JP5302175B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP5302175B2 JP5302175B2 JP2009282816A JP2009282816A JP5302175B2 JP 5302175 B2 JP5302175 B2 JP 5302175B2 JP 2009282816 A JP2009282816 A JP 2009282816A JP 2009282816 A JP2009282816 A JP 2009282816A JP 5302175 B2 JP5302175 B2 JP 5302175B2
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Description
本願において、実施の態様の記載は、必要に応じて、便宜上複数のセクション等に分けて記載するが、特にそうでない旨明示した場合を除き、これらは相互に独立別個のものではなく、記載の前後を問わず、単一の例の各部分、一方が他方の一部詳細または一部または全部の変形例等である。また、原則として、同様の部分は繰り返しの説明を省略する。また、実施の態様における各構成要素は、特にそうでない旨明示した場合、理論的にその数に限定される場合および文脈から明らかにそうでない場合を除き、必須のものではない。
図1は、本実施の形態の半導体装置を組み込んだ撮像システムの動作を模式的に示す説明図である。
次に、図1に示す半導体装置2の構成について、図1〜図3を用いて説明する。本実施の形態は、BGA(Ball Grid Array)型の半導体装置に適用したものであり、図2はこのBGAの上面側の内部構造を示す平面図、図3は図2のA−A線に沿った断面図である。
次に、本実施の形態における半導体装置2の製造工程について、説明する。本実施の形態における半導体装置2は、図4に示す組立てフローに沿って製造される。図4は図1〜図3に示す半導体装置の組み立てフローを示す説明図である。各工程の詳細については、図5〜図31を用いて、以下に説明する。
まず、図4に示す基材準備工程S1として、図5に示すような配線基板40を準備する。図5は図4に示す基材準備工程で準備する配線基板の全体構造を示す平面図、図6は図5のB部を拡大した拡大平面図である。また、図7は、図6のC部をさらに拡大した拡大平面図である。なお、図7は図6に示すチップ搭載領域20c周辺の拡大平面図であるが、チップ搭載領域20b周辺についても図7を用いて説明することができるので、チップ搭載領域20b周辺の拡大平面図は図示は省略する。
図4に示す半導体チップ準備工程S2として、図2に示す複数の半導体チップ12を準備する。本工程では、まず、図8〜図10に示すような半導体ウエハ50を準備する。図8は、図4に示す半導体チップ準備工程で半導体チップを取得するための半導体ウエハを示す平面図、図9は図8のD部を拡大した拡大平面図、図10は図9のE−E線に沿った拡大断面図である。また、図11は、第1のウエハダイシング方法における第1のステップを示す拡大断面図、図12は図11に示す第1のステップに続く第2のステップを示す拡大断面図である。また、図13は、第2のウエハダイシング方法における第1のステップを示す拡大断面図、図14は図13に示す第1のステップに続く第2のステップを示す拡大断面図である。
次に、図4に示すダイボンディング工程S3について説明する。図15は図4に示すダイボンディング工程の第1の接着材配置工程を示す拡大平面図、図16は図15のF−F線に沿った拡大断面図である。
次に、図4に示すワイヤボンディング工程S4について説明する。図22は図4に示すワイヤボンディング工程の突起電極形成工程を示す拡大断面図、図23は図22のH部をさらに拡大した拡大断面図である。また、図24は図4に示すワイヤボンディング工程を示す拡大断面図、図25は図24のH部をさらに拡大した拡大断面図である。
次に、図4に示す封止工程S5について説明する。図26は封止工程で用いる成形金型に配線基板を配置して上金型側から透視した状態を示す透視平面図である。図27は図26に示すJ−J線に沿った断面図である。また、図28は、図26に示すK部において、配線基板上に供給する封止用樹脂の流れ方向を拡大して示す拡大平面図である。また図29は、図27に示す封止用樹脂を硬化させた状態を示す拡大断面図である。
次に、図4に示すベーク工程S6について説明する。
次に、図4に示すボールマウント工程S7について説明する。図30は、配線基板に複数の半田ボールを接合した状態を示す拡大断面図である。なお、図30は、図15に示すF−F線に沿った断面に対応している。
次に、図4に示す個片化工程S8について説明する。図31は図30に示す配線基板および封止体を個片化する工程を示す拡大断面図である。
例えば、前記実施の形態では、複数のチップ搭載領域20aの周囲を取り囲む溝部26bを接続し、一体に形成する実施態様について説明した。このように溝部26bを一体に形成することにより、チップ搭載領域20aの間に配置される溝部26bを1本とすることができるので、半導体装置2の平面寸法の小型化の観点から前記実施の形態の態様が好ましい。
また例えば、前記実施の形態で説明したように、溝部26bはダイボンディング工程において、接着材ペースト11aが濡れ広がる方向を制御する機能を有している。このため、チップ搭載領域20aを取り囲む溝部26bは連続的に形成され、途中で分断されていないことが特に好ましい。
また例えば、前記実施の形態では、ダイボンディング工程において、接着材ペースト11aが濡れ広がる方向を制御するダム部として例えばエッチング法により絶縁膜26を取り除いた溝部26bを形成した。
また例えば、前記実施の形態では、半導体チップ準備工程において、半導体チップ12の主面12c側の周縁部に面取り加工を施した後の形状として階段状に面取りされた形状について説明した。
また例えば、前記実施の形態では、ワイヤボンディング工程において、端子22とパッド31の接続は、所謂、正ボンディング方式を適用する実施態様について説明した。
また例えば、前記実施の形態では、チップ−チップ間接続において第2ボンド側となる半導体チップ12(VDRチップ12b)の周縁部に、ステップダイシング方式で面取り加工を施し、導体パターン51を取り除くことで、金属屑57の発生を防ぎ、ワイヤの短絡を抑制することについて説明した。面取り加工後の形状については、図3に示すような段差部や、図36に示すテーパ形状について説明した。
2、4、91 半導体装置
3 画像処理LSI(半導体装置)
10 配線基板
11 接着材
11a 接着材ペースト
12 半導体チップ、
12a AFEチップ
12b VDRチップ
12c 主面
12d 裏面
12e 側面
13、13a、13b、13c ワイヤ(導電性部材)
14 封止体
14a 封止用樹脂
20 配線基板
20a、20b、20c チップ搭載領域
21 コア層
21a 上面(主面)
21b 下面(裏面)
22 端子(ボンディングリード)
23 配線パターン
23a、23b、23c 配線
24 ランド
25 ビア
26 絶縁膜
26a 開口部
26b 溝部(ダム部)
26c 領域(中間領域)
26d エッジ部
26e 壁部(ダム部)
27 絶縁膜
27a 開口部
28 半田材
31、31a、31b、31c、31d、31e パッド(電極パッド)
32 スタッドバンプ
33 ワイヤ
40 配線基板
40a デバイス領域
40b 枠体(枠部)
50 半導体ウエハ
50a デバイス領域
50b スクライブ領域
50c 基材層
50d 配線層
50e 絶縁膜
51 導体パターン
52、54、55、56、58 ダイシングブレード
53 ダイシングテープ
57 金属屑
60 保持治具
61 キャピラリ
71 成形金型
72 上金型
72a 下面
72b キャビティ
72c ゲート部
72d エアベント部
73 下金型
73a 上面
75、76 矢印
80 ダイシングブレード
81 樹脂フィルム
90 領域
ADC A/D変換回路
CDS ノイズ低減回路
HDR 水平ドライバ
PGA 増幅回路
TG タイミングジェネレータ
VDR 垂直ドライバ
W1、W2、W3、W4、W5、W6 幅
H1、H2 高さ
Claims (6)
- (a)上面、および前記上面とは反対側の下面を有する第1層と、前記第1層の前記上面に形成された複数のボンディングリードと、前記第1層の前記上面に形成され、前記複数のボンディングリードとそれぞれ電気的に接続された複数の第1配線と、前記複数のボンディングリードが露出し、かつ前記複数の配線が覆われるように、前記第1層の前記上面に形成された絶縁膜と、を有する配線基板を準備する工程;
(b)第1主面、前記第1主面上に形成された複数の第1電極パッド、および前記第1主面とは反対側の第1裏面を有する第1半導体チップと、第2主面、前記第2主面上に形成された複数の第2電極パッド、および前記第2主面とは反対側の第2裏面を有する第2半導体チップを、前記配線基板の前記絶縁膜上において、前記複数のボンディングリードで囲まれる第1および第2チップ搭載領域に、前記第1および第2裏面が前記第1層の前記上面と対向するように、ペースト状の接着材を介してそれぞれ配置する工程;
(c)前記(b)工程の後、前記接着材に熱を加え、前記接着材を硬化させる工程、
(d)前記(c)工程の後、前記複数のボンディングリードと前記複数の第1および第2電極パッドとを複数の第1導電性部材を介して、前記複数の第1電極パッドと前記複数の第2電極パッドとを複数の第2導電性部材を介して、それぞれ電気的に接続する工程;
を含み、
前記複数のボンディングリードは、平面視において、前記第1半導体チップを搭載する前記第1チップ搭載領域と、前記第2半導体チップを搭載する前記第2チップ搭載領域の間には形成されず、
前記絶縁膜には、ダム部が形成され、
前記ダム部は、平面視において、前記第1および第2チップ搭載領域を取り囲むように形成されており、
前記複数の第1配線は、前記ボンディングリードから前記第1または第2チップ搭載領域に向かって延在し、前記第1または第2チップ搭載領域と重なる領域において、前記絶縁膜に覆われており、
平面視において、前記第1チップ搭載領域を囲む前記ダム部と、前記第2チップ搭載領域を囲む前記ダム部は、前記第1チップ搭載領域と前記第2チップ搭載領域の間で一体に形成されており、
前記第1および第2チップ搭載領域と前記ダム部は離間して配置されており、
前記ダム部は前記絶縁膜に形成した溝部であって、前記第1および第2チップ搭載領域と前記ダム部の間の領域は、前記絶縁膜により覆われており、
前記絶縁膜のうちの前記第1および第2チップ搭載領域のそれぞれには、前記ダム部に繋がる溝が形成されていないことを特徴とする半導体装置の製造方法。 - 請求項1において、
前記ダム部は前記絶縁膜を取り除かれた溝部であって、
前記第1および第2チップ搭載領域を取り囲む前記ダム部の一部には、前記絶縁膜が取り除かれていない領域が存在することを特徴とする半導体装置の製造方法。 - 請求項1において、
前記配線基板は、前記第1層の前記下面に形成された複数のランドと、前記第1層の前記下面に形成され、前記複数のランドと電気的に接続された複数の第2配線と、前記上面から前記下面に向かって形成された孔と、前記孔の内部に形成され、前記第1配線と前記第2配線とを電気的に接続する第3配線とを有し、
前記絶縁膜が取り除かれていない領域には、前記孔が配置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1において、
前記第1および第2チップ搭載領域は、それぞれ長方形の平面形状を成し、前記第1チップ搭載領域の第1長辺と前記第2チップ搭載領域の第2長辺が互いに対向するように配置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1において、
前記(b)工程では、前記ペースト状の接着材を前記第1および第2チップ搭載領域のそれぞれの一方の短辺側からこれに対向する他方の短辺側に向かって配置することを特徴とする半導体装置の製造方法。 - 請求項1において、
前記ダム部は、エッチング法により前記絶縁膜に形成されたものであることを特徴とする半導体装置の製造方法。
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