JP7197366B2 - 研磨用組成物及び研磨方法 - Google Patents
研磨用組成物及び研磨方法 Download PDFInfo
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- JP7197366B2 JP7197366B2 JP2018559406A JP2018559406A JP7197366B2 JP 7197366 B2 JP7197366 B2 JP 7197366B2 JP 2018559406 A JP2018559406 A JP 2018559406A JP 2018559406 A JP2018559406 A JP 2018559406A JP 7197366 B2 JP7197366 B2 JP 7197366B2
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- polishing
- acid
- polishing composition
- abrasive grains
- layered
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- 235000010493 xanthan gum Nutrition 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
- 229910000166 zirconium phosphate Inorganic materials 0.000 description 1
- LEHFSLREWWMLPU-UHFFFAOYSA-B zirconium(4+);tetraphosphate Chemical class [Zr+4].[Zr+4].[Zr+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LEHFSLREWWMLPU-UHFFFAOYSA-B 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
- B24B37/044—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor characterised by the composition of the lapping agent
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
-
- 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
-
- 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
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Description
本発明に係る研磨対象物は、半導体基板である。半導体基板の例としては、たとえば単結晶シリコン基板(シリコンウェハ)、単結晶ゲルマニウム基板、単結晶シリコンゲルマニウム基板などの第14族元素からなる単結晶半導体基板;SiC基板、SiGe基板、ZnS基板、ZnSe基板、InP基板、AlN基板、GaAs基板、GaN基板、AlGaAs基板、InGaAs基板、GaP基板、ZnTe基板、CdTd基板等の化合物半導体基板;等が挙げられる。これらの中でも、化合物半導体基板が好ましく、SiC基板がより好ましい。
本発明の研磨用組成物は、砥粒を含む。砥粒は、研磨対象物を機械的に研磨する作用を有する。
本発明の研磨用組成物において、層状化合物は、砥粒との分子間力や静電的な作用等により、砥粒粒子と引き合いながら弱い結合を形成し、砥粒粒子間に立体障害となるような状態で存在しうる。これにより、砥粒の凝集が抑えられるため、研磨性能を維持しつつ沈降を防止させたりや再分散性を向上させたりする本発明の効果が得られると考えられる。
層状ケイ酸塩化合物は、ケイ酸四面体が平面的につながっている構造が基本となり、単位構造の中にケイ酸四面体シート1枚または2枚と、アルミナまたはマグネシア八面体シート1枚とを含むことを特徴とする構造体である。その層間(単位構造間)においては、ナトリウム、カリウム、カルシウム等の陽イオンが存在する。また、該層状ケイ酸塩化合物は、結晶が薄く剥がれる性質を有する物質である。
本発明に係る研磨用組成物は、各成分を分散するための分散媒を含む。分散媒としては水が好ましい。他の成分の作用を阻害することを抑制するという観点から、不純物をできる限り含有しない水が好ましく、具体的には、イオン交換樹脂にて不純物イオンを除去した後、フィルタを通して異物を除去した純水や超純水、または蒸留水が好ましい。
本発明の研磨用組成物のpHの下限は、特に制限されないが、1.0以上であることが好ましく、3.0以上であることがより好ましく、5.0以上であることがさらに好ましく、7.0以上が最も好ましい。また、pHの上限は、特に制限されないが、13.0以下であることが好ましく、12.0以下であることがより好ましく、11.0以下であることがさらに好ましく、10.0以下であることが特に好ましい。
本発明の研磨用組成物は、酸またはその塩を含むことが好ましい。酸またはその塩は、研磨用組成物のpHを調整する役割を果たす。
上記pHの範囲に調整するために、塩基またはその塩を用いてもよい。塩基またはその塩の例としては、脂肪族アミン、芳香族アミン等のアミン、水酸化第四アンモニウムなどの有機塩基、水酸化ナトリウム、水酸化カリウム等のアルカリ金属の水酸化物、水酸化マグネシウム、水酸化カルシウム等の第2族元素の水酸化物、およびアンモニア等が挙げられる。
本発明の研磨用組成物は、必要に応じて、研磨対象物の表面を酸化させる酸化剤、研磨対象物の表面や砥粒表面に作用する水溶性高分子、研磨対象物の腐食を抑制する防食剤やキレート剤、その他の機能を有する防腐剤、防黴剤等の他の成分をさらに含んでもよい。
本発明の研磨用組成物の製造方法は、特に制限されず、たとえば、砥粒、層状化合物、および必要に応じて他の成分を、分散媒中で攪拌混合することにより得ることができる。
上述のように、本発明の研磨用組成物は、半導体基板の研磨に好適に用いられる。
(研磨用組成物の調製)
砥粒(平均二次粒子径0.4μm)が6質量%の含有量となるように水で希釈し、層状ケイ酸塩化合物またはそれに代わる他の化合物を下記表1に示す含有量となるように加え、さらに過マンガン酸カリウムを1質量%の含有量となるように加えて室温(25℃)で攪拌し、分散液を調製した。次いで、前記の分散液に塩基として水酸化カリウム水溶液を加え、pHメーターにより確認しながら、pH9.0に調整し、実施例1~6および比較例1~3の研磨用組成物を得た。
酸化アルミニウム(アルミナ):平均二次粒子径は、株式会社堀場製作所製のレーザー回折/散乱式粒度分布測定装置LA-950を用いて測定した。
ベントナイト:粒子径1.3μm
ヘクトライト:粒子径4.0μm、または0.15μm
なお層状ケイ酸塩化合物の粒子径は、以下の測定により求めたものである。すなわち、株式会社日立ハイテクノロジーズ製の走査型電子顕微鏡“SU8000”を用いて100個の層状ケイ酸塩化合物粒子を観察し、それぞれの粒子画像に外接する最小の長方形を描く。そして、粒子画像に対して描かれたそれぞれの長方形について、その長辺の長さを測定し、それを平均した値を層状ケイ酸塩化合物の粒子径とした。
調製した後に、25℃で1~2日保管した後の研磨用組成物を用いて、容量100mlの比色管(アズワン株式会社製)に研磨用組成物を100mlの目盛りまで入れてから2時間静置した。静置後に、砥粒層と上澄み液との界面の嵩の目盛りを読み取り、下記基準により判定した。評価C以上が合格である:
AAA:80mlより多い
AA:60mlより多く80ml以下
A:40mlより多く60ml以下
B:30mlより多く40ml以下
C:20mlより多く30ml以下
D:20ml以下。
調製した後に、25℃で1~2日保管した後の研磨用組成物を用いて、容量1000mlのPP容器(アズワン株式会社製)に、研磨用組成物を800mlの目盛りまで入れ、72時間静置した。静置後、PP容器を上下に振り混ぜ、砥粒の沈殿が再分散してなくなるまでの回数を測定し、下記基準により判定した。評価A~Cが合格である:
A:1~3回
B:4~6回
C:7~9回
D:10回以上。
調製した後に、25℃で1~2日保管した後の研磨用組成物を用いて、下記の研磨条件で研磨を行い、研磨速度を求めた。また、研磨後の各研磨対象物の表面粗さを下記方法により測定した:
<研磨条件>
研磨装置:EJ-380IN(日本エンギス株式会社製)
研磨パッド:SUBA800(ニッタハース株式会社製)
研磨荷重:300g/cm2
定盤回転数:80rpm
研磨時間:30min
<研磨対象物>
SiC基板:2インチN型 4H-SiC 4°off。
研磨前後の研磨対象物の質量の差から研磨速度を算出した。
研磨後の研磨対象物の表面粗さRaを、原子間力顕微鏡(パークシステムズ社製、NX-HDM)を用いて測定した。なお、表面粗さRaは、粗さ曲線の高さ方向の振幅の平均を示すパラメーターであって、一定視野内での研磨対象物表面の高さの算術平均を示す。
上記の実施例2で調製した研磨用組成物について、下記表2に示すような保管温度および保管日数で保管した後の研磨用組成物を用いて、上記の(砥粒の沈降防止性の評価)、(砥粒の再分散性の評価)、および(研磨の評価)を行った。
各実施例で調製した研磨用組成物を東機産業株式会社製のB型粘度計TVB-10に装填し、測定温度25℃、回転数100rpmの条件で粘度を測定した。測定において使用したローターの種類はH3である。
各実施例で調製した研磨用組成物を用いて、容量1000mlのポリプロピレン容器(アズワン株式会社製)に研磨用組成物を800mlの目盛りまで入れてから72時間静置した。静置後に、ポリプロピレン容器を静かに横に倒し、容器下部の状態を目視し、下記基準により判定した。評価AおよびBが合格である:
A:容器底部及び壁部に沈殿が全く残っていない
B:容器底部に沈殿は残らないが、容器壁部に残留物が見られる
C:容器底部に沈殿が残っている。
Claims (4)
- 化合物半導体基板の研磨に用いられる研磨用組成物であって、砥粒と、層状化合物(ただし、雲母およびタルクを除く)と、分散媒と、を含み、
前記層状化合物は層状ケイ酸塩化合物であり、
前記層状ケイ酸塩化合物の粒子径は、0.01μm以上5μm以下であり、
前記砥粒は、酸化アルミニウム、酸化ジルコニウム、酸化チタン、酸化マンガン、金属炭化物、金属窒化物、および金属ホウ化物からなる群より選択される少なくとも1種である、研磨用組成物。 - 前記層状ケイ酸塩化合物は、ヘクトライトまたはベントナイトである、請求項1に記載の研磨用組成物。
- 前記砥粒の平均二次粒子径が1.8μm以下である、請求項1または2に記載の研磨用組成物。
- 請求項1~3のいずれか1項に記載の研磨用組成物を、製造後10℃以上の温度で20日以上保管する工程と、
保管後の前記研磨用組成物を用いて半導体基板を研磨する工程と、
を含む、研磨方法。
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- 2017-12-22 EP EP17889510.8A patent/EP3561858B1/en active Active
- 2017-12-22 JP JP2018559406A patent/JP7197366B2/ja active Active
- 2017-12-22 CN CN201780080611.3A patent/CN110168702B/zh active Active
- 2017-12-22 US US16/473,346 patent/US11781039B2/en active Active
- 2017-12-26 TW TW106145708A patent/TWI828615B/zh active
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TWI828615B (zh) | 2024-01-11 |
JPWO2018123875A1 (ja) | 2019-11-14 |
EP3561858B1 (en) | 2022-10-19 |
EP3561858A4 (en) | 2020-01-01 |
TW201831643A (zh) | 2018-09-01 |
US20200123413A1 (en) | 2020-04-23 |
WO2018123875A1 (ja) | 2018-07-05 |
US20200392376A1 (en) | 2020-12-17 |
CN110168702B (zh) | 2023-12-29 |
EP3561858A1 (en) | 2019-10-30 |
CN110168702A (zh) | 2019-08-23 |
US11781039B2 (en) | 2023-10-10 |
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