JP7165865B2 - 封止用材料、積層シート、硬化物、半導体装置、及び半導体装置の製造方法 - Google Patents
封止用材料、積層シート、硬化物、半導体装置、及び半導体装置の製造方法 Download PDFInfo
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- JP7165865B2 JP7165865B2 JP2019029918A JP2019029918A JP7165865B2 JP 7165865 B2 JP7165865 B2 JP 7165865B2 JP 2019029918 A JP2019029918 A JP 2019029918A JP 2019029918 A JP2019029918 A JP 2019029918A JP 7165865 B2 JP7165865 B2 JP 7165865B2
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- acrylic compound
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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Description
まず、本発明を完成するに至った経緯について説明する。
次に、本実施形態の封止用材料4について、詳細に説明する。なお、本明細書において、「(メタ)アクリ-」とは「アクリ-」と「メタクリ-」の総称である。例えば(メタ)アクリロイル基とは、アクリロイル基とメタクリロイル基の総称である。
重量減少率(%)=[(加熱前の重量)-(加熱後の重量)]/(加熱前の重量)×100。
える。なお、バンプ電極31ではなく基材2における導体配線21がはんだバンプ32を備えてもよく、バンプ電極31と導体配線21の各々がはんだバンプ32を備えてもよい。すなわち、半導体ウエハにおけるバンプ電極31と基材2における導体配線21とのうち、少なくとも一方が、はんだバンプ32を備えればよい。はんだバンプ32は、好ましくはSn-3.5Ag(融点221℃)、Sn-2.5Ag-0.5Cu-1Bi(融
点214℃)、Sn-0.7Cu(融点227℃)、Sn-3Ag-0.5Cu(融点217℃)などの、融点210℃以上の鉛フリーはんだ製である。
封止用材料を作製するための液状組成物を、次のように調製した。
・アクリル化合物1:エトキシ化ビスフェノールAジメタクリレート、新中村化学工業社製、品番BPE-80N(式(III)において、R3は水素原子、R4はジメチルメチレン基、m+n=2.3である)、重量減少率0.44%。
・アクリル化合物2:エトキシ化ビスフェノールAジメタクリレート、新中村化学工業社製、品番BPE-100N(式(III)において、R3は水素原子、R4はジメチルメチレン基、m+n=2.6である)、重量減少率0.22%。
・アクリル化合物3:エトキシ化ビスフェノールAジメタクリレート、新中村化学工業社製、品番BPE-200N(式(III)において、R3は水素原子、R4はジメチルメチレン基、m+n=4である)、重量減少率0.14%。
・アクリル化合物4:エトキシ化ビスフェノールAジメタクリレート、新中村化学工業社製、品番BPE-500N(式(III)において、R3は水素原子、R4はジメチルメチレン基、m+n=10である)、重量減少率0.25%。
・アクリル化合物5:エトキシ化ビスフェノールAジメタクリレート、新中村化学工業社製、品番BPE-1300N(式(III)において、R3は水素原子、R4はジメチルメチレン基、m+n=30である)、重量減少率0.30%。
・アクリル化合物6:ビスフェノールA型エポキシアクリレート、昭和高分子社製、品番VR-77、重量減少率0.51%。
・アクリル化合物7:トリシクロデカンジメタノールジアクリレート、新中村化学工業社製、品番A-DCP、重量減少率1.59%。
・アクリル化合物8:トリメチロールプロパントリアクリレート、新中村化学工業社製、品番A-TMPT、重量減少率2.00%。
・ポリフェニレンエーテル樹脂:上記式(3)に示す構造を有し、式(3)中のXが上記式(1)に示す構造を有する基(Rはメチル基)である、変性ポリフェニレンエーテル樹脂、SABIC社製、品番SA9000、重量減少率0.36%。
・熱ラジカル重合開始剤:ジクミルパーオキサイド、日油株式会社製、品名パークミルD。
・無機充填材1(フィラー):シリカ粉、株式会社トクヤマ製、品番NHM-24D、平均粒径0.24μm。
・無機充填材2(フィラー):シリカ粒子、株式会社アドマテックス製、品番SO-C2、平均粒径0.5μm。
・変性ポリブタジエン:マレイン酸変性ポリブタジエン、クレイバレー社製、品名Ricobond1756。
・熱可塑性樹脂:メチルメタクリレート,n-ブチルメタクリレート共重合体、エボニック社製、品名DYNACOLL AC2740。
・シランカップリング剤:3-グリシドキシプロピルトリメトキシシラン、信越化学工業株式会社製、品番KBM-403。
・フラックス:セバシン酸。
封止用材料に対し、次の評価試験を行った。これらの評価試験の結果は、表1に示す。
(1-1)サンプル(シート材の積層物)の作製
支持シートとしてポリエチレンテレフタレート製フィルムを用意した。この支持シートに、上記1.で調整した液状組成物を、バーコーターを用いて湿潤膜厚100μmになるように成膜し、130℃、15分間の条件で加熱した。これにより、支持シート上に厚み50μmの封止用材料(シート材)を作製した。複数枚のシート材を厚さ200μmとなるように積層して積層物を作製し、支持シートから積層物を剥離した。剥離した積層をカットすることで、平面視50mm×50mm、厚み200mmの寸法のサンプルを作製した。
まず、室温(約25℃)におけるサンプルの重量(乾燥前のシート重量という)を測定した。続いて、163℃に設定した乾燥機の中にサンプルを入れて、15分間乾燥させた。15分経過後、サンプルを乾燥機から取り出し、デシケータの中に入れて、30分間放冷した。30分経過後、デシケータからサンプルを取り出し、サンプルの重量(乾燥後のサンプル重量という)を測定した。
また、同様に130℃における重量減少率を測定した。表1に、各実施例及び比較例の163℃及び130℃における組成物の重量減少率の結果を示した。
各実施例及び比較例の封止用材料を、TAインスツルメンツ株式会社製のレオメータ(型番 AR2000ex)を用いて、温度範囲100~300℃、昇温速度60℃/min、角速度0.209rad/sの条件で、溶融粘度の温度依存性を測定した。これにより、封止用材料の温度と溶融粘度との関係を示す溶融粘度曲線を得た。この溶融粘度曲線から、最低溶融粘度を読み取るとともに、最低溶融粘度から50Pa・s上昇した溶融粘度における温度を読み取ることで、封止用材料の反応開始温度を得た。最低溶融粘度、反応開始温度、及び反応開始温度での溶融粘度の値を、表1の所定の欄に示した。
支持シートとしてポリエチレンテレフタレート製フィルムを用意した。この支持シートに上記1.で調整した液状樹脂組成物を、バーコーターを用いて湿潤膜厚100μmになるように成膜し、80℃、30分間の条件で加熱した。これにより、支持シート上に厚み50μmのシート材を作製した。複数枚のシート材を積層し、真空ラミネーターで圧縮成形し、オーブンで150℃、2時間の条件で加熱することで硬化させ、続いてカットすることで、平面視4mm×40mm、厚み800mmの寸法のサンプルを作製した。このサンプルのガラス転移温度を、セイコーインスツルメンツ株式会社製のTMA(熱機械分析)装置(型番SS7100)を用いて、引っ張り力49mN、温度プログラム30℃~300℃で5℃/minの条件で、測定した。
封止用材料を用い、次のようにして半導体装置を作製した。
封止用材料を用い、上記(3)ボイド評価の場合と同じ方法で試験用の半導体装置を作製した。この半導体装置の接続性を、次のように評価した。半導体装置を切断し、それにより生じた断面を研磨した。この断面に現れる、はんだバンプを介した、半導体チップにおけるCuピラーと基材の導体配線との間の寸法を測定した。その結果、この寸法が5μm未満であれば「A」、5μm以上10μm未満であれば「B」、10μm以上であれば「C」と評価した。
封止用材料を用い、上記(3)ボイド評価の場合と同じ方法で試験用の半導体装置を作製した。半導体装置における硬化物と半導体チップ及び基材との界面の剥離の有無を、超音波探傷装置(SAT)を用いて調査した。その結果、剥離が認められない場合を「A」、剥離が認められる場合を「C」と、評価した。
2 基材
21 導体配線
3 半導体チップ
31 バンプ電極
4 封止用材料
40 シート材
41 封止材
6 積層シート
Claims (12)
- 基材と前記基材に実装される半導体チップとの間の隙間を封止するための封止用材料であって、
前記封止用材料の反応開始温度は、160℃以下であり、
163℃の温度で加熱した場合に、前記封止用材料全量に対して、前記封止用材料から揮発する成分の合計量の割合が0.5質量%以下であり、
前記割合は、25℃における前記封止用材料の重量である乾燥前の重量と、163℃に設定した乾燥機の中に前記封止用材料を入れて、15分間乾燥させた後、前記封止用材料を前記乾燥機から取り出し、デシケータの中に入れて、30分間放冷した後、前記デシケータから取り出してから測定された前記封止用材料の乾燥後の重量とから、次式(1)により算出される、重量減少率である、
重量減少率(%)=[(乾燥前の重量)-(乾燥後の重量)]/(乾燥前の重量)×100 ・・・(1)
封止用材料。
- アクリル化合物(A)と、
ラジカル重合性を有する置換基(b1)を有するポリフェニレンエーテル樹脂(B)と、
熱ラジカル重合開始剤(C)と、
無機充填材(D)と、を含有する、
請求項1に記載の封止用材料。 - 最低溶融粘度は、300Pa・s以下である、
請求項1から3のいずれか一項に記載の封止用材料。 - 前記反応開始温度における溶融粘度は、350Pa・s以下である、
請求項1から4のいずれか一項に記載の封止用材料。 - シート状の形状を有する、
請求項1から5のいずれか一項に記載の封止用材料。 - 導体配線を備える基材の前記導体配線とバンプ電極を備える半導体チップの前記バンプ電極とを接触させ、前記導体配線と前記バンプ電極とを加熱しながら超音波振動を与えることで電気的に接続するにあたり、前記基材と前記半導体チップとの間の隙間を封止するために用いられる、
請求項1から6のいずれか一項に記載の封止用材料。 - 請求項6又は7に記載の封止用材料と、
前記封止用材料を支持する支持シートと、を備える、
積層シート。 - 請求項1から7のいずれか一項に記載の封止用材料を、熱硬化させて得られる、
硬化物。 - ガラス転移温度は、130℃以上である、
請求項9に記載の硬化物。 - 基材と、
前記基材にフェイスダウンで実装されている半導体チップと、
前記基材と前記半導体チップとの間の隙間を封止する封止材とを備え、
前記封止材が請求項9又は10に記載の硬化物からなる、
半導体装置。 - 導体配線を備える基材の前記導体配線がある面に、請求項1から7のいずれか一項に記載の封止用材料を介在させて、バンプ電極を備える半導体チップを前記導体配線と前記バンプ電極が対向するように配置し、
前記封止用材料を加熱しながら、超音波振動を与えることで、前記封止用材料を硬化させるとともに、前記導体配線と前記バンプ電極とを電気的に接続することを含む、
半導体装置の製造方法。
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