JP6395730B2 - 接着フィルム及び接着フィルムを用いた半導体パッケージ - Google Patents
接着フィルム及び接着フィルムを用いた半導体パッケージ Download PDFInfo
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- JP6395730B2 JP6395730B2 JP2015557252A JP2015557252A JP6395730B2 JP 6395730 B2 JP6395730 B2 JP 6395730B2 JP 2015557252 A JP2015557252 A JP 2015557252A JP 2015557252 A JP2015557252 A JP 2015557252A JP 6395730 B2 JP6395730 B2 JP 6395730B2
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- adhesive film
- adhesive
- film
- dicing tape
- resin
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Description
また、本発明は、前記(A)ビスマレイミド樹脂の含有量が1〜50質量%であり、前記(B)ラジカル開始剤の含有量が0.1〜5質量%であり、前記(C)メタクリル基または、/及び、アクリル基を有するシランカップリング剤の含有量が0.1〜5質量%であることを特徴とする上記接着フィルムに関する。
また、本発明は、上記接着フィルムを、ダイシングテープに積層してなることを特徴とする、ダイシングテープ付き接着フィルムに関する。
さらに、本発明は、上記ダイシングテープ付き接着フィルムを用いてなる半導体パッケージに関する。
本明細書において、「ビスマレイミド」または「BMI」とは、2つのマレイミド部分が連結されているポリイミド化合物を意味する。即ち、下記一般式(1)に示す一般構造を有するポリイミド化合物である。
一般式(1)
(A)ビスマレイミド樹脂の含有量としては、接着フィルム中の1〜50質量%の範囲であることが好ましい。
ラジカル開始剤としては、熱によりラジカル重合を開始させることが可能な化合物であればよく、特に制限されず、従来用いられているものを適宜用いることができる。例えば、1,2−ジメチルイミダゾール、2−フェニルイミダゾール、2,6−ルチジン、トリエチルアミン、m−ヒドロキシ安息香酸、2,4−ジヒドロキシ安息香酸、p−ヒドロキシフェニル酢酸、4−ヒドロキシフェニルプロピオン酸、ジクミルパーオキサイドや2,5−ジメチル−2,5−ジ(t−ブチルパーオキシ)ヘキシン等の過酸化物、2,3−ジメチル−2,3−ジフェニルブタン、3,4−ジメチル−3,4−ジフェニルヘキサンなどが挙げられる。
本発明において、カップリング剤は接着フィルムと被着体との接合を容易にする。原理的には、熱硬化性樹脂として配合する(A)ビスマレイミド樹脂、および(B)ラジカル開始剤に対して、(C)カップリング剤が化学的に反応し、接着フィルムのシリコンウエハに対する低温での粘着力性が著しく損なわれない範囲で緩やかに架橋することによって、ダイシングテープとの剥離強度(ピール強度)が低下することで、接着フィルム付きシリコンチップが容易にピックアップできるようになる。
尚、その効果は、メタクリル基または、/及び、アクリル基(以下、「(メタ)アクリル基」とする)を有するカップリング剤によってのみ発現するものであるが、接着フィルムのシリコンウエハに対する低温での粘着力性が著しく損なわれない範囲で緩やかに架橋することが望ましいことから、(メタ)アクリル基を有するカップリング剤が好ましい。
本発明において、フィルム状に形成しやすくするために、高分子成分を包含してもよい。
また、高分子成分は応力緩和性にさらに寄与することもできる。高分子成分は、取り扱いが容易であり、硬化性樹脂との適合性を有するものであればよい。好適な高分子成分の例としては、疎水性でありトルエンに可溶である熱可塑性樹脂が挙げられる。硬化性樹脂との適合性を有する場合、熱可塑性樹脂と硬化性樹脂の両方は同じ溶媒に可溶である場合が考えられ、このような溶媒としては芳香族溶媒が例えば挙げられる。有用な溶媒の例としてはトルエン及びキシレンが挙げられる。
本発明において、ビスマレイミド樹脂以外の硬化性成分を含有してもよい。硬化性成分としては、特に限定されない。例えば、分子内にアミド結合を有する(メタ)アクリレート化合物、酸変性(メタ)アクリレート、ビスフェノールA系(メタ)アクリレート、多価アルコールにα,β−不飽和カルボン酸を反応させて得られる化合物、グリシジル基含有化合物にα,β−不飽和カルボン酸を反応させて得られる化合物、分子内にウレタン結合を有する(メタ)アクリレート化合物等のウレタンモノマー、またはウレタンオリゴマーが挙げられ、これら以外にも、ノニルフェノキシポリオキシエチレンアクリレート、γ−クロロ−β−ヒドロキシプロピル−β’−(メタ)アクリロイルオキシエチル−o−フタレート、β−ヒドロキシアルキル−β’−(メタ)アクリロイルオキシアルキル−o−フタレート等のフタル酸系化合物、(メタ)アクリル酸アルキルエステル、EO変性ノニルフェニル(メタ)アクリレート等が例示可能である。
本発明においてフィラーを含有してもよい。フィラーを入れることで、フィラーに応じた機能を接着フィルムに付与することができる。一方、フィラーを入れない場合はフィルムの応力緩和性と流動性が高い点で優れる。フィラーは有機フィラー、無機フィラーまたは金属フィラーがある。有機フィラーはフィルムに靭性を付与できる点で好ましく、例えば、アクリル、ポリイミド、ポリアミドイミド、ポリエーテルエーテルケトン、ポリエーテルイミド、ポリエステルイミド、ナイロン、シリコーン等のフィラーが挙げられる。無機フィラーまたは金属フィラーは、取扱い性向上、熱伝導性向上、導電性付与、溶融粘度の調整及びチキソトロピック性付与などを向上させることができる。金属フィラーとしては、特に制限はなく、例えば金、銀、銅、アルミニウム、鉄、インジウム、錫等及びそれらの合金などが使用できる。無機フィラーとしては、特に制限はなく、例えば、水酸化アルミニウム、水酸化マグネシウム、炭酸カルシウム、炭酸マグネシウム、ケイ酸カルシウム、ケイ酸マグネシウム、酸化カルシウム、酸化マグネシウム、アルミナ、窒化アルミニウム、ほう酸アルミニウムウイスカ、窒化ほう素、結晶性シリカ、非晶性シリカ等が挙げられ、フィラーの形状についても特に制限はない。これらのフィラーは、単独で又は2種類以上を組み合わせて使用することができる。
フィラーが導電性を有する場合には、接着フィルムがフラックスを含有していることが好ましい。フラックスは導電性のフィラーの表面酸化膜を除去するために役立つ。フラックスとしては、硬化性樹脂やその他の硬化性樹脂の硬化反応を阻害しない化合物であれば特に制限なく使用することができる。たとえば、多価アルコール、カルボン酸、無機酸、アルカノールアミン類、フェノール類、ロジン、塩化物化合物及びその塩、ハロゲン化化合物およびその塩などが挙げられる。フラックスは1種のみを用いても良いし、2種以上を組み合わせて用いても良い。
特定の実施形態では、フラックスは、カルボン酸と第三級アミンの塩または混合物を含んで構成され、潜在性を有することができる。他の実施形態では、フラックスが接着フィルムの熱処理の終了時に不活性にされていることでき、その場合フラックスの官能基と硬化性樹脂が反応して組み込まれることで、不活性化される。
別の実施態様において、例えば可塑剤、油、安定化剤、酸化防止剤、腐食防止剤、インヒビター、キレート剤、顔料、染料、高分子添加物、消泡剤、防腐剤、増粘剤、レオロジー調整剤、保湿剤、粘着性付与剤、分散剤および水などの1種以上の添加剤をさらに含んでもよい。
本発明の接着フィルムは、(A)ビスマレイミド樹脂、(B)ラジカル開始剤、(C)メタクリル基または、/及び、アクリル基を有するカップリング剤を、溶媒(例えば、キシレン、シクロペンタノン等)に溶解・均一分散させることで得た接着剤組成物ワニスを、カバーフィルム上に所定厚みとなる様に塗布して塗布膜を形成した後、該塗布膜を所定条件下で乾燥させることで製造できる。塗布方法としては特に限定されず、例えば、ロール塗工、スクリーン塗工、グラビア塗工等が挙げられる。また、乾燥条件としては、例えば乾燥温度70〜160℃、乾燥時間1〜5分間の範囲内で行われる。カバーフィルムとしては、ポリエチレンテレフタレート(PET)、ポリエチレン、ポリプロピレンや、フッ素系剥離剤、長鎖アルキルアクリレート系剥離剤等の剥離剤により表面コートされたプラスチックフィルムや紙などが使用可能である。
図面を参照しながら本発明における半導体パッケージ製造方法の好適な実施形態について詳細に説明する。なお、以下の説明及び図面中、同一又は相当する要素には同一の符号を付し、重複する説明は省略する。図3〜図9は、本発明の半導体パッケージ製造方法の各工程の好適な一実施形態を示す概略縦断面図である。
なお、ウエハ1を細かく切ったものをチップ4と呼び分けることとする。
本発明においては、成分(A)および成分(B)に対して、成分(C)が化学的に反応し、接着剤層2のウエハ1に対する粘着性が著しく損なわれない範囲で緩やかに架橋することによって、接着剤層2とダイシングテープ3との間の剥離強度が低下することで、DAF残り(ピックアップ後、ウエハ1から剥離した接着層2がダイシングテープ3の上に残留する現象)が発生することなく、接着剤層付き半導体チップ4が容易にピックアップできるようになる。
このように、本発明のフィルム状接着剤からなる接着剤層2を介して接着剤層付き半導体チップ5を配線基板6上に実装することで、電子部品により生じる配線基板5上の凹凸に前記フィルム状接着剤を追従させることができるため、ウエハ1と配線基板6とを密着させて固定することが可能となる。
表2に示す各成分に対して、適量の溶媒を配合したワニスを50μm厚のPETフィルムからなるカバーテープに塗布し、乾燥して厚さ50μmのフィルム状接着剤組成物を形成した後、ダイシングテープと貼りあわせてダイシングテープ付き接着フィルムを調製した。
なお、各性能の評価方法は以下の通りである。
各サンプルにおけるダイシングテープと接着フィルムの間の剥離強度をJIS−Z0237に基づき測定した。標準状態(温度23℃、相対湿度50%)において、図9に示すスライド板201に固定用両面テープ103を介して接着フィルム105を貼合し、ダイシングテープ11の先端部を上部チャック203で固定した後、剥離角度90°、剥離速度50mm/minで引き剥がし、ダイシングテープと接着フィルムの間との剥離強度を求めた。
7.5×7.5mmにダイシングされた接着フィルム付きシリコンチップを、ダイボンディング装置(日立ハイテック社製、商品名DB−800)を用いて、突き上げピン数:5本、突き上げ高さ:300μm、突き上げ後保持時間:300msec にて100回ピックアップを行い、ピックアップ成功率を算出した。また、ウエハラミネート可能最低温度は、まず、マニュアルウエハマウンター(テクノビジョン社製、商品名FM−114)を用いて、予め所定温度に加熱されたミラーウエハ(8インチ×730μm厚)の表面に、20×100mmにカットした接着フィルムを、ローラー圧力0.3MPa、ローラー速度10mm/secでラミネートした。冷却後、室温にて接着フィルム表面のカバーフィルムを剥離し、気泡が入らないように注意しながら接着フィルムと同サイズの粘着テープ(寺岡製作所社製、商品名スプライジングテープNo.642)を貼合し、粘着テープを剥離させた際に、接着フィルムがミラーウエハの表面から剥離しなくなる温度をウエハラミネート可能最低温度として求めた。尚、温度はラミネート時のミラーウエハ表面の実測温度であり、これを10℃毎に変更して、接着フィルムがミラーウエハの表面から剥離しなくなる最低温度を求めた。それらの結果を表1の基準で判定した。
(1)絶縁性粒子:
球状シリカ(デンカ社製 商品名FB−3SDX 平均粒径3μm)
(2)導電性粒子:
球状銅粉(Ormet社製 商品名F2020 平均粒径3μm)と球状半田粉(三井金属鉱業社製 商品名ST−3 平均粒径3μm)の混合物
(3)ビスマレイミド樹脂:
下記化4を満たす構造(n=1〜20)、ゲル状。
ジメチルジフェニルブタノン(日本油脂製 商品名ノフマーBC−90 10時間半減温度210℃)
(5)カップリング剤:
メタクリロキシシラン(信越シリコーン社製 商品名KBM−503 化学名3−メタクリロキシプロピルトリメトキシシラン)
アクリロキシシラン(信越シリコーン社製 商品名KBM−5103 化学名3−アクリロキシプロピルトリメトキシシラン)
エポキシシラン(信越シリコーン社製 商品名KBM−403 化学名3−グリシドキシプロピルトリメトキシシラン)
アミノシラン(信越シリコーン社製 商品名KBM−573 化学名n−フェニル−3−アミノプロピルトリメトキシシラン)
以下の方法によって製造されたダイシングテープ。
<粘着フィルムの製造方法>
(粘着剤層組成物)
アクリル酸2−エチルヘキシル77質量部、2−ヒドロキシプロピルアクリレート23質量部を重合させ、重量平均分子量80万のアクリル共重合体に硬化剤としてポリイソシアネート3重量部を加えて混合し、粘着剤層組成物とした。
(ダイシングテープ)
作製した粘着剤層組成物を乾燥膜厚が10μmとなるように離型フィルムをなすPETフィルムに塗布し、120℃で3分間乾燥した。このPETフィルムに塗工した粘着剤層組成物を、支持基材である厚さ100μmのポリプロピレン−エラストマー(PP:HSBR=80:20のエラストマー)樹脂フィルム上に転写させることでDCテープを作製した。
なお、ポリプロピレン(PP)は、日本ポリケム株式会社製のノバテックFG4(商品名)を用い、水添スチレンブタジエン(HSBR)はJSR株式会社製のダイナロン1320P(商品名)を用いた。また、PETフィルムはシリコーン離型処理されたPETフィルム
(帝人:ビューレックスS−314(商品名)、厚み25μm)を用いた。
また、接着フィルムの機能発現のために充填剤含有率を大幅に高めた実施例4においても、アクリロシキシラン系カップリング剤の適量添加により、実施例2と同様の顕著な効果が確認された。
103 …… 粘着剤層
105 …… 接着フィルム(熱硬化型接着フィルム)
1 …… 半導体ウェハ
2 …… 接着剤層
3 …… ダイシングテープ
4 …… 半導体チップ
5 …… 接着剤層付き半導体チップ
6 …… 配線基板
7 …… ボンディングワイヤー
8 …… 封止樹脂
9 …… 半導体パッケージ
10 …… ダイシング付き接着フィルム
11 …… ダイシングフィルム
201 …… スライド板
203 …… 上部チャック
Claims (4)
- (A)ビスマレイミド樹脂、(B)ラジカル開始剤、および(C)(メタ)アクリル基を有するシランカップリング剤を含み、前記ラジカル開始剤は、1時間半減期温度が140℃以上であることを特徴とする接着フィルム。
- 接着フィルム中の(A)ビスマレイミド樹脂の含有量が1〜50質量%であり、前記(B)ラジカル開始剤の含有量が0.1〜5質量%であり、前記(C)メタクリル基または、/及び、アクリル基を有するシランカップリング剤の含有量が0.1〜5質量%であることを特徴とする請求項1記載の接着フィルム。
- 請求項1または2に記載の接着フィルムを、ダイシングテープに積層してなることを特徴とする、ダイシングテープ付き接着フィルム。
- 請求項3に記載のダイシングテープ付き接着フィルムを用いてなる半導体パッケージ。
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