JP2013098266A - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
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Abstract
【解決手段】半導体ペレットと、前記半導体ペレット1の一方の面に接合される絶縁シート7と、前記半導体ペレットの他方の面と接合される金属板13と、を備える半導体装置300であって、前記絶縁シートは、前記半導体ペレットにおける外周部よりも突出しており、前記半導体素子の他方の面と、前記金属板とは焼結銀層17を介して接続され、当該焼結銀層は、前記半導体ペレットの他方の面及び側面部を覆って接合されていることを特徴とする。
【選択図】図2
Description
図1は、第一の実施形態にかかる半導体素子200の平面及び断面構造を示すものである。
図4は、本発明にかかる第二の実施形態によるダイオードパッケージ400の断面構造を示したものである。なお、第一の実施形態で使用しているものと同じものには、第一の実施形態と同じ図面番号を用いている。
図5は、本発明にかかる第三の実施形態によるダイオードパッケージ500の断面構造を示したものである。なお、第一の実施形態で使用しているものと同じものには、第一の実施形態と同じ図面番号を用いている。
図6(a)及び(b)は、本発明にかかる半導体ペレット201の平面及び断面構造を示したものである。図6(a)において、半導体基板21の上部にはトランジスター素子が形成されており、SiO2の絶縁膜25とポリイミドのパッシベーション膜28によって遮断された主電極と制御電極の2つの電極が形成されている。主電極は素子とオーミックコンタクトを取るためのAl電極膜23と、その上に形成された焼結Agの接合性を良くするNi/Au電極膜26から成り、制御電極も同様にAl電極膜24とNi/Au電極膜27から成る。半導体ペレットの上面には、主電極及び制御電極のサイズより小さい開口部48、49を有し、外形がペレットサイズより大きく加工されたポリイミドやポリアミドイミドの絶縁シート29がアクリル系またはシリコーン系の粘着剤30によって接着されている。
図8(a)及び(b)は、上述した実施形態で説明した半導体素子を実装した半導体装置の一実施形態を示す。図8(a)及び(b)において、トランジスター基板51には裏面電極52と主電極54と制御電極53が形成され、半導体基板51における主電極54が形成された面側には、主電極54と制御電極53を囲うように絶縁層55が形成され、トランジスターペレット301が構成されている。また、主電極側の半導体基板面には、主電極53及び制御電極54部にそれらサイズより小さい開口部が形成され、外形の少なくとも辺の領域が半導体基板サイズより大きい絶縁性のポリイミドからなる絶縁シート56が接着されている。また、ダイオード基板57には全面に金属膜が形成された裏面電極58と周囲に絶縁領域60を形成したパターン電極59が形成されてダイオードペレット401が構成されており、パターン電極59側の半導体基板面にはパターン電極59のサイズより小さい開口部を有し、外形の少なくとも辺の領域が半導体基板サイズより大きい絶縁性のポリイミドからなる絶縁シート61が接着されている。セラミック基板62の裏面にはセラミック基板サイズより一回り小さいCuパターン66が形成され、上面には制御電極用と主電極用とベース電極用の3つのCuパターン63、64、65が形成され、セラミック配線基板が構成されている。セラミック配線基板の各Cuパターン表面には、無電解Ni/フラッシュAuめっきが施されている。ベース電極用Cuパターン63、64、65にはトランジスターペレット301とダイオードペレット401がポーラス構造を有する焼結Ag71、73で金属接合され、ペレット側面の焼結Agペーストの這い上がりはポリイミドからなる絶縁シート56、61で各ペレット上面の高さ以下となるように抑えられている。
図9は、実施形態1に記載した半導体素子を、ゲルを用いて封止した半導体装置の一実施形態を示す。図9において、熱膨張率を10ppm以下に下げた放熱板94と、内部にNiめっきCuリード96、97を埋設した熱可塑性樹脂の筐体95が接着されてモジュールケースが構成されている。セラミック絶縁基板84の上下に形成されたCuパターン85、86、87から成るセラミック配線基板は、Cuパターン87を下側として、放熱板94にSn、Ag、Cuを主要構成元素とする鉛フリーはんだ81で接合されている。セラミック配線基板のベース電極用Cuパターン85には、ポリアミドイミドから成る絶縁シート83が接着された半導体ペレット81が空孔率20〜40vol%のポーラスな焼結Ag89でダイボンディングされ、半導体ペレット81の上側の主電極82と金属リード88及び金属リード88と主電極用Cuパターン86が焼結Ag90、92で金属的に接合されている。主電極用Cuパターン86とNiめっきCuリード97はCuボンディングワイヤ99で接続され、ベース電極用Cuパターン85とNiめっきCuリード96はCuボンディングワイヤ98で接続されている。焼結Agで接合した領域は、熱硬化性のエポキシ樹脂91、93で部分的にポッティングで封止し、モジュールケース内全体を覆うようにシリコーンゲル100で覆っている。最終的にはモジュールケースの上部に樹脂製の蓋を被せて、モジュールが完成する。
図10は、本実施形態による半導体装置の他の実施例を示す。図10において、Cuのベース電極部材126とリード電極部材128には、全面に約3μm厚のAgめっきを施している。ベース電極部材128の台座127は逆台形に加工されており、リード電極部材128先端の接合用ヘッド129は、有機絶縁シート125の開口部の中に納まるサイズに加工されている。ダイオードチップ121の下面に形成された裏面電極122は、下側のポーラスな焼結Ag130を介してベース電極部材126の台座に金属接合されている。ポーラスな焼結Ag130は、ダイオードペレット124の側面を這い上がって有機絶縁シート125まで達しているが、有機絶縁シート125によって、ダイオードペレット124の上面電極への焼結Agの回り込みが抑えられている。そのため、半導体装置作成時における上下電極の短絡を、確実に防止することが可能となる。ダイオードペレット124の上面のパターン電極123は上側のポーラスな焼結Ag132によってリード電極部材128と金属接合されている。焼結Ag132は、有機絶縁シート125の開口部からはみ出して有機絶縁シート125上に拡がっているが、シート面内から漏れ出すことは無い。
図11は、本発明による半導体装置の他の実施例を示す。なお、本実施形態の説明において、第七の実施形態と同じ構成については同様の図面番号を用いている。
7 有機絶縁シート
13 ベース電極部材
14 台座
15 リード電極部材
16 接合用ヘッド
17、18 焼結Ag
19 有機皮膜
20 エポキシ樹脂
300 ダイオードパッケージ
Claims (10)
- 半導体ペレットと、
前記半導体ペレットの一方の面に接着される絶縁シートと、
前記半導体ペレットの他方の面と接合される金属板と、を備える半導体装置であって、
前記絶縁シートは、前記半導体ペレットにおける外周部よりも突出しており、かつ、前記半導体ペレットにおける電極面が露出するように形成され、
前記半導体ペレットの他方の面と、前記金属板とは焼結銀層を介して接続され、
当該焼結銀層は、前記半導体素子の他方の面及び側面部を覆っていることを特徴とする半導体装置。 - 請求項1に記載の半導体装置において、
前記半導体ペレット、前記絶縁シート、及び前記焼結銀層は、有機皮膜に覆われていることを特徴とする半導体装置。 - 請求項1または2に記載の半導体装置において、
前記金属板は、前記半導体ペレットを搭載する台座部を有し、
前記台座部は、前記半導体ペレットを搭載する上面部を有し、
前記上面部の面積は、前記台座部を前記上面部と平行に切断した面の面積よりも大きくなるように構成され、
前記半導体ペレット、前記絶縁シート、前記焼結銀層、及び前記台座部は樹脂で覆われていることを特徴とする半導体装置。 - 請求項3に記載の半導体装置において、
前記電極面は、焼結銀を介してリード電極と接続され、
当該リード電極の一部は、前記有機皮膜で覆われた有機皮膜被覆部を有し、かつ当該有機皮膜被覆部を介して前記樹脂に覆われていることを特徴とする半導体装置。 - 請求項1乃至4のいずれかに記載の半導体装置において、
前記焼結銀層は、導電性粒子を含有することを特徴とする半導体装置。 - 請求項1乃至4のいずれかに記載の半導体装置において、
前記焼結銀層は、応力緩衝板を含有することを特徴とする半導体装置。 - 半導体ペレットと、
前記半導体ペレットにおける外周部よりも突出した絶縁シートと、
前記半導体ペレットを搭載する金属板と、を有する半導体装置の製造方法において、
前記半導体ペレットと前記絶縁シートとを接着する第一の工程と、
前記金属板に焼結銀ペーストを塗布する第二の工程と、
前記第一及び第二の工程の後に、加圧して、前記半導体ペレットを前記金属板に搭載する第三の工程を有することを特徴とする半導体装置の製造方法。 - 請求項7に記載の半導体装置の製造方法において、
前記金属板は、前記半導体ペレットを搭載する台座部を有し、
前記台座部は、前記半導体ペレットを搭載する上面部を有し、
前記上面部の面積は、前記台座部を前記上面部と平行に切断した面の面積よりも大きくなるように構成されていることを特徴とする半導体装置の製造方法。 - 請求項7または8に記載の半導体装置の製造方法において、
前記第三の工程の後に、液状樹脂を塗布し、当該液状樹脂を50〜90%の硬化状態として有機皮膜を作製する第四の工程を有することを特徴とする半導体装置の製造方法。 - 請求項9に記載の半導体装置の製造方法において、
前記第四の工程の後に、前記有機皮膜を覆う封止樹脂でトランスファーモールドする第五の工程を有することを特徴とする半導体装置の製造方法。
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