WO2007138975A1 - 研磨剤組成物および研磨方法 - Google Patents
研磨剤組成物および研磨方法 Download PDFInfo
- Publication number
- WO2007138975A1 WO2007138975A1 PCT/JP2007/060610 JP2007060610W WO2007138975A1 WO 2007138975 A1 WO2007138975 A1 WO 2007138975A1 JP 2007060610 W JP2007060610 W JP 2007060610W WO 2007138975 A1 WO2007138975 A1 WO 2007138975A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polishing
- wiring
- abrasive composition
- ion
- copper
- Prior art date
Links
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- 238000000034 method Methods 0.000 title claims abstract description 40
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
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- 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
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/04—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed mechanically, e.g. by punching
- H05K3/045—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed mechanically, e.g. by punching by making a conductive layer having a relief pattern, followed by abrading of the raised portions
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
- H05K2201/0203—Fillers and particles
- H05K2201/0206—Materials
- H05K2201/0209—Inorganic, non-metallic particles
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/02—Details related to mechanical or acoustic processing, e.g. drilling, punching, cutting, using ultrasound
- H05K2203/025—Abrading, e.g. grinding or sand blasting
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
- H05K2203/0779—Treatments involving liquids, e.g. plating, rinsing characterised by the specific liquids involved
- H05K2203/0786—Using an aqueous solution, e.g. for cleaning or during drilling of holes
- H05K2203/0796—Oxidant in aqueous solution, e.g. permanganate
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/107—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by filling grooves in the support with conductive material
Definitions
- the present invention relates to an abrasive composition and a polishing method.
- CMP Chemical Mechanical Polishing
- the wiring board has a semiconductor package or a bare chip mounted thereon and is supported and fixed, and also plays a role in controlling electrical connection between the knocker and the chip. Therefore, in this technology, various support substrate materials that form the core, various conductive materials that control the electrical connection wiring, and various insulating materials that insulate between the individual signal wirings are combined to stabilize the material. A high-density multilayer wiring structure is formed.
- Wiring boards are classified into organic wiring boards and inorganic wiring boards depending on the type of base core material. Broadly divided. Among these, organic wiring boards typified by printed wiring boards are useful as mounting wiring boards for high-speed elements because they have a lower relative dielectric constant than inorganic wiring boards.
- a conventional organic wiring board is formed with a groove for a wiring circuit and a hole for via connection formed on a resin base material.
- the hole was filled with a conductive material, and then the excess conductive material was removed by polishing and the surface was flattened, and then the bare chip was mounted on a resin substrate.
- the polishing in this case is mechanical polishing, and is performed, for example, by moving a polishing film coated with white aluminium abrasive grains on a resin base material.
- mechanical polishing has the advantage of increasing the polishing rate, but there was a risk of scratching the metal substrate of the wiring metal.
- the CMP method described above a slurry that is powerful with the barrel and the chemical is used.
- the CMP method is a polishing that uses both mechanical and chemical action, so there are fewer scratches compared to mechanical polishing.
- an organic wiring substrate is manufactured using the conventional CMP method, there is a problem that the throughput is lowered because the polishing rate is slow.
- metal wiring is formed on a semiconductor substrate such as a silicon wafer, and the metal wiring is formed on a resin base material provided on a support substrate. If so, it will be discussed.
- Patent Documents 3 and 4 describe the use of a salt of an organic acid or an inorganic acid and a basic compound as a polishing rate regulator.
- the purpose of this polishing rate modifier is to reduce the polishing rate of the wiring metal layer and increase the polishing selectivity with the noble metal layer, and to increase the polishing rate of the wiring metal layer. Is not listed
- the polishing rate is increased by using amino acids as the copper chelating agent and further using a polishing liquid containing an etching agent for copper, an oxidizing agent for copper, and water.
- the throughput can be improved.
- the etching agent described in Patent Document 5 etches the surface of the copper layer by a chemical action, and has a function of further promoting the polishing process by the mechanical action of the abrasive grains. Therefore, in order to increase the polishing rate for the copper layer, it is effective to increase the etching rate, that is, the dissolution rate of copper. Specifically, the concentration of electrolytes such as various organic acids, inorganic acids or ammonia contained in the abrasive composition is increased. However, in this case, if the dissolution rate of copper is too high, there is a risk that even the copper of the wiring portion that should not be polished will be dissolved. When copper in the wiring part melts, there is a problem that the wiring resistance increases due to a decrease in the wiring thickness.
- an abrasive composition having a too high dissolution rate of copper has a problem in that the step-resolving property is lowered. This point will be described in detail below.
- the level difference elimination property is a characteristic of eliminating irregularities by polishing a surface having irregularities, and more specifically, with respect to the polishing rate of the convex portion to be originally polished, It means the characteristic that the step between the convex part and the concave part is made smaller as the polishing progresses by relatively reducing the polishing rate of the concave part that should not be polished.
- step resolution is one of the important technical elements in wiring formation.
- an abrasive composition with a copper dissolution rate that is too fast is used, the projections are polished at a high polishing rate, while the polishing rate for the recesses is increased. It becomes difficult. Therefore, such an abrasive composition has a problem that it has poor step resolution.
- Patent Document 5 there is a description that a sufficient polishing rate cannot be obtained when the addition amount of the etching agent is less than a predetermined value, but when the addition amount is more than the predetermined value, the etching is not performed. It is only described that there is a possibility that the bonding agent may be deposited, and there is a description of the problem of the increase in wiring resistance due to the dissolution of the copper in the wiring part and the problem of level difference elimination.
- Patent Document 6 describes polishing of a semiconductor device including a copper film and a tantalum compound film, and the polishing rate for a copper film is higher than the polishing rate for a tantalum compound film.
- Patent Document 6 a tantalum oxide is obtained by a polishing composition obtained by dissolving a polishing agent, an oxidizing agent and a reducing agent, and if necessary, a chelating compound in water. It is said that the compound film can be polished at a high polishing rate.
- Patent Document 6 there is a description and suggestion of the problem of the above-described increase in wiring resistance and the problem of step resolution.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-197806
- Patent Document 2 JP 2001-110761 A
- Patent Document 3 Japanese Patent Laid-Open No. 2003-286477
- Patent Document 4 Japanese Patent Application Laid-Open No. 2003-297779
- Patent Document 5 Japanese Patent Laid-Open No. 2003-257910
- Patent Document 6 JP 2000-160139 A
- an object of the present invention is to provide a polishing agent composition that can achieve both a high speed with respect to an object to be polished, a polishing speed, and excellent level difference elimination.
- an object of the present invention is to provide a polishing method capable of rapidly polishing a wiring metal while suppressing an increase in wiring resistance and having excellent step resolution.
- the abrasive composition of the present invention comprises abrasive grains
- the concentration of the chelating agent is preferably 0.0005 molZkg to 0.05 molZkg.
- the concentration of the ammonia ions is preferably 0.3 molZkg or more.
- the concentration of the polyvalent carboxylate ion is preferably 0.05 molZkg to 0.5 molZkg.
- the polyvalent carboxylate ion preferably contains a citrate ion.
- the bullet is preferably ⁇ -alumina.
- the oxidizing agent is preferably hydrogen peroxide.
- the abrasive composition of the present invention may further contain at least one ion selected from the group consisting of carbonate ion, hydrogen carbonate ion, sulfate ion and acetate ion.
- the concentration of any one kind of ions selected from the group force or the sum of the concentrations of two or more kinds of ions selected from the group is preferably from 0.01 molZkg to 0.2 molZkg.
- ions are added to the abrasive of the present invention by adding at least one selected from the group consisting of ammonium carbonate, ammonium hydrogen carbonate, ammonium sulfate, and ammonium acetate. It can be included in the composition.
- the abrasive composition of the present invention preferably has a pH of 6-10.
- the abrasive composition of the present invention may further comprise a copper surface protective agent.
- the polishing method of the present invention polishes a wiring metal using the above-described abrasive composition.
- the wiring metal may be one of copper and a copper alloy.
- the wiring metal may be provided on a resin base material.
- the abrasive composition of the present invention comprises at least one chelating agent selected from the group consisting of ammonia ions, polyvalent carboxylate ions, pentaethylenehexamine, triethylenetetramine, and tetraethylenepentamine. Because it contains the agent, fast polishing to the workpiece Both speed and excellent step resolution can be achieved.
- the polishing rate can be increased while suppressing an increase in the wiring resistance, and excellent. It is also possible to obtain level difference elimination.
- polishing is performed by a chemical and mechanical action, so that the generation of scratches on the wiring metal can be reduced as compared with mechanical polishing.
- FIG. 1 is a schematic side cross-sectional view of a resin base material provided on a support substrate.
- FIG. 2 is a diagram illustrating a polishing method using the abrasive composition of the present invention.
- FIG. 3 is a schematic sectional side view of a wiring board manufactured according to the present invention.
- FIG. 4 (a) is a partial cross-sectional schematic view of an object to be polished before polishing in an example, and (b) is a partial cross-sectional schematic view of the object to be polished in the middle of polishing.
- FIG. 5 A graph evaluating the step resolution of the step 1 portion for the example and the comparative example.
- FIG. 6 A graph evaluating the step resolution of the step 2 portion for the example and the comparative example.
- FIG. 7 is a graph showing an evaluation of the step-resolvability of the step 3 portion for the example and the comparative example.
- partial force S ionization of the polished wiring metal is performed and dissolved in the abrasive composition.
- the dissolved metal ions act as a catalyst, causing the oxidant to decompose and causing the oxidation reaction to run away.
- the wiring metal is copper
- copper ions act as a catalyst to cause a decomposition reaction of hydrogen peroxide.
- the radicals generated by this decomposition reaction exhibit a strong oxidizing action, so that the dissolution of the wiring metal is promoted.
- many metal ions are present, so that the dissolution of the wiring metal is further promoted.
- the polishing rate is increased, the copper polishing rate in the wiring portion and the concave portion is increased, leading to an increase in wiring resistance and a decrease in level difference elimination.
- polishing including at least one chelating agent selected from the group power consisting of pentaethylenehexamine, triethylenetetramine, and tetraethylenepentamine, and an electrolyte that generates ammonia ions and polyvalent carboxylate ions. It has been found that the above object can be achieved by the agent composition.
- ammonia ions or polyvalent carboxylate ions is effective in increasing the polishing rate for the wiring metal.
- the abrasive composition of the present invention it is possible to achieve both a high polishing rate and excellent step resolution. Also, Since the wiring portion can be prevented from being polished, an increase in wiring resistance can be suppressed.
- Patent Document 6 discloses a polishing composition containing an abrasive, an oxidizing agent, a reducing agent and water. Furthermore, it is described that a chelating agent that exhibits chelating action with respect to copper can be added to the polishing composition as needed. However, Patent Document 6 aims to provide a polishing composition having a high polishing rate for a tantalum compound film and a low polishing rate for an insulating film such as a diacid / silicon oxide film. The addition of the chelating agent is performed in order to improve the polishing rate for a copper film having a large amount to be polished.
- the present invention aims to achieve both improvement of the polishing rate and improvement of level difference elimination, and the ratio of the polishing rate between the tantalum compound film and the insulating film is a problem. It is too different from the patent document 6 for a different purpose. For this reason, the improvement of the polishing rate for the copper film is achieved by adding a chelating agent in Patent Document 6, whereas in the present invention, it is mainly achieved by ammonium ions and polyvalent carboxylate ions. .
- the chelating agent in the present invention is used for the purpose of suppressing the decomposition reaction of the oxidizing agent and preventing the polishing rate for the wiring metal from becoming excessively high.
- the polishing rate is reduced as compared with the case where no chelating agent is added, it is possible to realize excellent level difference elimination.
- Abrasive grains are polished by mechanical action. Generally, the polishing rate can be increased as the grain size of the abrasive grains increases and becomes harder. However, on the other hand, polishing scratches are likely to occur on the surface of the object to be polished. For this reason, it is important to select abrasive grains having an appropriate particle size and hardness in consideration of the polishing rate and polishing scratches.
- a wiring metal such as copper provided on the resin base material is an object to be polished. Therefore, unlike the case of polishing a semiconductor substrate or the like, it is possible to select abrasive grains by giving priority to increasing the polishing rate over suppressing polishing flaws. Therefore, when polishing semiconductor substrates, etc.
- the average particle diameter of the abrasive grains is large, and it is preferable that the abrasive grains are hard. Even under such conditions, in the present invention, polishing is performed using both a mechanical action and a chemical action. Therefore, compared to polishing performed only by a mechanical action, scratches on the object to be polished are generated. Can be minimized.
- Examples of the barrel in the present invention include a alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2 O 3), 13 alumina (a-Al 2
- Acid-aluminum such as ( ⁇ -Al)); cerium oxide (CeO); silicon dioxide (SiO 2);
- Oxidized titanium TiO 2
- oxidized Zirconium ZrO 2
- cannonballs may be used in combination of two or more types, not limited to single use.
- ⁇ -alumina is preferable because it is inexpensive and can increase the polishing rate.
- ⁇ -alumina having an average particle size of about L m can be used by adding it so as to have a concentration of 2.5 wt% to 3.0 wt% of the total weight of the abrasive composition. .
- the abrasive grains are present in a state dispersed in an aqueous medium in the abrasive composition.
- aqueous medium for example, high-purity water such as ion-exchanged water, or one containing water as a main component and an organic solvent soluble in water is used.
- organic solvent include lower alcohols having 1 to 5 carbon atoms such as methanol, ethanol, propanol, butanol, and ethylene glycol.
- polishing can be promoted by adding an oxidizing agent to the polishing composition. Specifically, an oxide film is formed on the surface of the wiring metal that is the object to be polished by the action of the oxidizing agent. Then, by removing this acid film from the surface of the resin base material with mechanical force, or by the action of an oxidizing agent, it becomes wiring metal force S ions and dissolves in the abrasive composition. Polishing is promoted.
- the concentration of the oxidizing agent is preferably included in the abrasive composition in the range of 0.1 molZkg to LOmolZkg, and more preferably in the range of 0.5 molZkg to 5 molZkg. .
- Examples of the oxidizing agent include hydrogen peroxide, urea peroxide, peracetic acid, iron nitrate, and iodine. Acid salts and the like can be used.
- hydrogen peroxide is preferred because it can reduce the contamination of the wiring board by heavy metals and organic substances.
- the chelating agent at least one selected from the group force consisting of pentaethylenehexamine, triethylenetetramine and tetraethylenepentamine is used.
- the chelating agent has a chelating action on copper, other chelating agents can be added.
- the chelating agent in this case include ethylenediamine, diethylenetriamine, hexaethyleneheptamine, ethylenediamintetraacetic acid, diethylenetriaminepentaacetic acid, triethylenetetraminehexaacetic acid, ditritriacetic acid and the like.
- ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, or hexaethyleneheptamine which are polyamines having a nitrogen atom in the molecule, are suitable for copper ions and moderate amounts. It is preferable to have binding energy. Moreover, if the molecular weight of the chelating agent is small, the step-resolving property may be lowered, and if the molecular weight is large, the solubility of the chelating agent is lowered and the stability of the polishing composition may be deteriorated. Therefore, triethylenetetramine, tetraethylenepentamine, or pentaethylenehexamine having an appropriate molecular weight is more preferable.
- the chelating agent is preferably contained in the abrasive composition at a concentration of 0.0005 molZkg to 0.05 molZkg, particularly at a concentration of 0.001 molZkg to 0. Olmol / kg. Is preferred. Pentaethylenehexamine, triethylenetetramine, and tetraethylenepentamine can each be in the above concentration range. When two or more chelating agents are combined and contained in the abrasive composition, the sum of the chelating agent concentrations may be within the above range. If the concentration of the chelating agent is too low, the decomposition of the oxidizing agent cannot be sufficiently suppressed, and the step-resolving property is deteriorated. On the other hand, if the concentration of the chelating agent is too high, the polishing rate may be reduced.
- Ammonium ions play a role in chemically etching the wiring metal that is the object to be polished.
- Ammonium ions are preferably included in the abrasive composition at a concentration of 0.1 molZkg or more, and more preferably 0.3 molZkg or more. 0. If the concentration is lower than ImolZkg, a sufficient polishing rate may not be obtained. In addition, it is preferable that the ammonium ion is contained at a concentration of 2.5 molZkg or less in terms of stability of the abrasive composition.
- a diffusion preventive film such as a tantalum (Ta) film or a tantalum nitride (TaN) film is formed to prevent copper diffusion.
- a diffusion preventive film such as a tantalum (Ta) film or a tantalum nitride (TaN) film is formed to prevent copper diffusion.
- Ta tantalum
- TaN tantalum nitride
- the diffusion prevention film is not provided in the manufacturing process of the wiring board, it is not necessary to consider such problems. Therefore, as long as other polishing characteristics are not deteriorated, more amorphous ions can be contained as compared with the case of providing a diffusion barrier film.
- ammonia ion source it is particularly preferable to use inexpensive ammonia as the ammonia ion source.
- an inorganic salt such as salt water can be used. Further, it may be supplied by adding carbonate ions, hydrogen carbonate ions, sulfate ions and acetate ions, which will be described later, in the form of ammonium salts.
- the polyvalent carboxylate ion has the effect of etching the wiring metal as the object to be polished. It also has the effect of suppressing dating and improving step resolution.
- dating means that when a metal embedded wiring is formed, a portion where the width of the wiring is wide is excessively polished, resulting in a state where the central portion is depressed. Such a problem can be made difficult to occur when the abrasive composition contains polyvalent carboxylate ions.
- polyvalent carboxylate ions for example, oxalic acid ions (CO 2 "), maleic acid I O
- Chenic acid is preferably used from the standpoints of being inexpensive and inexpensive.
- malonic acid CH (COOH)
- glutaric acid ((CH) (COOH)
- adipic acid ((CH) (CO)
- the abrasive composition of the present invention it is preferable that it is contained at a concentration of 0.5 OlmolZkg or more, which is related to the polyvalent carboxylate ion titer, in particular 0.05 molZkg to 0.5 mol / Included in a concentration of kg, preferred.
- concentration of polyvalent carboxylate ions is lower than 0. OlmolZkg, the effect of the present invention cannot be obtained.
- the polycarboxylic acid concentration is 0.5 molZkg or more, the polishing rate hardly changes.
- the abrasive composition of the present invention may contain at least one ion selected from the group consisting of carbonate ion, hydrogen carbonate ion, sulfate ion and acetate ion. The presence of these ions can further improve the polishing rate.
- carbonate ion, hydrogen carbonate ion, sulfate ion and acetate ion are contained in the abrasive composition at a concentration of 0.005 mol / kg to l. Omol / kg irrespective of the valence. , Preferably in a concentration of 0.01 molZkg to 0.2 molZkg. When the concentration is lower than 0.05 molZkg, the effect of improving the polishing rate is hardly obtained. On the other hand, when the concentration is higher than 1. OmolZkg, it is preferable because the polishing properties decrease due to the increase in the viscosity of the abrasive composition.
- Carbonate ions, hydrogen carbonate ions, sulfate ions, and acetate ions can each be in the above-mentioned concentration range. Further, when two or more kinds of ions are combined and contained in the abrasive composition, the sum of the concentrations of each ion may be within the above range. Further, the concentration of ions is not related to the valence of ions.
- the abrasive composition can contain either one of carbonate ion or hydrogen carbonate ion within the above concentration range.
- the abrasive composition can also contain both carbonate ions and bicarbonate ions. In this case, the sum of the carbonate ion and hydrogen carbonate ion concentrations is within the above range.
- carbonate ion, hydrogen carbonate ion, sulfate ion and acetate ion are, for example, ammonium carbonate ((NH) CO), ammonium hydrogen carbonate (NH HCO
- neum salt It can be used in the form of a neum salt. However, it is not limited to the ammonium salt, but may be a salt of another basic compound such as a thilium salt.
- the abrasive composition of the present invention is arranged to prevent dishing of the wiring metal part. It is preferable to include a surface protective agent having a function of forming a protective film on the surface of the wire metal (particularly copper or copper alloy).
- the surface protective agent for example, BTA (benzotriazole), TTA (tolyltriazole), benzotriazole 4-carboxylic acid and the like can be used.
- BTA benzotriazole
- TTA tolyltriazole
- benzotriazole 4-carboxylic acid and the like can be used.
- 1H-tetrazole, 5 amino-1H-tetrazole, 5-methyltetrazole, thiourea, salicylaldoxime, catechol, and the like are used in the same manner.
- the wiring metal is copper
- these substances are physically or chemically adsorbed, so that a film is formed on the surface of copper and elution of copper is suppressed.
- the above-exemplified substances may be used alone or in combination of two or more.
- BTA is contained in the abrasive composition at a concentration of 0.0005 mol / kg to 0.005 mol / kg. It is preferably contained at a concentration of OOlmol / kg to 0.02 molZkg. When the concentration is lower than 0.0005 molZkg, the effect as a surface protecting agent cannot be obtained. On the other hand, if the concentration is higher than 0.05 mol / kg, the polishing rate decreases, which is not preferable.
- the abrasive composition of the present invention may contain a pH adjuster, a surfactant and the like, if necessary.
- the abrasive composition of the present invention preferably has a pH of 6 or more so as not to oxidize the copper to be polished.
- the pH is preferably in the range, and the pH is more preferably in the range of 7.5 to 9.5.
- the pH is more preferably in the range of 8 to 9.5.
- acid and ammonium in the polishing agent composition - may be adjusted by adding a force more P H adjusting agent can adjust the pH by Blend of Umuion.
- the addition amount of the pH adjuster is not particularly limited as long as it does not impair the polishing performance.
- an appropriate acid or alkali can be used as the pH adjuster.
- concentration of carbonate ion, hydrogen carbonate ion, sulfate ion, acetate ion, ammonium ion, etc. in the abrasive composition is determined according to the present invention. It is necessary that the range force specified in step 1 is not changed.
- nitric acid or the like is used as the pH adjusting agent for the acidic side
- alkali metal compounds such as potassium hydroxide and the like are used as the pH adjusting agent for the basic side.
- the surfactant is used to improve the dispersibility of the abrasive composition or prevent the wiring metal surface from being roughened after polishing.
- any of an anionic surfactant, a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant may be used.
- the concentration of carbonate ion, hydrogen carbonate ion, sulfate ion, acetate ion, ammonium ion, etc. in the abrasive composition does not change the range force specified in the present invention.
- surfactant examples include anionic surfactants such as polyacrylic acid and alkylbenzene sulfonate; nonionic surfactants such as polyoxyethylene derivatives, polyoxyethylene sorbitan fatty acid esters, and glycerin fatty acid esters.
- anionic surfactants such as polyacrylic acid and alkylbenzene sulfonate
- nonionic surfactants such as polyoxyethylene derivatives, polyoxyethylene sorbitan fatty acid esters, and glycerin fatty acid esters.
- Amphoteric surfactants such as alkyl betaines can be used.
- the abrasive composition of the present invention may contain Sarako and trishydroxymethylamino methane. In that case, the step-resolving property can be further improved.
- the concentration of trishydroxymethylaminomethane is preferably at least O 5 mol / kg, more preferably 0.15-0.35 mol / kg. However, if added in a large amount, the effect of the additive will be saturated, so it is preferable to make it 0.5 mol Zkg or less.
- FIGS. 1 to 3 show an example of a method for producing a wiring board using the abrasive composition according to the present invention.
- the same reference numerals indicate the same parts.
- a wiring groove 2 as an opening is provided at a predetermined portion of the resin base material 1 provided on the support substrate 5 using a laser cutter or the like.
- the resin base material 1 is preferably made of an insulating base material, and is preferably composed of a thermoplastic resin, a thermosetting resin, or a mixture thereof.
- a thermoplastic resin e.g., polyethylene-Rensulfide
- PEEK Polyether Ether Ketone
- PEK Polyether Ketone
- PEI Polyetherimide
- Polyimide e.g., polyimide
- PPS Polyethylene-Rensulfide
- Thermosetting resin such as epoxy resin, polyurethane resin, phenol resin, acrylic resin, etc .
- Thermoplastic resin such as FR 4, FR5, etc.
- a mixture or the like can be used.
- the thickness of the base material is not particularly limited, but for example, it can be formed into a film having a thickness of 50 ⁇ m to 200 ⁇ m.
- a wiring metal 3 is embedded in the wiring groove 2.
- copper is preferably used as the wiring metal 3.
- Copper can be embedded by, for example, using a plating method after forming a copper film as a seed copper by a sputtering method.
- the polishing amount depends on the film thickness of the wiring metal 3. Therefore, in order to improve the throughput, it is important to increase the polishing rate of the wiring metal 3.
- the demand for the flatness of the substrate surface is low as compared with the case where the multilayer wiring is formed on the semiconductor substrate. Therefore, for example, after removing most of the wiring metal at a high polishing rate, the polishing conditions are changed to remove the remaining wiring metal. It can be a one-step polishing that removes all the wiring metal.
- the polishing method is not particularly limited. For example, while holding the back surface of the support substrate with a rotatable polishing head and pressing the surface to be polished (the surface on which the wiring metal is formed) against the polishing pad fixed to the rotatable support base, Polishing while rotating the support table.
- the back surface of the support substrate is fixed on a rotatable support base, and polishing is performed while rotating the support base and the polishing head with the polishing pad attached to the polishing head in contact with the surface to be polished. You can also In these cases, polishing is performed while supplying the abrasive composition according to the present invention between the surface to be polished and the polishing pad.
- polishing can also be performed by providing a cushioning material between the support base and the support substrate so that force S is applied.
- the polishing pad may be provided with channels and supply holes so that the polishing composition is uniformly supplied onto the surface to be polished.
- Examples of the material of the polishing pad include polyester and polyurethane. However, it is preferable to select appropriately according to the abrasive composition to be used.
- the polishing rate can be increased, but the damage to the object to be polished increases.
- the polishing pressure increases, the semiconductor substrate force insulating film may be peeled off. Therefore, it is important to determine the polishing pressure mainly by comparing and considering the polishing rate and the damage to the workpiece.
- a wiring metal such as copper is used as an object to be polished. For this reason, it is possible to determine the polishing pressure in preference to the improvement of the polishing rate, compared to the case of polishing an insulating film or the like. Even under such conditions, in the present invention, polishing is performed using both a mechanical action and a chemical action. Therefore, compared with polishing performed only by mechanical polishing, scratches on the object to be polished are generated. It goes without saying that life can be minimized.
- the abrasive composition of the present invention it is possible to obtain a low polishing speed even at a low polishing pressure.
- the polishing speed can be further increased by increasing the polishing pressure. Is possible.
- a wiring board 4 having the structure of FIG. 3 is obtained.
- cleaning is preferably performed to remove the abrasive component adhering to the surface of the wiring board 4. Cleaning can be performed by scrubbing with a brush or ultrasonic cleaning in addition to cleaning with running water.
- polishing is performed by a chemical and mechanical action, so that the occurrence of scratches on the metal substrate is minimized. be able to. Therefore, in particular, the metal wiring pattern provided on the resin base material is polished. It is suitable for.
- the polishing rate of the wiring metal can be increased, the throughput in the manufacturing process of the wiring board can also be improved. Further, in this case, the polishing rate in the wiring portion and the concave portion is prevented from becoming too fast, so that an increase in wiring resistance can be suppressed and excellent step resolution can be obtained.
- Examples 1, 4 and 5 correspond to the examples, and examples 2 and 3 correspond to the comparative examples.
- Alumina is all average particle size l iim (Wako Pure Chemical Industries)
- a metal wafer having a thickness of 500 ⁇ m and a diameter of 6 inches was used, and a 50 m thick resin base material was laminated on the wafer.
- a wiring groove having a depth of 23 m was formed as an opening on the resin base material.
- a copper film with a thickness of 30 m was formed on this by a plating method. This was used as a pattern wafer for level difference elimination evaluation.
- Polishing was performed under the following conditions. Polishing machine: Strasbaugh polishing machine 6EC
- Polishing pad Mouth Dale IC-1400 K-Groove
- Polishing pad rotation speed Polishing head (wafer holding part) 97rpm, platen (polishing surface plate) 103r pm
- Table 2 shows the results of comparing the polishing rates.
- the polishing rate was determined by polishing the blanket wafer for 60 seconds and measuring the copper film thickness before and after polishing using a film thickness measuring device (RT80-R manufactured by Nabson).
- Example 1 Example 4 and Example 5 which are examples show a decrease in the polishing rate as compared with Examples 2 and 3 which are comparative examples, the polishing rate is still high. I have a lot of power.
- FIG. 4 (a) is a schematic partial cross-sectional view of an object to be polished before polishing.
- FIG. 4 (b) is a schematic partial sectional view of an object to be polished during polishing.
- the substrate surface where the wiring groove is not formed is widened (3a in Fig. 4 (a)), and the adjacent portion is formed with multiple wiring grooves with a depth of 23 ⁇ m (Fig. 4).
- the boundary between (a) and 3b) is shown, and a copper film with a thickness of 30 m is formed on the entire surface.
- the same reference numerals as those in FIGS. 1 to 3 indicate the same parts.
- the scale ratio in the vertical and horizontal directions is changed.
- FIG. 4 (a) shows the evaluation results of the level difference elimination.
- the evaluation is shown in Fig. 4 (a). This was performed by measuring the level difference of three points (level difference 1, 2, 3) of the polishing object with a level difference measuring device (Dectac V200Si manufactured by Veeco).
- the numerical value indicated by the arrow in the line width direction is the distance from the pattern 3a to the measurement point of each step.
- the height of the step is obtained by obtaining a profile near the measurement point of each step, and connecting the bottom of the step corresponding to the wiring groove and the corners of both ends of the step corresponding to the substrate surface at each step measurement point. The difference between and.
- the step that is most difficult to eliminate the step is a step adjacent to a wide and wide portion of the substrate surface where the wiring groove is not formed.
- step 1 that is most difficult to eliminate the step, followed by step 2 and step 3.
- Example 1 which is an example, any stepped portion can be polished in a shorter time than in Examples 2 and 3, which are comparative examples. The difference is eliminated.
- Example 4 is an example of an abrasive composition having a composition not containing trishydroxymethylaminomethane.
- Example 5 is an example of an abrasive composition that does not contain trishydroxymethylaminomethane and contains carbonate ions instead of chlorine ions. This As in Example 1, these steps can be eliminated by short-time polishing at any step.
- the abrasive composition of the present invention can achieve both a high polishing rate for an object to be polished and an excellent level difference elimination property.
- polishing a wiring metal the polishing rate is suppressed while suppressing an increase in wiring resistance. Can be fast.
- polishing method of the present invention since polishing is performed by a chemical and mechanical action, the occurrence of scratches on the wiring metal can be reduced compared to mechanical polishing, which is industrially useful. is there. It should be noted that the entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2006-151477 filed on May 31, 2006 are cited here as disclosure of the specification of the present invention. Incorporate.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Manufacturing Of Printed Wiring (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07744044A EP2027970A4 (en) | 2006-05-31 | 2007-05-24 | POLISHING COMPOSITION AND POLISHING METHOD |
JP2008517882A JPWO2007138975A1 (ja) | 2006-05-31 | 2007-05-24 | 研磨剤組成物および研磨方法 |
US12/277,468 US20090140199A1 (en) | 2006-05-31 | 2008-11-25 | Polishing compound and polishing method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-151477 | 2006-05-31 | ||
JP2006151477 | 2006-05-31 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/277,468 Continuation US20090140199A1 (en) | 2006-05-31 | 2008-11-25 | Polishing compound and polishing method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007138975A1 true WO2007138975A1 (ja) | 2007-12-06 |
Family
ID=38778495
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/060610 WO2007138975A1 (ja) | 2006-05-31 | 2007-05-24 | 研磨剤組成物および研磨方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20090140199A1 (ja) |
EP (1) | EP2027970A4 (ja) |
JP (1) | JPWO2007138975A1 (ja) |
KR (1) | KR20090012309A (ja) |
CN (1) | CN101454121A (ja) |
TW (1) | TW200813201A (ja) |
WO (1) | WO2007138975A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010052990A1 (ja) * | 2008-11-07 | 2010-05-14 | 旭硝子株式会社 | 研磨剤、研磨方法および半導体集積回路装置の製造方法 |
JP2015203080A (ja) * | 2014-04-15 | 2015-11-16 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
JP2020170748A (ja) * | 2019-04-01 | 2020-10-15 | 山口精研工業株式会社 | 窒化アルミニウム基板用研磨剤組成物および窒化アルミニウム基板の研磨方法 |
CN114029511A (zh) * | 2021-11-10 | 2022-02-11 | 成都先进金属材料产业技术研究院股份有限公司 | 钛合金slm成型件支撑结构及其去除方法 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010092865A1 (ja) | 2009-02-16 | 2010-08-19 | 日立化成工業株式会社 | 研磨剤及び研磨方法 |
KR101400585B1 (ko) * | 2009-02-16 | 2014-05-27 | 히타치가세이가부시끼가이샤 | 구리 연마용 연마제 및 이를 이용한 연마 방법 |
JP6272842B2 (ja) * | 2012-06-11 | 2018-01-31 | キャボット マイクロエレクトロニクス コーポレイション | モリブデン研磨のための組成物および方法 |
US20130337725A1 (en) * | 2012-06-13 | 2013-12-19 | 3M Innovative Property Company | Abrasive particles, abrasive articles, and methods of making and using the same |
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- 2007-05-24 JP JP2008517882A patent/JPWO2007138975A1/ja active Pending
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WO2010052990A1 (ja) * | 2008-11-07 | 2010-05-14 | 旭硝子株式会社 | 研磨剤、研磨方法および半導体集積回路装置の製造方法 |
JPWO2010052990A1 (ja) * | 2008-11-07 | 2012-04-05 | 旭硝子株式会社 | 研磨剤、研磨方法および半導体集積回路装置の製造方法 |
CN102210012B (zh) * | 2008-11-07 | 2014-12-17 | 旭硝子株式会社 | 研磨剂、研磨方法和半导体集成电路装置的制造方法 |
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JP2020170748A (ja) * | 2019-04-01 | 2020-10-15 | 山口精研工業株式会社 | 窒化アルミニウム基板用研磨剤組成物および窒化アルミニウム基板の研磨方法 |
JP7220114B2 (ja) | 2019-04-01 | 2023-02-09 | 山口精研工業株式会社 | 窒化アルミニウム基板用研磨剤組成物および窒化アルミニウム基板の研磨方法 |
CN114029511A (zh) * | 2021-11-10 | 2022-02-11 | 成都先进金属材料产业技术研究院股份有限公司 | 钛合金slm成型件支撑结构及其去除方法 |
Also Published As
Publication number | Publication date |
---|---|
CN101454121A (zh) | 2009-06-10 |
KR20090012309A (ko) | 2009-02-03 |
EP2027970A4 (en) | 2009-11-18 |
EP2027970A1 (en) | 2009-02-25 |
US20090140199A1 (en) | 2009-06-04 |
JPWO2007138975A1 (ja) | 2009-10-08 |
TW200813201A (en) | 2008-03-16 |
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