JP5778568B2 - 厚膜用化学増幅型ポジ型ホトレジスト組成物、厚膜ホトレジスト積層体、厚膜ホトレジストパターンの製造方法及び接続端子の製造方法 - Google Patents
厚膜用化学増幅型ポジ型ホトレジスト組成物、厚膜ホトレジスト積層体、厚膜ホトレジストパターンの製造方法及び接続端子の製造方法 Download PDFInfo
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- JP5778568B2 JP5778568B2 JP2011276381A JP2011276381A JP5778568B2 JP 5778568 B2 JP5778568 B2 JP 5778568B2 JP 2011276381 A JP2011276381 A JP 2011276381A JP 2011276381 A JP2011276381 A JP 2011276381A JP 5778568 B2 JP5778568 B2 JP 5778568B2
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Description
本発明に係る厚膜用化学増幅型ポジ型ホトレジスト組成物(以下、単に「ホトレジスト組成物」という。)は、活性光線又は放射線の照射により酸を発生する酸発生剤(A)と、酸の作用によりアルカリに対する溶解性が増大する樹脂(B)と、有機溶剤(S)とを少なくとも含有するものである。このホトレジスト組成物は、回路基板、及び回路基板に実装するCSP(チップサイズパッケージ)等の電子部品の製造において、バンプやメタルポスト等の接続端子、あるいは配線パターン等の形成に好適に用いられる。以下、本発明に係るホトレジスト組成物に含有される各成分について詳述する。
本発明に用いられる酸発生剤(A)は、活性光線又は放射線の照射により酸を発生する化合物であり、光により直接又は間接的に酸を発生する化合物であれば特に限定されない。
酸の作用によりアルカリに対する溶解性が増大する樹脂(B)としては、特に限定されず、酸の作用によりアルカリに対する溶解性が増大する任意の樹脂を用いることができる。その中でも、ノボラック樹脂(B1)、ポリヒドロキシスチレン樹脂(B2)、及びアクリル樹脂(B3)からなる群より選ばれる少なくとも1種の樹脂を含有することが好ましい。
ノボラック樹脂(B1)としては、下記一般式(b1)で表される構成単位を含む樹脂を使用することができる。
ポリヒドロキシスチレン樹脂(B2)としては、下記一般式(b4)で表される構成単位を含む樹脂を使用することができる。
アクリル樹脂(B3)としては、下記一般式(b5)〜(b7)で表される構成単位を含む樹脂を使用することができる。
本発明に係るホトレジスト組成物は、クラック耐性を向上させるため、さらにアルカリ可溶性樹脂(C)を含有することが好ましい。ここで、アルカリ可溶性樹脂とは、樹脂濃度20質量%の樹脂溶液(溶媒:プロピレングリコールモノメチルエーテルアセテート)により、膜厚1μmの樹脂膜を基板上に形成し、2.38質量%のTMAH水溶液に1分間浸漬した際、0.01μm以上溶解するものをいう。アルカリ可溶性樹脂(C)としては、ノボラック樹脂(C1)、ポリヒドロキシスチレン樹脂(C2)、及びアクリル樹脂(C3)からなる群より選ばれる少なくとも1種の樹脂であることが好ましい。
ノボラック樹脂(C1)は、例えばフェノール性水酸基を有する芳香族化合物(以下、単に「フェノール類」という。)とアルデヒド類とを酸触媒下で付加縮合させることにより得られる。
上記アルデヒド類としては、例えば、ホルムアルデヒド、フルフラール、ベンズアルデヒド、ニトロベンズアルデヒド、アセトアルデヒド等が挙げられる。
付加縮合反応時の触媒は、特に限定されるものではないが、例えば酸触媒では、塩酸、硝酸、硫酸、蟻酸、シュウ酸、酢酸等が使用される。
ポリヒドロキシスチレン樹脂(C2)を構成するヒドロキシスチレン系化合物としては、p−ヒドロキシスチレン、α−メチルヒドロキシスチレン、α−エチルヒドロキシスチレン等が挙げられる。
さらに、ポリヒドロキシスチレン樹脂(C2)は、スチレン樹脂との共重合体とすることが好ましい。このようなスチレン樹脂を構成するスチレン系化合物としては、スチレン、クロロスチレン、クロロメチルスチレン、ビニルトルエン、α−メチルスチレン等が挙げられる。
アクリル樹脂(C3)としては、エーテル結合を有する重合性化合物から誘導された構成単位、及びカルボキシル基を有する重合性化合物から誘導された構成単位を含むことが好ましい。
本発明に係るホトレジスト組成物は、ホトレジストパターン形状、引き置き安定性等の向上のため、さらに酸拡散制御剤(D)を含有することが好ましい。酸拡散制御剤(D)としては、含窒素化合物(D1)が好ましく、さらに必要に応じて、有機カルボン酸、又はリンのオキソ酸若しくはその誘導体(D2)を含有させることができる。
含窒素化合物(D1)としては、トリメチルアミン、ジエチルアミン、トリエチルアミン、ジ−n−プロピルアミン、トリ−n−プロピルアミン、トリ−n−ペンチルアミン、トリベンジルアミン、ジエタノールアミン、トリエタノールアミン、n−ヘキシルアミン、n−ヘプチルアミン、n−オクチルアミン、n−ノニルアミン、エチレンジアミン、N,N,N’,N’−テトラメチルエチレンジアミン、テトラメチレンジアミン、ヘキサメチレンジアミン、4,4’−ジアミノジフェニルメタン、4,4’−ジアミノジフェニルエーテル、4,4’−ジアミノベンゾフェノン、4,4’−ジアミノジフェニルアミン、ホルムアミド、N−メチルホルムアミド、N,N−ジメチルホルムアミド、アセトアミド、N−メチルアセトアミド、N,N−ジメチルアセトアミド、プロピオンアミド、ベンズアミド、ピロリドン、N−メチルピロリドン、メチルウレア、1,1−ジメチルウレア、1,3−ジメチルウレア、1,1,3,3,−テトラメチルウレア、1,3−ジフェニルウレア、イミダゾール、ベンズイミダゾール、4−メチルイミダゾール、8−オキシキノリン、アクリジン、プリン、ピロリジン、ピペリジン、2,4,6−トリ(2−ピリジル)−S−トリアジン、モルホリン、4−メチルモルホリン、ピペラジン、1,4−ジメチルピペラジン、1,4−ジアザビシクロ[2.2.2]オクタン、ピリジン等を挙げることができる。これらは単独で用いてもよく、2種以上を組み合わせて用いてもよい。
有機カルボン酸、又はリンのオキソ酸若しくはその誘導体(D2)のうち、有機カルボン酸としては、具体的には、マロン酸、クエン酸、リンゴ酸、コハク酸、安息香酸、サリチル酸等が好適であり、特にサリチル酸が好ましい。
本発明に係るホトレジスト組成物は、有機溶剤(S)として、プロピレングリコールモノメチルエーテルと3−メトキシブチルアセテートとを60:40〜20:80の質量比で混合した混合溶剤を用いる。プロピレングリコールモノメチルエーテルアセテートに3−メトキシブチルアセテートを上記の範囲の比で混合することにより、塗布後プリベークの際に泡かみが生じにくく、かつ良好な厚膜ホトレジストパターンの形成が可能となる。
本発明に係るホトレジスト組成物は、可塑性を向上させるため、さらにポリビニル樹脂を含有していてもよい。ポリビニル樹脂の具体例としては、ポリ塩化ビニル、ポリスチレン、ポリヒドロキシスチレン、ポリ酢酸ビニル、ポリビニル安息香酸、ポリビニルメチルエーテル、ポリビニルエチルエーテル、ポリビニルアルコール、ポリビニルピロリドン、ポリビニルフェノール、及びこれらの共重合体等が挙げられる。ポリビニル樹脂は、ガラス転移点の低さの点から、好ましくはポリビニルメチルエーテルである。
本発明に係るホトレジスト組成物の調製は、上記各成分を通常の方法で混合、撹拌するだけでよく、必要に応じ、ディゾルバー、ホモジナイザー、3本ロールミル等の分散機を用いて分散、混合してもよい。また、混合した後で、さらにメッシュ、メンブランフィルタ等を用いて濾過してもよい。
本発明の厚膜ホトレジスト積層体は、支持体上に前記厚膜用化学増幅型ポジ型ホトレジスト組成物からなる厚膜ホトレジスト層が積層されているものである。支持体としては、特に限定されず、従来公知のものを用いることができ、例えば、電子部品用の基板や、これに所定の配線パターンが形成されたもの等を例示することができる。該基板としては、例えば、シリコン、窒化シリコン、チタン、タンタル、パラジウム、チタンタングステン、銅、クロム、鉄、アルミニウム等の金属製の基板やガラス基板等が挙げられる。配線パターンの材料としては、例えば銅、ハンダ、クロム、アルミニウム、ニッケル、金等が用いられる。
本発明に係る厚膜ホトレジストパターンの製造方法は、支持体上に本発明に係るホトレジスト組成物からなる厚膜ホトレジスト層を積層する積層工程と、この厚膜ホトレジスト層に、活性光線又は放射線を照射する露光工程と、露光後の厚膜ホトレジスト層を現像して厚膜ホトレジストパターンを得る現像工程と、を含むものである。
上記のようにして得られた厚膜ホトレジストパターンの非レジスト部(現像液で除去された部分)に、メッキ等によって金属等の導体を埋め込むことにより、バンプやメタルポスト等の接続端子を形成することができる。なお、メッキ処理方法は特に制限されず、従来から公知の各種方法を採用することができる。メッキ液としては、特にハンダメッキ、銅メッキ、金メッキ、ニッケルメッキ液が好適に用いられる。残っている厚膜ホトレジストパターンは、最後に、定法に従って剥離液等を用いて除去する。
表1に示す各成分を有機溶剤に均一に溶解し、孔径1μmのメンブランフィルタを通してろ過し、固形分濃度48質量%となるようにホトレジスト組成物を調製した。表1中の( )内の数値は各成分の質量部を表す。調製したホトレジスト組成物の粘度は4000cPであった。
ZB−3:アクリル樹脂(アクリル酸単位:メトキシポリエチレングリコールアクリレート単位:メチルアダマンチルアクリレート単位=10:30:60(モル比)、分子量5万)
ZB−4:ノボラック樹脂(m/p−クレゾール=6/4とホルムアルデヒド及び酸触媒の存在下で付加縮合して得たノボラック樹脂の水酸基の10%をエチルビニルエーテルで保護したもの、分子量2万)
ZB−5:アクリル樹脂(アクリル酸単位:メチルアクリレート単位:メトキシトリエチレングリコールアクリレート単位:シクロヘキシルアクリレート単位:エチルシクロヘキシルアクリレート=10:10:10:30:40(モル比)、分子量20万)
ZC−1:ノボラック樹脂(m/p−クレゾール=6/4とホルムアルデヒド及び酸触媒の存在下で付加縮合して得たもの、分子量8000)
ZC−2:ポリヒドロキシスチレン樹脂(VP−2500:日本曹達社製、分子量3000)
PGMEA:プロピレングリコールモノメチルエーテルアセテート
MA:3−メトキシブチルアセテート
HP:2−ヘプタノン
PGME:プロピレングリコールモノメチルエーテル
EL:乳酸エチル
CH:シクロヘキサノン
BA:酢酸ブチル
TPA:トリ−n−ペンチルアミン
[泡かみ評価]
上記実施例1〜12、比較例1〜8で調製したホトレジスト組成物を、スピンコーターを用いて8インチのシリコン基板(2cm間隔で格子状にスクラブライン加工、80μmの深さ)上に塗布し、膜厚50μmの厚膜ホトレジスト層を得た。そして、この厚膜ホトレジスト層を140℃で5分間プリベークした。プリベーク後、ホトレジスト膜表面全体に発生した100μm径以上の泡の数を目視で数えた。結果を表2に示す。
上記実施例1〜3、比較例1〜4で調製したホトレジスト組成物を、スピンコーターを用いて8インチの銅基板上に塗布し、膜厚50μmの厚膜ホトレジスト層を得た。そして、この厚膜ホトレジスト層を140℃で5分間プリベークした。プリベーク後、所定ホールパターンのマスクと露光装置Prisma GHI(Ultratech社製)を用いて、ghi線でパターン露光した。次いで、基板をホットプレート上に載置して80℃で3分間の露光後加熱(PEB)を行った。その後、2.38%テトラメチルアンモニウム水酸化物(TMAH)水溶液を厚膜ホトレジスト層に滴下して、23℃で60秒間放置し、これを3回繰り返して現像した。その後、流水洗浄し、窒素ブローして40μmのコンタクトホールパターンを有する厚膜レジストパターンを得た。このコンタクトホールパターンの断面形状を走査型電子顕微鏡にて確認した。評価結果は、断面形状が矩形だったものを◎、テーパー形状気味だが、使用には耐えられる形状を○、テーパー形状を×とした。結果を表3に示す。
Claims (7)
- 支持体上に厚膜ホトレジスト層を形成するために用いられる厚膜用化学増幅型ポジ型ホトレジスト組成物であって、
活性光線又は放射線の照射により酸を発生する酸発生剤(A)と、酸の作用によりアルカリに対する溶解性が増大する樹脂(B)と、有機溶剤(S)とを含有し、
前記有機溶剤(S)が、プロピレングリコールモノメチルエーテルアセテートと3−メトキシブチルアセテートとを60:40〜20:80の質量比で混合した混合溶剤である厚膜用化学増幅型ポジ型ホトレジスト組成物。 - さらに、アルカリ可溶性樹脂(C)を含有する請求項1に記載の厚膜用化学増幅型ポジ型ホトレジスト組成物。
- 前記アルカリ可溶性樹脂(C)が、ノボラック樹脂(C1)、ポリヒドロキシスチレン樹脂(C2)、及びアクリル樹脂(C3)からなる群より選ばれる少なくとも1種の樹脂を含む請求項2に記載の厚膜用化学増幅型ポジ型ホトレジスト組成物。
- さらに、酸拡散制御剤(D)を含有する請求項1から3のいずれか1項に記載の厚膜用化学増幅型ポジ型ホトレジスト組成物。
- 支持体と、請求項1から4のいずれか1項に記載の厚膜用化学増幅型ポジ型ホトレジスト組成物からなる厚膜ホトレジスト層とが積層されていることを特徴とする厚膜ホトレジスト積層体。
- 支持体上に、請求項1から4のいずれか1項に記載の厚膜用化学増幅型ポジ型ホトレジスト組成物からなる厚膜ホトレジスト層を積層する積層工程と、
前記厚膜ホトレジスト層に、活性光線又は放射線を照射する露光工程と、
露光後の前記厚膜ホトレジスト層を現像して厚膜ホトレジストパターンを得る現像工程と、
を含む厚膜ホトレジストパターンの製造方法。 - 請求項6に記載の厚膜ホトレジストパターン製造方法により得られる厚膜ホトレジストパターンの非レジスト部に、導体からなる接続端子を形成する工程を含むことを特徴とする接続端子の製造方法。
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| JP2014021249A (ja) * | 2012-07-18 | 2014-02-03 | Sumitomo Chemical Co Ltd | レジスト組成物及びレジストパターンの製造方法 |
| JP6564196B2 (ja) * | 2014-03-20 | 2019-08-21 | 東京応化工業株式会社 | 厚膜用化学増幅型ポジ型感光性樹脂組成物 |
| KR102129049B1 (ko) | 2017-09-11 | 2020-07-01 | 주식회사 엘지화학 | 광산 발생제 및 이를 포함하는 후막용 화학 증폭형 포지티브 타입 포토레지스트 조성물 |
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| JP7488102B2 (ja) * | 2019-05-17 | 2024-05-21 | 住友化学株式会社 | 塩、クエンチャー、レジスト組成物及びレジストパターンの製造方法 |
| KR102863895B1 (ko) | 2019-11-14 | 2025-09-23 | 메르크 파텐트 게엠베하 | 알칼리-가용성 아크릴 수지를 포함하는 dnq-타입 포토레지스트 조성물 |
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