishing layer, a second layer having a higher elastic modulus than the polishing layer, and a third layer having a lower elastic modulus than the second layer are stacked in this order (patent).
- Reference 2 a semiconductor wafer polishing pad has been developed in which a polishing layer, a second layer having a higher elastic modulus than the polishing layer, and a third layer having a lower elastic modulus than the second layer are stacked in this order (patent).
- the laminated polishing pad having concentric grooves for holding and renewing the slurry manufactured by the conventional manufacturing method has a problem that the polishing layer and the support layer such as the cushion layer are easily peeled off.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a method for producing a polishing pad in which the polishing layer and the support layer are difficult to peel off.
- the present invention includes a step of forming concentric circular grooves and an outer peripheral region having a width of 1 ⁇ 2 or more of the groove pitch of the concentric circular grooves on a circular polishing sheet, and laminating the circular polishing sheet and a support layer together with an adhesive member. It is a manufacturing method of the lamination
- the present invention provides a laminated circular polishing pad in which a circular polishing layer and a support layer are laminated via an adhesive member, wherein the polishing layer has concentric grooves, and the polishing layer has the concentric grooves.
- the laminated circular polishing pad is characterized by having an outer peripheral region in which is not formed, and the width of the outer peripheral region is 1/2 or more of the groove pitch of the concentric circular grooves.
- the present invention also relates to a method for manufacturing a semiconductor device including a step of polishing a surface of a semiconductor wafer using the laminated circular polishing pad.
- the method for producing a laminated circular polishing pad of the present invention includes a step of forming concentric grooves on the circular polishing sheet and an outer peripheral region having a width of 1/2 or more of the groove pitch of the concentric grooves. Therefore, when the circular polishing sheet and the support layer are pressed and bonded together in the step of manufacturing the laminated polishing sheet by bonding the circular polishing sheet and the support layer via an adhesive member, the groove pitch of the concentric groove is 1 Since the pressure can be firmly applied to the ends of the circular polishing sheet and the support layer through the outer peripheral region having a width of 1 ⁇ 2 or more, a sufficient adhesive force can be secured to the ends of the laminated circular polishing pad. Therefore, according to this invention, the manufacturing method of the lamination
- the polishing layer has an outer peripheral region in which the concentric grooves are not formed, and the width of the outer peripheral region is 1/2 or more of the groove pitch of the concentric grooves. Therefore, when attaching the laminated circular polishing pad to the platen or the like of the polishing apparatus, it is possible to apply pressure firmly to the end of the laminated circular polishing pad, so that sufficient adhesive force is secured to the end of the laminated polishing pad. Can do. Therefore, according to the present invention, it is possible to provide a laminated polishing pad that is difficult to peel from the polishing apparatus.
- the manufacturing method of the laminated polishing pad of this embodiment includes a step of forming concentric grooves on the circular polishing sheet and an outer peripheral region having a width of 1/2 or more of the groove pitch of the concentric grooves, and bonding the circular polishing sheet and the support layer. It includes a step of producing a laminated abrasive sheet by bonding through a member.
- the circular polishing sheet is not particularly limited as long as it is a foam having fine bubbles.
- polyurethane resin polyurethane resin, polyester resin, polyamide resin, acrylic resin, polycarbonate resin, halogen resin (polyvinyl chloride, polytetrafluoroethylene, polyvinylidene fluoride, etc.), polystyrene, olefin resin (polyethylene, polypropylene, etc.), epoxy resin 1 type, or 2 or more types of mixtures, such as a photosensitive resin, is mentioned.
- Polyurethane resin is a particularly preferable material for forming the polishing layer because it has excellent wear resistance and a polymer having desired physical properties can be easily obtained by variously changing the raw material composition.
- the polyurethane resin will be described on behalf of the foam.
- the polyurethane resin is composed of an isocyanate component, a polyol component (high molecular weight polyol, low molecular weight polyol), and a chain extender.
- the isocyanate component a known compound in the field of polyurethane can be used without particular limitation.
- the isocyanate component 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 2,2′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate, aromatic diisocyanates such as p-phenylene diisocyanate, m-phenylene diisocyanate, p-xylylene diisocyanate, m-xylylene diisocyanate; ethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 1,6-hexamethylene diisocyanate, etc.
- Aliphatic diisocyanate 1,4-cyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate Isocyanate, alicyclic diisocyanates such as norbornane diisocyanate. These may be used alone or in combination of two or more.
- Examples of the high molecular weight polyol include those usually used in the technical field of polyurethane. Examples include polyether polyols typified by polytetramethylene ether glycol, polyethylene glycol, etc., polyester polyols typified by polybutylene adipate, polycaprolactone polyols, reactants of polyester glycols such as polycaprolactone and alkylene carbonate, etc. Polyester polycarbonate polyol obtained by reacting ethylene carbonate with polyhydric alcohol and then reacting the obtained reaction mixture with organic dicarboxylic acid, polycarbonate polyol obtained by transesterification of polyhydroxyl compound and aryl carbonate Etc. These may be used alone or in combination of two or more.
- low molecular weight polyamines such as ethylenediamine, tolylenediamine, diphenylmethanediamine, and diethylenetriamine
- alcohol amines such as monoethanolamine, 2- (2-aminoethylamino) ethanol, and monopropanolamine can be used in combination.
- These low molecular weight polyols and low molecular weight polyamines may be used alone or in combination of two or more.
- the blending amount of the low molecular weight polyol, the low molecular weight polyamine or the like is not particularly limited, and is appropriately determined depending on the properties required for the polishing pad (polishing layer) to be produced.
- a chain extender is used for curing the prepolymer.
- the chain extender is an organic compound having at least two active hydrogen groups, and examples of the active hydrogen group include a hydroxyl group, a primary or secondary amino group, and a thiol group (SH).
- the ratio of the isocyanate component, the polyol component, and the chain extender can be variously changed depending on the molecular weight of each, the desired physical properties of the polishing pad, and the like.
- the number of isocyanate groups of the isocyanate component relative to the total number of active hydrogen groups (hydroxyl group + amino group) of the polyol component and the chain extender is 0.80 to 1.20. Is more preferable, and 0.99 to 1.15 is more preferable. When the number of isocyanate groups is outside the above range, curing failure occurs and the required specific gravity and hardness cannot be obtained, and the polishing characteristics tend to be deteriorated.
- the polyurethane resin foam can be produced by applying a known urethanization technique such as a melting method or a solution method, but is preferably produced by a melting method in consideration of cost, working environment, and the like.
- the polyurethane resin foam can be produced by either the prepolymer method or the one-shot method.
- an isocyanate-terminated prepolymer is synthesized beforehand from an isocyanate component and a polyol component, and this is reacted with a chain extender.
- the polymer method is preferred because the resulting polyurethane resin has excellent physical properties.
- Examples of the method for producing a polyurethane resin foam include a method of adding hollow beads, a mechanical foaming method, and a chemical foaming method.
- a mechanical foaming method using a silicon surfactant which is a copolymer of polyalkylsiloxane and polyether and does not have an active hydrogen group is preferable.
- stabilizers such as antioxidants, lubricants, pigments, fillers, antistatic agents, and other additives may be added.
- the polyurethane resin foam may be a closed cell type or an open cell type.
- Polyurethane resin foam can be manufactured by batch feeding each component into a container and stirring, or by continuously supplying each component and non-reactive gas to the stirring device and stirring, It may be a continuous production method in which a dispersion is sent out to produce a molded product.
- the prepolymer that is the raw material of the polyurethane resin foam is placed in a reaction vessel, and then a chain extender is added and stirred, and then poured into a casting mold of a predetermined size to produce a block, and the block is shaped like a bowl or a band saw.
- a thin sheet may be used.
- a raw material resin may be dissolved and extruded from a T-die to directly obtain a sheet-like polyurethane resin foam.
- the thickness of the circular abrasive sheet is not particularly limited, but is usually about 0.8 to 4 mm, preferably 1.2 to 2.5 mm.
- the average cell diameter of the polyurethane resin foam is preferably 30 to 80 ⁇ m, more preferably 30 to 60 ⁇ m. When deviating from this range, the polishing rate tends to decrease, or the planarity of the polished material (wafer) after polishing tends to decrease.
- the specific gravity of the polyurethane resin foam is preferably 0.5 to 1.3.
- the specific gravity is less than 0.5, the surface strength of the polishing layer decreases, and the planarity of the material to be polished tends to decrease.
- the ratio is larger than 1.3, the number of bubbles on the surface of the polishing layer is reduced and planarity is good, but the polishing rate tends to decrease.
- the hardness of the polyurethane resin foam is preferably 40 to 75 degrees as measured by an Asker D hardness meter.
- Asker D hardness is less than 40 degrees, the planarity of the material to be polished is lowered, and when it is larger than 75 degrees, the planarity is good, but the uniformity (uniformity) of the material to be polished is lowered. There is a tendency.
- the method for forming concentric circular grooves in the circular polishing sheet is not particularly limited.
- a method of machine cutting using a jig such as a tool of a predetermined size, a resin in a mold having a predetermined surface shape, and the like.
- FIG. 2 and 3 are schematic configuration diagrams of a circular polishing sheet having a concentric circular groove and an outer peripheral region having a width larger than 1/2 of the groove pitch of the concentric circular groove.
- a circular polishing sheet 8 is used for the polishing layer of the polishing pad
- the polishing surface that comes into contact with the material to be polished has concentric grooves (recesses) 10 for holding and updating the slurry.
- the polishing layer has concentric grooves on the polishing surface, the slurry can be efficiently held and renewed, and the material to be polished can be prevented from being broken due to adsorption with the material to be polished.
- the groove width, groove depth, and groove pitch of the groove 10 are not particularly limited, but usually the groove width is about 0.1 to 5 mm, the groove depth is about 0.1 to 2 mm, and the groove pitch is 0.8 to 5
- the thickness is about 0.0 mm, preferably 1.5 to 4.0 mm.
- the width of the outermost peripheral portion 9 of the circular polishing sheet 8 of the present embodiment is 1/2 or more of the groove pitch of the concentric circular grooves 10, preferably the groove pitch or more, and more preferably wider than the groove pitch. When the width of the outermost peripheral portion 9 of the circular polishing sheet 8 of the present embodiment is less than 1 ⁇ 2 of the groove pitch of the concentric circular grooves 10, the outermost peripheral portion is easily deformed, so that the polishing sheet and the support layer are pressed.
- the top part of the outermost peripheral part 9 of the circular polishing sheet 8 of this embodiment exists on the same plane as the top part of the convex part between concentric circular grooves.
- the groove pitch of the grooves 10 is generally constant, the groove pitch, groove width, groove depth, etc. may be changed for each range in order to make the slurry retention and renewability desirable. it can.
- the width of the outermost peripheral portion 9 is 1/2 or more of the groove pitch closest to the outermost peripheral portion 9, and preferably equal to or larger than the groove pitch. More preferably, it is wider than the groove pitch.
- the upper limit of the width of the outermost peripheral portion 9 is not particularly limited, but is preferably not more than twice the groove pitch of the concentric circular grooves 10 from the viewpoint of not impairing the effect of holding and updating the slurry of the grooves 10.
- the width of the outermost peripheral part 9 is such that when pressing and bonding the polishing sheet and the support layer, pressure is firmly applied to the ends of the polishing sheet and the support layer, and when the polishing pad is attached to the surface plate, the polishing pad From the viewpoint of applying pressure firmly to the end of the groove, it is preferable that the groove is larger than the groove depth of adjacent grooves.
- the support layer supplements the characteristics of the polishing layer.
- a layer having a lower elastic modulus than the polishing layer (cushion layer) may be used, or a layer having a higher elastic modulus than the polishing layer (high elastic layer) may be used.
- the cushion layer is necessary in order to achieve both planarity and uniformity in a trade-off relationship in CMP. Planarity refers to the flatness of a pattern portion when a material having fine irregularities generated during pattern formation is polished, and uniformity refers to the uniformity of the entire material to be polished.
- the planarity is improved by the characteristics of the polishing layer, and the uniformity is improved by the characteristics of the cushion layer.
- the high elastic layer is used for improving the planarization characteristics of the polishing pad when a soft polishing layer is used in CMP to suppress the occurrence of scratches.
- a highly elastic layer it is possible to suppress excessive cutting of the edge portion of the material to be polished.
- the cushion layer examples include fiber nonwoven fabrics such as polyester nonwoven fabric, nylon nonwoven fabric, and acrylic nonwoven fabric; resin-impregnated nonwoven fabrics such as polyester nonwoven fabric impregnated with polyurethane; polymer resin foams such as polyurethane foam and polyethylene foam; butadiene rubber And rubber resins such as isoprene rubber; and photosensitive resins.
- the highly elastic layer examples include polyester films such as polyethylene terephthalate film and polyethylene naphthalate film; polyolefin films such as polyethylene film and polypropylene film; nylon films and the like.
- the method of laminating the circular abrasive sheet and the support layer through an adhesive layer is not particularly limited as long as the circular abrasive sheet and the support layer are laminated together, and supports, for example, a hot melt adhesive sheet.
- the pressing pressure is not particularly limited, but is about 0.1 to 1.0 MPa.
- double-sided tape may be used instead of the adhesive layer made of hot melt adhesive.
- the said double-sided tape what has the general structure which provided the adhesive layer on both surfaces of a base material can be used.
- the base material can prevent the slurry from penetrating to the support layer side, and can prevent peeling between the support layer and the adhesive layer.
- the substrate examples include polyester films such as polyethylene terephthalate film and polyethylene naphthalate film; polyolefin films such as polyethylene film and polypropylene film; nylon film and the like. Among these, it is preferable to use a polyester film having excellent properties for preventing water permeation.
- the composition of the adhesive layer include rubber adhesives and acrylic adhesives.
- the surface of the substrate may be subjected to easy adhesion treatment such as corona treatment or plasma treatment.
- the thickness of the substrate is not particularly limited, but is preferably 10 to 180 ⁇ m from the viewpoint of transparency, flexibility, rigidity, and the like.
- the thickness of the adhesive layer is preferably 10 to 200 ⁇ m, more preferably 30 to 100 ⁇ m.
- the laminated circular polishing pad may be provided with a double-sided tape on the surface to be bonded to the platen.
- the support layer and the double-sided tape may be the same size as the adhesive layer, and may be bonded to the polishing layer, or the sheet-like support layer and double-sided tape may be bonded to the polishing layer and then the size of the polishing layer. You may cut together.
- the semiconductor device is manufactured through a step of polishing the surface of the semiconductor wafer using the polishing pad.
- a semiconductor wafer is generally a laminate of a wiring metal and an oxide film on a silicon wafer.
- the method and apparatus for polishing the semiconductor wafer are not particularly limited. For example, as shown in FIG. 1, a polishing surface plate 2 that supports the polishing pad 1, a support table (polishing head) 5 that supports the semiconductor wafer 4, and the wafer. This is performed using a backing material for performing uniform pressurization and a polishing apparatus equipped with a polishing agent 3 supply mechanism.
- the polishing pad 1 is attached to the polishing surface plate 2 by attaching it with a double-sided tape, for example.
- the polishing surface plate 2 and the support base 5 are disposed so that the polishing pad 1 and the semiconductor wafer 4 supported on each of the polishing surface plate 2 and the support table 5 face each other, and are provided with rotating shafts 6 and 7 respectively. Further, a pressurizing mechanism for pressing the semiconductor wafer 4 against the polishing pad 1 is provided on the support base 5 side. In polishing, the semiconductor wafer 4 is pressed against the polishing pad 1 while rotating the polishing surface plate 2 and the support base 5, and polishing is performed while supplying slurry.
- the flow rate of the slurry, the polishing load, the polishing platen rotation speed, and the wafer rotation speed are not particularly limited and are appropriately adjusted.
- a semiconductor device is manufactured by dicing, bonding, packaging, or the like.
- the semiconductor device is used for an arithmetic processing device, a memory, and the like.
- a glass substrate for a lens or hard disk can be finished and polished by the same method as described above.
- the produced polyurethane foam was cut as thin as possible to a thickness of 1 mm or less in parallel with a microtome cutter, and used as a sample for measuring the average cell diameter.
- the sample was fixed on a glass slide and observed at 100 times using SEM (S-3500N, Hitachi Science Systems, Ltd.).
- SEM S-3500N, Hitachi Science Systems, Ltd.
- the image analysis software WinRoof, Mitani Shoji Co., Ltd.
- the polishing load was 5 psi
- the polishing platen rotation speed was 120 rpm
- the wafer rotation speed was 120 rpm.
- a dresser M100 type, manufactured by Asahi Dia Co., Ltd.
- the surface of the polishing layer was dressed for 20 seconds at predetermined intervals under the conditions of a dress load of 50 g / cm 2 , a dresser rotation speed of 15 rpm, and a platen rotation speed of 30 rpm.
- ⁇ No floating or peeling.
- X Floating or peeling is observed.
- a groove processing machine (manufactured by Techno Co.) is used for the buffed sheet to perform concentric groove processing on the surface with a groove width of 0.25 mm, a groove pitch of 1.5 mm, and a groove depth of 0.45 mm.
- the outer periphery was cut so that the convex portion had the width shown in Table 1, and a polishing layer having an outer diameter of about 61 cm was produced.
- double-sided tape is attached to the other side of the cushion sheet using a laminator, and the layers other than the polishing layer (double-sided tape + cushion sheet + double-sided tape) are cut according to the size of the polishing layer, and laminated polishing A pad was prepared.
- Example 1 Comparative Example 1
- Example 1 The same operation as in Example 1 was performed except that the width of the convex portion at the outermost peripheral portion of the laminated polishing pad was changed to the width shown in Table 1.
- Example 2 The same operation as in Example 1 was performed except that the shape of the outermost peripheral portion of the laminated polishing pad was concave.
- the method for producing a laminated polishing pad of the present invention requires high surface flatness such as optical materials such as lenses and reflecting mirrors, silicon wafers, glass substrates for hard disks, aluminum substrates, and general metal polishing processes. It can be used in a method for manufacturing a polishing pad that performs planarization of a material.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Abstract
Description
円形研磨シートは、微細気泡を有する発泡体であれば特に限定されるものではない。例えば、ポリウレタン樹脂、ポリエステル樹脂、ポリアミド樹脂、アクリル樹脂、ポリカーボネート樹脂、ハロゲン系樹脂(ポリ塩化ビニル、ポリテトラフルオロエチレン、ポリフッ化ビニリデンなど)、ポリスチレン、オレフィン系樹脂(ポリエチレン、ポリプロピレンなど)、エポキシ樹脂、感光性樹脂などの1種または2種以上の混合物が挙げられる。ポリウレタン樹脂は耐摩耗性に優れ、原料組成を種々変えることにより所望の物性を有するポリマーを容易に得ることができるため、研磨層の形成材料として特に好ましい材料である。以下、前記発泡体を代表してポリウレタン樹脂について説明する。
円形研磨シートに同心円溝を形成する方法は特に限定されるものではないが、例えば、所定サイズのバイトのような治具を用い機械切削する方法、所定の表面形状を有した金型に樹脂を流しこみ、硬化させることにより作製する方法、所定の表面形状を有したプレス板で樹脂をプレスし作製する方法、フォトリソグラフィを用いて作製する方法、印刷手法を用いて作製する方法、炭酸ガスレーザーなどを用いたレーザー光による作製方法などが挙げられる。
<支持層>
支持層は、研磨層の特性を補うものである。支持層としては、研磨層より弾性率が低い層(クッション層)を用いてもよく、研磨層より弾性率が高い層(高弾性層)を用いてもよい。クッション層は、CMPにおいて、トレードオフの関係にあるプラナリティとユニフォーミティの両者を両立させるために必要なものである。プラナリティとは、パターン形成時に発生する微小凹凸のある被研磨材を研磨した時のパターン部の平坦性をいい、ユニフォーミティとは、被研磨材全体の均一性をいう。研磨層の特性によって、プラナリティを改善し、クッション層の特性によってユニフォーミティを改善する。高弾性層は、CMPにおいて、スクラッチの発生を抑制するために柔らかい研磨層を用いた場合に、研磨パッドの平坦化特性を向上させるために用いられる。また、高弾性層を用いることにより、被研磨材のエッジ部の削り過ぎを抑制することが可能である。
前記円形研磨シートと支持層とを接着層を介して貼り合わせる方法は、前記円形研磨シートと支持層とを押さえて貼りあわせる方法であれば特に制限されず、例えば、ホットメルト接着剤シートを支持層(又は前記円形研磨シート)上に積層し、ヒーターにより接着剤を加熱溶融させ、その後、溶融した接着剤上に前記円形研磨シート(又は支持層)を積層してプレスする方法が挙げられる。プレス圧力は特に制限されないが、0.1~1.0MPa程度である。
半導体デバイスは、前記研磨パッドを用いて半導体ウエハの表面を研磨する工程を経て製造される。半導体ウエハとは、一般にシリコンウエハ上に配線金属及び酸化膜を積層したものである。半導体ウエハの研磨方法、研磨装置は特に制限されず、例えば、図1に示すように研磨パッド1を支持する研磨定盤2と、半導体ウエハ4を支持する支持台(ポリシングヘッド)5とウエハへの均一加圧を行うためのバッキング材と、研磨剤3の供給機構を備えた研磨装置などを用いて行われる。研磨パッド1は、例えば、両面テープで貼り付けることにより、研磨定盤2に装着される。研磨定盤2と支持台5とは、それぞれに支持された研磨パッド1と半導体ウエハ4が対向するように配置され、それぞれに回転軸6、7を備えている。また、支持台5側には、半導体ウエハ4を研磨パッド1に押し付けるための加圧機構が設けてある。研磨に際しては、研磨定盤2と支持台5とを回転させつつ半導体ウエハ4を研磨パッド1に押し付け、スラリーを供給しながら研磨を行う。スラリーの流量、研磨荷重、研磨定盤回転数、及びウエハ回転数は特に制限されず、適宜調整して行う。
(数平均分子量)
数平均分子量は、GPC(ゲル・パーミエーション・クロマトグラフィ)にて測定し、標準ポリスチレンにより換算した。
GPC装置:島津製作所製、LC-10A
カラム:Polymer Laboratories社製、(PLgel、5μm、500Å)、(PLgel、5μm、100Å)、及び(PLgel、5μm、50Å)の3つのカラムを連結して使用
流量:1.0ml/min
濃度:1.0g/l
注入量:40μl
カラム温度:40℃
溶離液:テトラヒドロフラン
作製したポリウレタン発泡体を厚み1mm以下になるべく薄くミクロトームカッターで平行に切り出したものを平均気泡径測定用試料とした。試料をスライドガラス上に固定し、SEM(S-3500N、日立サイエンスシステムズ(株))を用いて100倍で観察した。得られた画像を画像解析ソフト(WinRoof、三谷商事(株))を用いて、任意範囲の全気泡径を測定し、平均気泡径を算出した。
JIS Z8807-1976に準拠して行った。作製したポリウレタン発泡体を4cm×8.5cmの短冊状(厚み:任意)に切り出したものを比重測定用試料とし、温度23℃±2℃、湿度50%±5%の環境で16時間静置した。測定には比重計(ザルトリウス社製)を用い、比重を測定した。
JIS K6253-1997に準拠して行った。作製したポリウレタン発泡体を2cm×2cm(厚み:任意)の大きさに切り出したものを硬度測定用試料とし、温度23℃±2℃、湿度50%±5%の環境で16時間静置した。測定時には、試料を重ね合わせ、厚み6mm以上とした。硬度計(高分子計器社製、アスカーD型硬度計)を用い、硬度を測定した。
作製した積層研磨パッドを用いて、8000Åの膜厚のタングステンウエハを下記研磨条件にて60時間研磨を行い、その後、積層研磨パッドを目視にて観察し、層間に浮き又は剥離が発生したか否かを確認した。研磨装置としてSPP600S(岡本工作機械社製)を用いた。研磨条件としては、スラリーとして、W2000(キャボット社製)を超純水で2倍に希釈した希釈液に過酸化水素水を2重量%添加した水溶液を用い、当該水溶液を研磨中に流量150ml/minにて添加した。研磨荷重は5psi、研磨定盤回転数は120rpm、ウエハ回転数は120rpmとした。また、ドレッサー(旭ダイヤ社製、M100タイプ)を用い、ドレス荷重50g/cm2、ドレッサー回転数15rpm、プラテン回転数30rpmの条件にて、所定間隔で20秒間研磨層の表面をドレス処理した。
○:浮き又は剥離は見られない。
×:浮き又は剥離が見られる。
ポリエーテル系プレポリマー(ユニロイヤル社製、アジプレンL-325、NCO濃度:2.22meq/g)100重量部、及びシリコーン系界面活性剤(東レ・ダウコーニングシリコーン社製、SH-192)3重量部を重合容器内に加えて混合し、80℃に調整して減圧脱泡した。その後、撹拌翼を用いて、回転数900rpmで反応系内に気泡を取り込むように激しく約4分間撹拌を行った。そこへ予め120℃で溶融した4,4’-メチレンビス(o-クロロアニリン)(イハラケミカル社製、イハラキュアミンMT)26重量部を添加した。その後、約1分間撹拌を続けてパン型のオープンモールドへ反応溶液を流し込んだ。この反応溶液の流動性がなくなった時点でオーブン内に入れ、80℃で12時間ポストキュアを行い、ポリウレタン樹脂発泡体ブロックを得た。約80℃に加熱した前記ポリウレタン樹脂発泡体ブロックをスライサー(アミテック社製、VGW-125)を使用してスライスし、ポリウレタン樹脂発泡体シート(平均気泡径:50μm、比重:0.86、硬度:52度)を得た。次に、バフ機(アミテック社製)を使用して、厚さ1.27mmになるまで該シートの表面バフ処理をし、厚み精度を整えたシートとした。このバフ処理をしたシートに溝加工機(テクノ社製)を用いて表面に溝幅0.25mm、溝ピッチ1.5mm、溝深さ0.45mmの同心円の溝加工を行い、最外周部の凸部が表1に記載の幅になるよう外周をカットし外径約61cmの研磨層を作製した。
(実施例1)
前記研磨層の溝加工面と反対側の面にラミ機を使用して、両面テープ(積水化学工業社製、#5782PGW-A2、基材:ポリエステル系不織布、接着層:アクリル系接着剤、厚さ60μm、せん断応力:750kPa)を貼りつけた。更に、コロナ処理をしたクッションシート(東レ社製、ポリエチレンフォーム、トーレペフ、厚み0.8mm)の表面をバフ処理し、それをラミ機を使用して前記両面テープに貼り合わせた。さらに、クッションシートの他面にラミ機を使用して前記両面テープを貼り合わせ、研磨層以外の層(両面テープ+クッションシート+両面テープ)を研磨層の大きさに合わせて切断し、積層研磨パッドを作製した。
積層研磨パッドの最外周部の凸部の幅を表1に記載の幅に変更したこと以外は実施例1と同様に行った。
積層研磨パッドの最外周部の形状が凹状であること以外は実施例1と同様に行った。
Claims (4)
- 円形研磨シートに同心円溝及び前記同心円溝の溝ピッチの1/2以上の幅の外周領域を形成する工程、
前記円形研磨シートと支持層とを接着部材を介して貼り合わせて積層研磨シートを作製する工程を含む積層円形研磨パッドの製造方法。 - 請求項1に記載の積層円形研磨パッドの製造方法によって製造された積層円形研磨パッド。
- 円形研磨層と支持層とが接着剤部材を介して積層されている積層円形研磨パッドにおいて、
前記研磨層には同心円溝が形成されており、
前記研磨層は前記同心円溝が形成されていない外周領域を有しており、
前記外周領域の幅は前記同心円溝の溝ピッチの1/2以上であることを特徴とする積層円形研磨パッド。 - 請求項2又は3に記載の積層円形研磨パッドを用いて半導体ウエハの表面を研磨する工程を含む半導体デバイスの製造方法。
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US14/652,774 US20150336234A1 (en) | 2012-12-26 | 2013-10-18 | Method for producing layered polishing pads |
CN201380054962.9A CN104736297A (zh) | 2012-12-26 | 2013-10-18 | 层叠抛光垫的制造方法 |
KR1020157008681A KR20150052269A (ko) | 2012-12-26 | 2013-10-18 | 적층 연마 패드의 제조 방법 |
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JP2016124043A (ja) * | 2014-12-26 | 2016-07-11 | 東洋ゴム工業株式会社 | 研磨パッド |
CN205703794U (zh) * | 2015-06-29 | 2016-11-23 | 智胜科技股份有限公司 | 研磨垫的研磨层 |
JP1556818S (ja) * | 2015-10-28 | 2016-08-22 | ||
TWI642772B (zh) * | 2017-03-31 | 2018-12-01 | 智勝科技股份有限公司 | 研磨墊及研磨方法 |
JP6948878B2 (ja) * | 2017-08-22 | 2021-10-13 | ラピスセミコンダクタ株式会社 | 半導体製造装置及び半導体基板の研磨方法 |
US20230390970A1 (en) * | 2022-06-02 | 2023-12-07 | Rohm And Haas Electronic Materials Cmp Holdings, Inc. | Method of making low specific gravity polishing pads |
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JP2001054856A (ja) * | 1999-07-09 | 2001-02-27 | Applied Materials Inc | 化学的機械研磨装置での使用のための溝付パターンを有する研磨パッド |
WO2011008918A2 (en) * | 2009-07-16 | 2011-01-20 | Cabot Microelectronics Corporation | Grooved cmp polishing pad |
JP2012039094A (ja) * | 2010-07-12 | 2012-02-23 | Jsr Corp | 化学機械研磨パッドおよび化学機械研磨方法 |
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US7654885B2 (en) * | 2003-10-03 | 2010-02-02 | Applied Materials, Inc. | Multi-layer polishing pad |
US7807252B2 (en) * | 2005-06-16 | 2010-10-05 | Rohm And Haas Electronic Materials Cmp Holdings, Inc. | Chemical mechanical polishing pad having secondary polishing medium capacity control grooves |
JP2009220265A (ja) * | 2008-02-18 | 2009-10-01 | Jsr Corp | 化学機械研磨パッド |
CN101579838B (zh) * | 2008-05-13 | 2015-09-09 | 智胜科技股份有限公司 | 研磨方法、研磨垫及研磨系统 |
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2012
- 2012-12-26 JP JP2012283201A patent/JP2014124718A/ja active Pending
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2013
- 2013-10-18 US US14/652,774 patent/US20150336234A1/en not_active Abandoned
- 2013-10-18 CN CN201380054962.9A patent/CN104736297A/zh active Pending
- 2013-10-18 KR KR1020157008681A patent/KR20150052269A/ko not_active Application Discontinuation
- 2013-10-18 WO PCT/JP2013/078294 patent/WO2014103484A1/ja active Application Filing
- 2013-10-28 TW TW102138911A patent/TW201429617A/zh unknown
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JPH05146969A (ja) * | 1991-06-24 | 1993-06-15 | Intel Corp | 半導体基板上に形成された誘電体層を研磨する装置 |
JP2001054856A (ja) * | 1999-07-09 | 2001-02-27 | Applied Materials Inc | 化学的機械研磨装置での使用のための溝付パターンを有する研磨パッド |
WO2011008918A2 (en) * | 2009-07-16 | 2011-01-20 | Cabot Microelectronics Corporation | Grooved cmp polishing pad |
JP2012039094A (ja) * | 2010-07-12 | 2012-02-23 | Jsr Corp | 化学機械研磨パッドおよび化学機械研磨方法 |
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KR20150052269A (ko) | 2015-05-13 |
TW201429617A (zh) | 2014-08-01 |
CN104736297A (zh) | 2015-06-24 |
JP2014124718A (ja) | 2014-07-07 |
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