WO2004061925A1 - 化学的機械研磨用スラリー組成物、これを利用した半導体素子の表面平坦化方法及びスラリー組成物の選択比制御方法 - Google Patents
化学的機械研磨用スラリー組成物、これを利用した半導体素子の表面平坦化方法及びスラリー組成物の選択比制御方法 Download PDFInfo
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- polishing
- oxide layer
- chemical mechanical
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- 238000005498 polishing Methods 0.000 title claims abstract description 101
- 239000000203 mixture Substances 0.000 title claims abstract description 76
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- 239000000126 substance Substances 0.000 title claims abstract description 38
- 239000004065 semiconductor Substances 0.000 title claims description 18
- 239000000654 additive Substances 0.000 claims abstract description 105
- 230000000996 additive effect Effects 0.000 claims abstract description 103
- 150000004767 nitrides Chemical class 0.000 claims abstract description 82
- 239000002245 particle Substances 0.000 claims abstract description 66
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims abstract description 40
- 125000000129 anionic group Chemical group 0.000 claims abstract description 38
- 239000002270 dispersing agent Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 28
- 238000007517 polishing process Methods 0.000 claims description 10
- 229920005646 polycarboxylate Polymers 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 9
- 229920002125 Sokalan® Polymers 0.000 claims description 8
- 239000004584 polyacrylic acid Substances 0.000 claims description 8
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 7
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical group N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 128
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- 230000000052 comparative effect Effects 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000013459 approach Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 229910052684 Cerium Inorganic materials 0.000 description 3
- 239000003082 abrasive agent Substances 0.000 description 3
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
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- 101100234002 Drosophila melanogaster Shal gene Proteins 0.000 description 2
- 235000015076 Shorea robusta Nutrition 0.000 description 2
- 244000166071 Shorea robusta Species 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- GHLITDDQOMIBFS-UHFFFAOYSA-H cerium(3+);tricarbonate Chemical compound [Ce+3].[Ce+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O GHLITDDQOMIBFS-UHFFFAOYSA-H 0.000 description 2
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
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- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 2
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- 238000012545 processing Methods 0.000 description 2
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- 150000003863 ammonium salts Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 239000012530 fluid Substances 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
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- 238000010297 mechanical methods and process Methods 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- 230000004297 night vision Effects 0.000 description 1
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- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
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- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- 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
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
-
- 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
Definitions
- TECHNICAL FIELD The present invention relates to a slurry composition for chemical mechanical polishing, and more particularly to a slurry composition for chemical mechanical polishing.
- TECHNICAL FIELD The present invention relates to a slurry composition having a high polishing rate selection ratio of an oxide layer to a nitride layer, a method for flattening the surface of a semiconductor device using the same, and a method for controlling the selection ratio of the slurry composition.
- This application is based on Korean Patent Application No. 10-200-2-0 089734, the contents of which are incorporated herein.
- CMP Chemical Mechanical Polishing
- the wafer is polished with a pad and slurry, the polishing table on which the pad is mounted makes a simple rotational movement, and the head part presses at a constant pressure while performing a rotational movement in the opposite direction to the polishing table. .
- the wafer is mounted on the head by vacuum, and the surface of the wafer and the pad are separated by the weight of the head and the applied pressure.
- the slurry which is a machining fluid, flows into the minute gaps between the contact surfaces, and the abrasive particles in the slurry and each protrusion on the pad surface perform a mechanical removal operation.
- the chemical components in the slurry provide a chemical removal action.
- slurry compositions are broadly classified into oxide slurries, metal slurries, and polysilicon slurries according to the types of objects to be polished.
- Oxide slurry is a slurry one used when polishing the interlayer insulating film and STI (Shal low Trench Isolat ion) silicon oxide layer that is used to process (Si0 2 Layer), larger abrasive particles, It is composed of components such as deionized water, pH stabilizer and surfactant.
- abrasive particles is for the effect of polishing mechanically surface under pressure from the polishing machine, mainly silica (Si0 2), ceria (CeO 2), alumina (A1 2 0 3) or the like used.
- ceria slurry is widely used for polishing a silicon oxide layer in an STI process, and in that case, a silicon nitride layer is mainly used as a polishing stopper layer.
- an additive may be added to the cerium slurry in order to improve the selectivity of the polishing rate of the oxide layer to the nitride layer. In this case, not only the removal rate of the nitride layer but also the oxide is removed. The layer removal rate is also reduced, and the selectivity is not substantially improved. Since the ceria slurry is generally larger than the silica slurry, there is a problem that scratches are induced on the wafer surface.
- An object of the present invention is to solve the above-mentioned problems of the prior art.
- polishing is performed with respect to the concentration of an additive and the size (size) of an abrasive.
- a slurry composition according to the present invention for achieving the above object is a chemical mechanical polishing slurry composition for selectively polishing and removing an oxide layer from a nitride layer, comprising: A polishing particle, a dispersant, and an anionic additive, wherein the concentration of the anionic additive is controlled so that a selection ratio of a polishing rate of the oxide layer to the nitride layer is 40: 1 or more. And is added.
- the ceria abrasive particles are preferably polycrystalline particles from the viewpoint of improving the removal rate selectivity.
- the anionic additive for example, water-soluble polyacrylic acid (polyacrylic acid) or water-soluble polycarboxylate (polycarboxylate) can be used.
- a method of flattening a surface of a semiconductor device wherein a step is formed on a surface, and at least a nitride layer is formed on an upper surface of the step.
- the step may be a trench region formed on the surface of the semiconductor substrate, or may be a form in which one side is a protruding portion and a portion in contact with the protruding portion is a concave groove portion.
- the oxide layer may be a silicon oxide layer
- the nitride layer may be a silicon nitride layer.
- the method further includes removing the oxide layer to a predetermined thickness by using a silica slurry until the surface of the nitride layer is exposed. It is possible.
- a method for controlling the selectivity of a slurry composition according to the present invention for achieving still another object according to the present invention includes a method for selectively polishing and removing an oxide layer with respect to a nitride layer.
- the slurry composition includes ceria abrasive particles, a dispersant, and an anionic additive, and the concentration of the anionic additive in the slurry composition.
- the polishing rate selection ratio of an oxide layer with respect to a nitride layer can be improved by adding an anionic additive in a fixed controlled range in a ceria slurry. By changing the concentration, the polishing rate selection ratio of the slurry composition can be controlled as desired.
- FIGS. 1 to 3 are process cross-sectional views illustrating a method for flattening a surface of a semiconductor device according to one embodiment of the present invention.
- FIG. 4 is a graph showing the removal rates of the oxygen-rich film and the nitride film according to the concentration of the additive in the slurry for chemical mechanical polishing according to one embodiment of the present invention.
- FIG. 5 is a graph showing the change in the overnight potential of the ceria slurry according to the present invention and the prior art.
- FIG. 6 is a graph showing the change in zeta potential according to the additive concentration at pH 7.
- FIG. 7 is a graph showing the effect of the additive of the present invention on the size distribution of aggregated particles.
- FIG. 8 is a schematic diagram schematically showing the relationship of selective coating of an abrasive in the slurry composition according to the present invention.
- FIGS. 9A and 9B are diagrams schematically showing the possibility of contact between the ceria abrasive and the oxide film in the slurry composition according to the present invention.
- FIGS. 10A and 10B are diagrams schematically showing the possibility of contact between the ceria abrasive and the nitrided film in the slurry composition according to the present invention.
- FIGS. 11A and 11B are TEM photographs ( ⁇ mode) of the slurry compositions A and B according to the present invention.
- FIGS. 12A and 12B are TEM photographs (bright mode) of the slurry compositions A and B according to the present invention.
- FIG. 13 is a graph showing the removal rate of the oxide film according to the additive concentration for the slurry compositions A and B according to the present invention.
- FIG. 14 is a graph showing the removal rate of the nitrided film according to the additive concentration for the slurry compositions A and B according to the present invention.
- FIG. 15 is a graph showing the change in the overnight potential according to the additive concentration for the slurry compositions A and B according to the present invention.
- FIG. 16 is a graph showing the average particle size according to the additive concentration for the slurry compositions A and B according to the present invention.
- FIG. 17 is a schematic graph for explaining a method for controlling a selectivity between an oxide film and a nitride film in the slurry composition according to the present invention.
- FIG. 18 is a graph showing the measured removal rate of the oxide layer according to the size of the abrasive particles in the slurry composition according to the present invention.
- FIG. 19 is a graph showing the measured removal rate of the nitride layer according to the size of the abrasive particles in the slurry composition according to the present invention.
- FIG. 20 is a drawing modeling the removal rate according to the additive concentration of the material layer to be etched according to the size of the abrasive particles in the slurry composition according to the present invention.
- FIGS. 1 to 3 illustrate a method for applying a surface flattening method for a semiconductor device according to an embodiment of the present invention.
- FIG. 1 is a process cross-sectional view for explaining a STI (Shal low Trench Isolation) process. Referring to FIG. 1, for example, on a substrate (10) made of silicon single crystal,
- a photoresist pattern (not shown) defining a trench region (16) is formed, the nitride layer (14) is etched using the photoresist pattern as an etching mask, and the pad layer (12) and The substrate (10) is etched to a predetermined depth to form a trench region (16).
- the trench region (16) is gap-filled, and an oxide layer (18a) made of silicon oxide is deposited so as to be at a certain height or higher from the surface of the nitride layer (14). Let it.
- a first chemical mechanical polishing process is performed on the oxide layer 18a using a silica slurry composition.
- the reason for using a silica-based slurry is that the polishing efficiency of the oxide layer (18a) having unevenness on the surface is high because the polishing slurry of silica slurry is generally smaller than the polishing slurry of silica slurry. is there.
- a second chemical reaction is performed on the oxide layer (18b) remaining on the nitride layer (14) in FIG. 2 until the surface of the nitride layer (14) is exposed.
- a mechanical polishing step is performed so that the oxide layer (18c) is filled only in the trench region (16).
- the secondary slurry according to the present invention is used in the secondary mechanical polishing step.
- the nitride layer (14) functions as a polishing stopper layer for the oxide layer (18c)
- the selectivity of the polishing rate between the two must be high. If the polishing rate selection ratio between the nitride layer (14) and the oxide layer (18c) is small, the oxide layer (18c) is further polished together with the polishing of the nitride layer (14) throughout the polishing process. Since the dishing phenomenon occurs, the surface cannot be flattened uniformly.
- the removal rate selectivity between oxide and nitride layers is an important factor in determining STI process margins and ultimately yield.
- ceria slurry Compared with silica slurry, which is widely used for polishing an oxide layer, ceria slurry has a higher selectivity of polishing removal rate, but tends to generate scratches on the surface because of the large size of the abrasive.
- the present inventors produced a slurry composition for chemical mechanical polishing in which the selectivity of the removal rate of the oxide layer relative to the nitride layer was large, and the concentration of the additive in these slurry compositions was determined.
- the following experiments and measurements were conducted to examine the change and the change in the selectivity of the polishing removal rate according to the size (size) of the abrasive. First, an 8 "silicon wafer was prepared.
- a PE TEOS (Plasma Enhanced Tetra-Ethy-Ortho-Si icate) film was formed by chemical vapor deposition as an oxide film, and the nitride film was formed at a low pressure. These layers were formed by chemical vapor deposition (LPCVD) to have thicknesses of 7000A and 1500A, respectively.
- LPCVD chemical vapor deposition
- the polishing of these oxide films and nitride films was performed using a single polishing head and a Strasrasugh 6EC having a polishing platen.
- the pad used was an I Cl OOO / SubalV pad from Rodel, and the polishing pressure applied as the down force was 4 psi (po unds per square inch), and the knock pressure was (backpressure) set to f 0.
- the rotation speed of the head and the table was set to 70 rpm, the relative speed between the pad and the wafer was set to 250 fpm (feet per minut e), the slurry flow rate was set to lOOcmVmin, and the polishing was performed.
- the time was set to 30 seconds.
- Ex-si tu conditioning was performed, and the thickness of the film before and after the CMP was measured using Nanospec 180 manufactured by NAN0 Metrics Co., Ltd.
- the selectivity of ceria slurry was improved as the slurry composition according to the present invention. For this reason, anionic additives were added to commercially sold ceria slurries In the present invention, various types of anionic organic additives including water-soluble polyacrylic acid can be used.
- a water-soluble polycarboxylate was used, and the slurry to which the polycarboxylate was added was diluted with deionized water to obtain a slurry.
- the solid content (sol id loading) of the abrasive was adjusted to 1% by weight.
- the hydrogen ion exponent (pH) of Ceria Slurry was 7.1.
- the electrodynamic behavior of the suspension was observed with ESA-8000 of Metec Applied Science, and the surface potential of ceria abrasive, oxide film and nitride film was measured by ELS-800 of Otsuka Electronics Co., Ltd. Was measured.
- the cerium abrasive has a more polyhedral shape than the fumed silica abrasive is generally spherical.
- the polyhedral shape allows for a potential acceleration of the removal rate to allow for plane-contact, rather than point contact, of spherical humic silica abrasives.
- the primary particle size of the ceria abrasive was about 20 to 50 nm, and from the SEM photograph, the secondary particle size of the ceria abrasive was about 400 ⁇ m.
- the contrast due to Bragg diffraction in the TEM image indicates that silica abrasive has a crystalline structure, whereas silica abrasive has an amorphous structure.
- X-ray diffraction profile for abrasive indicating that the ceria abrasive has a CeO 2 of Furuoraito (f luori te) structure.
- FIG. 4 is a graph showing the measured removal rates of the oxide film and the nitride film according to the concentration of the additive in the slurry for chemical mechanical polishing according to one embodiment of the present invention. From Fig. 4, it can be seen that the selectivity of oxide removal rate to nitride of the seri- al slurry without additives is 4.8. On the other hand, although not shown in FIG. 4, in the case of the silica slurry, the oxide removal rate and the nitride removal rate were 1879 A / min and 467 A / min, respectively, and the selectivity was 4.0. It can be said that this fact indicates that in the absence of an additive, the cell abrasive cannot significantly contribute to the improvement of the selectivity.
- the removal rate of ceria slurry is lower than that of silica slurry.
- the reason for this is thought to be due to the possibility of surface contact of the ceria slurry and the direct chemical reaction with Ce-0-Si bonds between the oxide layer and the ceria abrasive.
- the removal rate of the oxide layer gradually decreases as the additive concentration increases, whereas the removal rate of the nitride layer is around 10% when the additive concentration is around (near the arrow). It can be seen that it decreases rapidly.
- Fig. 5 is a graph showing the change in the overnight potential of ceria slurry, where the horizontal axis is ESA (Elec trokinetic). Sonic Amplitude) value, which is a closely related measurement value that represents the same signal as the zero-potential.From Fig. 5, ceria slurry, dispersant and polycarboxylate according to the present invention, etc.
- Fig. 6 shows the dependence of the additive concentration at pH 7.
- Fig. 6 is a graph showing the change in the potential over time The part indicated by an arrow in Fig. 6 corresponds to the part indicated by an arrow in Fig. 4, and the removal rate of the nitride layer changes rapidly.
- Fig. 7 is a graph showing the effect of the additive of the present invention on the aggregated particle size distribution in Fig. 7.
- Agent Addition Agent: Indicates ON water, and the figures in parentheses indicate the additive concentration (%).
- the additive used was water-soluble polyacrylic acid, the horizontal axis shows the diameter of the aggregated particles, and the vertical axis shows the mean difference fraction (MDF) value indicating these distributions. From Fig.
- the particle size of the agglomerated abrasive remains almost unchanged during the dilution of the additive concentration from 20% to 0, and thus the particle size distribution of the condensed abrasive is:
- the high selectivity of the oxide layer over the nitride layer cannot be explained.
- FIG. 8 is a schematic diagram schematically showing a selective coating relationship between an additive and an abrasive in the slurry composition according to the present invention.
- a silicide layer (52) is formed on the surface of a block portion of a substrate (50) having irregularities, and a silicon oxide layer (54) is formed in a trench region therebetween. Have been.
- the surface of the silicon nitride layer (52) has an anionic additive (56) on the silicon oxide layer (54) because of its positive potential.
- the selective coating of an anionic additive (56) on such a silicon nitride layer (52) is more coated on the surface.
- 9A and 9B are diagrams schematically showing the possibility of contact between a cell abrasive and an oxide film in the slurry composition according to the present invention, and FIG. 9A shows a case where the concentration of the additive is relatively low.
- FIG. 9B shows the case where the concentration of the additive is relatively high. Referring to FIGS.
- FIG. 9A where the concentration of the additive is relatively low, the possibility that the abrasive (64) contacts the oxide layer (60) is high because the effective thickness “ ⁇ ⁇ 1” is low. 9), the concentration of the additive is relatively high, and in the case of Fig. 9B, the effective thickness “H2” is high, so the possibility of contact between the abrasive (64) and the oxide layer (60) is high. The removal rate of the oxide layer (60) is low.
- 10A and 10B are diagrams schematically showing the possibility of contact between the ceria abrasive and the nitride film in the slurry composition according to the present invention, and FIG.10A shows the case where the concentration of the additive is relatively low.
- FIGS. 10A and 10B shows the case where the concentration of the additive is relatively high.
- a relatively low effective thickness “H1” formed by the adsorption of a low concentration of anionic additive, respectively, on the surface of the nitride layer (70) is shown.
- a protective layer (72a) having a relatively high effective thickness “H2” formed by adsorption of a high concentration of an anionic additive is formed.
- a shear stress (66) is applied to the polishing agent (64) due to the movement of the polishing pad, but the shear stress (66) is applied to the nitride layer (70) compared to the oxide layer (60).
- the effective thickness of the protective layer (72a, 72b) formed on the surface is much larger, the additive concentration is relatively low in Fig. 10A and the additive concentration is relatively high in Fig. 10B.
- the possibility of contact between the abrasive (64) and the nitride layer (70) is low, and the polishing removal rate of the nitride layer (70) is reduced.
- the present inventors conducted the following experiments and measurements in order to examine the effect of the size (size) of the abrasive particles on the polishing removal rate selectivity of the oxide layer relative to the nitride layer.
- Two types of ceria abrasives were prepared.
- slurry A a slurry containing such a ceria abrasive formed by sol id-state di splacement reac tion method using cerium carbonate as a starting material
- slurry B a slurry containing ceria abrasive formed by the ion method.
- FIG. 11A and 11B show a slurry according to the present invention, in which a water-soluble polycarboxylate, which is a water-soluble additive, was added and diluted with deionized water so that the solid content of the cell abrasive was 1% by weight.
- Compositions A and B Fig. 11A and Fig. 11B show that Slurry B is composed of single crystal particles with a size of 40 to 60 nm, and that Slurry A has a size of 100 nm or more.
- 12A and 12B are TEM photographs (night vision) of the slurry compositions A and B according to the present invention. Field).
- FIG. 13 is a graph showing the removal rate of an oxide film according to the additive concentration for the slurry compositions A and B according to the present invention. As can be seen from Fig. 13, when no additive is used, the oxide film removal rate of slurry B is only about half that of slurry A.
- FIG. U is a graph showing the removal rate of the nitride film according to the additive concentration for the slurry compositions A and B according to the present invention. From Figure 14, it can be seen that in the absence of the additive, the removal rate ratio of the oxide layer to the nitride layer was 5: 1 for both slurries A and B, which is the same as a typical silica slurry.
- FIG. 15 is a graph showing the change in the overnight potential of the particles according to the additive concentration for the slurry compositions A and B according to the present invention. From FIG. 15, it can be seen that the slurry A and the slurry B have almost no difference in the potential value over time at any additive concentration within the experimental range. Since the electrophoretic potential on the membrane surface is independent of the particle properties, it is considered that the electrostatic interaction between the particles and the membrane surface in the slurries A and B is almost the same.
- FIG. 16 is a graph showing the average particle size according to the additive concentration for the slurry compositions A and B according to the present invention. From FIG. 16, the measured particle size of slurry B was about 130 to 170 belly and did not show a large change in the entire concentration range of the additive tested. Increases from 150 nm to 300 nm with increasing additive concentration. By comparing FIG. 11A and FIG. 11B, it can be seen that the abrasive is somewhat agglomerated in the slurry, and that the abrasive in slurry B during polishing is smaller than the abrasive in slurry A.
- Figure 18 shows the removal rate of the oxide layer according to the additive concentration for four types of slurry compositions Al, A2, A3 and A4 having different abrasive particle sizes (sizes). This is a graph, and FIG. 19 is a graph showing the measured removal rates of the nitride layer.
- the slurry compositions Al, A2, A3 and A4 all use a seria abrasive formed by a solid-phase displacement reaction method using cerium carbonate as a starting material, and the size of the abrasive particles is one size.
- A1 is about 290 nm
- Slurry A2 is about 148 nm
- Slurry A3 is about 81.5 nm
- Slurry A4 is about 71.7 mn.
- the size of the abrasive particles can be controlled by the milling time of the mechanical milling process.
- polymethacrylic ammonium salt is used as a dispersant
- polyacrylic acid is used as an anionic organic additive. It was added at various concentrations: 025, 0.05, 0.075, 0.1, 0.2, 0.4, 0.6 and 0.8 wt%.
- the pH of the slurry was adjusted to 7 by diluting with deionized water to lw the solids content of the ceria abrasive (sol id 1 oading). Referring to FIG.
- FIG. 20 is a diagram modeling the change in removal rate according to the additive concentration for a slurry having relatively large abrasive particles and relatively small abrasive particles.
- X represents the case of relatively large abrasive particles
- Y represents the case of relatively small abrasive particles.
- region (i) which has a relatively low additive concentration, not only large abrasive particles but also small abrasive particles are formed because the thickness of the protective layer formed by the additive adsorbed on the surface of the layer to be polished is small. It is easy to approach the surface and the removal speed is high.
- the thickness of the protective layer is about intermediate, so that large abrasive particles can easily approach the surface, while small abrasive particles can The removal rate is large for large abrasive particles, but very slow for small abrasive particles because it is not easy to access.
- the thickness of the protective layer is very large, so that not only small abrasive particles but also large abrasive particles approach the surface of the layer to be polished. It can be seen that all removal rates are low because of the difficulty of removal.
- both the large abrasive particles and the small abrasive particles are oxidized. It comes into direct contact with the surface of the material layer and nitride layer and contributes to the polishing removal of the surface.
- concentration of the additive increases, the amount of the additive adsorbed on the film surface increases, and small abrasive particles are closer to the film surface than large abrasive particles. It becomes difficult to do.
- FIG. 17 is a schematic graph for explaining a method for controlling a selectivity between an oxide film and a nitride film in the slurry composition according to the present invention.
- A1 shows the change in the polishing removal rate for the oxide film layer of the reference slurry according to the change in the concentration of the additive
- B1 shows the polishing removal rate for the oxide layer of the comparative slurry to be used by the operator. It shows a change in speed.
- A2 shows the change in the polishing removal rate for the nitride layer of the reference slurry
- B2 shows the change in the polishing removal rate for the nitride layer of the comparative slurry. From FIG. 17, the selectivity of the removal rate of the oxide layer relative to the nitride layer indicates the ratio of the removal rate of the oxide layer to the removal rate of the nitride layer under the same additive concentration.
- the selectivity of the reference slurry is R2 / R1
- the selectivity of the comparative slurry is R3 / R1.
- the same concentration can be obtained by changing the additive concentration from C2 to C1 for the comparative slurry.
- the selection ratio can be obtained.
- the selectivity of the slurry can be easily controlled to a desired value only by the concentration of the additive.
- the selection ratio of the desired removal rate can be controlled by appropriately selecting the size (size) of the abrasive particles and the concentration of the additive. Of course.
- a polishing rate selection ratio of an oxide layer to a nitride layer is improved by adding an anionic additive to a ceria slurry within a certain controlled range.
- the polishing rate selection ratio of the slurry composition can be controlled as desired by changing the concentration of the additive.
- by controlling the size (size) of the abrasive particles in the cell slurry composition within a certain range it is possible to improve the polishing rate selection ratio of the oxide layer to the nitride layer or the like.
- a desired selection ratio in a certain range can be obtained. Therefore, the dishing phenomenon on the oxide layer is prevented, and the surface is made even and the reliability of the semiconductor element is improved.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2004564534A JPWO2004061925A1 (ja) | 2002-12-31 | 2003-12-25 | 化学的機械研磨用スラリー組成物、これを利用した半導体素子の表面平坦化方法及びスラリー組成物の選択比制御方法 |
EP03786328A EP1580802A4 (en) | 2002-12-31 | 2003-12-25 | CHEMICAL MECHANICAL POLISHING GROWER COMPOSITION, SEMICONDUCTOR ELEMENT SURFACE PLANARIZATION METHOD IN WHICH THE COMPOSITION IS USED, AND METHOD OF ADJUSTING THE SELECTION RATE OF SAID COMPOSITION |
AU2003296130A AU2003296130A1 (en) | 2002-12-31 | 2003-12-25 | Slurry composition for chemical mechanical polishing, method for planarization of surface of semiconductor element using the same, and method for controlling selection ratio of slurry composition |
CN2003801078253A CN1748292B (zh) | 2002-12-31 | 2003-12-25 | 化学机械研磨用浆料组合物、利用它的半导体元件的表面平坦化方法以及浆料组合物的选择比控制方法 |
US10/540,992 US20060246723A1 (en) | 2002-12-31 | 2003-12-25 | Slurry composition for chemical mechanical polishing, method for planarization of surface of semiconductor element using the same, and method for controlling selection ratio of slurry composition |
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KR10-2002-0087934 | 2002-12-31 | ||
KR20020087934 | 2002-12-31 |
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US (1) | US20060246723A1 (ja) |
EP (1) | EP1580802A4 (ja) |
JP (2) | JPWO2004061925A1 (ja) |
KR (1) | KR100578596B1 (ja) |
CN (1) | CN1748292B (ja) |
AU (1) | AU2003296130A1 (ja) |
WO (1) | WO2004061925A1 (ja) |
Cited By (3)
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WO2007046420A1 (ja) * | 2005-10-19 | 2007-04-26 | Hitachi Chemical Co., Ltd. | 酸化セリウムスラリー、酸化セリウム研磨液及びこれらを用いた基板の研磨方法 |
JP2012134343A (ja) * | 2010-12-22 | 2012-07-12 | Lapis Semiconductor Co Ltd | 素子間分離層の形成方法 |
CN103236397A (zh) * | 2013-04-26 | 2013-08-07 | 中国科学院微电子研究所 | 一种化学机械研磨液配置优化的方法 |
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JP2005203394A (ja) * | 2004-01-13 | 2005-07-28 | Nec Electronics Corp | 半導体装置の製造方法 |
JPWO2007015551A1 (ja) * | 2005-08-04 | 2009-02-19 | 旭硝子株式会社 | 研磨剤組成物および研磨方法 |
KR100808588B1 (ko) * | 2005-12-28 | 2008-02-29 | 주식회사 하이닉스반도체 | 반도체 소자의 절연막 매립방법 |
US7837888B2 (en) * | 2006-11-13 | 2010-11-23 | Cabot Microelectronics Corporation | Composition and method for damascene CMP |
JP2010027690A (ja) * | 2008-07-15 | 2010-02-04 | Toshiba Corp | 半導体装置の製造方法 |
US9982177B2 (en) | 2010-03-12 | 2018-05-29 | Hitachi Chemical Company, Ltd | Slurry, polishing fluid set, polishing fluid, and substrate polishing method using same |
KR20130129400A (ko) | 2010-11-22 | 2013-11-28 | 히타치가세이가부시끼가이샤 | 슬러리, 연마액 세트, 연마액, 기판의 연마 방법 및 기판 |
CN103497733B (zh) | 2010-11-22 | 2016-11-23 | 日立化成株式会社 | 悬浮液、研磨液套剂、研磨液、基板的研磨方法及基板 |
SG11201405091TA (en) | 2012-02-21 | 2014-09-26 | Hitachi Chemical Co Ltd | Polishing agent, polishing agent set, and substrate polishing method |
JP6044629B2 (ja) | 2012-02-21 | 2016-12-14 | 日立化成株式会社 | 研磨剤、研磨剤セット及び基体の研磨方法 |
JP5943074B2 (ja) * | 2012-05-22 | 2016-06-29 | 日立化成株式会社 | スラリー、研磨液セット、研磨液及び基体の研磨方法 |
WO2013175854A1 (ja) | 2012-05-22 | 2013-11-28 | 日立化成株式会社 | スラリー、研磨液セット、研磨液、基体の研磨方法及び基体 |
JP5943073B2 (ja) | 2012-05-22 | 2016-06-29 | 日立化成株式会社 | スラリー、研磨液セット、研磨液及び基体の研磨方法 |
CN103231311B (zh) * | 2013-04-26 | 2015-06-10 | 中国科学院微电子研究所 | 一种化学机械研磨液配置优化的方法 |
JP6428625B2 (ja) * | 2013-08-30 | 2018-11-28 | 日立化成株式会社 | スラリー、研磨液セット、研磨液、及び、基体の研磨方法 |
KR101405333B1 (ko) * | 2013-09-12 | 2014-06-11 | 유비머트리얼즈주식회사 | 연마 입자, 연마 슬러리 및 이를 이용한 반도체 소자의 제조 방법 |
JP6646062B2 (ja) * | 2015-11-10 | 2020-02-14 | 信越化学工業株式会社 | 合成石英ガラス基板用研磨剤及びその製造方法、並びに合成石英ガラス基板の研磨方法 |
US11549034B2 (en) * | 2018-08-09 | 2023-01-10 | Versum Materials Us, Llc | Oxide chemical mechanical planarization (CMP) polishing compositions |
KR20210018607A (ko) * | 2019-08-06 | 2021-02-18 | 삼성디스플레이 주식회사 | 연마 슬러리, 이를 이용한 표시 장치의 제조방법 및 표시 장치 |
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- 2003-12-25 US US10/540,992 patent/US20060246723A1/en not_active Abandoned
- 2003-12-25 EP EP03786328A patent/EP1580802A4/en not_active Ceased
- 2003-12-25 AU AU2003296130A patent/AU2003296130A1/en not_active Abandoned
- 2003-12-25 CN CN2003801078253A patent/CN1748292B/zh not_active Expired - Lifetime
- 2003-12-25 WO PCT/JP2003/016813 patent/WO2004061925A1/ja active Application Filing
- 2003-12-25 JP JP2004564534A patent/JPWO2004061925A1/ja active Pending
- 2003-12-29 KR KR1020030099053A patent/KR100578596B1/ko active IP Right Grant
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Also Published As
Publication number | Publication date |
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KR100578596B1 (ko) | 2006-05-12 |
AU2003296130A1 (en) | 2004-07-29 |
KR20040062406A (ko) | 2004-07-07 |
CN1748292A (zh) | 2006-03-15 |
EP1580802A4 (en) | 2007-03-28 |
AU2003296130A8 (en) | 2004-07-29 |
JP2011151405A (ja) | 2011-08-04 |
CN1748292B (zh) | 2010-09-01 |
JPWO2004061925A1 (ja) | 2006-05-18 |
EP1580802A1 (en) | 2005-09-28 |
US20060246723A1 (en) | 2006-11-02 |
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