JP2015086355A - 研磨用組成物、研磨方法、及び基板の製造方法 - Google Patents
研磨用組成物、研磨方法、及び基板の製造方法 Download PDFInfo
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- JP2015086355A JP2015086355A JP2014052608A JP2014052608A JP2015086355A JP 2015086355 A JP2015086355 A JP 2015086355A JP 2014052608 A JP2014052608 A JP 2014052608A JP 2014052608 A JP2014052608 A JP 2014052608A JP 2015086355 A JP2015086355 A JP 2015086355A
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- polishing
- acid
- polishing composition
- polysilicon
- abrasive grains
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- 229920002717 polyvinylpyridine Polymers 0.000 description 1
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- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 229940086066 potassium hydrogencarbonate Drugs 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 102000004196 processed proteins & peptides Human genes 0.000 description 1
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- 235000019423 pullulan Nutrition 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- MUPFEKGTMRGPLJ-ZQSKZDJDSA-N raffinose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO[C@@H]2[C@@H]([C@@H](O)[C@@H](O)[C@@H](CO)O2)O)O1 MUPFEKGTMRGPLJ-ZQSKZDJDSA-N 0.000 description 1
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- 229940071089 sarcosinate Drugs 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
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- 229940096501 sodium cocoamphoacetate Drugs 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- GOJYXPWOUJYXJC-UHFFFAOYSA-M sodium;2-[1-(2-hydroxyethyl)-2-undecyl-4,5-dihydroimidazol-1-ium-1-yl]acetate;hydroxide Chemical compound [OH-].[Na+].CCCCCCCCCCCC1=NCC[N+]1(CCO)CC([O-])=O GOJYXPWOUJYXJC-UHFFFAOYSA-M 0.000 description 1
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- 238000001179 sorption measurement Methods 0.000 description 1
- UQZIYBXSHAGNOE-XNSRJBNMSA-N stachyose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO[C@@H]2[C@@H]([C@@H](O)[C@@H](O)[C@@H](CO[C@@H]3[C@@H]([C@@H](O)[C@@H](O)[C@@H](CO)O3)O)O2)O)O1 UQZIYBXSHAGNOE-XNSRJBNMSA-N 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
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- 229960003080 taurine Drugs 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- DZLFLBLQUQXARW-UHFFFAOYSA-N tetrabutylammonium Chemical compound CCCC[N+](CCCC)(CCCC)CCCC DZLFLBLQUQXARW-UHFFFAOYSA-N 0.000 description 1
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 1
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 description 1
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 description 1
- UJJLJRQIPMGXEZ-UHFFFAOYSA-N tetrahydro-2-furoic acid Chemical compound OC(=O)C1CCCO1 UJJLJRQIPMGXEZ-UHFFFAOYSA-N 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
- 150000003538 tetroses Chemical class 0.000 description 1
- UAXOELSVPTZZQG-UHFFFAOYSA-N tiglic acid Natural products CC(C)=C(C)C(O)=O UAXOELSVPTZZQG-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 150000004043 trisaccharides Chemical class 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- AQLJVWUFPCUVLO-UHFFFAOYSA-N urea hydrogen peroxide Chemical compound OO.NC(N)=O AQLJVWUFPCUVLO-UHFFFAOYSA-N 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
- FYGDTMLNYKFZSV-BYLHFPJWSA-N β-1,4-galactotrioside Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@H](CO)O[C@@H](O[C@@H]2[C@@H](O[C@@H](O)[C@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O FYGDTMLNYKFZSV-BYLHFPJWSA-N 0.000 description 1
Classifications
-
- 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
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
-
- 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
- H01L21/04—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
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/32115—Planarisation
- H01L21/3212—Planarisation by chemical mechanical polishing [CMP]
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
本発明の目的は、ポリシリコンを含む層を有する研磨対象物を研磨する用途での使用に、より適した研磨用組成物、研磨方法、及び基板の製造方法を提供することにある。
本実施形態の研磨用組成物は、砥粒、酸化剤、及び水を混合し、pHを6以上に調整することにより製造される。本実施形態の研磨用組成物は、分子量が100以上である、糖類、水溶性高分子、及び界面活性剤から選ばれる少なくとも1種を含有することが好ましい。この研磨用組成物は、ポリシリコンを含む層を有する研磨対象物を研磨する用途で用いられる。
砥粒の平均二次粒子径の下限は、10nm以上であることが好ましく、15nm以上であることがより好ましく、20nm以上であることがさらに好ましい。また、砥粒の平均二次粒子径の上限は、450nm以下であることが好ましく、350nm以下であることがより好ましく、220nm以下であることがさらに好ましい。このような範囲であれば、研磨用組成物による研磨対象物の研磨速度はより向上し、研磨用組成物を用いて研磨した際の研磨対象物の表面における表面欠陥の発生をより抑制することができる。尚、本実施形態における二次粒子とは、砥粒が研磨用組成物中で会合して形成する粒子をいい、この二次粒子の平均二次粒子径は、例えば動的光散乱法により測定することができる。
pH調整剤として使用できる酸の具体例としては、塩酸、硫酸、硝酸、フッ酸、ホウ酸、炭酸、次亜リン酸、亜リン酸及びリン酸等の無機酸や、ギ酸、酢酸、プロピオン酸、酪酸、吉草酸、2−メチル酪酸、n−ヘキサン酸、3,3−ジメチル酪酸、2−エチル酪酸、4−メチルペンタン酸、n−ヘプタン酸、2−メチルヘキサン酸、n−オクタン酸、2−エチルヘキサン酸、安息香酸、グリコール酸、サリチル酸、グリセリン酸、シュウ酸、マロン酸、コハク酸、グルタル酸、アジピン酸、ピメリン酸、マレイン酸、フタル酸、リンゴ酸、酒石酸、クエン酸、乳酸、ジグリコール酸、2−フランカルボン酸、2,5−フランジカルボン酸、3−フランカルボン酸、2−テトラヒドロフランカルボン酸、メトキシ酢酸、メトキシフェニル酢酸、フェノキシ酢酸等の有機酸が挙げられる。これらの酸は、一種を単独で用いてもよいし、二種以上を組み合わせて用いてもよい。
研磨用組成物中には、分子量が100以上である、糖類、水溶性高分子、及び界面活性剤から選ばれる少なくとも1種を配合してもよい。かかる成分を配合することにより、段差解消効率をより向上させることができる。また、研磨後のポリシリコン表面に親水性を付与することにより研磨後の洗浄性を良くし、汚れの付着等を防ぐことができる。
アニオン性界面活性剤は、例えば、硫酸系、スルホン酸系、リン酸系、ホスホン酸系、及びカルボン酸系に分類される。アニオン界面活性剤の具体例としては、アルキル硫酸エステル、ポリオキシエチレンアルキル硫酸エステル、ポリオキシエチレンアルキル硫酸、アルキル硫酸、アルキルエーテル硫酸エステル、高級アルコール硫酸エステル、アルキルリン酸エステル、アルキルベンゼンスルホン酸、α−オレフィンスルホン酸、アルキルスルホン酸、スチレンスルホン酸、アルキルナフタレンスルホン酸、アルキルジフェニルエーテルジスルホン酸、ポリオキシエチレンアルキルエーテル酢酸、ポリオキシエチレンアルキルエーテルリン酸、ポリオキシエチレンアルキルリン酸エステル、ポリオキシエチレンスルホコハク酸、アルキルスルホコハク酸、又はそれらの塩、タウリン系界面活性剤、ザルコシネート系界面活性剤、イセチオネート系界面活性剤、N−アシル酸性アミノ酸系界面活性剤、高級脂肪酸塩、アシル化ポリペプチド等が挙げられる。アルキルスルホン酸又はその塩の具体例としては、ドデシルスルホン酸及びドデシルスルホン酸塩等が挙げられる。
分散媒又は溶媒としては、各成分を分散又は溶解するために配合される。分散媒又は溶媒の具体例としては、水が好ましく、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より好ましい。不純物をできる限り含有しない水の具体的としては、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、又は蒸留水が挙げられる。
本実施形態の研磨用組成物を用いた研磨方法は、上述した研磨用組成物を使用して、研磨対象物であるポリシリコンを含む層を有する基板表面を研磨する方法を含む。それにより、研磨対象物であるポリシリコンに対する研磨特性をより向上させることができる。特に基板の表面に配線の多層化等に起因する段差、例えば初期段差が生じているときに、段差解消特性を向上させることができる。段差解消特性は、ある研磨過程において、段差の高さ(一つの凹部において、凹部の最低部からその凹部を構成する凸部の最上部までの高さ(Å))が研磨により解消された量(Å)/前記研磨過程での総研磨量(研磨前の前記凸部の最上部高さから研磨後の凸部の最上部高さまでの距離(Å))によって求められる段差解消効率によって評価することができる。かかる値が1に近いほど凸部の上面のみが選択的に研磨され、研磨効率をより優れたものとすることができる。段差解消効率は、研磨圧力15.2kPa、定盤回転数93rpmの研磨条件で研磨した場合、0.4以上が好ましく、0.5以上がより好ましい。
上記実施形態の研磨用組成物によれば、以下のような効果を得ることができる。
・上記実施形態の研磨用組成物は、研磨用組成物の原液を水で希釈することによって調製されてもよい。
・上記実施形態の研磨用組成物において、成分の一つである酸化剤は、研磨用組成物の製造過程で添加する必要はなく、研磨装置につなぎこむ際に混合してもよく、研磨装置付属の研磨用組成物を供給するタンク内において混合してもよい。
各実施例では、砥粒にpH調整剤及び水を添加し、さらに酸化剤を添加して研磨用組成物を調製した。また、実施例10〜20においては、特定の糖類等の添加剤をさらに添加して研磨用組成物を調製した。各比較例では、砥粒にpH調整剤及び水を添加して調製した。各例の研磨用組成物中の成分の詳細、及び各例の研磨用組成物のpHを測定した結果を表1に示す。
Aは、平均一次粒子径が30nm、平均二次粒子径が62nmであるコロイダルシリカ、
Bは、平均一次粒子径が10nm、平均二次粒子径が25nmであるコロイダルシリカ、
Cは、平均一次粒子径が90nm、平均二次粒子径が180nmであるコロイダルシリカを示す。
表1の“ポリシリコン膜の研磨レート”欄は、各例の研磨用組成物を用いて直径200mmのポリシリコン膜ブランケットウエハの表面を表2に示す条件で研磨したときのポリシリコン除去速度を示す。ポリシリコン除去速度の値は、大日本スクリーン製造株式会社の光干渉式膜厚測定装置“ラムダエースVM−2030”を使用して測定される研磨前後の各基板の厚さの差を研磨時間(60秒)で除することにより求めた。
(a)さらにpH調整剤としてアルカリ金属の水酸化物を含有することを特徴とする前記研磨用組成物。
Claims (9)
- ポリシリコンを含む層を有する研磨対象物を研磨する用途で用いられ、砥粒及び酸化剤を含み、pHが6以上であることを特徴とする研磨用組成物。
- 前記砥粒がコロイダルシリカであることを特徴とする請求項1に記載の研磨用組成物。
- 前記砥粒の平均一次粒子径が5nm〜400nmであることを特徴とする請求項1又は請求項2に記載の研磨用組成物。
- 前記酸化剤が過酸化物であることを特徴とする請求項1〜3のいずれか1項に記載の研磨用組成物。
- さらに、分子量が100以上である、糖類、水溶性高分子、及び界面活性剤から選ばれる少なくとも1種を含有することを特徴とする請求項1〜4のいずれか1項に記載の研磨用組成物。
- 前記研磨対象物は、表面に段差を有することを特徴とする請求項1〜5のいずれか一項に記載の研磨用組成物。
- 研磨圧力15.2kPa、定盤回転数93rpmの研磨条件で、前記段差を有する研磨対象物の表面を研磨した際の段差解消効率が0.4以上であることを特徴とする請求項6に記載の研磨用組成物。
- 請求項1〜7のいずれか1項に記載の研磨用組成物を用いて、ポリシリコンを含む層を有する研磨対象物を研磨することを特徴とする研磨方法。
- 請求項8に記載の研磨方法によってポリシリコンを含む層を有する基板を研磨する研磨工程を含むことを特徴とする基板の製造方法。
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| KR20210036804A (ko) | 2019-09-26 | 2021-04-05 | 가부시키가이샤 후지미인코퍼레이티드 | 연마용 조성물 및 연마 방법 |
| US11492512B2 (en) | 2019-09-26 | 2022-11-08 | Fujimi Incorporated | Polishing composition and polishing method |
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| KR102394104B1 (ko) * | 2016-09-28 | 2022-05-04 | 가부시키가이샤 후지미인코퍼레이티드 | 표면 처리 조성물 |
| JP6957265B2 (ja) * | 2016-09-29 | 2021-11-02 | 花王株式会社 | 研磨液組成物 |
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