JP6480086B2 - 接合フィルムおよびウエハ加工用テープ - Google Patents
接合フィルムおよびウエハ加工用テープ Download PDFInfo
- Publication number
- JP6480086B2 JP6480086B2 JP2018518671A JP2018518671A JP6480086B2 JP 6480086 B2 JP6480086 B2 JP 6480086B2 JP 2018518671 A JP2018518671 A JP 2018518671A JP 2018518671 A JP2018518671 A JP 2018518671A JP 6480086 B2 JP6480086 B2 JP 6480086B2
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- Prior art keywords
- bonding
- layer
- fine particles
- film
- organic solvent
- Prior art date
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Description
接合フィルム13は、半導体ウエハ1が貼り合わされてダイシングされた後、個片化された半導体素子2をピックアップする際に、粘着フィルム12から剥離して半導体素子2に付着してピックアップされ、半導体素子2を基板40に固定する際の接合材として使用されるものである。従って、接合フィルム13は、ピックアップ工程において、個片化された半導体素子2に付着したままの状態で、粘着フィルム12から剥離することができる粘着性と剥離性を有し、さらに、半導体素子2と基板40とを接合して、十分な機械的強度と熱サイクル特性を有するものである。ピックアップ工程については図5を参照して後述する。
導電性接合層は、金属微粒子(P)を含む導電性ペーストを多孔質体または網目状態からなる強化層に含浸させて形成することにより、導電性ペーストが多孔質体の孔または網目状態の網目に充填されている。導電性ペーストは、金属微粒子(P)を含む他、有機分散媒(D)を含むことが好ましい。
。
タック層13bは、導電性接合層13aを半導体ウエハ1や半導体素子2に保持させるためのものであり、タック性を有している。なお、本発明においてタック性とは、接着性を意味し、具体的には、導電性接合層13aを半導体ウエハ1や半導体素子2に保持させることのできる接着性を意味する。また、タック層13bは、半導体素子2と基板40とを接合する際の加熱により熱分解される。タック層13bは、上記のような性質を有するものであれば、特に限定されるものではなくどのようなもので構成されていてもよい。
本発明においては、タック層13bが半導体素子2と基板40とを接合する際の加熱で熱分解されることにより、半導体素子2と基板40とが導電性接合層13aを介して機械的に接合されることが重要である。このため、タック層13bは、接合時の加熱温度で、空気雰囲気下、昇温速度5℃/分の熱重量測定における重量減少が70重量%以上であることが好ましく、さらに好ましくは85重量%以上、さらに好ましくは95重量%以上である。
粘着フィルム12は、半導体ウエハ1をダイシングする際には接合フィルム13に保持された半導体ウエハ1が剥離しないように十分な粘着力を有し、ダイシング後に個片化された半導体素子2をピックアップする際には容易に接合フィルム13から剥離できるような低い粘着力を有するものである。本実施形態において、粘着フィルム12は、図1に示すように、基材フィルム12aに粘着剤層12bを設けたものを例示したが、これに限定されるものではなく、ダイシングテープとして使用される公知の粘着フィルムを用いることができる。
半導体装置100(図6参照)の製造工程の中で、ウエハ加工用テープ10は、以下のように使用される。図2においては、ウエハ加工用テープ10に、半導体ウエハ1とリングフレーム20とが貼り合わされた様子が示されている。
まず、図2に示すように、粘着フィルム12の粘着剤層12bをリングフレーム20に貼り付け、半導体ウエハ1を接合フィルム13のタック層13bに貼り合わせる。これらの貼り付け順序に制限はなく、半導体ウエハ1を接合フィルム13に貼り合わせた後に粘着フィルム12の粘着剤層12bをリングフレーム20に貼り付けても良い。また、粘着フィルム12のリングフレーム20への貼り付けと、半導体ウエハ1の接合フィルム13への貼り合わせとを、同時に行っても良い。
水溶液中で銅イオンからの無電解還元により調製された、平均一次粒子径150nmの銅微粒子を70質量%と、有機溶剤としてグリセロール40体積%、N−メチルアセトアミド55体積%、及びトリエチルアミン5体積%からなる混合溶剤(有機溶剤(S1)に相当する)95質量%と有機バインダーとしてエチルセルロース(平均分子量1000,000)5質量%からなる有機分散媒30質量%とを混錬して、導電性ペースト(1)を調製した。
ポリグリセリン10質量%にメタノール90質量%を混合させ、ポリグリセリンを希釈して、タック層組成物(1)を調製した。
強化層(1):ステンレスメッシュ(アサダメッシュ株式会社製、品番「HS−D」、開口率39%、メッシュ厚45μm)
強化層(2):タングステンメッシュ(株式会社くればぁ製、品番「325」、開口率63.2%、メッシュ厚40μm)
強化層(3):ニッケルメッシュ(株式会社ハギテック製、型式「2552−9818−11」、開口率0.3%、メッシュ厚40μm)
強化層(4):モノフィラメント径6μmのPAN系炭素繊維束を開繊し、これを基材としてアクリル樹脂(東亜合成株式会社製、アロン(登録商標)A−104)を均一に含浸させ、厚さ50μmのシートを形成し、このシートを600℃程度で炭化処理して、炭素繊維を網目状に成形したシートを作製した。
強化層(5):銅メッシュ(MTIジャパン社製、品番「EQ−bccnf−45u」、開口率30%、メッシュ厚45μm)
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を用いた。また、塗工用フィルムはシリコーン離型処理されたPETフィルム(帝人:ヒューピレックスS−314、厚み25μm)を用いた。
載置台の上に、離型フィルム(50μmのポリエチレンテレフタレートフィルム)、その上に、350μm厚で中央部に6inchの円形の開口を有するSUS製のスペーサーを配置し、スペーサーの開口部から臨む離型フィルムの上に、強化層(1)を配置し、その上に上述の導電性ペースト(1)を5.0g載置し、スキージを用いてスクリーン印刷を行って導電性ペーストを圧延し、導電性ペーストを強化層を構成する多孔質体または網目状体の孔内に埋め込むようにして含浸させた。そして、スペーサーを除去した後、不活性雰囲気中で15分間予備乾燥を行い、導電性接合層とした。
強化層(1)に代えて強化層(2)を用いた以外は、実施例1と同様にして実施例2に係るウエハ加工用テープを得た。
強化層(1)に代えて強化層(3)を用いた以外は、実施例1と同様にして実施例3に係るウエハ加工用テープを得た。
強化層(1)に代えて強化層(4)を用いた以外は、実施例1と同様にして実施例4に係るウエハ加工用テープを得た。
導電性ペースト(1)に代えて導電性ペースト(2)を用い、強化層(1)に代えて強化層(5)を用いた以外は実施例1と同様にして実施例5に係るウエハ加工用テープを得た。
(比較例1)
強化層(1)、タック層組成物(1)を用いなかった以外は、実施例1と同様にして比較例1に係るウエハ加工用テープを得た。
強化層(1)に代えて強化層(5)を用い、タック層組成物(1)に代えてタック層組成物(2)を用いた以外は、実施例1と同様にして比較例2に係るウエハ加工用テープを得た。
強化層(1)に代えて強化層(5)を用いた以外は、実施例1と同様にして比較例3に係るウエハ加工用テープを得た。
半導体ウエハとして、厚み230μmの半導体ウエハの表面にTi/Au=100nm/200nmのチップ電極層を形成したものを準備し、基板として、厚みが1.2mmの調質が半硬質の無酸素銅板を準備した。上記実施例に係るウエハ加工用テープを80℃に熱したホットプレート上に載置して加熱してタック層の半導体ウエハの表面(チップ電極層側の面)への密着性を高めた状態でタック層に半導体ウエハの表面を貼り付け、その後室温に戻し、タック層を冷却硬化させた状態でダイシング装置(DISCO社製、DAD340(商品名))を用いて、接合フィルムとともに7mm×7mmの半導体チップにダイシングした。その後、高圧水銀灯ランプの紫外線照射機を用いて、粘着フィルムの基材フィルム面側から照射量が200mJ/cm2となるように紫外線照射を行った。そして、ダイボンダ―(キヤノンマシナリー株式会社製、CPS−6820(商品名))を用いて粘着フィルムをエキスパンドし、その状態で半導体チップを接合フィルムとともにピックアップし、接合フィルムの導電性接合層側を基板上に載置した。
上記と同様にして実装サンプル20個を作製し、実装サンプル10個ずつについて、−50℃で30分間と225℃で30分間を1サイクルとする冷熱衝撃試験、および−50℃で30分間と250℃で30分間を1サイクルとする冷熱衝撃試験を行った。50回ごとにサンプルを取り出し、割れ、剥離が無いか目視にて検査した。その後、その後、超音波顕微鏡(日立建機株式会社製、 Mi-Scope(商品名))とプローブ(型式「PQ2−13」、50MHz)を使用して、半導体チップ側から超音波を照射し、反射法で剥離の測定を行った。剥離面積が10%を超えたものを故障と判定した。故障と判定されるまでのTCT回数がすべての実装サンプルで100回以上のものを良品として○、100回未満のものがあったものを不良品として×で評価した。
上記と同様にして実装サンプル20個を作製し、実装サンプル10個について、半導体素子との接合面近傍で接合部分を切断し、その断面を研磨した後に電子顕微鏡で観察し、空隙面積率の平均値を求めた。空隙面積率は次のようにして算出した。
(空隙面積率)≡(空隙の面積)/((空隙の面積)+(空隙以外の面積))×100
断面組織中のボイド及び金属の面積は、市販の画像処理ソフトを用いて断面組織写真を二値化した後、それぞれの画素数から算出した。
10:ウエハ加工用テープ
11:離型フィルム
12:粘着フィルム
12a:基材フィルム
12b:粘着剤層
13:接合フィルム
13a:導電性接合層
13b:タック層
40:基板
Claims (10)
- 半導体素子と基板とを接合するための接合フィルムであって、
銅微粒子または銀微粒子を含む金属微粒子(P)を含む導電性ペーストが多孔質体または網目状体からなる強化層の孔または網目に充填された導電性接合層を有し、
前記強化層は、前記金属微粒子(P)よりも熱膨張係数が小さいことを特徴とする接合フィルム。 - タック性を有し、前記導電性接合層に積層されたタック層をさらに有する請求項1に記載の接合フィルム。
- 前記タック層は、前記金属微粒子(P)を還元させる物質を含み、接合時の加熱により、前記タック層が熱分解され、前記導電性接合層の前記金属微粒子(P)が焼結することによって、前記半導体素子と前記基板とが接合されることを特徴とする請求項2に記載の接合フィルム。
- 前記金属微粒子(P)は、平均一次粒径が10〜500nmであり、前記導電性ペーストは、有機溶剤(S)を含むことを特徴とする請求項1から請求項3のいずれか一項に記載の接合フィルム。
- 前記導電性ペーストは、有機バインダー(R)を含むことを特徴とする請求項4に記載の接合フィルム。
- 前記タック層は、ポリグリセリン、グリセリン脂肪酸エステル、グリセリン脂肪酸エステル、ポリグリセリン脂肪酸エステル、ホスフィン類、ホスファイト類、スルフィド類、ジスルフィド類、トリスルフィド類、およびスルホキシド類の中から選択される1種もしくは2種以上からなることを特徴とする請求項2または請求項3に記載の接合フィルム。
- 前記強化層は、炭素繊維を網目状に成形したシート、ステンレスメッシュ、タングステンメッシュ、およびニッケルメッシュの中から選択される1種もしくは2種以上からなることを特徴とすることを特徴とする請求項1から請求項6のいずれか一項に記載の接合フィルム。
- 前記有機溶剤(S)は、常圧における沸点が100℃以上でかつ分子中に1または2以上のヒドロキシル基を有するアルコールおよび/もしくは多価アルコールからなる有機溶剤(SC)を含むことを特徴とする請求項4または請求項5に記載の接合フィルム。
- 前記有機バインダー(R)は、セルロース樹脂系バインダー、アセテート樹脂系バインダー、アクリル樹脂系バインダー、ウレタン樹脂系バインダー、ポリビニルピロリドン樹脂系バインダー、ポリアミド樹脂系バインダー、ブチラール樹脂系バインダー、およびテルペン系バインダーの中から選択される1種または2種以上であることを特徴とする請求項5に記載の接合フィルム。
- 基材フィルムと該基材フィルム上に設けられた粘着剤層とを有する粘着フィルムと、
請求項1から請求項9のいずれか一項に記載の接合フィルムと
を有し、
前記粘着剤層上に、前記接合フィルムの導電性接合層が設けられていることを特徴とするウエハ加工用テープ。
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