WO2015152152A1 - 半導体基板の研磨方法 - Google Patents
半導体基板の研磨方法 Download PDFInfo
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- WO2015152152A1 WO2015152152A1 PCT/JP2015/059925 JP2015059925W WO2015152152A1 WO 2015152152 A1 WO2015152152 A1 WO 2015152152A1 JP 2015059925 W JP2015059925 W JP 2015059925W WO 2015152152 A1 WO2015152152 A1 WO 2015152152A1
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- polishing
- hydroxyethyl cellulose
- semiconductor substrate
- surface defects
- abrasive grains
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- H10P90/129—
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02002—Preparing wafers
- H01L21/02005—Preparing bulk and homogeneous wafers
- H01L21/02008—Multistep processes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02002—Preparing wafers
- H01L21/02005—Preparing bulk and homogeneous wafers
- H01L21/02008—Multistep processes
- H01L21/0201—Specific process step
- H01L21/02024—Mirror polishing
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- H10P52/00—
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- H10P52/402—
Definitions
- the present invention relates to a method for polishing a semiconductor substrate such as a semiconductor wafer.
- a semiconductor substrate such as a semiconductor wafer (hereinafter also simply referred to as a wafer) is highly flat.
- a high level is required for the reduction of surface defects.
- Patent Document 1 describes a polishing composition containing hydroxyethyl cellulose as a water-soluble polymer.
- a polishing method for polishing a semiconductor substrate is usually employed in multiple stages.
- the surface of the semiconductor substrate is polished flat in the initial polishing such as the first stage and the second stage, and the final polishing is performed for the purpose of more accurate flatness.
- the method for polishing a semiconductor substrate according to the present invention includes an intermediate polishing step for polishing so that the number of surface defects having a height of less than 3 nm on the surface of the semiconductor substrate is 45% or more of the total number of surface defects, and after the intermediate polishing step A final polishing step of final polishing the semiconductor substrate.
- a polishing composition comprising hydroxyethyl cellulose, water, and abrasive grains, wherein the hydroxyethyl cellulose has a molecular weight of 500,000 to 1,500,000, and has a hydroxy content relative to the abrasive grains.
- a polishing composition comprising hydroxyethyl cellulose, water and abrasive grains, wherein the hydroxyethyl cellulose has a molecular weight of 500,000 to 1,500,000 and is adsorbed to the abrasive grains.
- a double-side polishing step for polishing both surfaces of the semiconductor substrate may be provided before the intermediate polishing step.
- hydroxyethyl cellulose, water and abrasive grains may be used, and the hydroxyethyl cellulose may be polished using a polishing composition having a molecular weight of 300,000 to 1,200,000.
- the polishing composition of the present embodiment includes an intermediate polishing step for polishing so that the number of surface defects having a height of less than 3 nm on the surface of the semiconductor substrate is 45% or more of the total number of surface defects, and the intermediate polishing step after the intermediate polishing step. And a final polishing step of finishing polishing the semiconductor substrate.
- the semiconductor substrate polished by the polishing method of this embodiment is a semiconductor substrate such as a silicon wafer for electronic devices that requires removal of fine surface defects having a width and height of several nm.
- the polishing method of this embodiment may include a double-side polishing step for polishing both surfaces of the semiconductor substrate before the intermediate polishing step.
- both surfaces of the semiconductor substrate are polished using a polishing composition containing abrasive grains.
- the number of surface defects having a height of less than 3 nm on the surface of the semiconductor substrate is 45% or more, preferably 70% or more, more preferably 90% or more of the total surface defects.
- the semiconductor substrate is polished as described above. That is, polishing is performed so that the ratio of remaining surface defects other than the relatively small surface defects is small.
- a relatively large surface defect having a height of 10 nm or more, a minute surface defect having a height of less than 10 nm, a minute surface defect having a height of less than 3 nm and a width of 50 to 200 nm, a height of Surface defects of various sizes are mixed, such as minute surface defects with a width of less than 3 nm and a width of 150 to 350 m.
- the height and width of the surface defect referred to in the present embodiment refer to the height and width measured with an atomic force microscope (AFM).
- the number of surface defects referred to in the present embodiment is, for example, the number of surface defects of each size measured using a surface defect inspection apparatus such as a laser microscope (manufactured by MAGICS M5640 Lasertec) of a confocal optical system.
- polishing method of the present embodiment surface defects having a relatively large size are reduced in the intermediate polishing step or the double-side polishing step up to the final polishing step, and minute surface defects are removed in the final polishing step. Further, it is possible to efficiently and accurately reduce the surface defects after the final polishing.
- the presence / absence of surface defects is determined by counting the number of surface defects. Therefore, if there is a defect that can be counted regardless of the size, the count number increases and it is determined that the defect is not reduced.
- the intermediate polishing process if defects having a large size remain even if the count number is small during polishing in the final polishing process, the defects cannot be sufficiently reduced in the final polishing for the purpose of removing minute defects. It will be. Therefore, after performing the intermediate polishing process, it is important not to reduce the number of surface defects, but to remove defects having a size that is difficult to remove by polishing in the final polishing process.
- surface defects having a height of 3 nm or more are selectively removed so that the number of surface defects having a height of less than 3 nm becomes 45% or more of the total surface defects after polishing. Grind. Therefore, in the final polishing step performed after the intermediate polishing step, many surface defects existing in the semiconductor substrate can be removed by removing minute surface defects with a height of less than 3 nm remaining in the semiconductor substrate. Surface defects after the process can be sufficiently reduced.
- the following in order to polish so that the number of surface defects having a height of less than 3 nm is 45% or more of the total number of surface defects, for example, the following may be used as a polishing composition.
- the polishing composition used in the intermediate polishing step of the present embodiment is a polishing composition containing hydroxyethyl cellulose, water, and abrasive grains, and the hydroxyethyl cellulose has a molecular weight of 500,000 to 1,500,000. And those having a mass ratio of the hydroxyethyl cellulose to the abrasive grains of 0.0075 or more and 0.025 or less.
- Hydroxyethyl cellulose having a molecular weight of 500,000 to 1,500,000 is used.
- the molecular weight is in the above range, particularly excellent removability can be exhibited with respect to surface defects of a specific size of the polishing object.
- hydroxyethyl cellulose can improve wettability, but when the molecular weight is in the above range, wettability to a polishing object is improved, and particles on the surface of the polishing object after polishing can be reduced. it can.
- the molecular weight of hydroxyethyl cellulose in the present embodiment refers to a weight average molecular weight measured using a GFC (gel filtration chromatography; GelGFiltration Chromatography) method, and specifically, measured by the measurement method shown in the examples described later. Value.
- GFC gel filtration chromatography; GelGFiltration Chromatography
- Polishing composition contains water. Since the hydroxyethyl cellulose is a hydrophilic polymer, it becomes an aqueous solution easily when mixed with water, and has the effects such as the removal of surface defects of a specific size and the improvement of wettability as described above. Can be demonstrated.
- the water content is not particularly limited and may be appropriately blended.
- the polishing composition When the polishing composition is diluted at the time of use, it may be prepared as a high-concentration liquid having a concentration higher than the desired concentration at the time of use, and water may be blended as a diluent at the time of dilution. .
- Polishing composition contains abrasive grains.
- the abrasive grains include particles made of metal oxides such as silica, alumina, ceria, and titania, silicon nitride particles, silicon carbide particles, and boron nitride particles.
- silica is preferable, and colloidal silica such as true spherical or non-spherical colloidal silica is particularly preferable.
- colloidal silica such as true spherical or non-spherical colloidal silica is particularly preferable.
- the abrasive grains are colloidal silica, as will be described later, it is preferable because the hydroxyethyl cellulose aqueous solution is easily adsorbed and the removability of surface defects of a specific size can be further enhanced.
- non-spherical colloidal silica is preferable.
- non-spherical colloidal silica is more easily adsorbed by an aqueous hydroxyethyl cellulose solution, and can improve the removal of surface defects of a specific size. Therefore, it is preferable.
- the mass ratio of the hydroxyethyl cellulose to the abrasive grains is 0.0075 or more and 0.025 or less.
- the ratio of the content (mass%) of the hydroxyethyl cellulose to the content (mass%) of the abrasive grains in the polishing composition is in the above range, the removability of surface defects of a specific size can be further improved. .
- the wettability of the polished surface of the object to be polished can be improved.
- the content of abrasive grains in the polishing composition of the present embodiment is not particularly limited.
- the content of abrasive grains is 5% by mass or more and 20% by mass or less.
- the particle diameter of the abrasive grains is not particularly limited, and for example, the average particle diameter is 85 nm or more.
- the average particle diameter of the abrasive grains is within the above range, it is preferable because surface defects of a specific size existing on the surface of the object to be polished can be more sufficiently reduced.
- the average particle diameter of the present embodiment is measured using a DSL method (dynamic light scattering method), more specifically, for polishing measured by an apparatus described in the examples described later.
- the average particle diameter in a composition is said. That is, when an abrasive grain forms a cluster in polishing composition so that an abrasive grain may mention later, the average particle diameter of this cluster is said.
- polishing composition has the following interactions by including the said hydroxyethyl cellulose, water, and the said abrasive grain. That is, in the polishing composition, part of hydroxyethyl cellulose is adsorbed on the surface of the abrasive grains such as colloidal silica. Therefore, in the polishing composition, there are hydroxyethyl cellulose adsorbed on the abrasive grains and hydroxyethyl cellulose mixed in the polishing composition without being adsorbed on the abrasive grains. It is considered that when hydroxyethyl cellulose is adsorbed on the abrasive grains, the abrasive grains form clusters due to the action of hydroxyethyl cellulose.
- polishing target object can be improved with the hydroxyethyl cellulose mixed in the polishing composition, without adsorb
- the polishing composition used in the intermediate polishing step of the present embodiment is a polishing composition containing hydroxyethyl cellulose, water, and abrasive grains, and the hydroxyethyl cellulose has a molecular weight of 500,000 to 1,500,000.
- the ratio of hydroxyethyl cellulose adsorbed on the abrasive grains is preferably 45% or more and 90% or less.
- the hydroxyethyl cellulose has a molecular weight of 500,000 to 1,500,000 and the proportion of hydroxyethyl cellulose adsorbed on the abrasive grains is 45% to 90%. It can be adjusted to an appropriate range, and surface defects of a specific size present on the surface of the object to be polished can be sufficiently reduced.
- the ratio of hydroxyethyl cellulose adsorbed on the abrasive grains is% calculated by the following method.
- the supernatant obtained by centrifuging 1.5 mg of the polishing composition at 14000 rpm for 10 minutes, and the amount of TOC (Total Organic Carbon) of the polishing composition were measured.
- the ratio of ethyl cellulose (the ratio (%) of adsorbed hydroxyethyl cellulose) is calculated.
- Ratio of Adsorbed Hydroxyethyl Cellulose (%) (TOC of Polishing Composition ⁇ TOC of Supernatant) / TOC of Polishing Composition (Formula 1)
- the particle diameter of the abrasive grains (clusters) and the ratio of hydroxyethyl cellulose adsorbed on the abrasive grains refer to the particle diameter and the ratio when the polishing composition is used.
- the polishing composition may further contain ammonia.
- ammonia By including ammonia, surface defects of a specific size existing on the surface of the object to be polished can be more sufficiently reduced, which is preferable.
- content of ammonia is not specifically limited, For example, it is 0.1 to 1.0 mass%, Preferably it is 0.25 to 0.75 mass%.
- a content of ammonia in the above range is preferable because surface defects of a specific size existing on the surface of the polishing object can be more sufficiently reduced.
- the pH of the polishing composition can be adjusted to an appropriate range.
- the polishing composition may further contain other components.
- the other components include a pH adjuster, a surfactant, and a chelating agent.
- the polishing composition may be prepared as a high-concentration liquid having a concentration higher than the desired concentration at the time of use, and may be diluted at the time of use. When prepared as such a high concentration liquid, it is convenient for storage and transportation of the polishing composition. When adjusting as a high-concentration liquid, for example, the concentration may be adjusted so that it can be diluted 5 to 100 times, preferably 20 to 60 times, more preferably 21 to 41 times during use. It is done.
- the polishing method of the present embodiment includes a final polishing step of finishing polishing the semiconductor substrate after the intermediate polishing step.
- polishing is performed on a substrate having high flatness without haze or the like while removing relatively small minute defects having a height of less than 3 nm remaining on the surface of the semiconductor substrate after the intermediate polishing step. To do.
- the polishing composition used in the final polishing step is not particularly limited.
- the polishing composition contains hydroxyethyl cellulose, water, and abrasive grains, and the hydroxyethyl cellulose has a molecular weight of 300,000 to 1,200,000. Polishing with an object is mentioned.
- a polishing composition comprising hydroxyethyl cellulose, water, and abrasive grains, wherein the hydroxyethyl cellulose has a molecular weight of 500,000 to 1,500,000, and has a hydroxy content relative to the abrasive grains.
- a polishing composition comprising hydroxyethyl cellulose, water and abrasive grains, wherein the hydroxyethyl cellulose has a molecular weight of 500,000 to 1,500,000 and is adsorbed to the abrasive grains.
- the semiconductor substrate after the final polishing step when the hydroxyethyl cellulose is polished with a polishing composition having a molecular weight of 300,000 to 1,200,000, including hydroxyethyl cellulose, water, and abrasive grains, the semiconductor substrate after the final polishing step Surface defects on the surface can be more sufficiently reduced.
- the surface defects of the semiconductor substrate after the final polishing can be sufficiently reduced.
- Hydroxyethyl cellulose having different molecular weights (500,000, million) shown in Table 1 below was prepared.
- the molecular weight of hydroxyethyl cellulose is a molecular weight measured by the following method.
- the molecular weight is a value of a weight average molecular weight obtained by measurement as follows.
- a GFC device manufactured by JASCO Corporation: PU-2085plus type system
- Asahipak GF-710HQ and GF-310HQ manufactured by Shodex are connected in series, and 0.7% chloride is used as an eluent. Measurement was performed using an aqueous sodium solution.
- polishing by mixing the hydroxyethyl cellulose (HEC), abrasive grains (silicon dioxide produced by sol-gel method, particle size in water: 66 nm by dynamic light scattering method), ammonia and residual water with the composition shown in Table 1 Compositions 1 to 6 were obtained. Each polishing composition was diluted 41 times with water, a silicon wafer (12 inches) as an object to be polished was polished under the following polishing conditions, and the surface defects after polishing were measured by the following method. It is shown in Table 1.
- Polishing device SPP800S (Okamoto Machine Tool) Polishing pad: POLYPAS 24T (Fujibo Atago Co., Ltd.) Surface plate speed: 40 rpm Polishing load: 120 gf / cm 2 Flow rate: 0.6L / min Object to be polished: 12 inch Silicon wafer Polishing time: 300 sec
- the surface defect (Defect) is measured by using a measuring apparatus (MAGICS M5640 (manufactured by Lasertec)) after cleaning the wafer polished under the above polishing conditions with an ammonia / hydrogen peroxide mixed solution (Edge Exclusion EE: 5 mm, Slice level: D37 mV). Based on the coordinates of the defect measured by MAGICS, the defect was measured using a measuring apparatus AFM SAP465 (manufactured by Seiko Instruments Inc.). From the two types of measurement results, surface defects were classified into A to F types by the following method, and the ratio of each surface defect was shown in the graph shown in FIG. Table 1 shows the ratio of each type in%.
- the MAGICS review image classification method was classified into the following A to F types according to the order of the black and white color portions where the defective portion of the review image changes from the left to the right of the image. Note that a bandpass filter was used for analysis of the MAGICS review image. On the MAGICS review image, when the defect is very small (low) due to the influence of the bandpass filter, the color changes three times such as white ⁇ black ⁇ white or black ⁇ white ⁇ black. A defect is analyzed by AFM to determine whether the defect is white ⁇ black ⁇ white, black ⁇ white ⁇ black, and the height is low.
- B type monochrome white
- C type black monochrome
- D type monochrome
- E type black white F type: black
- a type height less than 3 nm, width 50-200 nm, length 200 ⁇ m or more
- B type height less than 3 nm, width 150-350 nm
- C type Height 3nm to less than 10nm
- D type Height 10nm to 30nm
- E type Height 10nm to 50nm
- F type height over 50 nm, width over 150 nm
- the A type is a defect having a flaw-like length component
- B to F are point or irregular defects.
- the ratio of B type surface defects remaining on the polished wafer surface is 45. It turns out that it can be made into% or more. That is, if polishing is performed using a polishing composition that can sufficiently remove surface defects other than the B type in the intermediate polishing step, many surface defects having a size that can be easily removed are left in the substrate in the subsequent final polishing step. Obviously, the surface defects can be sufficiently reduced after the final polishing step.
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Abstract
Description
本実施形態の研磨用組成物は、半導体基板の表面において高さ3nm未満の表面欠陥数が全表面欠陥数の45%以上になるように研磨する中間研磨工程と、前記中間研磨工程の後に前記半導体基板を仕上げ研磨する最終研磨工程とを備える。
本実施形態の研磨方法で研磨される半導体基板は、数nmの幅や高さを有する微細な表面欠陥の除去が要求される電子デバイス用のシリコンウエーハー等の半導体基板である。
本実施形態の研磨方法は、前記中間研磨工程の前に、半導体基板の両面を研磨する両面研磨工程を備えていてもよい。
両面研磨工程では、半導体基板の両面を砥粒を含む研磨用組成物を用いて研磨する。
かかる両面研磨工程を実施することで、半導体基板の比較的サイズの大きい表面欠陥を低減させることができる。
本実施形態の研磨方法において、中間研磨工程は、半導体基板の表面において高さ3nm未満の表面欠陥数が全表面欠陥数の45%以上、好ましくは70%以上、より好ましくは90%以上になるように半導体基板を研磨する。すなわち、前記比較的小さい表面欠陥以外の表面欠陥が残存している割合が少ない状態になるように研磨する。
さらに、本実施形態でいう表面欠陥数とは、例えば、コンフォーカル光学系のレーザー顕微鏡(MAGICS M5640 レーザーテック社製)等の表面欠陥検査装置を用いて測定される各サイズの表面欠陥のカウント数をいう。
しかし、中間研磨工程の実施後、最終研磨工程における研磨時に、カウント数が少なくてもサイズの大きい欠陥が残っていると、微小な欠陥の除去を目的とする最終研磨において十分に欠陥が低減できないことになる。従って、中間研磨工程の実施後には、表面欠陥のカウント数を低減するのではなく、最終研磨工程における研磨で除去しにくいサイズの欠陥を除去することが重要になる。
本実施形態の中間研磨工程で使用する研磨用組成物としては、ヒドロキシエチルセルロースと水と砥粒とを含む研磨用組成物であって、前記ヒドロキシエチルセルロースは分子量が50万以上150万以下であって、前記砥粒に対する前記ヒドロキシエチルセルロースの質量比が0.0075以上0.025以下であるものが挙げられる。
分子量が前記範囲であることにより、研磨対象物の特定のサイズの表面欠陥に対して特に優れた除去性を発揮することができる。
また、ヒドロキシエチルセルロースは、濡れ性を向上させうるが、分子量が前記範囲であることにより、特に、研磨対象物に対する濡れ性が向上し、研磨後の研磨対象物表面のパーティクル等を低減させることができる。
尚、研磨用組成物を使用時に希釈して用いる場合には、使用時の所望の濃度よりも高濃度である高濃度液として調製しておき、希釈時に水を希釈液として配合してもよい。
非真球状コロイダルシリカは、研磨用組成物中でヒドロキシエチルセルロースと共存することによって、後述するように、ヒドロキシエチルセルロース水溶液がより吸着しやすく、特定のサイズの表面欠陥の除去性をより高めることができるため好ましい。
研磨用組成物における砥粒の含有量(質量%)に対する前記ヒドロキシエチルセルロースの含有量(質量%)の比が前記範囲であることにより、特定のサイズの表面欠陥の除去性をより高めることができる。同時に、研磨対象物の研磨後の表面の濡れ性を向上させることができる。
砥粒の含有量が前記範囲である場合には、適度な研磨速度に調整できるため好ましい。
すなわち、研磨用組成物においてヒドロキシエチルセルロースの一部はコロイダルシリカ等の砥粒表面に吸着される。従って、研磨用組成物中には、砥粒に吸着された状態のヒドロキシエチルセルロースと、砥粒に吸着されずに研磨用組成物中に混合されているヒドロキシエチルセルロースとが存在している。砥粒にヒドロキシエチルセルロースが吸着されると、ヒドロキシエチルセルロースの作用によって砥粒がクラスターを形成すると考えられる。ヒドロキシエチルセルロースの分子量が大きいほど、あるいはヒドロキシエチルセルロースの研磨用組成物中の含有量が多いほど、クラスターは大きくなりやすい。
かかるクラスターの大きさ及び量によって、研磨対象物の表面に存在する特定のサイズの表面欠陥の低減性能が変化すると考えられる。
よって、砥粒に吸着されるヒドロキシエチルセルロースと、吸着されないヒドロキシエチルセルロースとのバランスをとることで、本実施形態の研磨用組成物は、研磨対象物の表面に存在する特定のサイズの表面欠陥を低減することができると考えられる。
研磨用組成物1.5mgを14000rpm 10minで遠心分離した上澄みと、研磨用組成物のTOC(全有機炭素;Total Organic Carbon)量を測定し、以下の式1によって砥粒に吸着されているヒドロキシエチルセルロースの割合(吸着ヒドロキシエチルセルロースの割合(%))は算出される。
吸着ヒドロキシエチルセルロースの割合(%)=(研磨組成物のTOC-上澄みのTOC)/研磨用組成物のTOC・・・(式1)
アンモニアを含むことで、研磨対象物の表面に存在する特定のサイズの表面欠陥をより十分に低減することができるため好ましい。
アンモニアの含有量は特に限定されるものではないが、例えば、0.1質量%以上1.0質量%以下、好ましくは0.25質量%以上0.75質量%以下であることが挙げられる。
アンモニアの含有量が前記範囲である場合には、研磨対象物の表面に存在する特定のサイズの表面欠陥をより十分に低減することができるため好ましい。
またアンモニアの含有量が前記範囲である場合には、研磨用組成物のpHを適切な範囲に調整することもできるため好ましい。
かかる高濃度液として調整した場合には、研磨用組成物の貯蔵、輸送に便利である。
尚、高濃度液として調整する場合には、例えば、使用時に5倍~100倍、好ましくは20倍~60倍、より好ましくは21倍~41倍に希釈できる程度の濃度に調整することが挙げられる。
本実施形態の研磨方法は、前記中間研磨工程の後に前記半導体基板を仕上げ研磨する最終研磨工程を備える。
最終研磨工程では、前記中間研磨工程を実施した後に半導体基板表面に残存する、高さが3nm未満の比較的小さい微小な欠陥を除去しつつ、ヘイズ等のない、高い平坦性を有する基板に研磨する。
本発明では、前記中間研磨工程において、ヒドロキシエチルセルロースと水と砥粒とを含む研磨用組成物であって、前記ヒドロキシエチルセルロースは分子量が50万以上150万以下であって、砥粒に吸着されているヒドロキシエチルセルロースの割合が45%以上90%以下である研磨用組成物を用いて研磨してもよい。
上述のような研磨用組成物を中間研磨工程で用いて研磨することで、最終研磨工程後の半導体基板表面の表面欠陥をより十分に低減することができる。
本実施例では、中間研磨工程において使用する研磨用組成物を用いて研磨試験を行った。
下記表1に示す異なる分子量(50万、100万)のヒドロキシエチルセルロースを準備した。
尚、ヒドロキシエチルセルロースの分子量は以下の方法で測定した分子量である。
分子量は、以下のように測定して得られた重量平均分子量の値である。
測定装置として、GFC装置(日本分光社製:PU-2085plus型システム)を用い、カラムはShodex社製 AsahipakGF-710HQとGF-310HQを2本直列に連結し用い、溶離液に0.7%塩化ナトリウム水溶液を用いて測定した。
各研磨用組成物を水で41倍に希釈して、被研磨物としてのシリコン製ウェーハ(12インチ)を下記研磨条件で研磨を行い、研磨後の表面欠陥を以下の方法で測定した結果を表1に示した。
研磨装置:SPP800S(岡本工作機械社製)
研磨パッド:POLYPAS 24T(フジボウ愛媛株式会社製)
定盤速度:40rpm
研磨荷重:120gf/cm2
流量:0.6L/min
被研磨物:12inch Silicon wafer
研磨時間:300sec
表面欠陥(Defect)は、前記研磨条件で研磨した後のウェーハをアンモニア/過酸化水素混合液で洗浄した後に、測定装置(MAGICS M5640(レーザーテック社製)を用いて測定(エッジエクスクルージョン EE:5mm,Slice level:D37mV)を行った。
MAGICSで測定された欠陥の座標を元に測定装置AFM SAP465 (セイコーインスツル株式会社製)を用いて欠陥の測定を行った。
前記2種類の測定結果から、表面欠陥を以下方法でA~Fタイプに分類し、図1に示すグラフに各表面欠陥の割合を示した。表1には各タイプの割合を%で示した。
MAGICSレビュー画像の分類方法は、レビュー画像の欠陥部分が、画像の左から右に向かって変化する白黒の色の部分の順序によって以下のようなA~Fタイプに分類した。尚、MAGICSのレビュー画像の分析にはバンドパスフィルタを使用した。
MAGICSレビュー画像上では、バンドパスフィルタの影響で、欠陥が非常に小さい(低い)場合には、白→黒→白あるいは黒→白→黒というように、3回色が変化する。白→黒→白、黒→白→黒のいずれか高さが低い欠陥かはAFMで分析する。
Aタイプ:白黒白 且つスクラッチ状の像
Bタイプ:白黒白
Cタイプ:黒白黒
Dタイプ:白黒
Eタイプ:黒白
Fタイプ:黒
各タイプの欠陥をAFMで測定すると欠陥の寸法は以下のような範囲になった。
すなわち、欠陥を以下のようなA~Fに分類した。
Aタイプ:高さ3nm未満、幅50-200nm、長さ200μm以上
Bタイプ:高さ3nm未満、幅150-350nm
Cタイプ:高さ3nm以上10nm未満、幅50-70nm
Dタイプ:高さ10nm以上30nm以下、幅70-250nm
Eタイプ:高さ10nm以上50nm以下、幅100-300nm
Fタイプ:高さ50nm超、幅150nm超
尚、Aタイプはキズ状の長さ成分を持つ欠陥であり、B~Fは点または不定形の欠陥である。
各研磨組用成物及びこれらの41倍希釈液の液温度25℃の時のpHを、pHメーター(堀場製作所社製)を用いて測定した。
各研磨用組成物を41倍に水で希釈し、1.5mgサンプルとして採取し、遠心分離機 MCD-2000(アズワン社製)で14000rpm 10min遠心分離した。その後沈殿物と上澄みに分離し、該上澄み液を取り出し、該上澄み液及び各研磨用組成物のTOC(全有機炭素;Total Organic Carbon)量を、測定装置 Siervers900(GE社製)で測定した。測定結果から、下記式1により、各研磨用組成物の吸着ヒドロキシエチルセルロースの割合を算出した結果を表1に示す。
吸着ヒドロキシエチルセルロースの割合(%)=(研磨用組成物のTOC-上澄みのTOC)/研磨用組成物のTOC×100・・・(式1)
各研磨用組成物の41倍希釈液中の砥粒(クラスター)の粒子径を測定した。
測定装置は、ゼータ電位・粒径測定システム ELSZ-2(大塚電子社製)を用いて粒子径を測定した。結果を表1に示す。
Claims (5)
- 半導体基板の表面において高さ3nm未満の表面欠陥数が全表面欠陥数の45%以上になるように研磨する中間研磨工程と、
前記中間研磨工程の後に前記半導体基板を仕上げ研磨する最終研磨工程とを備える半導体基板の研磨方法。 - 前記中間研磨工程において、
ヒドロキシエチルセルロースと水と砥粒とを含む研磨用組成物であって、
前記ヒドロキシエチルセルロースは分子量が50万以上150万以下であって、
前記砥粒に対する前記ヒドロキシエチルセルロースの質量比が0.0075以上0.025以下である研磨用組成物を用いて研磨する請求項1に記載の半導体基板の研磨方法。 - 前記中間研磨工程において、
ヒドロキシエチルセルロースと水と砥粒とを含む研磨用組成物であって、
前記ヒドロキシエチルセルロースは分子量が50万以上150万以下であって、
砥粒に吸着されているヒドロキシエチルセルロースの割合が45%以上90%以下である研磨用組成物を用いて研磨する請求項1に記載の半導体基板の研磨方法。 - 前記中間研磨工程の前に、半導体基板の両面を研磨する両面研磨工程を備える請求項1乃至3のいずれか一項に記載の半導体基板の研磨方法。
- 前記最終研磨工程において、
ヒドロキシエチルセルロースと水と砥粒とを含み、
前記ヒドロキシエチルセルロースは分子量が30万以上120万以下である研磨用組成物を用いて研磨する請求項1乃至4のいずれか一項に記載の半導体基板の研磨方法。
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| KR1020167028681A KR102380782B1 (ko) | 2014-03-31 | 2015-03-30 | 반도체 기판의 연마 방법 |
| DE112015001589.2T DE112015001589B4 (de) | 2014-03-31 | 2015-03-30 | Verfahren zum Polieren eines Halbleiter-Substrats |
| MYPI2016703572A MY188234A (en) | 2014-03-31 | 2015-03-30 | Method for polishing semiconductor substrate |
| CN201580018016.8A CN106165063A (zh) | 2014-03-31 | 2015-03-30 | 半导体衬底的研磨方法 |
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| DE112015001589T5 (de) | 2017-02-23 |
| SG11201608127SA (en) | 2016-11-29 |
| CN106165063A (zh) | 2016-11-23 |
| JP6314019B2 (ja) | 2018-04-18 |
| DE112015001589B4 (de) | 2026-01-29 |
| KR20160138128A (ko) | 2016-12-02 |
| KR102380782B1 (ko) | 2022-03-29 |
| US20170178888A1 (en) | 2017-06-22 |
| JP2015198112A (ja) | 2015-11-09 |
| US10249486B2 (en) | 2019-04-02 |
| TW201600230A (zh) | 2016-01-01 |
| MY188234A (en) | 2021-11-24 |
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