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Boron-containing polishing system and method

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Publication number
WO2003035782A1
WO2003035782A1 PCT/US2002/031945 US0231945W WO2003035782A1 WO 2003035782 A1 WO2003035782 A1 WO 2003035782A1 US 0231945 W US0231945 W US 0231945W WO 2003035782 A1 WO2003035782 A1 WO 2003035782A1
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WO
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Patent type
Prior art keywords
poushing
system
mechanical
chemical
acid
Prior art date
Application number
PCT/US2002/031945
Other languages
French (fr)
Inventor
Renjie Zhou
Steven K. Grumbine
Isaac K. Cherian
Original Assignee
Cabot Microelectronics Corporation
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00Lapping machines or devices; Accessories
    • B24B37/11Lapping tools
    • B24B37/20Lapping pads for working plane surfaces
    • B24B37/24Lapping pads for working plane surfaces characterised by the composition or properties of the pad materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00Lapping machines or devices; Accessories
    • B24B37/11Lapping tools
    • B24B37/20Lapping pads for working plane surfaces
    • B24B37/24Lapping pads for working plane surfaces characterised by the composition or properties of the pad materials
    • B24B37/245Pads with fixed abrasives
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; MISCELLANEOUS COMPOSITIONS; MISCELLANEOUS APPLICATIONS OF MATERIALS
    • C09GPOLISHING COMPOSITIONS OTHER THAN FRENCH POLISH; SKI WAXES
    • C09G1/00Polishing compositions
    • C09G1/02Polishing compositions containing abrasives or grinding agents
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; MISCELLANEOUS COMPOSITIONS; MISCELLANEOUS APPLICATIONS OF MATERIALS
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00Materials not provided for elsewhere
    • C09K3/14Anti-slip materials; Abrasives
    • C09K3/1454Abrasive powders, suspensions and pastes for polishing
    • C09K3/1463Aqueous liquid suspensions
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer, carrier concentration layer
    • H01L21/18Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer, carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/31Treatment 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
    • H01L21/3205Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
    • H01L21/321After treatment
    • H01L21/32115Planarisation
    • H01L21/3212Planarisation by chemical mechanical polishing [CMP]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10Methods of surface bonding and/or assembly therefor
    • Y10T156/1002Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1051Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina by folding

Abstract

The invention provides a chemical-mechanical polishing system comprising an abrasive, a carrier, andeither boric acid or a conjugate base thereof, wherein the boric acid and conjugate base are not presenttogether in the polishing system in a sufficient amount to act as a pH buffer, or a water-solubleboron-containing compound or salt thereof that is not boric acid, and a method of polishing a substrateusing the chemical-mechanical polishing system.

Description

BORON-CONTAINING POLISHING SYSTEM AND METHOD

FIELD OF THE INVENTION [0001] This invention pertains to boron-containing polishing systems and methods for their use in the chemical-mechanical polishing ("CMP") of a substrate.

BACKGROUND OF THE INVENTION [0002] Compositions and methods for planarizing or polishing the surface of a substrate are well known in the art. Polishing compositions (also known as polishing slurries) typically contain an abrasive material in an aqueous solution and are applied to a surface by contacting the surface with a polishing pad saturated with the slurry composition. Typical abrasive materials include silicon dioxide, cerium oxide, aluminum oxide, zirconium oxide, and tin oxide. U.S. Patent 5,527,423, for example, describes a method for chemically- mechanically polishing a metal layer by contacting the surface with a polishing slurry comprising high purity fine metal oxide particles in an aqueous medium. Alternatively, the abrasive material may be incorporated into the polishing pad. U.S. Patent 5,489,233 discloses the use of polishing pads having a surface texture or pattern, and U.S. Patent 5,958,794 discloses a fixed abrasive polishing pad.

[0003] Conventional polishing systems and polishing methods typically are not entirely satisfactory at planarizing semiconductor wafers. In particular, polishing compositions and polishing pads can have less than desirable polishing rates, and their use in chemically- mechanically polishing semiconductor surfaces can result in poor surface quality. Because the performance of a semiconductor wafer is directly associated with the planarity of its surface, it is crucial to use a polishing composition and method that results in a high polishing efficiency, uniformity, and removal rate and leaves a high quality polish with minimal surface defects.

[0004] The difficulty in creating an effective polishing system for semiconductor wafers stems from the complexity of the semiconductor wafer. Semiconductor wafers are typically composed of a substrate, on which a plurality of transistors has been formed. Integrated circuits are chemically and physically connected into a substrate by patterning regions in the substrate and layers on the substrate. To produce an operable semiconductor wafer and to maximize the yield, performance, and reliability of the wafer, it is desirable to polish select surfaces of the wafer without adversely affecting underlying structures or topography. In fact, various problems in semiconductor fabrication can occur if the process steps are not performed on wafer surfaces that are adequately planarized.

[0005] The use of acids in chemical-mechanical polishing compositions is commonly known in the art. For example, U.S. Patent 5,858,813 describes a polishing composition comprising an aqueous medium, an abrasive, an oxidizing agent, and an organic acid, which purportedly enhances the selectivity of metal to oxide poUshing rate. U.S. Patent 5,800,577 describes a polishing composition comprising a carboxylic acid, an oxidizing agent, and water with the pH adjusted with an alkali metal to between 5 and 9. U.S. Patent 5,733,819 describes a poUshing composition comprising silicon nitride fine powder, water, and an acid. U.S. Patent 6,048,789 describes a poUshing composition comprising nitric and hydrofluoric acids for etching silica.

[0006] Acid buffers are used to control the pH of a poUshing composition and, thus, maintain the poUshing efficiency and uniformity of the poUshing composition over time. For example, U.S. Patent 6,190,237 describes a two-step polishing system comprising first step poUshing with an acidic (pH = 1 to 6) poUshing composition followed by second step polishing with a neutral polishing composition comprising an abrasive and a pH buffering component (i.e., an acid or a salt thereof with a base or salt thereof), which purportedly maintains the desired pH of the second composition despite the presence of residual acidic poUshing composition from the first step, thereby preventing the loss of poUshing performance. U.S. Patent 6,238,592 describes a poUshing composition comprising an oxidizer, a passivating agent, a chelating agent, optional abrasive, and an ionic buffer to control pH (e.g., an acid in combination with its conjugate base salt) for use in semiconductor polishing.

[0007] Acids are also employed for cleaning semiconductor surfaces after completion of CMP. For example, U.S. Patent 6,169,034 describes a method of removing abrasive particles from a semiconductor surface after CMP using a dilute acidic solution without buffing or scrubbing. U.S. Patent 6,143,705 describes the use of a cleaning agent comprising an organic acid with carboxyl groups and a complexing agent with chelating ability.

[0008] A need remains, however, for polishing systems and poUshing methods that wiU exhibit desirable planarization efficiency, uniformity, and removal rate during the poUshing and planarization of substrates, while mmimizing defectivity, such as surface imperfections and damage to underlying structures and topography during polishing and planarization.

[0009] The present invention seeks to provide such a chemical-mechanical poUshing system and method. These and other advantages of the invention will be apparent from the description of the invention provided herein.

BRIEF SUMMARY OF THE INVENTION [0010] The invention provides a chemical-mechanical poUshing system comprising an abrasive, boric acid, or a conjugate base thereof, and an aqueous carrier, wherein the boric acid and conjugate base are not present together in the polishing system in a sufficient amount to act as a pH buffer. The invention also provides a chemical-mechanical poUshing system comprising an abrasive, an aqueous carrier, and a water-soluble boron-containing compound that is not boric acid of formula I- VII as described herein. The invention ftirther provides methods of poUshing a substrate comprising contacting a substrate with one of the chemical-mechanical poUshing systems described herein, and abrading at least a portion of the substrate to poUsh the substrate.

DETAILED DESCRIPTION OF THE INVENTION [0011] The invention is directed to a chemical-mechanical poUshing system comprising an abrasive and/or poUshing pad, an aqueous carrier, and boric acid, or a conjugate base thereof, wherein the boric acid and conjugate base are not present together in the poUshing system in a sufficient amount to act as a pH buffer. The invention is further directed to a chemical-mechanical poUshing system comprising an abrasive and/or poUshing pad, an aqueous carrier, and a water-soluble boron-containing compound that is not boric acid, or salt thereof, of formula I- VII:

V VI VII wherein,

R1, R2, R3, R5, R6, R9, R14, R18, R19, R22, R23, and R24 are independently selected from the group consisting of H, Cι.20 alkyl, C6-3oaryl including polycyclic aryl, cyclo(C3-2o)alkyl, hetero(C6.3o)aryl including polycycUc heteroaryl, C3.20 heterocyclyl, C2.2o alkenyl and C2.2o alkynyl,

R4, R7, R8, R10, R11, R12, R13, R15, R16, R17, R20, R21, and R25are independently selected from the group consisting of H, haUde, d-20 alkyl, C6-3o aryl including polycyclic aryl, cyclo(C3-2o)alkyl, hetero(C6-3o)aryl including polycyclic heteroaryl, C3-2o heterocyclyl, C2.2o alkenyl, and C2-2o alkynyl, any two R substituents of a formula can be linked through 1-16 atoms selected from the group consisting of C, N, O, and S to form a cyclic ring, and

R1- R25 are optionaUy substituted with 1-5 substituents independently selected from the group consisting of halide, C^o alkyl C^oalkoxy, thio(Cι_.20)alkyl, C6.3oaryl including polycyclic aryl, C6-3o r(C1-2o)alkyl, C6.3o ar(Cι_.2o)alkoxy, thio(C6-3o)aryl,

cyclo(C3.2o)alkyloxy, hetero(C6-3o)aryl including polycycUc heteroaryl, C3-2o heterocyclyl, heterocyclo(C3.2o)alkyloxy, C2.20 alkenyl C2.20 alkynyl B(OH)(d.2o alkyl), B(OH)(cyclo(Cι.20)alkyl), B(OHχC6.3oaryl), B(OH)(C6_3o heteroaryl), B(OH)2, thiol, hydroxy, hak^Q.^alkyl, halo(Cι.2o)alkoxy, nitro, a ino, Cι_ carboxy, carbo y^.^alkyl, silyl, and siloxy.

[0012] The abrasive (when present and suspended in the aqueous carrier) and either boric acid, or a conjugate base thereof or water-soluble boron-containing compound, or salt thereof, of formula I-NII as described above, as well as any other components suspended in the Uquid carrier, form the poUshing composition of the CMP system.

[0013] The chemical-mechanical poUshing system comprises an abrasive, a poUshing pad, or both. Preferably, the CMP system comprises both an abrasive and a poUshing pad. The abrasive can be any suitable abrasive. The abrasive can be fixed on the poUshing pad and/or can be in particulate form and suspended in the aqueous carrier. The polishing pad can be any suitable poUshing pad.

[0014] The abrasive can be any suitable abrasive, many of which are known in the art. For example, the abrasive particles can be natural orsynthetic and include diamond (e.g., polycrystaUine diamond), garnet, glass, carborundum, metal oxide (e.g., siUca, fused alumina, ceramic alumina, chromia, and iron oxide), and the like. The abrasive particles can be coated particle abrasives. The abrasive preferably is a metal oxide abrasive and more preferably is selected from the group consisting of alumina, silica, titania, ceria, zirconia, germania, magnesia, co-formed products thereof, and combinations thereof. Most preferably, the abrasive is alumina or silica.

[0015] When the abrasive is present in the CMP system and is suspended in the liquid carrier (i.e., when the abrasive is a component of the poUshing composition), any suitable amount of abrasive can be present in the polishing composition. Typically, 0.1 wt.% or more (e.g., 0.5 wt.% or more) abrasive wiU be present in the poUshing composition. More typically, 1 wt.% or more abrasive will be present in the polishing composition. The amount of abrasive in the poUshing composition typically will not exceed 30 wt.%, more typically will not exceed 20 wt.% (e.g, will not exceed 10 wt.%).

[0016] An aqueous carrier is used to facilitate the application of the abrasive (when present) and either boric acid, or conjugate base thereof, or water-soluble boron-containing compound, or salt thereof, to the surface of a suitable substrate to be poUshed or planarized. The aqueous carrier can be water alone, can comprise water and a suitable water-miscible solvent, or can be an emulsion. Suitable water-miscible solvents include alcohols such as methanol, ethanol etc. Preferably, the aqueous carrier consists of water, more preferably deionized water.

[0017] The pH of the chemical-mechanical poUshing system of the invention is maintained in a range suitable for its intended end-use. The CMP system desirably has a pH in the range of 2 to aboutl2 depending on the type of substrate to be poUshed. The poUshing system can have a pH of less than 7 (e.g., less than 6, 2 to 5, or 3 to 4.5) or a pH of greater than 7 (e.g., 8 to 14, 9 to 13, or 10 to 12). When the polishing system is used to poUsh a substrate layer comprising copper, the pH preferably is 4 to 8. When the poUshing system is used to poUsh a substrate layer comprising tantalum, the pH preferably is 8 to 11. When the poUshing system for tantalum poUshing further comprises an oxidizer, the pH preferably is 4 to 7. When the poUshing system is used to poUshing a substrate layer comprising tungsten, the pH preferably is 1.5 to 5.

[0018] In one embodiment of the invention, the boric acid, or conjugate base thereof, is present in an amount and under conditions in the chemical-mechanical poUshing system so that it does not function as part of a pH buffering system. Buffering occurs when a weak acid is combined with its conjugate base. For example, the combination of boric acid with a similar molar amount of ammonium tetraborate constitutes a buffered solution, whose pH can be maintained upon introduction of small amounts of strong acid or strong base within a range centered about the pI ,. The inventive chemical-mechanical poUshing system does not contain boric acid in combination with a similar molar amount of its conjugate base, i.e., a borate salt, which together act to buffer the pH of the chemical-mechanical poUshing system. Rather, when boric acid is present (i.e., pH < pK 1), the molar amount of conjugate base ([H2BO3]') is less than 20% the molar amount of boric acid (e.g., less than 10, less than 5%). When [H2BO3]" is present (i.e., pK*1 < pH < pKa2) the molar amount of boric acid and [HBO3]2" is less than 20% the molar amount of [H2BO3]" (e.g., less than 10%, less than 5%). FinaUy, when a salt of the conjugate base, [HBO3]2", is present (i.e., pH > pK ) the molar amount of [H2BO3]" is less than 20% the molar amount of [HBO3]2" (e.g., less than 10%, less than 5%).

[0019] In another embodiment of the invention, a water-soluble boron-containing compound, or salt thereof of formula I-NII, as described above, is present in the chemical- mechanical poUshing system, with the proviso that the water soluble boron-containing compound is not boric acid or a salt thereof. When the water-soluble boron-containing compound is a salt, the counterion can be any suitable countercation. For example, the countercation can be ammonium, alkylammonium, di-, tri~, and tetra-alkylammoniun, potassium, cesium, and the like. The choice of countercation will depend on the type of substrate being poUshed and solubility in the Uquid carrier. The compounds of formula I- VII include, for example, trialkylborates, triarylborates, boronic acids, diboronic acid, boronic acid esters, borinic acids, diborinic acid, borinic acid esters, tetraalkylborate salts, and tetraarylborate salts. Preferably, the water-soluble boron-containing compound is a trialkylborate (e.g., trimethylborate), borinic acid ester (e.g., diphenylboronic acid diethanolamine ester), boronic acid (e.g., phenylboronic acid), boronic acid ester (e.g., arylboronic acid-pinaco ester), or tetraarylborate salt (e.g., tetrabutylammonium tetraphenylborate). More preferably, the water-soluble boron-containing compound is a benzodioxaborole compound. Most preferably, the water-soluble boron-containing compound is 5-bromocatecholborane. The water-soluble boron-containing compounds of the present invention can be generated in situ, for example, by a combination of boric acid with an appropriate alcohol, diol, carboxylic acid, or dicarboxylic acid or by a combination of a diboron ester (e.g., diboron pinacol ester or diboron catchol ester) with an appropriate organic compound (e.g., an aryl halide).

[0020] The chemical-mechanical poUshing system optionally further comprises an oxidizing agent. The oxidizing agent can be any suitable oxidizing agent. Suitable oxidizing agents include inorganic and organic per-compounds, bromates, chlorates, nitrates, chromates, iodates, iron salts (e.g., nitrates, sulfates, EDTA, and citrates), alkaline earth and transition metal oxides (e.g., osmium tetraoxide), potassium ferricyanide, potassium dichromate, iodic acid, and the like. Aper-compound (as defined by Hawley's Condensed Chemical Dictionary) is a compound containing at least one peroxy group (-O- O~) or a compound containing an element in its highest oxidation state. Examples of compounds containing at least one peroxy group include but are not limited to hydrogen peroxide and its adducts such as urea hydrogen peroxide and percarbonates, organic peroxides such as benzoyl peroxide, peracetic acid, and di-tert-butyl peroxide, monopersulfates (SO5 2"), dipersulfates (S2O8 2*), and sodium peroxide. Examples of compounds containing an element in its highest oxidation state include but are not limited to periodic acid, periodate salts, perbromic acid, perbromate salts, perchloric acid, perchlorate salts, perboric acid, perborate salts, and permanganates. The oxidizing agent preferably is a peroxide or persulfate.

[0021] The chemical-mechanical poUshing system optionally ftirther comprises a film- forming agent. The film-forming agent can be any suitable film-forming agent. Typically, film-forming agents are organic compounds containing at least one heteroatom (N, O, or S)- containing functional group. For example, the film-forming agent can be a heterocycUc organic compound with at least one 5- or 6-member heterocycle ring as the active functional group, wherein the heterocycle ring contains at least one nitrogen atom (e.g., azoles). Preferably, the film-forming agent is a triazole, more preferably, 1,2,4-triazole or benzotriazole.

[0022] The chemical-mechanical poUshing system optionally ftirther comprises a chelating or complexing agent. Suitable chelating or complexing agents can include, for example, carbonyl compounds (e.g., acetylacetonates, and the like), simple carboxylates (e.g., acetates, aryl carboxylates, and the like), carboxylates containing one or more hydroxyl groups (e.g., glycolates, lactates, gluconates, gaUic acid and salts thereof and the like), di-, tri-, and poly-carboxylates (e.g., oxalates, phthalates, citrates, succinates, tartrates, malates, edetates (e.g., dipotassium EDTA), mixtures thereof, and the like), carboxylates containing one or more sulfonic and/or phosphonic groups, and the like. Suitable chelating or complexing agents also can include, for example, di-, tri-, or polyalcohols (e.g., ethylene glycol, pyrocatechol, pyrogaUol, tannic acid, and the like) and amine-containing compounds (e.g., ammonia, amino acids, amino alcohols, di-, tri-, and polyamines, and the like). Preferably, the complexing agent is a carboxylate salt, more preferably an oxalate salt.

[0023] It will be appreciated that many of the aforementioned compounds can exist in the form of a salt (e.g., a metal salt, an ammonium salt, or the like), an acid, or as a partial salt. For example, citrates include citric acid, as weU as mono-, di-, and tri-salts thereof; phthalates include phthalic acid, as weU as mono-salts (e.g., potassium hydrogen phthalate) and di-salts thereof; perchlorates include the corresponding acid (i.e., perchloric acid), as weU as salts thereof. Furthermore, certain compounds or reagents may perform more than one function. For example, some compounds can function both as a chelating agent and an oxidizing agent (e.g., certain ferric nitrates and the like). [0024] The chemical-mechanical poUshing system optionally further comprises a surfactant. Suitable surfactants can include, for example, cationic surfactants, anionic surfactants, nonionic surfactants, amphoteric surfactants, mixtures thereof, and the like. One preferred sur&ctant is Triton DF-16.

[0025] The chemical-mechanical poUshing system preferably comprises 0.5 wt.% or more carrier-suspended abrasive particles, 0.01 wt.% or more boric acid, conjugate base thereof, or a water-soluble boron-containing compound, or salt thereof, as described herein, and water.

[0026] The chemical-mechanical poUshing systems described herein can be used to poUsh a substrate. The method of poUshing a substrate comprises (i) contacting a substrate with the chemical-mechanical poUshing system, and (u) abrading at least a portion of the substrate to poUsh the substrate. The chemical-mechanical poUshing system desirably is used in a method of poUshing a substrate comprising at least one metal layer and optionaUy an insulating layer, whereby the substrate is contacted with the chemical-mechanical poUshing system and at least a portion of the metal layer or insulating layer (if present) of the substrate is abraded such that the metal layer or insulating layer becomes poUshed. The substrate can be any suitable substrate (e.g., an integrated circuit, memory or rigid disks, metals, ILD layers, semiconductors, micro-electro-mechanical systems, ferroelectrics, magnetic heads, polymeric films, and low and high dielectric constant films) and can contain any suitable insulating, metal or metal alloy layer (e.g., metal conductive layer). The insulating layer can be a metal oxide, porous metal oxide, glass, organic polymer, fluorinated organic polymer, or any other suitable high or low-κ insulating layer. The insulating layer preferably is a silicon-based metal oxide. The metal layer preferably comprises copper, tungsten, tantalum, or titanium.

[0027] The CMP systems of the invention are capable of planarizing or poUshing a substrate at a relatively high rate, with desirable planarization efficiency, uniformity, removal rate, and low defectivity exhibited during the poUshing and planarization of the substrate.

[0028] The foUowing examples ftirther illustrate the invention but, of course, should not be construed as in any way limiting its scope.

EXAMPLE 1 [0029] This example demonstrates the effect on poUshing rate of metal oxide and metal layers resulting from the addition of boric acid to a chemical-mechanical poUshing composition. [0030] Similar substrates comprising copper, tantalum, and silica layers were poUshed with two different chemical-mechanical poUshing systems, each of which comprised the same poUshing pad in conjunction with a different poUshing composition (PoUshing Compositions 1 A and IB). PoUshing Composition 1 A (control) comprised 3 wt.% alumina, 0.7 wt.% ammonium oxalate, 2.5 wt.% hydrogen peroxide, water, and no boric acid with pH adjusted to 7.7 with KOH. PoUshing Composition IB (invention) was the same as PoUshing Composition 1 A (control), except that it also comprised 2 wt.% boric acid. The removal rate for the copper, tantalum, and silica layers of the substrates were measured for each of the chemical-mechanical poUshing systems.

[0031] With respect to the chemical-mechanical poUshing system using PoUshing Composition 1 A (control), the removal rates were determined to be 9085, 160, and 135 A/min, for copper, tantalum, and silica, respectively. With respect to the chemical- mechanical poUshing system using PoUshing Composition IB (invention), the removal rates were determined to be 5140, 497, and 132 A/min, for copper, tantalum, and silica, respectively. Thus, the removal rate for copper substantiaUy decreased, while the removal rate for tantalum substantiaUy increased. The removal rate for silica remained substantiaUy constant.

[0032] These results demonstrate that the poUshing selectivity of tantalum over copper can be substantially increased (~0.02 to ~0.1 Ta Cu) through the use of the inventive chemical-mechanical polishing system. Notably, the substantially higher tantalum poUshing rate observed for the inventive chemical-mechanical poUshing system as compared to the control chemical-mechanical poUshing system was not accompanied by an increase in poUshing rate for the metal oxide layer.

EXAMPLE 2 [0033] This example ftirther demonstrates the effect on poUshing rate of metal oxide and metal layers resulting from the addition of boric acid to a chemical-mechanical poUshing composition.

[0034] Similar substrates comprising copper, tantalum, and silica layers were poUshed with two different chemical-mechanical poUshing systems, each of which comprised the same poUshing pad in conjunction with a different poUshing composition (PoUshing

Compositions 2A and 2B). PoUshing Composition 2A (control) comprised 7.2 wt.% silica,

0.3 wt.% benzotriazole, 20 ppm Triton DF-16 surfactant, 0.37 wt.% potassium persulfate, water, and no boric acid with pH adjusted to 6 with KOH. PoUshing Composition 2B

(invention) was the same as PoUshing Composition 2A (control), except that it also comprised 2 wt.% boric acid. The removal rate for the copper, tantalum, and silica layers of the substrates were measured for each of the chemical-mechanical poUshing systems. [0035] With respect to the chemical-mechanical polishing system using PoUshing Composition 2A (control), the removal rates was determined to be 1360, 356, and 43 A/min, for copper, tantalum, and siUca, respectively. With respect to the chemical- mechanical poUshing system using PoUshing Composition 2B (invention), the removal rates were determined to be 62, 75, and 510 A/min, for copper, tantalum, and siUca, respectively. Thus, the removal rates for copper and tantalum substantially decreased, while the removal rate for siUca substantially increased.

[0036] These results demonstrate that the poUshing selectivity of silica over tantalum and copper can be substantiaUy increased through the use of the inventive chemical- mechanical poUshing system comprising boric acid.

EXAMPLE 3 [0037] This example demonstrates the effect on poUshing rate of metal oxide and metal layers resulting from the addition of a water-soluble boron-containing compound to a chemical-mechanical poUshing composition.

[0038] Similar substrates comprising a copper layer were polished with two different chemical-mechanical poUshing systems, each of which comprised the same polishing pad in conjunction with a different poUshing composition (Polishing Compositions 3 A and 3B). PoUshing Composition 3A (control) comprised 3 wt.% alumina, 0.7 wt.% ammonium oxalate, 2.5 wt.% hydrogen peroxide, water, and no boron-containing compound with pH adjusted to 7.7 with KOH. PoUshing Composition 3B (invention) was the same as PoUshing Composition 3 A (control), except that it also comprised 1 wt.% B- bromocatecholborane. The removal rate for the copper layer of the substrates was measured for each of the chemical-mechanical poUshing systems.

[0039] With respect to the chemical-mechanical poUshing system using PoUshing Composition 3 A (control), the removal rate for the copper layer was determined to be 9085 A/min with 19% within-wafer-non-uniformity (WIWNU). The WIWNU is a percentage calculated by dividing the standard deviation of removal rate by the average removal rate over the substrate and multiplying by 100. With respect to the chemical-mechanical poUshing system using PoUshing Composition 3B (invention), the removal rate was determined to be 12150 A/min with only 7% WIWNU. Thus, the removal rate for copper substantially increased without any loss in poUshing uniformity. In fact, the poUshing uniformity actuaUy improved with the presence of the water-soluble boron-containing compound. [0040] This example demonstrates that the polishing rate of a metal layer can be substantially increased through the use of the inventive chemical-mechanical poUshing system comprising a water-soluble boron-containing compound.

[0041] All references, including publications, patent applications, and patents, cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.

[0042] The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention (especially in the context of the foUowing claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individuaUy to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., "such as") provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.

[0043] Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Of course, variations of those preferred embodiments wiU become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skiUed artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.

Claims

1. A chemical-mechanical poUshing system comprising:
(a) an abrasive and/or polishing pad,
(b) boric acid, or a conjugate base thereofj and
(c) an aqueous carrier, wherein the boric acid and conjugate base are not present together in the poUshing system in a sufficient amount to act as a pH buffer.
2. The chemical-mechanical poUshing system of claim 1 , wherein the abrasive is a metal oxide.
3. The chemical-mechanical poUshing system of claim 2, wherein the abrasive is selected from the group consisting of alumina, silica, titania, ceria, zirconia, germania, magnesia, co-formed products thereof, and combinations thereof.
4. The chemical-mechanical poUshing system of claim 3, wherein the abrasive is alumina or silica.
5. The chemical-mechanical poUshing system of claim 1, wherein the abrasive is fixed on a poUshing pad.
6. The chemical-mechanical poUshing system of claim 1 , wherein the abrasive is in particulate form and is suspended in the carrier.
7. The chemical-mechanical poUshing system of claim 1, wherein the carrier is water.
8. The chemical-mechanical polishing system of claim 1 , wherein the system further comprises an oxidizing agent.
9. The chemical-mechanical poUshing system of claim 8, wherein the oxidizing agent is a peroxide or persulfate.
10. The chemical-mechanical polishing system of claiml , wherein the system further comprises a film-forming agent.
11. The chemical-mechanical poUshing system of claim 10, wherein the film- forming agent is an azole.
12. The chemical-mechanical poUshing system of claim 1 , wherein the system comprises 0.5 wt.% or more carrier-suspended abrasive particles, 0.01 wt.% or more boric acid or conjugate base thereof and water.
13. The chemical-mechanical polishing system of claim 1, wherein the system further comprises a complexing agent.
14. A chemical-mechanical poUshing system comprising:
(a) an abrasive and/or poUshing pad,
(b) an aqueous carrier, and
(c) a water-soluble boron-containing compound that is not boric acid, or salt thereof, of formula I- VII:
IV V VI VII wherein,
R1, R2, R3, R5, R6, R9, R14, R18, R19, R22, R23, and R24 are independently selected from the group consisting of H, Cι„2o alkyl, C6-3oaryl including polycycUc aryl, cyclo(C3.2o)alkyl, hetero(C6-3o)aryl including polycyclic heteroaryl, C3.2o heterocyclyl, C2.20 alkenyl, and C2.20 alkynyl,
R4, R7, R8, R10, R», R12, R13, R15, R16, R17, R20, R21, and R25are independently selected from the group consisting of H, haUde, Cι.2o alkyl, C6-3oaryl including polycyclic aryl, cyclo(C3-2o)alkyl, hetero(C6.30)aryl including polycyclic heteroaryl, C3.20 heterocyclyl, C2.20 alkenyl, and C2.20 alkynyl, any two R substituents of a formula can be linked through 1-16 atoms selected from the group consisting of C, N, O, and S to form a cyclic ring, and
R - R are optionaUy substituted with 1-5 substituents independently selected from the group consisting of halide, Cι.20 alkyl, Cι.20alkoxy, thio(C1.20)alkyl, C6.3oaryl including polycyclic aryl, Ce-so r C^alkyl, C6-3o a^Q.^alko , thio(C6.30)aryl, cyck^d.^alkyl, cyclo(C3-2o)alkyloxy, hetero(C6-3o)aryl including polycyclic heteroaryl, C3.20 heterocyclyl, heterocyclo(C3_.2o)alkyloxy, C2.20 alkenyl, C2.20 alkynyl B(OH)(d.2o alkyl), B(OH)(cyclo(d__2o)alkyl), B(OH)(C6.30aryl), B(OH)(C6-3o heteroaryl), B(OH)2, thiol, hydroxy, halo(C1.20)alkyl, halo(d_.20)alkoxy, nitro, amino, Cι.20 aU^lamino, di(d.2o)alkylamino, amino(Cι_.20)alkyl, d. 2oalkylaιιιino(Cι.2o)alkyl, nitrile, cyano, carbonyl C1.20 alkylcarbonyl, carboxy, carboxy(Cι_2o)alkyl silyl, and siloxy.
15. The chemical-mechanical poUshing system of claim 14, wherein the water- soluble boron-containing compound is atrialkylborate.
16. The chemical-mechanical poUshing system of claim 14, wherein the water- soluble boron-cx>ntaining compound is a borinic acid, boronic acid, borinate ester, or boronate ester.
17. The chemical-mechanical poUshing system of claim 14, wherein the water- soluble boron-containing compound is abenzodioxaborole compound.
18. The chemical-mechanical poUshing system of claim 17, wherein the water- soluble boron-c»ntaining compound is _B-bromocatecholborane.
19. The chemical-mechanical poUshing system of claim 14, wherein the water- soluble boron-c»ntaining compound is a tetraarylborate salt.
20. The chemical-mechanical poUshing system of claim 14, wherein the water- soluble boron-containing compound is generated in situ.
21. The chemical-mechanical poUshing system of claim 14, wherein the abrasive is a metal oxide.
22. The chemical-mechanical polishing system of claim 21 , wherein the abrasive is selected from the group consisting of alumina, silica, titania, ceria, zirconia, germania, magnesia, co-formed products thereof, and combinations thereof.
23. The chemical-mechanical poUshing system of claim 22, wherein the abrasive is alumina or silica.
24. The chemical-mechanical poUshing system of claim 14, wherein the abrasive is fixed on a poUshing pad.
25. The chemical-mechanical polishing system of claim 14, wherein the abrasive is in particulate form and is suspended in the carrier.
26. The chemical-mechanical poUshing system of claim 14, wherein the carrier is water.
27. The chemical-mechanical polishing system of claim 14, wherein the system ftirther comprises an oxidizing agent.
28. The chemical-mechanical polishing system of claim 27, wherein the oxidizing agent is a peroxide or persulfate.
29. The chemical-mechanical poUshing system of claim 14, wherein the system ftirther comprises a film-forming agent.
30. The chemical-mechanical poUshing system of claim 29, wherein the film- forming agent is an azole.
31. The chemical-mechanical poUshing system of claim 14, wherein the system comprises 0.5 wt.% or more carrier-suspended abrasive particles, 0.01 wt.% or more water- soluble boron-containing compound or salt thereof, and water.
32. The chemical-mechanical poUshing system of claim 31 , wherein the abrasive particles are alumina or silica particles, and the water-soluble boron-containing compound is a trialkylborate, borinic acid, boronic acid, borinate ester, or boronate ester.
33. The chemical-mechanical poUshing system of claim 14, wherein the system further comprises a complexing agent.
34. A method of poUshing a substrate comprising:
(i) contacting a substrate with a chemical-mechanical poUshing system comprising:
(a) an abrasive and/or poUshing pad,
(b) boric acid, or conjugate base thereof, and
(c) an aqueous carrier, wherein the boric acid and conjugate base are not present together in the poUshing system in a sufficient amount to act as a pH buffer, and ( ) abrading at least a portion of the substrate to poUsh the substrate.
35. The method of claim 34, wherein the substrate comprises a metal oxide layer and a metal layer.
36. The method of claim 35, wherein the metal layer comprises copper, tungsten, tantalum, or titanium.
37. A method of poUshing a substrate comprising:
(i) contacting a substrate with a chemical-mechanical poUshing system comprising:
(a) an abrasive and/or poUshing pad,
(b) an aqueous carrier, and
(c) a water-soluble boron-containing compound that is not boric acid, or salt thereof, of formula I- VII:
π πi
IV V VI VII wherein,
R1, R2, R3, R5, R6, R9, R14, R18, R19, R22, R23, and R24 are independently selected from the group consisting of H, C^o alkyl, C6-3o aryl including polycyclic aryl, cyclo(C3.2o)alkyl, hetero(C6.30)aryl including polycycUc heteroaryl, C3-20 heterocyclyl, C2-20 alkenyl, and C2.20 alkynyl,
R4, R7, R8, R10, Rπ, R12, R13, R15, R16, R17, R20, R21, and R25are independently selected from the group consisting of H, haUde, d.2o alkyl, C6-3o aryl including polycyclic aryl, cyclo(C3.2o)alkyl, hetero(C6-3o)aryl including polycyclic heteroaryl, C3.2o heterocyclyl, C2.20 alkenyl, and C2-20 alkynyl, any two R substituents of a formula can be linked through 1-16 atoms selected from the group consisting of C, N, O, and S to form a cyclic ring, and R1- R25 are optionaUy substituted with 1-5 substituents independently selected from the group consisting of haUde, .20 alkyl, d^o alkoxy, thio(d_.2o)alkyl, C6-3o ryl including polycyclic aryl, C6-3o r(Cι__2o)alkyl, 5.30 ar(Cι.2o)alkoxy, thio(C6-3o)aryl cyclo(d.20)alkyl, cyclo(C3_.20)alkyloxy, hetero(C6.3o)aryl including polycyclic heteroaryl, C3.2o heterocyclyl, heterocyclo(C3-2o)alkyloxy, C2-20 alkenyl, C2-20 alkynyl B(OH)(d.20 alkyl), B(OH)(cyclo(d_.2o)aikyl), B(OH)(C6.30aryl), B(OH)(C6-30 heteroaryl), B(OH)2, thiol, hydroxy, halo(d..2o)a]kyl halo(d.2o)alkoxy, nitro, amino, d.2oalkylamino, d^d-^alkylamino, amino(d_.2o)alkyl, Ci. 20alkylamino(d__2o)alkyl, nitrile, cyano, carbonyl Cι.2oalkylcarbonyl, carboxy, carboxy(d_.2o)alkyl, silyL, and siloxy, and
(u) abrading at least a portion of the substrate to poUsh the substrate.
38. The method of claim 37, wherein the substrate comprises a metal oxide layer and a metal layer.
39. The method of claim 38, wherein the metal layer comprises copper, tungsten, tantalum, or titanium.
40. The method of claim 37, wherein the water-soluble boron-containing compound is trialkylborate.
41. The method of claim 37, wherein the water-soluble boron-containing compound is a borinic acid, boronic acid, borinate ester, or boronate ester.
42. The method of claim 37, wherein the water-soluble boron-containing compound is a benzodioxoborole compound.
43. The method of claim 42, wherein the water-soluble boron-containing compound is jB-bromocatecholborane.
44. The method of claim 37, wherein the water-soluble boron-containing compound is a tetraarylborate salt.
PCT/US2002/031945 2001-10-24 2002-09-24 Boron-containing polishing system and method WO2003035782A1 (en)

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