JP2007165671A - 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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- JP2007165671A JP2007165671A JP2005361371A JP2005361371A JP2007165671A JP 2007165671 A JP2007165671 A JP 2007165671A JP 2005361371 A JP2005361371 A JP 2005361371A JP 2005361371 A JP2005361371 A JP 2005361371A JP 2007165671 A JP2007165671 A JP 2007165671A
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Abstract
【解決手段】マザーチップのメタルポスト上に半田膜を形成する第1工程と、第1工程の後に、マザーチップ上に半田ペーストを印刷し、マザーチップを加熱して半田ペーストをリフローさせて半田ボールを形成する第2工程と、第2工程の後に、マザーチップのメタルポストとドータチップのメタルポストとを半田膜を介して熱圧着させる第3工程と、半田ボールを用いて回路基板上にマザーチップをフリップチップ接続する第4工程とを有し、第2工程において、酸素濃度が500ppm以下の窒素雰囲気中においてマザーチップを加熱する。
【選択図】図3
Description
図1のフローチャート及び図面を参照しながら、実施の形態1に係る半導体装置の製造方法について説明する。
本実施の形態では、実施の形態1のように半田ボールを形成するためのリフローを窒素雰囲気中で行う代わりに、半田ボールを形成した後に水素プラズマにより半田膜の表面に形成された酸化膜を除去する。すなわち、半田ボール19リフロー工程の後に、半田膜17表面に形成された酸化膜を除去する、もしくは酸化膜厚を問題ないレベル(数nm以下)にまで低減することによって、後のチップ・オン・チップ接続工程時の接合性を改善することが出来る。このような手段として、還元性のプラズマである水素プラズマ雰囲気に晒すことにより、水素プラズマ中で生成した水素ラジカルの還元作用により、酸化膜を効果的に除去もしくは低減する事が可能である。その他の工程は実施の形態1と同様である。これにより、実施の形態1と同様の効果を奏する。
本実施の形態では、実施の形態1のように半田ボールを形成するためのリフローを窒素雰囲気中で行う代わりに、半田ボール19リフロー工程の後に、マザーチップ10ウエハの全面に還元性のフラックスを塗布し、熱処理を施すことによって、フラックスの還元作用により、酸化膜を除去もしくは低減することが可能である。すなわち、半田ボール19リフロー工程の後に、半田膜17表面に形成された酸化膜を除去する、もしくは酸化膜厚を問題ないレベル(数nm以下)にまで低減することによって、後のチップ・オン・チップ接続工程時の接合性を改善することが出来る。その他の工程は実施の形態1と同様である。これにより、実施の形態1と同様の効果を奏する。
本実施の形態では、図10に示すように、マザーチップ10のメタルポスト16の材料としてNiを用い、ドータチップ20のメタルポスト26の材料としてCuを用いる。その他の構成は実施の形態1〜3と同様である。
本実施の形態では、図15に示すように、マザーチップ10のメタルポスト16及びドータチップ20のメタルポスト26の材料としてNiを用いる。そして、メタルポスト16上に半田膜17を形成し、メタルポスト26上に半田膜27を形成する。その他の構成は実施の形態1〜3と同様である。
本実施の形態では、マザーチップ10のメタルポスト16及びドータチップ20のメタルポスト26として、それぞれの横幅が異なるものを用いる。その他の構成は、実施の形態1〜5と同様である。
図20のフローチャート及び図面を参照しながら、本実施の形態に係る半導体装置の製造方法について説明する。
本実施の形態では、図27(a)に示すように、マザーチップ10のメタルポスト16の横幅をドータチップ20のメタルポスト26の横幅よりも大きくし、メタルポスト26の上面及び側面にAu膜28を形成し、メタルポスト16上に半田膜17を形成する。その他の構成は実施の形態7と同様である。
本実施の形態では、マザーチップ10のメタルポスト16及びドータチップ20のメタルポスト26の材料としてNiを用いる。そして、メタルポスト26の表面にAu膜28を形成し、メタルポスト16上に半田膜17を形成する。その他の構成は実施の形態7と同様である。
本実施の形態では、図31(a)に示すように、マザーチップ10のメタルポスト16の横幅をドータチップ20のメタルポスト26の横幅よりも小さくし、横幅が小さい方のメタルポスト16の上面及び側面にAu膜29を形成し、メタルポスト26上に半田膜27を形成する。
本実施の形態では、図34に示すように、マザーチップ10のメタルポスト16の横幅をドータチップ20のメタルポスト26の横幅よりも小さくし、メタルポスト16の上面にAu膜29を形成し、メタルポスト26上に半田膜27を形成する。その他の構成は実施の形態10と同様である。
本実施の形態では、マザーチップ10のメタルポスト16の材料としてNiを用い、ドータチップ20のメタルポスト26の材料としてCuを用いる。そして、メタルポスト16の表面にAu膜28を形成し、メタルポスト26上に半田膜27を形成する。その他の構成は実施の形態10と同様である。
本実施の形態に係るドータチップを形成する工程について説明する。まず、図36(a)に示すように、基板21上(回路面)にAl電極22を形成し、それ以外の領域を表面保護膜23で覆う。そして、このAl電極22にプローブを当てて検査を行う。この検査はウェハ上に形成された複数のドータチップ20に対してそれぞれ行い、ウェハ上の各ドータチップ20の合否を示すウェハマップを作成する。
本実施の形態では、図37(a)に示すようにマザーチップ10のメタルポスト16とドータチップ20のメタルポスト26を向かい合わせ、図37(b)に示すように、加熱及び加圧だけでなくドータチップ20にスクラブや超音波振動を印加して、メタルポスト16とメタルポスト26とを半田膜17,27を介して熱圧着させる。これにより、半田膜17,27表面の酸化膜を更に確実に破壊することができる。
本実施の形態では、マザーチップ10を形成する際に、まず、実施の形態1のステップS1〜S6と同様の工程を行う。次に、図38に示すように半田ボールを形成する領域に開口を有するレジスト18bを形成し、レジスト18bの開口にメッキ技術などにより半田膜19bを充填する。その後、レジスト18bを除去し、フラックスを塗布し、N2リフロー炉又はN2+H2リフロー炉等においてマザーチップ10を加熱して半田膜19bをリフローさせて半田ボールを形成する。その他の工程は他の実施の形態と同様である。
本実施の形態では、図39に示すように、回路基板33の上面に、ドータチップ20に対応する領域に凹部36を設ける。凹部36の構造としては、例えば、回路基板の最上面に形成される絶縁膜、すなわちソルダレジスト膜の、ドータチップ20に対応する部分を除去する事により構成することが出来る。その他の構成は他の実施の形態と同様である。これにより、ドータチップ20の厚さが例えば50〜300μmと、厚い場合でも、マザーチップ10と回路基板33を良好にフリップチップ接続することができる。また、半田ボール19の高さに制約されることなく、マザーチップ10主面とドータチップ20主面の間隔も広く確保することができる。マザーチップ10主面とドータチップ20主面との間隔を十分に広くしておくと、アンダーフィル樹脂34によってマザーチップ10主面とドータチップ20主面との間を充填することも可能となるため、チップ・オン・チップ間アンダーフィル樹脂の注入工程が不要となり、生産性を向上することができる。マザーチップ10主面とドータチップ20主面との間隔を広げるためには、それぞれのチップに形成するメタルポスト16,26を高くする必要があるが、Ni膜によって形成したメタルポストの高さを5μm以上に高くすると、Ni膜が持つ応力や抵抗によって、半導体装置の信頼性や電気特性に悪影響を及ぼす可能性がある。従って、それぞれのチップに形成するメタルポスト16,26の高さを10μm以上の高さにする場合には、電解メッキによって形成したCu膜を用いることが好ましい。
本実施の形態では、半田ボール19の代わりにAl電極を形成する。そして、マザーチップ10のAl電極と回路基板33の電極をワイヤボンド接合により接続する。その他の構成は実施の形態1と同様である。これにより、半田ボール形成のためのリフローを省略することできるため、半田膜17の表面に厚い酸化膜が形成されるのを防ぐことができ、マザーチップとドータチップの間で接続不良が発生するのを防ぐことができる。なお、回路基板33の代わりに金属リードフレームを用いることもできる。
16,26 メタルポスト
17,27 半田膜
18a メタルマスク
18b レジスト
19a 半田ペースト
19b 半田膜
19 半田ボール
20 ドータチップ
28,29 Au膜
33 回路基板
36 凹部
Claims (24)
- マザーチップのメタルポスト上に半田膜を形成する第1工程と、
前記第1工程の後に、前記マザーチップ上に半田ペーストを印刷し、前記マザーチップを加熱して前記半田ペーストをリフローさせて半田ボールを形成する第2工程と、
前記第2工程の後に、前記マザーチップのメタルポストとドータチップのメタルポストとを前記半田膜を介して熱圧着させる第3工程と、
前記半田ボールを用いて回路基板上に前記マザーチップをフリップチップ接続する第4工程とを有し、
前記第2工程において、酸素濃度が500ppm以下の窒素雰囲気中において前記マザーチップを加熱することを特徴とする半導体装置の製造方法。 - マザーチップのメタルポスト上に半田膜を形成する第1工程と、
前記第1工程の後に、前記マザーチップ上に半田ペーストを印刷し、前記マザーチップを加熱して前記半田ペーストをリフローさせて半田ボールを形成する第2工程と、
前記第2工程の後に、水素プラズマにより前記半田膜の表面に形成された酸化膜を除去する第3工程と、
前記第3工程の後に、前記マザーチップのメタルポストとドータチップのメタルポストとを前記半田膜を介して熱圧着させる第4工程と、
前記半田ボールを用いて回路基板上に前記マザーチップをフリップチップ接続する第5工程とを有することを特徴とする半導体装置の製造方法。 - マザーチップのメタルポスト上に半田膜を形成する第1工程と、
前記第1工程の後に、前記マザーチップ上に半田ペーストを印刷し、前記マザーチップを加熱して前記半田ペーストをリフローさせて半田ボールを形成する第2工程と、
前記第2工程の後に、前記マザーチップのメタルポストとドータチップのメタルポストとを前記半田膜を介して熱圧着させる第3工程と、
前記半田ボールを用いて回路基板上に前記マザーチップをフリップチップ接続する第4工程とを有し、
前記半田ペーストをリフローする前に、前記マザーチップ上にフラックスを塗布することを特徴とする半導体装置の製造方法。 - ドータチップのメタルポストの表面にAu膜を形成する第1工程と、
マザーチップのメタルポスト上に半田膜を形成する第2工程と、
前記第2工程の後に、前記マザーチップ上に半田ペーストを印刷し、前記マザーチップを加熱して前記半田ペーストをリフローさせて半田ボールを形成する第3工程と、
前記第3工程の後に、前記マザーチップのメタルポストと前記ドータチップのメタルポストとを前記半田膜を介して熱圧着させる第4工程と、
前記半田ボールを用いて回路基板上に前記マザーチップをフリップチップ接続する第5工程とを有することを特徴とする半導体装置の製造方法。 - 前記マザーチップのメタルポストと前記ドータチップのメタルポストとを前記半田膜を介して熱圧着させる際に、前記ドータチップを前記半田膜の融点よりも高温に加熱し、前記マザーチップを前記半田ボールの融点より低くすることを特徴とする請求項1〜4の何れか1項に記載の半導体装置の製造方法。
- 前記マザーチップのメタルポスト及び前記ドータチップのメタルポストとして、それぞれの横幅が異なるものを用いることを特徴とする請求項1〜5の何れか1項に記載の半導体装置の製造方法。
- 前記マザーチップのメタルポストの横幅を前記ドータチップのメタルポストの横幅よりも大きくし、前記ドータチップのメタルポストの上面及び側面に前記Au膜を形成することを特徴とする請求項4に半導体装置の製造方法。
- 前記マザーチップのメタルポストの材料としてNiを用い、前記ドータチップのメタルポストの材料としてCuを用いることを特徴とする請求項1〜7の何れか1項に記載の半導体装置の製造方法。
- 前記マザーチップのメタルポスト及び前記ドータチップのメタルポストの材料としてNiを用い、前記マザーチップのメタルポストと前記ドータチップのメタルポストの間隔を5μm以下に狭めることを特徴とする請求項1〜7の何れか1項に記載の半導体装置の製造方法。
- ドータチップのメタルポストの表面に半田膜を形成する第1工程と、
マザーチップのメタルポスト上にAu膜を形成する第2工程と、
前記第2工程の後に、前記マザーチップ上に半田ペーストを印刷し、前記マザーチップを加熱して前記半田ペーストをリフローさせて半田ボールを形成する第3工程と、
前記第3工程の後に、前記マザーチップのメタルポストと前記ドータチップのメタルポストとを前記半田膜を介して熱圧着させる第4工程と、
前記半田ボールを用いて回路基板上に前記マザーチップをフリップチップ接続する第5工程とを有し、
前記マザーチップのメタルポストの横幅を前記ドータチップのメタルポストの横幅よりも小さくすることを特徴とする半導体装置の製造方法。 - 前記マザーチップのメタルポストの上面及び側面に前記Au膜を形成することを特徴とする請求項10に記載の半導体装置の製造方法。
- 前記ドータチップのメタルポスト又は前記マザーチップのメタルポストを無電解メッキにより形成することを特徴とする請求項1〜11の何れか1項に記載の半導体装置の製造方法。
- マザーチップのメタル膜上に半田膜を形成した第1のバンプを準備する第1工程と、
前記マザーチップを加熱して前記第1のバンプの半田膜をリフローする第2工程と、
前記第2工程の後に、前記マザーチップの半田膜とドータチップの第2のバンプとを前記半田膜を介して熱圧着させる第3工程と、
前記第2工程において、酸素濃度が500ppm以下の窒素雰囲気中において前記マザーチップを加熱することを
特徴とする半導体装置の製造方法。 - マザーチップのメタル膜上に半田膜を形成した第1のバンプを準備する第1工程と、
前記マザーチップの前記第1のバンプの表面にフラックスを塗布する第2工程と、
前記マザーチップを加熱して前記第1のバンプの半田膜をリフローする第3工程と、
前記第3工程の後に、前記マザーチップの半田膜とドータチップの第2のバンプとを前記半田膜を介して熱圧着させる第4工程とを有することを特徴とする半導体装置の製造方法。 - 前記ドータチップの前記第2のバンプは、前記ドータチップ上に形成されたメタル膜と、その上に形成された半田膜とを有することを特徴とする請求項13〜14の何れかに記載の半導体装置の製造方法。
- 前記ドータチップの前記第2のバンプは、前記ドータチップ上に形成されたメタル膜と、その上に形成された金膜を有することを特徴とする請求項13〜14の何れかに記載の半導体装置の製造方法。
- 前記マザーチップの前記メタル膜がNiを含み、前記ドータチップの前記メタル膜がCuを含むことを特徴とした請求項15〜16の何れかに記載の半導体装置の製造方法。
- 前記マザーチップの前記第1のバンプと、前記ドータチップの前記第2のバンプとを前記半田膜を介して熱圧着させる際に、
前記ドータチップを前記半田膜の融点よりも高温に加熱し、前記マザーチップを前記半田膜の融点より低くした状態で、前記第1バンプと前記第2バンプとを接触させることを特徴とする、請求項13〜14の何れかに記載の半導体装置の製造方法。 - 前記マザーチップの前記第1のバンプと、前記ドータチップの第2のバンプとを前記半田膜を介して熱圧着させる際に、
前記第1のバンプ及び前記第2のバンプの周囲に前記半田膜をはみ出すように熱圧着させることを特徴とする請求項13〜14の何れかに記載の半導体装置の製造方法。 - 前記マザーチップのメタル膜と、前記ドータチップのメタル膜とは、それぞれのチップと平行な平面で切った断面の径が異なることを特徴とする請求項13〜14の何れかに記載の半導体装置の製造方法。
- 前記マザーチップのメタル膜の幅を前記ドータチップのメタル膜の幅よりも大きくし、前記ドータチップのメタル膜の上面及び側面にAu膜を形成することを特徴とする請求項13〜14の何れかに記載の半導体装置の製造方法。
- 前記マザーチップの前記第1のバンプと、前記ドータチップの第2のバンプとを前記半田膜を介して熱圧着させる工程において、前記マザーチップのメタルと前記ドータチップのメタル間を前記半田膜内に形成した合金によって架橋することを特徴とする請求項13〜14の何れかに記載の半導体装置の製造方法。
- 前記マザーチップのメタル膜及び前記ドータチップのメタル膜がNiを含み、
前記半田膜を介して熱圧着させる工程において、前記マザーチップのメタル膜と、前記ドータチップのメタル膜との間隔を5μm以下に狭めることを特徴とする請求項13〜14の何れかに記載の半導体装置の製造方法。 - 前記ドータチップのメタル膜、または前記マザーチップのメタル膜を無電解めっきにより形成することを特徴とする請求項13〜14の何れかに記載の半導体装置の製造方法。
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JP2013206920A (ja) * | 2012-03-27 | 2013-10-07 | Toyota Central R&D Labs Inc | 回路素子を備えるモジュール |
US8981574B2 (en) | 2012-12-20 | 2015-03-17 | Samsung Electronics Co., Ltd. | Semiconductor package |
US9633973B2 (en) | 2012-12-20 | 2017-04-25 | Samsung Electronics Co., Ltd. | Semiconductor package |
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JP2018160603A (ja) * | 2017-03-23 | 2018-10-11 | 株式会社デンソー | はんだ接合体およびその製造方法 |
US10910331B2 (en) | 2017-11-07 | 2021-02-02 | Lapis Semiconductor Co., Ltd. | Semiconductor device bonding area including fused solder film and manufacturing method |
US11545452B2 (en) | 2017-11-07 | 2023-01-03 | Lapis Semiconductor Co., Ltd. | Semiconductor device bonding area including fused solder film and manufacturing method |
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