JP5512292B2 - 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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- JP5512292B2 JP5512292B2 JP2010002957A JP2010002957A JP5512292B2 JP 5512292 B2 JP5512292 B2 JP 5512292B2 JP 2010002957 A JP2010002957 A JP 2010002957A JP 2010002957 A JP2010002957 A JP 2010002957A JP 5512292 B2 JP5512292 B2 JP 5512292B2
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Description
図1は本発明の実施の形態1の半導体装置の構造の一例を示す斜視図、図2は図1の裏面側の外部端子の配列の一例を示す斜視図、図3は図1に示す半導体装置の構造の一例を封止体を透過して示す平面図、図4は図3のA−A線に沿って切断した構造の一例を示す拡大断面図である。また、図5は図1に示す半導体装置に組み込まれる第1半導体チップと第1接着層の構造の一例を示す斜視図、図6は図1に示す半導体装置に組み込まれる第2半導体チップと第2接着層の構造の一例を示す斜視図、図7は図1に示す半導体装置に組み込まれる配線基板の構造の一例を示す平面図、図8は図7の配線基板の内部構造の一例を示す拡大部分断面図である。
本実施の形態のLGA1は、基材として配線基板3を使用している。そして、図3及び図4に示すように、配線基板3上に16枚の半導体チップを階段状(1段ごとにずらして)に積層している。言い換えると、下段側の半導体チップのボンディングパッド(電極パッド)が露出するように、上段側の半導体チップをこの下段側の半導体チップに対してずらして、積層している。また、図4に示すように、4枚の半導体チップを同じ向き、換言すれば、それぞれの半導体チップのボンディングパッドが配線基板3の同じ辺側に位置するようにそれぞれの半導体チップの向きを揃えて、階段状に積層した後、積層方向(積層時に半導体チップをずらす方向のことであり、以降これを積層方向と呼ぶ)を180度変えてから、別の4枚の半導体チップを階段状に搭載している。その際、それぞれのボンディングパッドが1〜4段目までとは異なった反対側に配置されるように階段状に5〜8段目までを積層する。
次にLGA1に搭載された16枚の半導体チップについて説明する。
次に、LGA1に使用される基材について説明する。本実施の形態では基材として、図7及び図8に示すような、配線基板3を用いている。
次に、本実施の形態1の半導体装置(LGA1)の製造方法について説明する。
まず、図9に示すように、平面形状が円形状から成り、かつ基準部分が形成された半導体ウエハ11を準備する。ここで、基準部分は、図9に示すような半導体ウエハ11におけるオリエンテーションフラット11d、または図12に示すようなノッチ11eであり、半導体ウエハ11のシリコンの結晶方向を表す基準である。本実施の形態で使用する半導体ウエハ11は、シリコンの結晶方向がこの基準部分を基準として、図12に示すXY方向にそれぞれ形成されている。
次に、図13に示すダイシング済みの半導体ウエハ11をバックグラインドによって所望の厚さに薄くする。
次に、バックグラインド済みのそれぞれの半導体ウエハ11のテープを貼り替え、図16に示すように、ウエハリング16の内側に、バックグラインド工程を施した半導体ウエハ11を配置する。
次に、取得した複数の半導体チップをこのダイシングテープ15からピックアップする前に、まず、図19および図20に示すようにレーザーダイサー17により接着層(DAF)の切断を行う。ここでは、先の半導体ウエハのダイシング工程により形成された隙間に沿ってレーザー17aを照射し、ダイシングテープ15にダメージを与えないように接着層(第1接着層8、第2接着層9)のみを切断する。これにより、各半導体チップ4、5の外形形状に倣って、接着層8、9が切断される。
次に、1段目から4段目までのワイヤボンディングを行う。なお、LGA1の組み立てで行われるワイヤボンディングは、全て逆ボンディング方式を用いている。
次に、図33及び図34に示すように、5段目から8段目までのダイボンディングを行う。なお、5段目から8段目までのダイボンディングでは、1段目から4段目までのダイボンディングとその積層方向を180度変えており、5段目で積層方向を折り返している。ただし、階段状に1段ごとにずらして半導体チップを積層することは1段目から4段目までと同じであり、その際、それぞれの段のボンディングパッドが1段目から4段目までとは異なった反対側に配置されるように積層する。
次に、図35に示すように5段目から8段目のワイヤボンディング(逆ボンディング)を行う。5段目から8段目のワイヤボンディングは、1段目から4段目のワイヤボンディングと各段のワイヤリングの向きが180°変わるだけであり、その他のワイヤボンディング方法については、1段目から4段目と全く同じである。
次に、図36に示すように、9段目から12段目のダイボンディングを行う。9段目から12段目のダイボンディングは、1段目から4段目のダイボンディングと全く同じである。9段目は厚さが厚い第1半導体チップ4を使用し、10段目から12段目は厚さが薄い第2半導体チップ5を使用する。
次に、図36に示す9段目から12段目のワイヤボンディングを行う。9段目から12段目のワイヤボンディングは、1段目から4段目のワイヤボンディング(逆ボンディング)と全く同じであるため、その説明は省略する。9段目から12段目のワイヤボンディングにおいても、1段目から4段目のワイヤボンディングと同様に、低ループ化を図った高信頼性のワイヤボンディングを実現することができる。
次に、図37に示すように13段目のダイボンディングを行う。13段目のダイボンディングは、積層の折り返しの1段目である5段目のダイボンディングと全く同じである。すなわち、厚さが厚い第3半導体チップ6と同じく厚さが厚い第1接着層8とを組み合わせて用いる。
次に、図39に示す13段目から16段目のワイヤボンディングを行う。13段目から16段目のワイヤボンディングは、5段目から8段目のワイヤボンディング(逆ボンディング)と全く同じであるため、その説明は省略する。13段目から16段目のワイヤボンディングにおいても、5段目から8段目のワイヤボンディングと同様に、低ループ化を図った高信頼性のワイヤボンディングを実現することができる。
次に、LGA1の組み立てにおけるワイヤボンディング工程後の樹脂モールディング工程と個片化工程について説明する。図40は図1に示す半導体装置の組み立ての樹脂モールディング後の構造の一例を示す平面図、図41は図40に示す樹脂モールディング後の構造の一例を示す断面図、図42は図1に示す半導体装置の組み立ての個片化時の構造の一例を示す平面図、図43は図42に示す個片化時の構造の一例を示す断面図である。
次に、図42及び図43に示すように、仮想線24によって切断して個片化を行う。切断は、例えば、ブレードダイシングによって一括封止体22と多数個取り基板20の両者を一緒に切断する。
次に、本実施の形態1の変形例について説明する。
図50は本発明の実施の形態2の半導体装置の構造の一例を封止体を透過して示す平面図、図51は図50のA−A線に沿って切断した構造の一例を示す断面図、図52は図50のB−B線に沿って切断した構造の一例を示す断面図、図53は本発明の実施の形態2の第1変形例の半導体装置の構造を示す拡大部分断面図である。
まず、図53は第1変形例を示すものであり、実施の形態1で説明した図12に示すダイシング方法によって取得した厚さが薄い第2半導体チップ5(または第4半導体チップ7)を16段全てに使用して積層したものであり、折り返し積層を行わない構造のものである。このような積層構造の半導体装置に対しても、半導体ウエハのダイシング工程において、上記したように、半導体ウエハに形成された基準部分に向かってブレードを進行させることで、たとえ、半導体ウエハの厚さが薄くなったとしても、チップクラックを抑制できる。しかしながら、平面形状が長方形から成る半導体チップを、複数段に亘って、かつ同一の積層方向で階段状に搭載するため、前記実施の形態1のような積層構造に比べて、半導体装置の小型化には不向きである。
次に、第2変形例について説明する。
次に、第3変形例について説明する。
また、前記実施の形態1では、半導体装置の一例として、LGA1を取り上げて説明したが、前記半導体装置はLGA1に限定されるものではなく、基材である配線基板3上に薄型の半導体チップが搭載されたBGA(Ball Grid Array)等であってもよい。
また、前記実施の形態1では配線基板3の上面3aに配線パターン等による凹凸が形成されており、この凹凸を吸収するために、厚さが厚い第1半導体チップ4+厚さの厚い第1接着層8の組み合わせを用いる場合を説明したが、配線基板3の上面3aの平坦度が確保されている場合には、最下段の半導体チップは、厚さが薄い半導体チップ+厚さが薄い接着層の組み合わせを用いてもよい。その場合には、チップの多段積層において第1,第2,第4半導体チップが薄いチップとなり、第3半導体チップのみが、第1,第2,第4半導体チップより厚さが厚い構成となる。
また、前記実施の形態1,2では、第1の厚さ(Tw1)を有する第1半導体チップ4の裏面4dに形成される接着層の厚さを、第2の厚さ(Tw2)を有する第2半導体チップ5の裏面5dに形成される接着層の厚さよりも大きいものを使用することについて説明した。しかしながら、例えば、5段目の半導体チップとして使用する第1半導体チップ4の厚さが、4段目の半導体チップに接続されるワイヤが6段目の半導体チップに接続しない程度の厚さであれば、5段目の半導体チップに形成する接着層は、図6に示すような、第2の厚さ(Td2)を有する接着層9を使用してもよい。これにより、半導体装置(LGA)1の厚さを薄くすることができる。
2 ワイヤ
2a 第1ワイヤ
2b 第2ワイヤ
2c ボール部
2d 中心部
2e ボール部
2f 中心部
2g 第1バンプ電極
2h 傾斜面
2i 中心部
2j 第1部分
2k 第2部分
2m 第2バンプ電極
2n 屈曲点
2p 端部(一部)
2q 肉薄部分
2r 肉厚部分
2s 傾斜面
2t 第3ワイヤ
2u 第4ワイヤ
3 配線基板(基材)
3a 上面(表面)
3b 下面(裏面)
3c コア層(コア材)
3d ボンディングリード
3e 第1ボンディングリード
3f 第2ボンディングリード
3g バンプランド
3h 上面側配線層
3i 下面側配線層
3j ソルダレジスト膜
3k 辺(第1基板辺)
3m 辺(第2基板辺)
3n ビア配線
4 第1半導体チップ
4a 第1表面
4b 第1裏面
4c 第1ボンディングパッド
4d 第1チップ辺
4e 中心部
5 第2半導体チップ
5a 第2表面
5b 第2裏面
5c 第2ボンディングパッド
5d 第2チップ辺
6 第3半導体チップ
6a 第3表面
6b 第3裏面
6c 第3ボンディングパッド
6d 第3チップ辺
7 第4半導体チップ
7a 第4表面
7b 第4裏面
7c 第4ボンディングパッド
7d 第4チップ辺
8 接着層(第1接着層、DAF)
9 接着層(第2接着層、DAF)
10 封止体
11 半導体ウエハ
11a 表面
11b 裏面
11c 切り込み部
11d オリエンテーションフラット(基準部分)
11e ノッチ(基準部分)
11f 中心点
11g 第1部分
11h 第1点
11i 第2部分
11j 第2点
11k 第1方向
11m 第1の直線
11n 第2の直線
11p 辺
12 ブレード
13 真空ステージ
14 バックグラインドテープ
15 ダイシングテープ
16 ウエハリング
17 レーザーダイサー
17a レーザー
18 コレット
19 突き上げユニット
19a 突き上げブロック
20 多数個取り基板(基材)
21 キャピラリ
21a 先端面
21b 傾斜部
21c 中心部
21d 第2方向
21e 軌跡
22 一括封止体
23 隙間
24 仮想線
25 カード型半導体パッケージ(半導体装置)
26,26a,26b,26c フレームタイプ半導体パッケージ(半導体装置)
27,27a,27b フレームタイプ半導体パッケージ(半導体装置)
28a インナリード(配線パターン)
28b アウタリード
28c 連結リード
Claims (4)
- 以下の工程を含む半導体装置の製造方法:
(a)平面形状が四角形から成る上面、前記上面の第1基板辺に沿って形成された複数の第1ボンディングリード、前記第1基板辺と対向する第2基板辺に沿って形成された複数の第2ボンディングリード、および前記上面とは反対側の下面を有する基材を準備する工程;
(b)前記(a)工程の後、平面形状が四角形から成る第1表面、前記第1表面の第1チップ主辺に沿って形成された複数の第1ボンディングパッド、および前記第1表面とは反対側の第1裏面を有する第1半導体チップを、平面視において、前記第1チップ主辺と前記第1基板辺との間隔が、前記第1チップ主辺と前記第2基板辺との間隔よりも小さくなるように、第1接着層を介して前記基材の前記上面上に配置する工程;
(c)前記(b)工程の後、平面形状が四角形から成る第2表面、前記第2表面の第2チップ主辺に沿って形成された複数の第2ボンディングパッド、および前記第2表面とは反対側の第2裏面を有する第2半導体チップを、平面視において、前記第2チップ主辺と前記第1基板辺との間隔が、前記第2チップ主辺と前記第2基板辺との間隔よりも小さく、かつ前記複数の第1ボンディングパッドが前記第2半導体チップから露出するように、かつ前記第2チップ主辺と対向する第2チップ対向辺が前記第1半導体チップの前記第1チップ主辺と対向する第1チップ対向辺から迫り出すように、第2接着層を介して前記第1半導体チップ上に配置する工程;
(d)前記(c)工程の後、平面形状が四角形から成る第3表面、前記第3表面の第3チップ主辺に沿って形成された複数の第3ボンディングパッド、および前記第3表面とは反対側の第3裏面を有する第3半導体チップを、平面視において、前記第3チップ主辺と前記第1基板辺との間隔が、前記第3チップ主辺と前記第2基板辺との間隔よりも小さく、かつ前記複数の第2ボンディングパッドが前記第3半導体チップから露出するように、かつ前記第3チップ主辺と対向する第3チップ対向辺が前記第2半導体チップの前記第2チップ対向辺から迫り出すように、第3接着層を介して前記第2半導体チップ上に配置する工程;
(e)前記(d)工程の後、平面形状が四角形から成る第4表面、前記第4表面の第4チップ主辺に沿って形成された複数の第4ボンディングパッド、および前記第4表面とは反対側の第4裏面を有する第4半導体チップを、平面視において、前記第4チップ主辺と前記第1基板辺との間隔が、前記第4チップ主辺と前記第2基板辺との間隔よりも小さく、かつ前記複数の第3ボンディングパッドが前記第4半導体チップから露出するように、かつ前記第4チップ主辺と対向する第4チップ対向辺が前記第3半導体チップの前記第3チップ対向辺から迫り出すように、第4接着層を介して前記第3半導体チップ上に配置する工程;
(f)前記(e)工程の後、前記複数の第1ボンディングパッドに複数の第1ワイヤをそれぞれ電気的に接続する工程;
(g)前記(f)工程の後、前記複数の第2ボンディングパッドに複数の第2ワイヤをそれぞれ電気的に接続する工程;
(h)前記(g)工程の後、前記複数の第3ボンディングパッドに複数の第3ワイヤをそれぞれ電気的に接続する工程;
(i)前記(h)工程の後、前記複数の第4ボンディングパッドに複数の第4ワイヤをそれぞれ電気的に接続する工程;
(j)前記(i)工程の後、平面形状が四角形から成る第5表面、前記第5表面の第5チップ主辺に沿って形成された複数の第5ボンディングパッド、および前記第5表面とは反対側の第5裏面を有する第5半導体チップを、平面視において、前記第5チップ主辺と前記第2基板辺との間隔が、前記第5チップ主辺と前記第1基板辺との間隔よりも小さく、かつ前記複数の第4ボンディングパッドが前記第5半導体チップから露出するように、かつ前記第5チップ主辺が前記第4半導体チップの前記第4チップ対向辺から迫り出すように、第5接着層を介して前記第4半導体チップ上に配置する工程;
(k)前記(j)工程の後、平面形状が四角形から成る第6表面、前記第6表面の第6チップ主辺に沿って形成された複数の第6ボンディングパッド、および前記第6表面とは反対側の第6裏面を有する第6半導体チップを、平面視において、前記第6チップ主辺と前記第2基板辺との間隔が、前記第6チップ主辺と前記第1基板辺との間隔よりも小さく、かつ平面視において、前記第4半導体チップの前記第4表面が前記第6半導体チップで覆われ、かつ前記複数の第5ボンディングパッドが前記第6半導体チップから露出するように、かつ前記第6チップ主辺と対向する第6チップ対向辺が前記第5半導体チップの前記第5チップ主辺と対向する第5チップ対向辺から迫り出すように、第6接着層を介して前記第5半導体チップ上に配置する工程;
(l)前記(k)工程の後、平面形状が四角形から成る第7表面、前記第7表面の第7チップ主辺に沿って形成された複数の第7ボンディングパッド、および前記第7表面とは反対側の第7裏面を有する第7半導体チップを、平面視において、前記第7チップ主辺と前記第2基板辺との間隔が、前記第7チップ主辺と前記第1基板辺との間隔よりも小さく、かつ平面視において、前記第3半導体チップの前記第3表面が前記第7半導体チップで覆われ、かつ前記複数の第6ボンディングパッドが前記第7半導体チップから露出するように、かつ前記第7チップ主辺と対向する第7チップ対向辺が前記第6半導体チップの前記第6チップ対向辺から迫り出すように、第7接着層を介して前記第6半導体チップ上に配置する工程;
(m)前記(l)工程の後、平面形状が四角形から成る第8表面、前記第8表面の第8チップ主辺に沿って形成された複数の第8ボンディングパッド、および前記第8表面とは反対側の第8裏面を有する第8半導体チップを、平面視において、前記第8チップ主辺と前記第2基板辺との間隔が、前記第8チップ主辺と前記第1基板辺との間隔よりも小さく、かつ平面視において、前記第2半導体チップの前記第2表面が前記第8半導体チップで覆われ、かつ前記複数の第7ボンディングパッドが前記第8半導体チップから露出するように、かつ前記第8チップ主辺と対向する第8チップ対向辺が前記第7半導体チップの前記第7チップ対向辺から迫り出すように、第8接着層を介して前記第7半導体チップ上に配置する工程;
(n)前記(m)工程の後、前記複数の第5ボンディングパッドに複数の第5ワイヤをそれぞれ電気的に接続する工程;
(o)前記(n)工程の後、前記複数の第6ボンディングパッドに複数の第6ワイヤをそれぞれ電気的に接続する工程;
(p)前記(o)工程の後、前記複数の第7ボンディングパッドに複数の第7ワイヤをそれぞれ電気的に接続する工程;
(q)前記(p)工程の後、前記複数の第8ボンディングパッドに複数の第8ワイヤをそれぞれ電気的に接続する工程;
(r)前記(q)工程の後、前記第1乃至第8半導体チップと前記複数の第1乃至第8ワイヤを樹脂で封止する工程;
ここで、
前記基材の前記上面には、さらに、複数の配線と、前記複数の配線を覆うソルダレジスト膜が形成されており、
前記第8半導体チップは、前記基材の前記上面上に配置された複数の半導体チップのうちの最上段の半導体チップであり、
前記第1、第5および第8半導体チップのそれぞれの厚さは、前記第2、第3、第4、第6および第7半導体チップのそれぞれの厚さよりも厚く、
前記第1、第5および第8半導体チップのそれぞれの厚さは、互いに同じ厚さである。 - 請求項1において、
前記第4半導体チップと前記第5半導体チップとの間には、さらに、複数の半導体チップが配置されている、半導体装置の製造方法。 - 請求項1において、
前記第5半導体チップと前記第8半導体チップとの間には、さらに、複数の半導体チップが配置されている、半導体装置の製造方法。 - 請求項1において、
前記(f)工程では、前記複数の第1ワイヤの一部を前記複数の第1ボンディングリードにそれぞれ接続した後、前記複数の第1ワイヤの他部を前記複数の第1ボンディングパッドにそれぞれ接続し、
前記(g)工程では、前記複数の第2ワイヤの一部を前記複数の第1ボンディングパッドにそれぞれ接続した後、前記複数の第2ワイヤの他部を前記複数の第2ボンディングパッドにそれぞれ接続し、
前記(h)工程では、前記複数の第3ワイヤの一部を前記複数の第2ボンディングパッドにそれぞれ接続した後、前記複数の第3ワイヤの他部を前記複数の第3ボンディングパッドにそれぞれ接続し、
前記(i)工程では、前記複数の第4ワイヤの一部を前記複数の第3ボンディングパッドにそれぞれ接続した後、前記複数の第4ワイヤの他部を前記複数の第4ボンディングパッドにそれぞれ接続し、
前記(n)工程では、前記複数の第5ワイヤの一部を前記複数の第2ボンディングリードにそれぞれ接続した後、前記複数の第5ワイヤの他部を前記複数の第5ボンディングパッドにそれぞれ接続し、
前記(o)工程では、前記複数の第6ワイヤの一部を前記複数の第5ボンディングパッドにそれぞれ接続した後、前記複数の第6ワイヤの他部を前記複数の第6ボンディングパッドにそれぞれ接続し、
前記(p)工程では、前記複数の第7ワイヤの一部を前記複数の第6ボンディングパッドにそれぞれ接続した後、前記複数の第7ワイヤの他部を前記複数の第7ボンディングパッドにそれぞれ接続し、
前記(q)工程では、前記複数の第8ワイヤの一部を前記複数の第7ボンディングパッドにそれぞれ接続した後、前記複数の第8ワイヤの他部を前記複数の第8ボンディングパッドにそれぞれ接続する、半導体装置の製造方法。
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US14/150,972 US9177936B2 (en) | 2010-01-08 | 2014-01-09 | Method of manufacturing semiconductor device |
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