KR20160135081A - Cmp slurry composition for organic film and polishing method using the same - Google Patents

Abstract

The present invention relates to an organic film CMP slurry composition which comprises at least one among a polar solvent and a nonpolar solvent, a metallic oxide abrasive, an oxidizing agent, and a polyacrylic acid having a molecule weight of 3500 g/mol or less, and polishes an organic film having a carbon content of 50 to 99 atom%, and a polishing method using the same. The CMP slurry composition of the present invention has an excellent polishing effect for an organic film having higher carbon content, film density and hardness, and has a higher speed of polishing the organic film, compared with an inorganic film. The composition has a good flatness of a polishing surface for the organic film after polishing. In addition, the composition easily removes residue of the organic film material existing in a polishing stop layer, thereby enabling more uniform polishing.

Description

Technical Field [0001] The present invention relates to an organic film CMP slurry composition, and a polishing method using the organic film CMP slurry composition.

The present invention relates to an organic film CMP slurry composition and a polishing method using the same.

A semiconductor manufacturing method includes a step of forming an inorganic film such as a silicon oxide film and a silicon nitride film on a patterned silicon wafer and forming a gap-fill via-hole formed in the inorganic film, . The gap-filling process is a process for filling a via-hole with an organic film material, and after the gap-fill process, a process of removing an excess organic film to planarize it must be accompanied. Currently, the flat surface is polished by chemical mechanical polishing (CMP).

Conventional organic film CMP slurry compositions include polymer abrasive grains in order to polish the organic film at a high polishing rate per unit time and to prevent deterioration of the surface state such as scratches. However, since the organic film does not have the same material, when the conventional organic film CMP slurry composition is polished according to the organic film, the flatness of the polished surface is increased, and a desired polishing amount can not be obtained at the same time. However, when a metal oxide polishing agent used for polishing a metal film such as silicon is used for organic film polishing, a desired amount of polishing can not be obtained depending on the organic film, and / or scratches are generated and the flatness of the polishing surface is lowered . The background art of the present invention is disclosed in Korean Patent Publication No. 2007-0057009.

An object of the present invention is to provide an organic film CMP slurry composition excellent in polishing effect on an organic film having high carbon content, film density and hardness.

Another object of the present invention is to provide an organic film CMP slurry composition excellent in the polishing effect against an organic film relative to an inorganic film.

It is still another object of the present invention to provide an organic film having a high carbon content, a high film density and a high hardness and having a good polished surface flatness after polishing and capable of easily removing a residue of an organic film material present in the polish stop film layer Therefore, it is an object of the present invention to provide an organic film CMP slurry composition capable of more uniform polishing.

The organic film CMP slurry composition of the present invention may contain at least one of a polar solvent and a nonpolar solvent; Metal oxide abrasives; Oxidant; And a polyacrylic acid having a molecular weight of not more than 3500 g / mol, and having a carbon content of 50 to 99 atomic%.

The organic film may have a film density of 0.5 to 2.5 g / cm ³ and a hardness of 0.4 GPa or more.

The organic film may have a film density of 1.0 to 2.0 g / cm ³ and a hardness of 1.0 GPa or more.

The metal oxide abrasive may include at least one of silica, alumina, ceria, titania, and zirconia.

The metal oxide abrasive may be contained in an amount of 0.1 to 20% by weight of the composition.

The polyacrylic acid may be included in the composition in an amount of 0.01 to 5% by weight.

The oxidizing agent may include at least one of a metal salt having a polyvalent oxidation state and a chelate of a transition metal.

The oxidizing agent may be included in an amount of 0.001 to 15% by weight of the composition.

The metal salt having the polyvalent oxidation state may include at least one of a seric ammonium salt, ferric nitrate, and ferric chloride.

The organic film may have an acid value of 0 mg KOH / g.

The organic film polishing method of the present invention includes the step of polishing an organic film having a carbon content of 50 to 99 atm%, a film density of 0.5 to 2.5 g / cm ³ and a hardness of 0.4 GPa or more using the organic film CMP slurry composition .

INDUSTRIAL APPLICABILITY The CMP slurry composition of the present invention is excellent in polishing effect against an organic film having a high carbon content, film density and hardness, excellent in polishing speed of an organic film compared to an inorganic film, good in polishing surface flatness after polishing for an organic film, It is possible to easily remove residues of the organic film material present in the polishing stopper film layer, thereby enabling more uniform polishing.

1 is a schematic view of an organic film polishing method according to an embodiment of the present invention.

Organic film CMP slurry composition

The organic film CMP slurry composition of one embodiment of the present invention may comprise at least one of a polar solvent and a nonpolar solvent; Metal oxide abrasives; Oxidant; And polyacrylic acid (PAA). As a result, it is possible to increase the amount of polishing of the organic film to be polished according to the present invention and reduce the polishing amount of the silicon oxide, thereby securing a good selectivity to the organic film.

The polar and / or non-polar solvents reduce friction when polishing an organic film having a high carbon content with a metal oxide abrasive, and can be water such as ultrapure water, organic amines, organic alcohols, organic alcohol amines, organic ethers, For example, ultrapure water can be used. Polar and / or non-polar solvents may be included as balance in the CMP slurry composition.

The metal oxide abrasive can polish an organic film having a high carbon content, film density and hardness at a high polishing amount. In particular, scratches and the like are not generated during the polishing of the organic film to be polished according to the present invention, and the flatness of the polished surface can be increased. Specifically, the metal oxide abrasive may include at least one of silica, alumina, ceria, titania, and zirconia. Particularly, silica may have a better effect of dispersion stability, and ceria may have the effect that there is no oxidizer or extremely low polishing rate.

The metal oxide abrasive may be spherical particles having an average particle size of 10 to 150 nm, for example, 30 to 70 nm. In this range, a sufficient polishing rate can be obtained for the organic film to be polished of the present invention, And the flatness can be increased.

The metal oxide abrasive may be contained in the CMP slurry composition in an amount of 0.1 to 20% by weight, for example, 0.1 to 15% by weight. In this range, a sufficient polishing rate can be obtained for the organic film to be polished of the present invention, And the dispersion stability can be good. Preferably, the average particle diameter of the metal oxide abrasive is high, and by lowering the content in the slurry composition, an improved polishing rate for the organic film and a low polishing rate for the inorganic film can be achieved.

The oxidizing agent oxidizes the surface layer of the organic film so that the organic carbon film having a high carbon content, film density and hardness can be easily polished so that the organic film can be easily polished. When the inorganic film is exposed by polishing, the surface of the organic film is evenly polished The surface roughness can be improved. In addition, the residue of the organic film existing in the inorganic film can be easily removed, so that more uniform polishing can be achieved.

Specifically, the oxidizing agent may include at least one of a metal salt having a polyvalent oxidation state and a chelate compound of a transition metal. The term " multivalent "means a divalent or more, for example, three or more, for example, four or more.

The metal salt having a multi-valent oxidation state can increase the polishing rate for the organic film and lower the polishing rate for the inorganic film. The metal salt may include a metal such as a transition metal or a lanthanide element, and may further include a halogen, an ammonium, a nitrate, and the like. Specifically, the metal salt may include a seric ammonium salt, a ferric halogen salt, a ferric nitrate salt, and the like, and may include, for example, ceric ammonium nitrate, ferric nitrate, ferric chloride, and the like.

The chelate compound of the transition metal can increase the polishing rate for the organic film and lower the polishing rate for the inorganic film.

In the chelate compounds of the transition metals, the transition metals include the commonly known transition metals of group 3 to 12 of the periodic table, for example, iron, copper, manganese or chromium. The chelate may be selected from the group consisting of oxalic acid, amino-substituted carboxylic acids such as iminodiacetic acid, ethylenediamine disuccinic acid, iminodisuccinic acid, ethylenediaminetetraacetic acid, aminopolycarboxylates such as nitrilotriacetic acid, alpha-amino acids such as glycine, Amino acids), hydroxyl-substituted carboxylic acids (e.g., glycolic acid, lactic acid, and also polycarboxylic acids containing an acid such as malic acid, citric acid, and tartaric acid), phosphonocarboxylic acids, aminophosphonic acids; And combinations of these. For example, the chelate compound of the transition metal may include, but is not limited to, one or more of Mn-containing compounds including Fe-containing compounds including propylene diamine tetraacetic acid-Fe and the like, propylene diamine tetraacetic acid-Mn and the like.

The oxidizing agent may be included in the CMP slurry composition in an amount of 0.001 to 15% by weight, for example, 0.01 to 5% by weight, for example, 0.05 to 3% by weight, and appropriate etchability for the organic film in the above range can be maintained. By making the CMP slurry composition acidic, the stability of the oxidizing agent can be improved, the polishing amount per unit time for the organic film can be increased, the flatness of the polishing surface can be improved, and the polishing selectivity to the inorganic film can be increased.

Polyacrylic acid (PAA) means a polymer compound and a derivative thereof containing a repeating unit represented by the following formula (1) (n is the number of repeating units).

≪ Formula 1 >

(In the above formula (1), n is a repeating unit)

The polyacrylic acid according to one embodiment of the present invention may have a molecular weight of 3,500 g / mol or less. Specifically, the molecular weight of the polyacrylic acid may be 1,000 to 3,000 g / mol or less. It is possible to secure an excellent organic film polishing rate and a high selectivity to the organic film in the molecular weight range.

The polyacrylic acid may be contained in the CMP slurry composition in an amount of 0.01 to 5% by weight, for example, 0.05 to 3% by weight, and an excellent polishing amount and selectivity for the organic film can be ensured within the above range.

The CMP slurry composition may have a pH of 6 or less, for example, 5 or less. For example, by using a pH adjusting agent, the CMP slurry composition of one embodiment of the present invention can be adjusted to the above-mentioned range of pH. The pH adjusting agent may include, but is not necessarily limited to, one or more of, for example, potassium hydroxide, sodium hydroxide, and ammonium hydroxide.

The CMP slurry composition may further comprise a pH adjusting agent as described above to make the pH acidic. The pH adjusting agent may be included in the CMP slurry composition so as to adjust the pH of the entire composition at an appropriate level to further increase the polishing selection ratio for the organic film.

The CMP slurry composition may further comprise additives. For example, the CMP slurry composition may further comprise a damascene promoter as an additive. By further including the polishing accelerator, the polishing rate for the inorganic film can be suppressed, and the polishing selectivity for the inorganic film can be increased. The polishing accelerator may include one or more of organic acids such as malic acid, citric acid, formic acid, glutaric acid, oxalic acid, phthalic acid, succinic acid, tartaric acid, maleic acid and malonic acid. The polishing accelerator may be included in the CMP slurry composition in an amount of 0.02 to 0.5% by weight, and the polishing speed, the dispersion stability of the slurry, and the surface characteristics of the organic carbon film may not be adversely affected.

The CMP slurry composition according to one embodiment of the present invention may have a polishing rate for the organic film of 500 to 1000 Å / min, specifically 500 to 5000 Å / min.

The CMP slurry composition according to one embodiment of the present invention may have a selectivity of 300 or more, specifically 350 to 700,

[Formula 1]

(In the above formula 1,? Is the polishing rate for the organic film and? Is the polishing rate for the silica film layer)

CMP slurry composition polishing target

Hereinafter, the organic film to be polished of the CMP slurry composition of the present invention will be specifically described.

As used herein, the term "substituted or unsubstituted" means that a hydrogen atom of the functional group is substituted with a hydroxyl group, a halogen atom, a thionyl group, a thiol group, a cyano group, a substituted or unsubstituted amino group, a substituted or unsubstituted C1- A substituted or unsubstituted C2 to C30 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C3 to C30 cycloalkenyl group, a substituted or unsubstituted C6 to C30 A substituted or unsubstituted C7 to C30 arylalkyl group, a substituted or unsubstituted C1 to C20 heteroalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkenyl group, A substituted or unsubstituted C2 to C30 heteroaryl group, a substituted or unsubstituted C2 to C30 heteroarylalkyl group, a substituted or unsubstituted C1 to C20 alkylamine group, A substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C6 to C30 aryloxy group, a substituted or unsubstituted C1 to C20 aldehyde group, a substituted or unsubstituted C1 to C40 alkyl ether group, a substituted or unsubstituted A C7 to C20 arylalkylene ether group, a substituted or unsubstituted C1 to C30 haloalkyl group, a functional group containing P, a functional group containing B, or a combination thereof.

In the present specification, the "functional group containing P" may be represented by the following formula A, and the "functional group containing B" may be represented by the following formula B:

≪ Formula (A)

- (O) n- (CH ₂ ) mP (= O) (R) (R ') -

≪ Formula B >

* -B (R) (R ')

(Wherein, in the above formula (A), n is 0 or 1, m is an integer of 0 to 10,

R and R 'are each independently selected from the group consisting of hydrogen, a hydroxyl group, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C3 to C20 cycloalkyl group, A substituted or unsubstituted C1 to C20 alkylsulfonate group, a substituted or unsubstituted C1 to C20 alkylsulfonyl group, a substituted or unsubstituted C2 to C20 alkylamido group, a substituted or unsubstituted C2 to C20 alkylsulfonyl group, Substituted or unsubstituted C 3 to C 20 alkyl ester groups, substituted or unsubstituted C 2 to C 20 cyanoalkyl groups, substituted or unsubstituted C 1 to C 20 alkoxy groups, substituted or unsubstituted C 6 to C 30 aryl groups, substituted Or an unsubstituted C6 to C30 arylalkyl group, a substituted or unsubstituted C6 to C30 aryloxy group, or

R and R 'are connected to each other to form a substituted or unsubstituted C3 to C20 cycloalkyl group or a substituted or unsubstituted C3 to C20 heterocycloalkyl group.

Preferably, the "functional group containing P" is a functional group containing P and O, for example, -P (═O) (OH) ₂ , -OP (═O) (OH) ₂ , -P (OCH ₂ CH ₃ ) ₂ , -P (= O) (C ₂ H ₄ C ₆ H ₅ ) (OCH ₂ CH ₃ ), and the like, (OH) ₂ , -B (H) (CH ₃ ), and -B (CH ₂ CH ₃ ) ₂ , for example.

When an inorganic film is deposited on a patterned wafer, for example a silicon wafer, the organic film fills the via-holes created. The CMP slurry composition must be able to polish the organic film with a sufficient polishing rate and planarity of the polishing surface in order to planarize the deposited film, so that the residue remaining on the inorganic film after polishing must be removed. The inorganic film may be a film formed of at least one of silicon oxide and silicon nitride, but is not limited thereto.

The organic film may vary greatly in polishing amount per unit time and flatness after polishing depending on the material of the organic film. INDUSTRIAL APPLICABILITY The organic film CMP slurry composition of the present invention is a composition for polishing an organic film having a high carbon content. It is possible to increase the amount of polishing and flatness of the organic film per unit time in the organic film polishing and to easily remove the residue remaining in the inorganic film after polishing have.

The organic film to be polished according to the present invention can not be polished with an organic film CMP slurry composition containing conventional polymer particles because the carbon content, the film density and the degree of curing are relatively high as compared with a conventional organic film. On the other hand, the CMP slurry composition of the present invention can polish the organic film at a high polishing amount per unit time without deteriorating the surface state due to scratches. Specifically, the polishing rate per unit time for the organic film may be 500 Å / min or more, for example, 1,000 Å / min or more, for example, 500 to 5000 Å / min. Can be secured.

In an embodiment, the organic film may have a carbon content of from 50 to 99 atomic%, for example from 65 to 99 atomic% or from 70 to 99 atomic%, for example. In the above range, the metal oxide abrasive may have a high polishing rate and scratch And the flatness of the polishing surface may be high. The organic film may have a film density of 0.5 to 2.5 g / cm ³ , for example, 1.0 to 2.0 g / cm ³ , for example, 1.2 to 1.6 g / cm ^{3. In} this range, High scratches do not occur and the flatness of the polishing surface can be high. The organic film may have a hardness of 0.4 GPa or more, for example, 1.0 GPa or more, for example, 1.3 GPa or more, for example, 1.3 to 1.5 GPa, and the metal oxide abrasive may have a high polishing rate and scratch And the flatness of the polishing surface may be high.

Further, the organic film to be polished of the present invention may have an acid value of substantially 0 mgKOH / g. There has been a problem in that when the organic film to be polished of the present invention is polished with an organic film CMP slurry composition containing a conventional polymeric polishing agent, the polishing rate is lowered. On the other hand, the CMP slurry composition of the present invention can secure the polishing amount per unit time of the organic film applicable to the CMP process. The term "substantially" includes not only the case where the acid value is 0 mgKOH / g but also the case where a slight error is added or decreased at 0 mgKOH / g.

Specifically, the organic film to be polished of the present invention can be prepared by applying a composition including a compound having a substituted or unsubstituted aromatic group on an inorganic film, followed by baking at a high temperature of, for example, 200 to 400 °.

The above-mentioned "compound having a substituted or unsubstituted aromatic group" means a compound which is not decomposed after thermosetting so that an organic film formed from the composition can exhibit a high carbon content. The unsubstituted aromatic group means a single or fused polycyclic aromatic group having 6 to 100 carbon atoms, for example, 6 to 50 carbon atoms, and specifically includes units represented by the following formulas (2-1) to (2-26) can do:

≪ Formula (2-1)

≪ Formula (2-2)

<Formula 2-3>

<Formula 2-4>

<Formula 2-5>

<Formula 2-6>

<Formula 2-7>

<Formula 2-8>

&Lt; Formula 2-9 >

&Lt; Formula 2-10 >

&Lt; Formula (2-11)

<Formula 2-12>

&Lt; Formula (2-13)

<Formula 2-14>

&Lt; Formula (2-15)

<Formula 2-16>

&Lt; Formula 2-17 &

(2-18)

<Formula 2-19>

<Formula 2-20>

&Lt; Formula 2-21 &

<Formula 2-22>

&Lt; Formula 2-23 &

&Lt; Formula 2-24 &

<Formula 2-25>

&Lt; Formula 2-26 &

(Wherein, in the formulas (2-1) to (2-26), Z ¹ to Z ¹⁸ each independently represent a single bond, a substituted or unsubstituted C1 to C20 alkylene group, a substituted or unsubstituted C2 to C20 alkenylene group, A substituted or unsubstituted C2 to C20 alkynylene group, a substituted or unsubstituted C3 to C20 cycloalkylene group, a substituted or unsubstituted C3 to C20 cycloalkenylene group, a substituted or unsubstituted C6 to C20 arylene group, (C = O) -, -NR ^a -, -CR ^b R ^c -, oxygen (O), sulfur (S) or combinations thereof, wherein R ^a to R ^c are each independently selected from the group consisting of A substituted or unsubstituted C1 to C10 alkyl group, a halogen atom, a substituted or unsubstituted C6 to C20 arylene group, a substituted or unsubstituted C2 to C20 heteroarylene group, or a combination thereof)

Hereinafter, examples of a composition for forming an organic film including a compound having a substituted or unsubstituted aromatic group will be described in more detail.

In a first embodiment, the composition for forming an organic film may comprise a substance having a substituted or unsubstituted aromatic group,

(3)

(In the above formula (3), n is 1? N < 190,

R ₁ represents a hydrogen atom, a hydroxyl group, a halogen atom, an allyl group, a thionyl group, a thiol group, a cyano group, a substituted or unsubstituted amino group, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C30 heteroalkyl group , A substituted or unsubstituted C2 to C30 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkyl group, A substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C7 to C30 arylalkyl group, a substituted or unsubstituted C1 to C20 heteroalkyl group, a substituted or unsubstituted C2 to C30 hetero A substituted or unsubstituted C2 to C30 heterocycloalkenyl group, a substituted or unsubstituted C2 to C30 heteroaryl group, a substituted or unsubstituted C2 to C30 hetero A substituted or unsubstituted C1 to C20 alkylamine group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C1 to C30 heteroalkoxy group, a substituted or unsubstituted C6 to C30 aryloxy group, A substituted or unsubstituted C1 to C20 aldehyde group, a substituted or unsubstituted C1 to C40 alkyl ether group, a substituted or unsubstituted C7 to C20 arylalkylene ether group, a substituted or unsubstituted C1 to C30 haloalkyl group, A functional group containing B, or a combination thereof,

R ₂ represents hydrogen, an amino group, a substituted or unsubstituted C1 to C20 alkoxy group, a substituted or unsubstituted C6 to C20 aryloxy group, a dialkylamino group (-NRR ', wherein R and R' A substituted or unsubstituted C1 to C10 alkyl group or a substituted or unsubstituted C6 to C10 aryl group), a hydroxyl group, a halogen atom, an allyl group, a thionyl group, a thiol group, a cyano group, Substituted or unsubstituted C1 to C30 cycloalkyl, substituted or unsubstituted C1 to C30 heteroalkyl, substituted or unsubstituted C2 to C30 alkenyl, substituted or unsubstituted C2 to C30 alkynyl, substituted or unsubstituted C3 to C30 cyclo A substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C3 to C30 cycloalkenyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C7 to C30 arylalkyl group, A substituted or unsubstituted C1 to C20 heteroalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkenyl group, a substituted or unsubstituted C2 to C30 heteroaryl group, A substituted or unsubstituted C1 to C20 alkylamine group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C1 to C30 heteroalkoxy group, a substituted or unsubstituted C1 to C30 heteroaryl group, A substituted or unsubstituted C 1 to C 20 arylalkoxy group, a substituted or unsubstituted C 1 to C 20 aryloxy group, a substituted or unsubstituted C 1 to C 20 aldehyde group, a substituted or unsubstituted C 1 to C 40 alkyl ether group, a substituted or unsubstituted C 7 to C 20 arylalkylene ether group, A C30 haloalkyl group, a functional group containing P, a functional group containing B, or a combination thereof,

R &lt; ₃ &gt; is a substituted or unsubstituted,

/ RTI &gt;

For example, R ₂ may be a substituted or unsubstituted C1 to C10 alkoxy group.

The material containing Formula 3 can increase the carbon content, the film density and the hardness after thermal curing of the organic film composition, and a more detailed method of manufacturing the same can be found in Korean Patent No. 10-0866015.

The composition of the first embodiment may further include at least one of a crosslinking component, an acid catalyst and an organic solvent, in addition to the material containing the above-mentioned formula (3). Specifically, it may contain 1 to 20% by weight of the substance represented by the formula 3, 0.1 to 5% by weight of a crosslinking component, 0.001 to 0.05% by weight of an acid catalyst, and 75 to 98.8% by weight of an organic solvent.

The crosslinking component may be a melamine resin (specifically N-methoxymethyl-melamine resin, N-butoxymethyl melamine resin), methylated or butylated urea resin, amino resin, glycoluril derivative of the following formula A bis-epoxy compound, and a melamine derivative represented by the following formula (6): &lt; EMI ID =

&Lt; Formula 4 >

&Lt; Formula 5 >

(6)

The acid catalyst is selected from the group consisting of p-toluenesulfonic acid monohydrate, pyridinium p-toluenesulfonate, 2,4,4,6-tetrabromocyclohexadienone, benzoinositolate, 2-nitrobenzyltosylate, alkyl Esters. &Lt; / RTI &gt; The organic solvent is not particularly limited as long as it is an organic solvent having sufficient solubility for a compound having a substituted or unsubstituted aromatic group, and examples thereof include propylene glycol monomethyl ether acetate, cyclohexanone and ethyl lactate.

The composition for forming an organic film according to the first embodiment may be coated to a thickness of 500 to 4000A and thermally cured at 200 to 400 DEG C for 10 seconds to 10 minutes to form an organic film, but the present invention is not limited thereto.

In the second embodiment, the composition for forming an organic film may include a substance having a substituted or unsubstituted aromatic group,

&Lt; Formula 7 >

(Wherein R ₄ to R ₉ and X ₁ to X ₆ each independently represent a hydrogen atom, a hydroxyl group, a halogen atom, an allyl group, a thionyl group, a thiol group, a cyano group, a substituted or unsubstituted amino group, A substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C30 heteroalkyl group, a substituted or unsubstituted C2 to C30 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, a substituted or unsubstituted C3 to C30 A substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C3 to C30 cycloalkenyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C7 to C30 arylalkyl group, a substituted Or a substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkenyl group, a substituted or unsubstituted C2 A substituted or unsubstituted C1 to C30 heteroaryl group, a substituted or unsubstituted C2 to C30 heteroarylalkyl group, a substituted or unsubstituted C1 to C20 alkylamine group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C1 to C30 hetero A substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C6 to C30 aryloxy group, a substituted or unsubstituted C1 to C20 aldehyde group, a substituted or unsubstituted C1 to C40 alkyl ether group, a substituted or unsubstituted C7 to C20 arylalkylene ether group , A substituted or unsubstituted C1 to C30 haloalkyl group, a functional group containing P, a functional group containing B, or a combination thereof

n ₁ to n ₆ are each independently in the range of 0 to 2, and _2? n ₁ + n ₂ + n ₃ + n ₄ + n ₅ + n ₆ ?

For example, each of R ₄ to R ₉ independently represents a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, a substituted or unsubstituted C3 to C20 cycloalkyl group, An unsubstituted C3 to C20 cycloalkenyl group, a functional group containing P, or a functional group containing B, for example.

For example, each of X ₁ to X ₆ may independently be a functional group including hydrogen, a hydroxyl group, a substituted or unsubstituted C1 to C20 alkylamine group, an amino group, a functional group containing P,

Is a compound having a substituted or unsubstituted aromatic group and is substantially the same as the organic film composition of the first embodiment except that the substance represented by the formula (7) is used in place of the substance represented by the formula (3). Hereinafter, only the substance represented by Formula 7 will be described.

The substance represented by the formula (7) may be a mixture of two or more compounds having different substituent positions, and may include an aromatic ring having strong absorption in a short wavelength region (e.g., 193 nm, 248 nm) The aromatic group compound of formula (7) may have an average molecular weight of 500 to 4000 g / mol. In the above range, the thickness of the organic film may be realized or a good thin film Can be formed.

The material represented by the above formula (7) can increase carbon content, film density and hardness after thermal curing of the organic film composition. The substance represented by the above formula (7) can be prepared by a conventional method, for example, by reacting coronene with acetyl chloride, benzoyl chloride, naphthoyl chloride, cyclohexanecarbonyl chloride, and reducing It is not limited. For a more detailed manufacturing method, reference is made to Korean Patent No. 10-1311942.

In the third embodiment, the organic film composition may contain a aromatic group-containing polymer selected from the following (i), (ii) and (iii) as a compound having a substituted or unsubstituted aromatic group:

(i) a compound represented by the following formula (8)

(ii) a mixture of a compound represented by the following formula (8) and a compound represented by the following formula (9)

(iii) a compound represented by the following formula (10).

(8)

&Lt; Formula 9 >

&Lt; Formula 10 >

M and n are respectively 1? N <750, 1? M <750, 2? M + n <1500,

R &lt; ₁₀ &gt; is a substituted or unsubstituted,

, &Lt; / RTI &gt;

R ₁₁ represents a hydrogen atom, a hydroxyl group, a halogen atom, a thionyl group, a thiol group, a cyano group, a substituted or unsubstituted amino group, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C30 heteroalkyl group, A substituted or unsubstituted C2 to C30 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C1 to C30 heterocycloalkyl group, A substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C7 to C30 arylalkyl group, a substituted or unsubstituted C1 to C20 heteroalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkyl group, A substituted or unsubstituted C2 to C30 heterocycloalkenyl group, a substituted or unsubstituted C2 to C30 heteroaryl group, a substituted or unsubstituted C2 to C30 heteroaryl group A substituted or unsubstituted C1 to C20 alkylamine group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C6 to C30 aryloxy group, a substituted or unsubstituted C1 to C20 aldehyde group, A substituted or unsubstituted C7 to C20 arylalkylene ether group, a substituted or unsubstituted C1 to C30 haloalkyl group, a functional group containing P, a functional group containing B, or a combination thereof ,

R &lt; ₁₂ &gt; is a substituted or unsubstituted,

, &Lt; / RTI &gt;

R &lt; ₁₃ &gt; is a substituted or unsubstituted,

, &Lt; / RTI &gt;

R ₁₄ is a substituted or unsubstituted,

, &Lt; / RTI &gt;

R ₁₅ is a substituted or unsubstituted,

, &Lt; / RTI &gt;

Each of R ₁₀ , R ₁₃ and R ₁₅ is independently selected from the group consisting of hydrogen, a hydroxyl group, a halogen atom, a thionyl group, a thiol group, a cyano group, a substituted or unsubstituted amino group, a substituted or unsubstituted C1 to C30 alkyl group, A substituted or unsubstituted C1 to C30 heteroalkyl group, a substituted or unsubstituted C2 to C30 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C1 to C30 Substituted or unsubstituted C1 to C20 heteroalkyl groups, substituted or unsubstituted C6 to C30 aryl groups, substituted or unsubstituted C7 to C30 arylalkyl groups, substituted or unsubstituted C1 to C20 heteroalkyl groups, substituted or unsubstituted C3 to C30 cycloalkenyl groups, Or a substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkenyl group, a substituted or unsubstituted C2 to C30 heteroaryl group, A substituted or unsubstituted C1 to C30 alkylamine group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C6 to C30 aryloxy group, a substituted or unsubstituted C1 A substituted or unsubstituted C1 to C40 alkyl ether group, a substituted or unsubstituted C7 to C20 arylalkylene ether group, a substituted or unsubstituted C1 to C30 haloalkyl group, a functional group containing P, Or a combination thereof).

Is substantially the same as the organic film composition of the first embodiment except that the aromatic group-containing polymer is a compound having a substituted or unsubstituted aromatic group in place of the substance represented by the formula (3). Hereinafter, only the aromatic group-containing polymer will be described.

The aromatic group-containing polymer can increase the carbon content, the film density and the hardness after thermal curing of the organic film composition and can be produced by a conventional method. For further details, refer to Korean Patent No. 10-0908601.

In a fourth embodiment, the organic film composition is a compound having a substituted or unsubstituted aromatic group; A substance represented by the above formula (7); May contain two or more kinds of aromatic group-containing polymers selected from (i), (ii) and (iii) above. Is substantially the same as the composition of the first embodiment, except that it contains at least two kinds.

Organic film polishing method

The organic film polishing method of the present invention includes a step of polishing an organic film having a high carbon content, a film density and a degree of hardening by using an organic film CMP slurry composition, and the organic film CMP slurry composition comprises the organic film CMP slurry composition of the present invention example . 1 (a) shows the lamination state of the silicon wafer, the inorganic film, and the organic carbon film before the organic film polishing, in which the silicon wafer 100 is patterned at a negative angle, , An inorganic film 110 is deposited on the silicon wafer 100, an organic carbon film 120 is coated on the inorganic film, and thermosetting is performed at 200 to 400 ° C. In Fig. 1 (a), T represents a virtual abrasive stop line. The organic film CMP slurry composition is applied onto the organic film of FIG. 1 (a), and the polishing pad is provided. Thereafter, the silicon wafer 100 is polished by rotating it and polished until reaching the polishing stop line T, To the abrasive stop line T of Fig.

EXAMPLES The present invention will now be described more specifically with reference to the following examples, but the following examples are for illustrative purposes only and do not limit the scope of protection of the present invention.

Production Example 1

A 2000 ml three-necked flask equipped with a thermometer, condenser, mechanical stirrer and dropping funnel is prepared and immersed in an oil bath at 140 ° C. Heating and stirring by magnet were performed on a hot plate and the cooling water temperature of the condenser was fixed at 40 ° C. 1 mol of 1-methoxypyrrene (220 g) was added to the reactor, followed by the addition of 1.0 mol of 1,4-bismethoxymethylbenzene (138 g), followed by dissolving in 656 g of propylene glycol monomethyl ether acetate. Then, 4.6 g of 0.03 mol of diethyl sulfate was added. The temperature of the reactor was maintained at 130 캜. The molecular weight was measured at certain time intervals during the polymerization to determine the completion time of the reaction. At this time, a sample for measuring the molecular weight was prepared by taking 1 g of the reaction product and quenching it to room temperature. Then, 0.02 g of the reaction product was taken out and diluted with tetrahydrofuran as a solvent so as to have a solid content of 4% by weight. At the completion of the reaction, 0.048 mol of triethanolamine (4.48 g) as a neutralizing agent was added to the reactor to terminate the reaction and stirred. The reaction was then slowly cooled to ambient temperature. The reaction product was diluted with 500 g of propylene glycol monomethyl ether acetate. The solvent was then added to a 2000 ml separatory funnel. 4 kg of a methanol: ethylene glycol mixture of 90:10 g / g ratio was prepared. The synthesized polymer solution was added dropwise to the alcohol mixture under vigorous stirring. The resulting polymer was collected on the bottom of the flask, and the supernatant was stored separately. After removal of the supernatant, methanol of the final reaction product was removed by rotary evaporation under reduced pressure at 60? For 10 minutes.

The molecular weight and the degree of dispersion of the obtained copolymer were measured by GPC under tetrahydrofuran. As a result, a polymer containing a unit having a weight average molecular weight of 4000 g / mol and a dispersion degree of 2.3 represented by the following formula (11) was obtained.

&Lt; Formula 11 >

(Average n = 11, Me is methyl group)

0.8 g of the polymer prepared above, 0.2 g of the crosslinking agent (4) (Powderlink 1174, Cytec Industries Inc.) and 2 mg of pyridinium p-toluenesulfonate were dissolved in 9 g of propylene glycol monomethyl ether acetate and then filtered to form an organic film A composition was prepared.

Example 1

A 5000 Å thick silica film was deposited as a polishing stop film on a patterned wafer having an engraved pattern on its surface and an organic film having a thickness of 2650 Å was formed to fill an engraved pattern formed on the silica film surface. The organic film was prepared by coating the composition for forming an organic film of Production Example 1 on a silica film and thermally curing at 400 占 폚.

The hardness was measured using a Nanoindentor (Hysitron TI 750 Ubi) for a 4700 to 4800 Å thick sample prepared by applying the organic film forming composition of Production Example 1 and thermally curing at 400 to 120 seconds. The tip of the Nanoindentor was loaded into the specimen for 5 seconds, held for 2 seconds, held and then unloaded for 5 seconds, and the hardness was 0.9 GPa. The carbon content of the same specimen was measured using an elemental analyzer (EA1112, Thermo). Specifically, the precise amount of the sample was burned under the coexistence of O ₂ , and the carbon content was measured. The carbon content was 72 atom%. Film densities were measured on the same specimens using an XRR (X-RAY REFLECTIVITY) device (X'Pert PRO, PANalytical). Specifically, a diffraction pattern obtained by irradiating X-rays was compared with a known diffraction pattern, and the film density was 1.4 g / cm ³ . The acid value of the same specimen was measured and the acid value was 0 mgKOH / g.

A CMP slurry composition containing ultrapure water and the components shown in Table 1 below was prepared and polished under the following polishing conditions.

Examples 2-3 and Comparative Examples 1-6

A CMP slurry composition containing the components shown in Table 1 below was prepared and polished under the following polishing conditions.

(1) CMP slurry composition Specification of each component

(A) Metal oxide abrasive: Ceria (SOLVAY) having an average particle diameter of 60 nm was used.

(B) Oxidizing agent: Ferric nitrate (Samseon Pure Chemical Co., Ltd.) was used.

(C) Polyacrylic acid

   (c1) PAA (Aldrich) having a molecular weight of 3,000 g / mol was used.

   (c2) PAA (Aldrich) having a molecular weight of 1,200 g / mol was used.

   (c3) PAA (Aldrich) having a molecular weight of 2,000 g / mol was used.

   (c4) PAA (Aldrich) having a molecular weight of 20,000 g / mol was used.

   (c5) PAA (Aldrich) having a molecular weight of 100,000 g / mol was used.

(c6) PAA (Aldrich) having a molecular weight of 5,000 g / mol was used.

(2) Measurement of polishing conditions, polishing speed and selection ratio

As the polishing pad, a H0800 CMP pad of FUJIBO Corporation was used. The sample was polished for 1 minute at a down pressure of 0.8 psi, a slurry flow rate of 200 mL / min, a table speed of 90 rpm, and a spindle speed of 90 rpm using a 200 mm MIRRA instrument manufactured by Applied Materials (AMAT) The results are shown in Table 1 below. The polished surface flatness was evaluated as to whether or not the CMP slurry composition balanced polishing of the organic film with respect to the inorganic film. After performing polishing as described above, a thin film thickness meter (ST4000, K-MAC) (Unit: Å) of the abrasive film and the standard deviation of the polishing rate (unit: Å / min) from the measured thickness was determined. The selectivity was calculated by the following formula 1 based on the measured polishing rate .

[Formula 1]

(In the above formula 1,? Is the polishing rate for the organic film and? Is the polishing rate for the silica film layer)

(Unit: wt%)

As shown in Table 1, the organic film CMP slurry composition according to the embodiment of the present invention containing polyacrylic acid having a molecular weight of not more than 3,500 g / mol was prepared in the same manner as in Comparative Examples 1 to 3 which did not contain polyacrylic acid, Of the CMP slurry compositions of Comparative Examples 4 to 6 containing polyacrylic acid having a high carbon content, film density and hardness, the polishing rate per unit time was high and the selectivity to the organic film was high.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (11)

A polar solvent, or a non-polar solvent; Metal oxide abrasives; Oxidant; And polyacrylic acid having a molecular weight of 3500 g / mol or less, and having a carbon content of 50 to 99 atom%. The organic film CMP slurry composition according to claim 1, wherein the organic film has a film density of 0.5 to 2.5 g / cm ³ and a hardness of 0.4 GPa or more. The organic film CMP slurry composition according to claim 1, wherein the organic film has a film density of 1.0 to 2.0 g / cm ³ and a hardness of 1.0 GPa or more. The organic film CMP slurry composition according to claim 1, wherein the metal oxide abrasive comprises at least one of silica, alumina, ceria, titania, and zirconia. The organic film CMP slurry composition according to claim 1, wherein the metal oxide abrasive is contained in an amount of 0.1 to 20 wt% of the composition. The organic film CMP slurry composition according to claim 1, wherein the polyacrylic acid is contained in an amount of 0.01 to 5 wt% of the composition. The organic film CMP slurry composition according to claim 1, wherein the oxidizing agent comprises at least one of a metal salt having a polyvalent oxidation state and a chelate of a transition metal. The organic film CMP slurry composition according to claim 1, wherein the oxidizing agent is contained in an amount of 0.001 to 15 wt% of the composition. The organic film CMP slurry composition according to claim 7, wherein the metal salt having a polyvalent oxidation state comprises at least one of a seric ammonium salt, ferric nitrate, and ferric chloride. The organic film CMP slurry composition according to claim 1, wherein the organic film has an acid value of 0 mgKOH / g. A process for polishing an organic film having a carbon content of 50 to 99 atomic%, a film density of 0.5 to 2.5 g / cm ³ and a hardness of 0.4 GPa or more using the organic film CMP slurry composition of any one of claims 1 to 10 Wherein the organic film polishing method comprises:

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