JP6534959B2 - 有機膜の形成方法及び半導体装置用基板の製造方法 - Google Patents
有機膜の形成方法及び半導体装置用基板の製造方法 Download PDFInfo
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- JP6534959B2 JP6534959B2 JP2016085123A JP2016085123A JP6534959B2 JP 6534959 B2 JP6534959 B2 JP 6534959B2 JP 2016085123 A JP2016085123 A JP 2016085123A JP 2016085123 A JP2016085123 A JP 2016085123A JP 6534959 B2 JP6534959 B2 JP 6534959B2
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Description
以下、図面を参照しながら、本発明を説明する。
図1は本発明の有機膜の形成方法でスペースパターンを有する基板上に有機膜を形成する一例のフロー図である。図1の方法では、まず、基板1上に有機膜形成用組成物を回転塗布(スピンコート)し、塗布膜2を形成する。このとき、基板1上の凹凸のパターンの影響で基板形状に追従した形で凹凸のある塗布膜2が形成される(図1(A))。この塗布膜2は、回転塗布時に揮発することができずに残ってしまった溶剤と樹脂等からなっている。この塗布膜が形成された基板に振動を加える処理を行う。基板1を振動させることで、この塗布膜2に振動を与えると、塗布膜2の液状化が起こり、塗布膜2(主に塗布膜2中の樹脂)が流動する(図1(B))。結果として凹凸が解消され、平坦な塗布膜2が形成される(図1(C))。最後に、この平坦な塗布膜2を熱、光、又は両方の処理により不溶化して平坦な有機膜3を形成することができる(図1(D))。そして、この不溶化された有機膜3上には、例えば後述のケイ素含有レジスト下層膜形成用組成物などの塗布膜形成用組成物を回転塗布して塗布膜を形成することができる。なお、図1の方法では、塗布膜2を形成した後、塗布膜2の不溶化処理前に、基板1に振動を加える処理を行っているが、基板1に振動を加える処理は、塗布膜2の形成後、不溶化処理と同時に行ってもよい。
本発明の有機膜の形成方法では、まず凹凸のパターンを有する基板上に有機膜形成用組成物を回転塗布して塗布膜を形成する。凹凸のパターンを有する基板としては、特に限定されず、例えばスペースパターンやラインパターンを有する基板などを用いることができる。また、本発明で用いる有機膜形成用組成物は、特に限定されないが、芳香環を含む樹脂が含まれる有機膜形成用組成物を用いることが好ましい。なお、回転塗布は、特に限定されず、スピンコーター等を用いて公知の方法で行えばよい。
本発明の有機膜の形成方法では、塗布膜を形成した後、前記不溶化処理の前又は前記不溶化処理と同時に前記基板に振動を加える処理を行う。図3は振動を加える処理の一例を示す説明図である。基板に振動を加える方法としては、例えば、基板上に塗布膜を形成後、振動発生装置5の振動面6を塗布膜形成後の基板4に密着させ、空圧や電動で塗布膜形成後の基板4を振動させる方法を例示できる。例えば、超音波発振器による超音波を振動子を介して、基板に伝播させるようにすることができる。
本発明の有機膜の形成方法では、塗布膜を形成した後、該塗布膜を有機溶剤に対して不溶化処理する。不溶化処理は、50℃以上500℃以下の熱処理、波長が400nm以下の紫外線照射処理、及び電子線照射処理のいずれか、又はこれらの組み合わせであることが好ましい。このような手段で不溶化処理を行うことで、平坦な状態を保持している有機膜を形成することができる。
本発明では、凹凸のパターンを有する基板上に上述の本発明の有機膜の形成方法で有機膜を形成し、該有機膜上にケイ素を含有するレジスト下層膜形成用組成物を用いてケイ素含有レジスト下層膜を形成し、該ケイ素含有レジスト下層膜上にフォトレジスト組成物を用いてレジスト上層膜を形成し、該レジスト上層膜に回路パターンを形成し、該パターンが形成されたレジスト上層膜をマスクにして前記ケイ素含有レジスト下層膜にドライエッチングでパターンを転写し、該パターンが転写されたケイ素含有レジスト下層膜をマスクにして前記有機膜にドライエッチングでパターンを転写し、さらに該パターンが転写された有機膜をマスクにして前記基板にドライエッチングでパターンを転写する半導体装置用基板の製造方法を提供する。
300mlのフラスコにフルオレンビスフェノール200g、37%ホルマリン水溶液75g、シュウ酸5gを入れ、撹拌しながら100℃で24時間反応させた。反応後、メチルイソブチルケトン500mlに溶解させ、十分な水洗により触媒と金属不純物を除去した。次いで、溶媒を減圧除去し、150℃、2mmHgまで減圧し、水分、未反応モノマーを除いて135gの下記に示すポリマー1を得た。GPCにより分子量(Mw)、分散度(Mw/Mn)を求めた。
分子量(Mw)6,500
分散度(Mw/Mn)=5.20
10質量部の上記ポリマー1を、FC−430(住友スリーエム社製)0.1質量%を含むプロピレングリコールモノメチルエーテルアセテート(以下PGMEA)100質量部に溶解させ、0.1μmのフッ素樹脂製のフィルターで濾過することによって有機膜形成用組成物溶液(SOL−1)を調製した。
二酸化ケイ素で高さ0.1μm、幅1mmの凹凸のパターンが形成されているシリコン基板Aを準備した。この基板A上に、SOL−1を回転塗布して塗布膜を形成後、基板に38kHzの発信周波数の振動を5分間与えた(振動処理)後、300℃で60秒間ベークし有機膜を形成した。パターンのある部分とない部分を接触式段差計αステップ(KLA社製)で平坦度を測定した。結果を表1に示す。
二酸化ケイ素で高さ0.1μm、ハーフピッチ50nmのパターンと50nmのスペースからなる繰り返しパターンが1mmの範囲で繰り返し形成されている基板Bを準備した。基板Bを用いる以外は実施例1と同様にして有機膜を形成し、平坦度を測定した。結果を表1に示す。
基板Aを用いて、実施例1と同様に塗布膜を形成後、上記振動処理を行わず300℃で60秒間ベークし有機膜を形成した。実施例1と同様にして、平坦度を測定した。結果を表1に示す。
基板Aのかわりに基板Bを用いる以外は比較例1と同様にして有機膜を形成し、平坦度を測定した。結果を表1に示す。
5…振動発生装置、 6…振動面
Claims (12)
- 凹凸のパターンを有する基板上に有機膜形成用組成物を回転塗布して塗布膜を形成した後、該塗布膜を有機溶剤に対して不溶化処理することで、多層レジストプロセスにおいてレジスト上層膜のパターンを基板に転写するための有機膜を形成する方法であって、前記塗布膜を形成した後、前記不溶化処理の前又は前記不溶化処理と同時に前記基板に振動を加える処理を行う有機膜の形成方法であり、かつ、
前記有機膜形成用組成物として、芳香環を含む樹脂が含まれるものを用いることを特徴とする有機膜の形成方法。 - 前記振動を加える処理において、振動数が0.01Hzから10GHzの振動を加えることを特徴とする請求項1に記載の有機膜の形成方法。
- 前記不溶化処理が、50℃以上500℃以下の熱処理、波長が400nm以下の紫外線照射処理、及び電子線照射処理のいずれか、又はこれらの組み合わせであることを特徴とする請求項1又は請求項2に記載の有機膜の形成方法。
- 半導体装置用基板の製造方法であって、凹凸のパターンを有する基板上に請求項1から請求項3のいずれか一項に記載の方法で有機膜を形成し、該有機膜上にケイ素を含有するレジスト下層膜形成用組成物を用いてケイ素含有レジスト下層膜を形成し、該ケイ素含有レジスト下層膜上にフォトレジスト組成物を用いてレジスト上層膜を形成し、該レジスト上層膜に回路パターンを形成し、該パターンが形成されたレジスト上層膜をマスクにして前記ケイ素含有レジスト下層膜にドライエッチングでパターンを転写し、該パターンが転写されたケイ素含有レジスト下層膜をマスクにして前記有機膜にドライエッチングでパターンを転写し、さらに該パターンが転写された有機膜をマスクにして前記基板にドライエッチングでパターンを転写することを特徴とする半導体装置用基板の製造方法。
- 半導体装置用基板の製造方法であって、凹凸のパターンを有する基板上に請求項1から請求項3のいずれか一項に記載の方法で有機膜を形成し、該有機膜上にケイ素を含有するレジスト下層膜形成用組成物を用いてケイ素含有レジスト下層膜を形成し、該ケイ素含有レジスト下層膜上に有機反射防止膜を形成し、該有機反射防止膜上にフォトレジスト組成物を用いてレジスト上層膜を形成して4層レジスト膜とし、前記レジスト上層膜に回路パターンを形成し、該パターンが形成されたレジスト上層膜をマスクにして前記有機反射防止膜と前記ケイ素含有レジスト下層膜にドライエッチングでパターンを転写し、該パターンが転写された有機反射防止膜とケイ素含有レジスト下層膜をマスクにして前記有機膜にドライエッチングでパターンを転写し、さらに該パターンが転写された有機膜をマスクにして前記基板にドライエッチングでパターンを転写することを特徴とする半導体装置用基板の製造方法。
- 半導体装置用基板の製造方法であって、凹凸のパターンを有する基板上に請求項1から請求項3のいずれか一項に記載の方法で有機膜を形成し、該有機膜上に酸化ケイ素膜、窒化ケイ素膜、酸化窒化ケイ素膜、アモルファスケイ素膜、及び窒化チタン膜から選ばれる無機ハードマスクを形成し、該無機ハードマスク上にフォトレジスト組成物を用いてレジスト上層膜を形成し、該レジスト上層膜に回路パターンを形成し、該パターンが形成されたレジスト上層膜をマスクにして前記無機ハードマスクにドライエッチングでパターンを転写し、該パターンが転写された無機ハードマスクをマスクにして有機膜にドライエッチングでパターンを転写し、さらに該パターンが転写された有機膜をマスクにして前記基板にドライエッチングでパターンを転写することを特徴とする半導体装置用基板の製造方法。
- 半導体装置用基板の製造方法であって、凹凸のパターンを有する基板上に請求項1から請求項3のいずれか一項に記載の方法で有機膜を形成し、該有機膜上に酸化ケイ素膜、窒化ケイ素膜、酸化窒化ケイ素膜、アモルファスケイ素膜、及び窒化チタン膜から選ばれる無機ハードマスクを形成し、該無機ハードマスク上に有機膜とケイ素含有レジスト下層膜からなる多層レジスト膜又は有機反射防止膜を形成し、該多層レジスト膜又は有機反射防止膜上にフォトレジスト組成物を用いてレジスト上層膜を形成し、該レジスト上層膜に回路パターンを形成し、該パターンが形成されたレジスト上層膜をマスクにして前記多層レジスト膜又は前記有機反射防止膜へのパターン転写を経由して前記無機ハードマスクに前記パターンをドライエッチングで転写し、該パターンが転写された無機ハードマスクをマスクにして前記基板上に形成された有機膜にドライエッチングでパターンを転写し、さらに該パターンが転写された有機膜をマスクにして前記基板にドライエッチングでパターンを転写することを特徴とする半導体装置用基板の製造方法。
- 前記無機ハードマスクの形成を、CVD法又はALD法によって行うことを特徴とする請求項6又は請求項7に記載の半導体装置用基板の製造方法。
- 前記回路パターンの形成において、波長が10nm以上300nm以下の高エネルギー線によるリソグラフィー、電子線による直接描画、及びナノインプリンティングのいずれか、又はこれらの組み合わせによって回路パターンを形成することを特徴とする請求項4から請求項8のいずれか一項に記載の半導体装置用基板の製造方法。
- 前記回路パターンの形成において、アルカリ現像又は有機溶剤による現像で回路パターンを現像することを特徴とする請求項4から請求項9のいずれか一項に記載の半導体装置用基板の製造方法。
- 前記基板が、金属膜、金属炭化膜、金属酸化膜、金属窒化膜、又は金属酸化窒化膜を含むものであることを特徴とする請求項4から請求項10のいずれか一項に記載の半導体装置用基板の製造方法。
- 前記基板を構成する金属が、ケイ素、チタン、タングステン、ハフニウム、ジルコニウム、クロム、ゲルマニウム、銅、アルミニウム、インジウム、ガリウム、ヒ素、パラジウム、鉄、タンタル、イリジウム、モリブデン、又はこれらの合金であることを特徴とする請求項11に記載の半導体装置用基板の製造方法。
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