JP2010171402A - 熱硬化型ダイボンドフィルム - Google Patents
熱硬化型ダイボンドフィルム Download PDFInfo
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- JP2010171402A JP2010171402A JP2009288001A JP2009288001A JP2010171402A JP 2010171402 A JP2010171402 A JP 2010171402A JP 2009288001 A JP2009288001 A JP 2009288001A JP 2009288001 A JP2009288001 A JP 2009288001A JP 2010171402 A JP2010171402 A JP 2010171402A
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Abstract
【解決手段】熱硬化型ダイボンドフィルム3は、半導体装置の製造の際に用いる熱硬化型ダイボンドフィルム3であって、エポキシ樹脂、フェノール樹脂、アクリル共重合体及びフィラーを少なくとも含み、80℃〜140℃における熱硬化前の貯蔵弾性率が10kPa〜10MPaの範囲内であり、175℃における熱硬化前の貯蔵弾性率が0.1MPa〜3MPaの範囲内である。
【選択図】図1
Description
即ち、本発明によれば、80℃〜140℃における貯蔵弾性率を10kPa〜10MPaの範囲内とし、175℃における貯蔵弾性率を0.1MPa〜3MPaの範囲内とするので、BT基板やリードフレーム等の被着体に対し良好な濡れ性及び接着性を発揮することができる。その結果、例えば、本発明の熱硬化型ダイボンドフィルムを介して半導体チップを被着体にダイボンドする場合や、ダイボンド後の半導体チップに対しワイヤーボンディングをする場合、更に被着体にダイボンドされた半導体チップを樹脂封止する場合にも、半導体チップを被着体に接着固定させ続けることができる。即ち、本発明の構成であると、歩留まりを向上させて半導体装置を製造することが可能な熱硬化型ダイボンドフィルムを提供することができる。
次に、本実施の形態に係るダイシング・ダイボンドフィルム10を用いた半導体装置の製造方法について、以下に説明する。
前記被着体上に半導体素子を3次元実装する場合、半導体素子の回路が形成される面側には、バッファーコート膜が形成されている。当該バッファーコート膜としては、例えば窒化珪素膜やポリイミド樹脂等の耐熱樹脂からなるものが挙げられる。
アクリル酸エチル−メチルメタクリレートを主成分とするアクリル共重合体としてのアクリル酸エステル系ポリマー(ナガセケムテックス(株)製、テイサンレジン SG−708−6、重量平均分子量80万)100部に対して、エポキシ樹脂(JER(株)製、エピコート834、重量平均分子量470)6.25部、フェノール樹脂(荒川化学(株)製、タマノル100S、重量平均分子量900)12.5部、平均粒径500nmの球状シリカ(アドマテックス(株)製、SO−25R)54部をメチルエチルケトンに溶解させ、濃度20.7重量%の接着剤組成物を調製した。
アクリル酸エチル−メチルメタクリレートを主成分とするアクリル共重合体としてのアクリル酸エステル系ポリマー(ナガセケムテックス(株)製、テイサンレジン SG−708−6、重量平均分子量80万)100部に対して、エポキシ樹脂(JER(株)製、エピコート834、重量平均分子量470)12.5部、フェノール樹脂(荒川化学(株)製、タマノル100S、重量平均分子量900)12.5部、平均粒径500nmの球状シリカ(アドマテックス(株)製、SO−25R)83部をメチルエチルケトンに溶解させ、濃度21.5重量%の接着剤組成物を調製した。
アクリル酸エチル−メチルメタクリレートを主成分とするアクリル共重合体としてのアクリル酸エステル系ポリマー(ナガセケムテックス(株)製、テイサンレジン SG−708−6、重量平均分子量80万)100部に対して、エポキシ樹脂(JER(株)製、エピコート834、重量平均分子量470)7部、フェノール樹脂(荒川化学(株)製、タマノル100S、重量平均分子量900)7部、平均粒径500nmの球状シリカ(アドマテックス(株)製、SO−25R)85部をメチルエチルケトンに溶解させ、濃度20.5重量%の接着剤組成物を調製した。
アクリル酸エチル−メチルメタクリレートを主成分とするアクリル共重合体としてのアクリル酸エステル系ポリマー(ナガセケムテックス(株)製、テイサンレジン SG−708−6、重量平均分子量40万)100部に対して、エポキシ樹脂(JER(株)製、エピコート834、重量平均分子量470)85部、フェノール樹脂(荒川化学(株)製、タマノル100S、重量平均分子量900)47部、平均粒径500nmの球状シリカ(アドマテックス(株)製、SO−25R)232部をメチルエチルケトンに溶解させ、濃度21.0重量%の接着剤組成物を調製した。
アクリル酸エチル−メチルメタクリレートを主成分とするアクリル共重合体としてのアクリル酸エステル系ポリマー(ナガセケムテックス(株)製、テイサンレジン SG−708−6、重量平均分子量40万)100部に対して、エポキシ樹脂(JER(株)製、エピコート834、重量平均分子量470)43部、フェノール樹脂(荒川化学(株)製、タマノル100S、重量平均分子量900)23部、平均粒径500nmの球状シリカ(アドマテックス(株)製、SO−25R)588部をメチルエチルケトンに溶解させ、濃度21.0重量%の接着剤組成物を調製した。
本比較例1においては、球状シリカの含有量を1125部に変更したこと以外は、実施例1と同様にして本比較例1に係る熱硬化型ダイボンドフィルムDを作製した。
アクリル酸エチル−メチルメタクリレートを主成分とするアクリル共重合体としてのアクリル酸エステル系ポリマー(根上工業(株)製、パラクロンW−197CM、重量平均分子量40万)100部に対して、エポキシ樹脂1(JER(株)製、エピコート1004、重量平均分子量1400)250部、エポキシ樹脂2(JER(株)製、エピコート827、重量平均分子量370)250部、フェノール樹脂(三井化学(株)製、レミックスXLC−4L、重量平均分子量1385)500部、平均粒径500nmの球状シリカ(アドマテックス(株)製、SO−25R)667部をメチルエチルケトンに溶解させ、濃度21.4重量%の接着剤組成物を調製した。
アクリル酸エチル−メチルメタクリレートを主成分とするアクリル共重合体としてのアクリル酸エステル系ポリマー(ナガセケムテックス(株)製、テイサンレジン SG−708−6、重量平均分子量40万)100部に対して、エポキシ樹脂(JER(株)製、エピコート834、重量平均分子量470)3.3部、フェノール樹脂(荒川化学(株)製、タマノル100S、重量平均分子量900)1.9部、平均粒径500nmの球状シリカ(アドマテックス(株)製、SO−25R)45部をメチルエチルケトンに溶解させ、濃度20.9重量%の接着剤組成物を調製した。
アクリル酸エチル−メチルメタクリレートを主成分とするアクリル共重合体としてのアクリル酸エステル系ポリマー(ナガセケムテックス(株)製、テイサンレジン SG−708−6、重量平均分子量40万)100部に対して、エポキシ樹脂(JER(株)製、エピコート828、重量平均分子量370)300部、フェノール樹脂(明和化成(株)製、MEH−7500−3S、重量平均分子量500)165部、平均粒径500nmの球状シリカ(アドマテックス(株)製、SO−25R)253部をメチルエチルケトンに溶解させ、濃度20.9重量%の接着剤組成物を調製した。
アクリル共重合体の重量平均分子量は、ゲルパーミエーションクロマトグラフィーによるポリスチレン換算の値である。ゲルパーミエーションクロマトグラフィーは、TSK G2000H HR、G3000H HR、G4000H HR、及びGMH−H HRの4本のカラム(いずれも東ソ株式会社製)を直列に接続して使用し、溶雛液にテトラヒドロフランを用いて、流速1ml/分、温度40℃、サンプル濃度0.1重量%テトラヒドロフラン溶液、サンプル注入量500μlの条件で行い、検出器には示差屈折計を用いた。
各実施例及び比較例の熱硬化型ダイボンドフィルムから、厚さ200μm、長さ25mm(測定長さ)、幅10mmの短冊状にカッターナイフで切り出し、固体粘弾性測定装置(RSAIII、レオメトリックサイエンティフィック(株)製)を用いて、−50〜300℃における貯蔵弾性率を測定した。測定条件は、周波数1Hz、昇温速度10℃/minとした。80℃、140℃、175℃における貯蔵弾性率E1’、E2’、E3’の値を下記表1に示す。
各実施例及び比較例に係る熱硬化型ダイボンドフィルムのガラス転移点は、先ず、前記貯蔵弾性率の場合と同様にして貯蔵弾性率を測定した。更に、損失弾性率も測定した後、tanδ(G”(損失弾性率)/G’(貯蔵弾性率))の値を算出することにより、ガラス転移温度を求めた。結果を下記表1に示す。
前記実施例及び比較例に於いて作製した熱硬化型ダイボンドフィルムについて、半導体素子に対する剪断接着力を以下の通り測定した。
前記実施例及び比較例に於いて作製した熱硬化型ダイボンドフィルムについて、半導体素子に対する剪断接着力を以下の通り測定した。
前記実施例及び比較例に於いて作製した熱硬化型ダイボンドフィルムを用い、BGA基板上にダイボンドしたミラーチップにワイヤーボンディングをした場合のワイヤーボンディング性を評価した。
前記剪断接着力の測定の場合と同様にして、BGA基板上に、各実施例及び比較例に係る熱硬化型ダイボンドフィルムを介して半導体チップ(縦10mm×横10mm×厚さ0.5mm)をダイアタッチした。次に、モールドマシン(TOWAプレス社製、マニュアルプレスY−1)を用いて、成形温度175℃、クランプ圧力184kN、トランスファー圧力5kN、時間120秒、封止樹脂GE−100(日東電工(株)製)の条件下で封止工程を行った。
下記表1の結果から分かる通り、実施例1〜5の熱硬化型ダイボンドフィルムであると、ダイボンド後の半導体チップが搬送中にBGA基板から脱落することがない。また、ワイヤーボンディング工程の際にも、BGA基板に対してずり変形による位置ズレやチップ割れが生じず、その結果、ワイヤーボンディング工程の際にも歩留まりの向上が図れる。更に、封止樹脂による封止の際にも半導体チップが当該封止樹脂により押し流されることがなかった。これにより、本実施例に係る熱硬化型ダイボンドフィルムが半導体装置の製造に必要な貯蔵弾性率と高い接着力を併せ持つことが確認された。
2 粘着剤層
3、3’、13、21 熱硬化型ダイボンドフィルム
4 半導体ウェハ
5 半導体チップ
6 被着体
7 ボンディングワイヤー
8 封止樹脂
9 スペーサ
10、11 ダイシング・ダイボンドフィルム
15 半導体チップ
16 ウェハリング
Claims (10)
- 半導体装置の製造の際に用いる熱硬化型ダイボンドフィルムであって、
エポキシ樹脂、フェノール樹脂、アクリル共重合体及びフィラーを少なくとも含み、80℃〜140℃における熱硬化前の貯蔵弾性率が10kPa〜10MPaの範囲内であり、175℃における熱硬化前の貯蔵弾性率が0.1MPa〜3MPaの範囲内である熱硬化型ダイボンドフィルム。 - 前記エポキシ樹脂とフェノール樹脂の合計重量をX重量部とし、アクリル共重合体の重量をY重量部としたときの比率X/Yが、0.11〜4である請求項1に記載の熱硬化型ダイボンドフィルム。
- 前記エポキシ樹脂、フェノール樹脂及びアクリル共重合体の合計重量をA重量部とし、フィラーの重量をB重量部としたときのB/(A+B)が、0.8以下である請求項1又は2に記載の熱硬化型ダイボンドフィルム。
- 前記エポキシ樹脂が芳香族環を有するエポキシ樹脂であり、前記フェノール樹脂がフェノールノボラック樹脂、フェノールビフェニル樹脂又はフェノールアラルキル樹脂の少なくとも何れかであり、前記アクリル共重合体がカルボキシル基含有アクリル共重合体又はエポキシ基含有アクリル共重合体の少なくとも何れかである請求項1〜3の何れか1項に記載の熱硬化型ダイボンドフィルム。
- 前記フィラーの平均粒径が0.005μm〜10μmの範囲内である請求項1〜4の何れか1項に記載の熱硬化型ダイボンドフィルム。
- 前記エポキシ樹脂の重量平均分子量が300〜1500の範囲内である請求項1〜5の何れか1項に記載の熱硬化型ダイボンドフィルム。
- 前記フェノール樹脂の重量平均分子量が300〜1500の範囲内である請求項1〜6の何れか1項に記載の熱硬化型ダイボンドフィルム。
- 前記アクリル共重合体の重量平均分子量が10万〜100万の範囲内である請求項1〜7の何れか1項に記載の熱硬化型ダイボンドフィルム。
- ガラス転移温度が10℃〜50℃以下の範囲内である請求項1〜8の何れか1項に記載の熱硬化型ダイボンドフィルム。
- 請求項1〜9の何れか1項に記載の熱硬化型ダイボンドフィルムが、ダイシングフィルム上に積層された構造であるダイシング・ダイボンドフィルム。
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