JP5463908B2 - キャパシタ搭載インターポーザ及びその製造方法 - Google Patents
キャパシタ搭載インターポーザ及びその製造方法 Download PDFInfo
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- JP5463908B2 JP5463908B2 JP2009501297A JP2009501297A JP5463908B2 JP 5463908 B2 JP5463908 B2 JP 5463908B2 JP 2009501297 A JP2009501297 A JP 2009501297A JP 2009501297 A JP2009501297 A JP 2009501297A JP 5463908 B2 JP5463908 B2 JP 5463908B2
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Description
△V=R×i−L×di/dt・・・・・・(1)
ここで、Rは、LSIと電源装置との間の配線の抵抗、iは、スイッチングによって回路を流れる負荷電流、LはLSIと電源装置との間の配線のインダクタンスである。
前記キャパシタ基板は、第1の基板本体と、該第1の基板本体の主面上に形成されたキャパシタと、該キャパシタを覆うカバー絶縁膜と、前記キャパシタの電極に接続され前記カバー絶縁膜の表面に形成された端子電極と、前記第1の基板本体の裏面に形成された電極パッドと、前記端子電極と前記電極パッドとを接続するビアプラグとを備え、
前記プラグ基板は、第2の基板本体と、該第2の基板本体の主面上に、前記キャパシタ基板の端子電極に対応して形成された接続パッドと、前記第2の基板本体を貫通し前記接続パッドに接続されるビアプラグとを備え、
前記キャパシタ基板の端子電極と前記プラグ基板の接続パッドとが接合されていることを特徴とするキャパシタ搭載インターポーザを提供する。
前記キャパシタ基板は、第1の基板本体と、該第1の基板本体の主面上に形成されたキャパシタと、該キャパシタを覆うカバー絶縁膜と、前記キャパシタの電極に接続され前記カバー絶縁膜の表面に形成された端子電極と、前記端子電極を前記第1の基板本体の裏面から露出させるビアプラグホールとを備え、
前記プラグ基板は、第2の基板本体と、該第2の基板本体の主面上に、前記キャパシタ基板の端子電極に対応して形成された接続パッドと、前記第2の基板本体を貫通し前記接続パッドに接続されるビアプラグとを備え、
前記キャパシタ基板の端子電極と前記プラグ基板の接続パッドとが接合されていることを特徴とするキャパシタ搭載インターポーザを提供する。
図9〜図12は、本発明の第1実施例に係るキャパシタ搭載インターポーザの製造方法について、各製造段階を順次に示す断面図である。本実施例では、図7A〜図7Fの手順に従い、図2と同様のキャパシタ搭載インターポーザを実際に製造した。先ず、ベース基板21aとして4インチのシリコンウエハを用意し、温度が900℃の水蒸気中でベース基板21aの主面を熱酸化して200nmの厚みを有する酸化膜を形成した。
図13〜図15は、本発明の第2実施例に係るキャパシタ搭載インターポーザの製造方法について、各製造段階を順次に示す断面図である。本実施例では、図7A〜図7E、及び、図8A〜図8Cの手順に従い、図6と同様のキャパシタ搭載インターポーザを実際に製造した。キャパシタ基板のベース基板21aとして、アルカリフリーガラスを用い、ベース基板21a上にキャパシタ22、カバー絶縁膜25、端子電極26、及び、バリアメタル膜45を形成し、図15示す構造を得た。
本発明のキャパシタ搭載インターポーザの製造方法では、前記第1の基板の端子電極と前記第2の基板の接続パッドとを接合した後に、前記第1の基板を裏面から研磨する構成を採用できる。この場合、第1の基板の破損を抑制しつつも、小さな厚みを有するキャパシタ基板の基板本体を形成できる。キャパシタ基板の基板本体の厚みを小さくすることによって、LSIとキャパシタとの間の配線距離を小さくして、インダクタンスL1を小さく出来る。また、スルーホールの形成やスルーホール内へのビアプラグの充填を容易にできると共に、キャパシタ基板の基板本体の材料選択の幅を広げることが出来る。
Claims (25)
- ビアプラグが形成されたプラグ基板と、キャパシタが形成されたキャパシタ基板とを有するキャパシタ搭載インターポーザであって、
前記キャパシタ基板は、第1の基板本体と、該第1の基板本体の主面上に形成されたキャパシタと、該キャパシタを覆うカバー絶縁膜と、前記キャパシタの電極に接続され前記カバー絶縁膜の表面に形成された端子電極と、前記第1の基板本体の裏面に形成された電極パッドと、前記端子電極と前記電極パッドとを接続するビアプラグとを備え、
前記プラグ基板は、第2の基板本体と、該第2の基板本体の主面上に、前記キャパシタ基板の端子電極に対応して形成された接続パッドと、前記第2の基板本体を貫通し前記接続パッドに接続されるビアプラグとを備え、
前記キャパシタ基板の端子電極と前記プラグ基板の接続パッドとが接合されていることを特徴とするキャパシタ搭載インターポーザ。 - ビアプラグが形成されたプラグ基板と、キャパシタが形成されたキャパシタ基板とを有するキャパシタ搭載インターポーザであって、
前記キャパシタ基板は、第1の基板本体と、該第1の基板本体の主面上に形成されたキャパシタと、該キャパシタを覆うカバー絶縁膜と、前記キャパシタの電極に接続され前記カバー絶縁膜の表面に形成された端子電極と、前記端子電極を前記第1の基板本体の裏面から露出させるビアプラグホールとを備え、
前記プラグ基板は、第2の基板本体と、該第2の基板本体の主面上に、前記キャパシタ基板の端子電極に対応して形成された接続パッドと、前記第2の基板本体を貫通し前記接続パッドに接続されるビアプラグとを備え、
前記キャパシタ基板の端子電極と前記プラグ基板の接続パッドとが接合されていることを特徴とするキャパシタ搭載インターポーザ。 - 前記キャパシタ基板の端子電極は、前記カバー絶縁膜を貫通して形成されている、請求項1又は2に記載のキャパシタ搭載インターポーザ。
- 前記キャパシタ基板の端子電極と前記プラグ基板の接続パッドとが接合電極を介して接続されており、前記キャパシタ基板と前記プラグ基板との間が樹脂材料で充填されている、請求項1〜3の何れか一に記載のキャパシタ搭載インターポーザ。
- 前記キャパシタ基板の基板本体が、主面及び裏面が絶縁膜で被覆された半導体基板である、請求項1〜4の何れか一に記載のキャパシタ搭載インターポーザ。
- 前記キャパシタ基板の前記半導体基板がシリコン基板である、請求項5に記載のキャパシタ搭載インターポーザ。
- 前記キャパシタ基板の基板本体が絶縁体基板である、請求項1〜4の何れか一に記載のキャパシタ搭載インターポーザ。
- 前記キャパシタ基板の前記絶縁体基板がガラス基板である、請求項7に記載のキャパシタ搭載インターポーザ。
- 前記キャパシタ基板の前記絶縁体基板がセラミック基板である、請求項7に記載のキャパシタ搭載インターポーザ。
- 前記キャパシタ基板の前記絶縁体基板が樹脂基板である、請求項7に記載のキャパシタ搭載インターポーザ。
- 前記プラグ基板の基板本体が半導体基板である、請求項1〜4の何れか一に記載のキャパシタ搭載インターポーザ。
- 前記半導体基板がシリコン基板である、請求項11に記載のキャパシタ搭載インターポーザ。
- 前記プラグ基板の基板本体が絶縁体基板である、請求項1〜4の何れか一に記載のキャパシタ搭載インターポーザ。
- 前記プラグ基板の前記絶縁体基板がガラス基板である、請求項13に記載のキャパシタ搭載インターポーザ。
- 前記プラグ基板の前記絶縁体基板が感光性ガラス基板である、請求項13に記載のキャパシタ搭載インターポーザ。
- 前記プラグ基板の前記絶縁体基板がセラミック基板である、請求項13に記載のキャパシタ搭載インターポーザ。
- 前記プラグ基板の前記絶縁体基板がガラス−セラミック複合体基板である、請求項13に記載のキャパシタ搭載インターポーザ。
- 前記プラグ基板の前記絶縁体基板が樹脂基板である、請求項13に記載のキャパシタ搭載インターポーザ。
- 前記端子電極の裏面には、バリア層が形成されている、請求項1〜18の何れか一に記載のキャパシタ搭載インターポーザ。
- 前記キャパシタ基板の第1の基板本体の厚みが、15μm以下である、請求項1〜19の何れか一に記載のキャパシタ搭載インターポーザ。
- 第1の基板の主面上にキャパシタを形成する工程と、前記キャパシタを絶縁膜で覆う工程と、前記絶縁膜を貫通して前記キャパシタの端子電極を形成する工程と、第1のビアプラグが接続された接続パッドを有する第2の基板を形成する工程と、前記第1の基板の端子電極と前記第2の基板の接続パッドとを接合する工程と、前記第1の基板を裏面から研磨する工程と、前記研磨された第1の基板の裏面から、選択的にエッチングして前記第1の基板の端子電極を露出するビアプラグホールを形成する工程とを有することを特徴とするキャパシタ搭載インターポーザの製造方法。
- 前記ビアプラグホール内に第2のビアプラグを充填する工程を更に有する、請求項21に記載のキャパシタ搭載インターポーザの製造方法。
- 前記第2のビアプラグを介して前記キャパシタの端子電極に接続される電極パッドを、前記第1の基板本体の裏面に形成する工程を更に有する、請求項22に記載のキャパシタ搭載インターポーザの製造方法。
- 第1の基板の主面上に複数のキャパシタを形成する工程と、前記キャパシタを絶縁膜で覆う工程と、前記絶縁膜を貫通して前記キャパシタの端子電極を形成する工程と、前記キャパシタ及び端子電極が形成された第1の基板をそれぞれが1つ以上のキャパシタを含む複数の基板部分に切断する工程と、ビアプラグが接続された接続パッドを有する第2の基板を形成する工程と、前記基板部分に形成された端子電極と前記第2の基板の接続パッドとを接合する工程と、前記基板部分を裏面から研磨する工程と、前記研磨された基板部分の裏面から、選択的にエッチングして前記端子電極を露出するビアプラグホールを形成する工程とを有することを特徴とするキャパシタ搭載インターポーザの製造方法。
- 前記ビアプラグホール内に第2のビアプラグを充填する工程と、前記第2のビアプラグを介して前記キャパシタの端子電極に接続される電極パッドを、前記基板部分の裏面に形成する工程とを更に有する、請求項24に記載のキャパシタ搭載インターポーザの製造方法。
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