JP2011071299A - パターン形成方法及び半導体素子 - Google Patents
パターン形成方法及び半導体素子 Download PDFInfo
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- JP2011071299A JP2011071299A JP2009220832A JP2009220832A JP2011071299A JP 2011071299 A JP2011071299 A JP 2011071299A JP 2009220832 A JP2009220832 A JP 2009220832A JP 2009220832 A JP2009220832 A JP 2009220832A JP 2011071299 A JP2011071299 A JP 2011071299A
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- 238000000034 method Methods 0.000 title claims abstract description 63
- 239000004065 semiconductor Substances 0.000 title claims description 14
- 239000000758 substrate Substances 0.000 claims abstract description 55
- 239000000203 mixture Substances 0.000 claims abstract description 36
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- 238000012546 transfer Methods 0.000 claims description 41
- 238000003851 corona treatment Methods 0.000 claims description 16
- 229920001296 polysiloxane Polymers 0.000 claims description 11
- 230000005865 ionizing radiation Effects 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 6
- 230000007261 regionalization Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 abstract description 3
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- 239000003795 chemical substances by application Substances 0.000 description 17
- 238000012545 processing Methods 0.000 description 16
- 229910052731 fluorine Inorganic materials 0.000 description 10
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- 238000010586 diagram Methods 0.000 description 9
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- 239000007789 gas Substances 0.000 description 9
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- PUBNJSZGANKUGX-UHFFFAOYSA-N 2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-(4-morpholin-4-ylphenyl)butan-1-one Chemical compound C=1C=C(N2CCOCC2)C=CC=1C(=O)C(CC)(N(C)C)CC1=CC=C(C)C=C1 PUBNJSZGANKUGX-UHFFFAOYSA-N 0.000 description 2
- 125000004200 2-methoxyethyl group Chemical group [H]C([H])([H])OC([H])([H])C([H])([H])* 0.000 description 2
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
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- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 2
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- 238000002360 preparation method Methods 0.000 description 2
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- PTDFYTRMUCOFBP-UHFFFAOYSA-M propyl [4-(thiolan-1-ium-1-yl)naphthalen-1-yl] carbonate;trifluoromethanesulfonate Chemical compound [O-]S(=O)(=O)C(F)(F)F.C12=CC=CC=C2C(OC(=O)OCCC)=CC=C1[S+]1CCCC1 PTDFYTRMUCOFBP-UHFFFAOYSA-M 0.000 description 2
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- MMZCYVBYIOUFEO-UHFFFAOYSA-N (1,3-dioxoisoindol-2-yl) 4-methylbenzenesulfonate Chemical compound C1=CC(C)=CC=C1S(=O)(=O)ON1C(=O)C2=CC=CC=C2C1=O MMZCYVBYIOUFEO-UHFFFAOYSA-N 0.000 description 1
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
Abstract
【解決手段】(1)被加工基板の表面を電離線照射処理し、電離線照射処理面を有する電離線照射処理基板を形成する工程と、(2)電離線照射処理面上に、光又は熱の作用により硬化する硬化性組成物からなる被形状転写層を形成する工程と、(3)被形状転写層にスタンパを圧接する工程と、(4)スタンパを圧接したまま被形状転写層を露光する工程と、(5)スタンパを被形状転写層から剥離して、レジストパターンが形成された基板を得る工程と、を含むパターン形成方法である。
【選択図】なし
Description
本発明のパターン形成方法は、(1)被加工基板の表面を電離線照射処理し、電離線照射処理面を有する電離線照射処理基板を形成する工程(以下、「電離線照射処理工程」という)と、(2)電離線照射処理面上に、光又は熱の作用により硬化する硬化性組成物からなる被形状転写層を形成する工程(以下、「被形状転写層形成工程」という)と、(3)被形状転写層にスタンパを圧接する工程(以下、「圧接工程」という)と、(4)スタンパを圧接したまま被形状転写層を露光する工程(以下、「露光工程」という)と、(5)スタンパを被形状転写層から剥離して、レジストパターンが形成された基板を得る工程(以下、「剥離工程」という)と、を含む方法であり、剥離工程の後に、エッチングを行う工程(6)(以下、「エッチング工程」ともいう)を更に含む方法であることが好ましい。本発明のパターン形成方法により基板上にレジストパターンを形成することで、パターンの高さのバラツキを抑制することができる。
電離線照射処理工程は、被加工基板の表面を電離線照射処理し、電離線照射処理面を有する電離線照射処理基板を形成する工程である。被加工基板の表面を電離線照射処理することにより、基板面内で均一な表面状態を有する基板が形成できるため、基板に形成されるパターンの高さのバラツキを抑制することができる。
被加工基板としては、通常、シリコンウェハが用いられるが、その他、アルミニウム、チタン−タングステン合金、アルミニウム−ケイ素合金、アルミニウム−銅−ケイ素合金、酸化ケイ素、窒化ケイ素等の半導体デバイス用基板として知られているものの中から任意に選んで用いることができる。なお、被加工基板の電離線照射処理を行う表面には、ポリシロキサンからなる下層膜が形成されていることが好ましい。このような下層膜を形成することにより、電離線照射処理による効果を向上することができる。
本発明における電離線としては、被加工基板を均一な表面状態にするものであれば特に限定されないが、例えば、レーザービーム、イオンビーム、電子線ビーム、紫外線照射、プラズマ放電、コロナ放電等がある。中でもコロナ放電が好ましく使用される。コロナ放電処理は、特に限定されなく、スパークギャップ方式、真空管方式、ソリッドステート方式等を利用する、従来公知の装置を用いて行うことができる。このような装置としては、例えば、高周波電源AGF−012(春日電機社製)がある。コロナ放電処理量は、100W・min/m2以上であることが好ましく、125W・min/m2以上であることが更に好ましい。コロナ放電処理量が100W・min/m2未満であると、基板に形成されるレジストパターンの高さのバラツキの抑制が不十分な場合がある。なお、コロナ放電処理量は下記式(1)から算出することができる。
被形状転写層形成工程は、電離線照射処理工程で形成した電離線照射処理基板の電離線照射処理面上に、光又は熱の作用により硬化する硬化性組成物からなる被形状転写層を形成する工程である。図1は、電離線照射処理基板上に被形状転写層を形成した後の状態の一例を示す模式図である。被形状転写層形成工程は、図1に示すように、電離線照射処理基板1の電離線照射処理面上に被形状転写層2を形成する工程である。
硬化性組成物(1)に含有される(A)少なくとも1つの反応性基を有し、フッ素原子を含有する化合物として、具体的には、トリフルオロメチル(メタ)アクリレート、2,2,2−トリフルオロエチル(メタ)アクリレート、パーフルオロエチル(メタ)アクリレート、パーフルオロn−プロピル(メタ)アクリレート、パーフルオロi−プロピル(メタ)アクリレート、パーフルオロn−ブチル(メタ)アクリレート、パーフルオロi−ブチル(メタ)アクリレート、パーフルオロt−ブチル(メタ)アクリレート、パーフルオロシクロヘキシル(メタ)アクリレート、2−(1,1,1,3,3,3−ヘキサフルオロ)プロピル(メタ)アクリレート、1−(2,2,3,3,4,4,5,5−オクタフルオロ)ペンチル(メタ)アクリレート、1−(2,2,3,3,4,4,5,5−オクタフルオロ)ヘキシル(メタ)アクリレート、パーフルオロシクロヘキシルメチル(メタ)アクリレート、1−(2,2,3,3,3−ペンタフルオロ)プロピル(メタ)アクリレート、1−(2,2,3,3,4,4,4−ヘプタフルオロ)ペンチル(メタ)アクリレート、1−(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10−ヘプタデカフルオロ)デシル(メタ)アクリレート、1−(5−トリフルオロメチル−3,3,4,4,5,6,6,6−オクタフルオロ)ヘキシル(メタ)アクリレート等を挙げることができる。
硬化性組成物(2)に含有される25℃、1atmの条件下において、光又は熱により気体を発生する気体発生剤(A)として、具体的には、式(3)で表される化合物や、式(4)で表される化合物を挙げることができる。
硬化性組成物(3)に含有される一般式(2)で表される置換基を有する化合物(A)として、具体的には、2−(3,3,3−トリフルオロ−2−(トリフルオロメチル)−2−(2−(ビニロキシ)エトキシ)プロピル)ビシクロ[2.2.1]ヘプタン、2−(3,3,3−トリフルオロ−2−(トリフルオロメチル)−2−(2−(ビニロキシ)エトキシ)プロピル)アダマンタン、2−(3,3,3−トリフルオロ−2−(トリフルオロメチル)−2−(2−(ビニロキシ)エトキシ)プロピル)トリシクロ[5.2.1.02,6]デカン、2−(3,3,3−トリフルオロ−2−(トリフルオロメチル)−2−(2−(ビニロキシ)エトキシ)プロピル)テトラシクロ[6.2.1.13,6.02,7]ドデカン等を挙げることができる。
圧接工程は、被形状転写層にスタンパを圧接する工程である。図2は、被形状転写層にスタンパを圧接している状態の一例を示す模式図である。図2に示すように、被形状転写層形成工程で形成した被形状転写層2にスタンパ3を圧接することで、被形状転写層2中に、スタンパ3の凹凸パターンが形成される。
露光工程は、スタンパを圧接したまま被形状転写層を露光する工程である。図3は、スタンパを圧接したまま被形状転写層を露光している状態の一例を示す模式図である。図3に示すように、被形状転写層3を露光することにより、スタンパ2の凹凸パターンが被形状転写層3に転写される。このように凹凸パターンが転写されることで、例えば、LSI、システムLSI、DRAM、SDRAM、RDRAM、D−RDRAM等の半導体素子の層間絶縁膜用膜、半導体素子製造時におけるレジスト膜等として利用することができる。
剥離工程は、スタンパ3を被形状転写層2から剥離する工程である。図4は、スタンパを形状転写層から剥離した後の状態の一例を示す模式図である。剥離工程はどのようにして行ってもよく、剥離に際する各種条件等も特に限定されない。即ち、例えば、電離線照射処理基板1を固定してスタンパを電離線照射処理基板1から遠ざかるように移動させて剥離してもよく、スタンパを固定して電離線照射処理基板1をスタンパから遠ざかるように移動させて剥離してもよく、これらの両方を逆方向へ引っ張って剥離してもよい。
エッチング工程は、形状転写層の残部の凹部をエッチングにより取り除く工程である。図5は、エッチングを行った後の状態の一例を示す模式図である。図5に示すように、エッチング処理を行うことで、形状転写層のパターン形状のうち、不要な部分を取り除き、所望のレジストパターン10を形成することができる。
本発明の半導体素子は、「I.パターン形成方法」に記載のパターン形成方法によって得られるレジストパターンが形成された基板を用いたものであり、基板上に形成するレジストパターンの高さのバラツキが改善されているので、歩留まりを抑制することができる。
1,9−ノナンジオールジアクリレート(下記式(5)で表される化合物)50部、トリシクロデカンジメタノールアクリレート(下記式(6)で表される化合物)10部、イソボルニルアクリレート(下記式(7)で表される化合物)40部、2−(ジメチルアミノ)−2−(4−メチルベンジル)−1−(4−モルフォリン−4−イル−フェニル)−ブタン−1−オン(下記式(8)で表される化合物)7.5部、2−メチル−1−[4−(メチルチオ)フェニル]−2−モルフォリノプロパン−1−オン(下記式(9)で表される化合物)7.5部を混合することで、硬化性組成物を調製した。なお、調製した硬化性組成物の25℃における粘度は、12mPa・sであった。
コータ/デベロッパ(商品名「CLEAN TRACK ACT8」、東京エレクトロン社製)を用いて、8インチシリコンウエハの表面に、膜厚300nmの有機下層膜(商品名「NFC CT08」、JSR社製)を形成した。次いで、膜厚45nmの無機中間膜(商品名「NFC SOG08」、JSR社製)を形成し、コロナ放電処理装置(商品名「高周波電源AGF−012」、春日電機社製)を用いて、400W・min/m2のコロナ放電処理量で照射し、その後、四分割してコロナ処理基板(電離線照射処理基板)とした。その後、調製した硬化性組成物をコロナ処理基板のコロナ放電面(電離線照射処理面)の中心に約50μLスポットし、簡易インプリント装置(EUN−4200、エンジニアリングシステム社製)のワークステージに設置した。一方、離型剤(商品名「HD−1100Z」、ダイキン化成社製)を所定の方法であらかじめ塗布した石英テンプレート(NIM−PH350、NTT−ATN社製)を、シリコーンゴム(厚さ0.2mm)を接着層として、簡易インプリント装置の石英製露光ヘッドへ貼り付けた。次いで、簡易インプリント装置の圧力を0.2MPaとした後、露光ヘッドを下降し、テンプレートとコロナ処理基板とを、硬化性組成物を介して密着させた後、UV露光を15秒間実施した。15秒後に露光ステージを上昇し、テンプレートを硬化した形状転写層から剥離し、レジストパターンを形成した。形成したレジストパターンのパターンの高さのバラツキの評価は「きわめて良好」であった。
コロナ放電処理量を表1に記載した処理量としたこと以外は実施例1と同様にしてレジストパターンを形成した。形成したレジストパターンのパターンの高さのバラツキの評価を表1に併せて記載する。
Claims (6)
- (1)被加工基板の表面を電離線照射処理し、電離線照射処理面を有する電離線照射処理基板を形成する工程と、
(2)前記電離線照射処理面上に、光又は熱の作用により硬化する硬化性組成物からなる被形状転写層を形成する工程と、
(3)前記被形状転写層にスタンパを圧接する工程と、
(4)前記スタンパを圧接したまま前記被形状転写層を露光する工程と、
(5)前記スタンパを前記被形状転写層から剥離して、レジストパターンが形成された基板を得る工程と、を含むパターン形成方法。 - 前記被加工基板の前記表面に、ポリシロキサンからなる下層膜が形成されている請求項1に記載のパターン形成方法。
- 前記電離線照射処理が、コロナ放電処理である請求項1又は2に記載のパターン形成方法。
- 前記被加工基板の前記表面を、100W・min/m2以上のコロナ放電処理量でコロナ放電処理する請求項3に記載のパターン形成方法。
- 前記硬化性組成物が、光硬化性組成物である請求項1〜4のいずれか一項に記載のパターン形成方法。
- 請求項1〜5のいずれか一項に記載のパターン形成方法によって得られるレジストパターンが形成された基板を用いた半導体素子。
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