JPWO2018211614A1 - 薄膜キャパシタ構造、および当該薄膜キャパシタ構造を備えた半導体装置 - Google Patents
薄膜キャパシタ構造、および当該薄膜キャパシタ構造を備えた半導体装置 Download PDFInfo
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- 239000010409 thin film Substances 0.000 title claims abstract description 106
- 239000003990 capacitor Substances 0.000 title claims abstract description 94
- 239000004065 semiconductor Substances 0.000 title claims description 33
- 239000010408 film Substances 0.000 claims abstract description 68
- 239000000758 substrate Substances 0.000 claims description 24
- 239000004020 conductor Substances 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 15
- 229910052802 copper Inorganic materials 0.000 description 14
- 239000010949 copper Substances 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 5
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- 229910052751 metal Inorganic materials 0.000 description 2
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- 239000011265 semifinished product Substances 0.000 description 2
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
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- 239000009719 polyimide resin Substances 0.000 description 1
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Abstract
Description
本構成によれば、第1絶縁膜から薄膜キャパシタを経由して第2絶縁膜まで貫通し、複数の電極パッドに対応する位置に形成された複数の貫通孔が設けられている。そのため、薄膜キャパシタをエリアアレイ型集積回路に接合する際に、この複数の貫通孔に銅ペースト等の導電部材を電極パッドに達するまで充填することによって、薄膜キャパシタをエリアアレイ型集積回路に接合することができる。それにより、薄膜キャパシタの上部に端子アレーを形成したり、あるいはエリアアレイ型集積回路の電極パッドに接続バンプを形成したりする必要がない。また、薄膜キャパシタをエリアアレイ型集積回路の電極パッド面にほぼ最短距離で結合することができる。その結果、薄膜キャパシタと集積回路との接続構成を簡略化できるとともに、薄膜キャパシタの配線に係るインピーダンスを低減できる。
本構成によれば、複数の貫通孔に銅ペースト等の導電部材を電極パッドに充填する際に、第1張り出し部および第2張り出し部によって導電部材が第1シート電極および第2シート電極に接合する面請が増加する。それによって、導電部材と、第1シート電極および第2シート電極との接合をより強固なものとすることができ、それによって導電部材と各シート電極との接合の信頼性が向上される。また、各開口部によって、電源用貫通孔、グランド用貫通孔、および信号用貫通孔を形成できる。また、グランドパッド用開口部によって第1張り出し部を、電源パッド用開口部によって第2張り出し部を、簡易な構成で形成できる。
本構成によれば、第1シート電極の一部および第2シート電極の一部を絶縁しつつ、各開口部によって電源用貫通孔、グランド用貫通孔、および信号用貫通孔を形成できる。
本構成によれば、薄膜キャパシタとエリアアレイ型集積回路との接続構成を簡略化できるとともに、薄膜キャパシタの配線に係るインピーダンスを低減できる。
本構成によれば、例えば接続パッドに半田マイクロバンプを形成することによって、薄膜キャパシタを備えたエリアアレイ型の半導体装置を構築でき、半導体装置を外部回路に接続することができる。
本構成によれば、中間基板に再配線層を設けることによってエリアアレイ型集積回路の電極パッドピッチを変更することができる。それによって、半導体装置を、集積回路の電極ピッチとは異なる電極ピッチの外部回路基板、例えば、マザーボードに接続することができる。
一実施形態を図1から図11を参照して説明する。なお、図中、同一の符号は、同一又は相当部分を示す。また、図1の矢印Zで示される方向を上方向とする。なお、図1等の断面図において、薄膜部分の厚さ方向の寸法が説明の便宜上、拡大されて示されている。そのため、断面図の上下方向の寸法は実際の寸法とは異なる。
図1に示されるように、半導体装置100は、大きくは、LSIチップ(「エリアアレイ型集積回路」の一例)2と、薄膜キャパシタ構造50とを含む。なお、図1は、図7の一点鎖線A−Aで示される位置に対応した半導体装置100の断面図である。
薄膜キャパシタ構造50は、図1に示されるように、大きくは、薄膜キャパシタ10、第1絶縁膜21、および第2絶縁膜22を含む。
次に、図9から図11を参照して、半導体装置100の製造方法の一例を説明する。なお、半導体装置100の製造方法のうち、図9(a)から図10(g)までは薄膜キャパシタ構造50の製造方法を示す。また、図9(c)から図11(j)までは、図1とは上下関係を逆にして描いてある。また、図9から図11に示される製造工程の順序は、一例を示すものであり、これに限定されるものではない。
上記したように、本実施形態の薄膜キャパシタ構造50においては、第1絶縁膜21から薄膜キャパシタ10を経由して第2絶縁膜22まで貫通し、LSIチップ2の複数の電極パッド(3G、3P、3S)に対応する位置に形成された複数の貫通孔(30G、30P、30S)が設けられている。そのため、薄膜キャパシタ構造50、言い換えれば、薄膜キャパシタ10をLSIチップ2(エリアアレイ型集積回路)に接合する際に、複数の貫通孔(30G、30P、30S)に、例えば、本実施形態のように、銅ペーストの導電部材4を電極パッド3に達するまで充填することによって、薄膜キャパシタ10をLSIチップ2に接合することができる。それにより、薄膜キャパシタ10の上部に端子アレーを形成したり、あるいはLSIチップ2の電極パッド3に接続バンプを形成したりする必要がない。また、薄膜キャパシタ10をLSIチップ2の電極パッド面2Sにほぼ最短距離で結合することができる。その結果、薄膜キャパシタ10とLSIチップ2(集積回路)との接続構成を簡略化できるとともに、薄膜キャパシタ10の配線に係るインピーダンスを低減できる。
その際、第1張り出し部11Cは十字状のグランドパッド用開口部11Bの形成に伴って形成され、また、第2張り出し部13Cは十字状の電源パッド用開口部13Bの形成に伴って形成される。そのため、第1張り出し部11C、および第2張り出し部13Cを、簡易な方法で形成できる。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
インターポーザ基板60を含む構成の場合、LSIチップ2とインターポーザ基板60との接続に関して、図15に示されるように、銅ぺースト4等を介して先にLSIチップ2に薄膜キャパシタ構造50を接続したものを、熱圧着によってインターポーザ基板60に接続するようにする。あるいは、図16に示されるように、銅ぺースト4等を介して先にインターポーザ基板60に薄膜キャパシタ構造50を接続したものを、熱圧着によってLSIチップ2に接続するようにしてもよい。
Claims (7)
- 電極パッド面に複数の電極パッドがエリアアレイ状に配置されたエリアアレイ型集積回路の前記電極パッド面に接合される薄膜キャパシタ構造であって、前記複数の電極パッドは、電源パッド、グランドパッド、および信号パッドと、を含み、
当該薄膜キャパシタ構造は、
第1シート電極、第2シート電極、および前記第1シート電極と前記第2シート電極との間に形成された薄膜誘電体層を含む薄膜キャパシタと、
前記第1シート電極を絶縁する第1絶縁膜と、
前記第2シート電極を絶縁する第2絶縁膜と、
前記第1絶縁膜から前記薄膜キャパシタを経由して前記第2絶縁膜まで貫通し、前記複数の電極パッドに対応する位置に形成された複数の貫通孔であって、前記電源パッドに対応する位置に形成された電源用貫通孔、前記グランドパッドに対応する位置に形成されたグランド用貫通孔、および、前記信号パッドに対応する位置に形成された信号用貫通孔を含む複数の貫通孔と、を備える薄膜キャパシタ構造。 - 請求項1に記載の薄膜キャパシタ構造において、
前記第1シート電極は、
前記グランド用貫通孔内に張り出す第1張り出し部と、
前記電源パッドおよび前記信号パッドに対応した位置に形成された第1開口部と、
前記グランドパッドに対応した位置に形成され、周辺に前記第1張り出し部を形成する平面形状を有するグランドパッド用開口部と、を含み、
前記第2シート電極は、
前記電源用貫通孔内に張り出す第2張り出し部と、
前記グランドパッドおよび前記信号パッドに対応した位置に形成された第2開口部と、
前記電源パッドに対応した位置に形成され、周辺に前記第2張り出し部を形成する平面形状を有する電源パッド用開口部と、含む、
薄膜キャパシタ構造。 - 請求項2に記載の薄膜キャパシタ構造において、
前記薄膜誘電体層は、前記複数の電極パッドに対応した位置に形成され、前記第1開口部および前記第2開口部の開口面積より小さい開口面積を有する誘電体開口部を含み、
前記第1絶縁膜は、前記複数の電極パッドに対応した位置に形成され第1絶縁膜開口部を含み、
前記第2絶縁膜は、前記複数の電極パッドに対応した位置に形成され第2絶縁膜開口部を含み、
前記電源用貫通孔は、第1絶縁膜開口部、前記誘電体開口部、前記電源パッド用開口部、および前記第2絶縁膜開口部によって構成され、
前記グランド用貫通孔は、第1絶縁膜開口部、前記グランドパッド用開口部、および前記第2絶縁膜開口部によって構成され、
前記信号用貫通孔は、第1絶縁膜開口部、前記誘電体開口部、および前記第2絶縁膜開口部によって構成される、薄膜キャパシタ構造。 - 請求項3に記載の薄膜キャパシタ構造において、
前記第1開口部、前記第2開口部、および前記誘電体開口部は、平面視において正方形の形状を有し、
前記電源パッド用開口部および前記グランドパッド用開口部は、平面視において十字状の形状を有する、薄膜キャパシタ構造。 - エリアアレイ型集積回路と、
請求項1から請求項4の何れか一項に記載の薄膜キャパシタ構造であって、前記エリアアレイ型集積回路の電極パッド面に接合された薄膜キャパシタ構造と、
前記電源用貫通孔、前記グランド用貫通孔,および前記信号用貫通孔に、前記複数の電極パッドに達するまで充填された導電材料と、を備えた半導体装置。 - 請求項5に記載された半導体装置において、
前記導電材料に対して前記電極パッド側とは反対側には、外部接続用の接続パッドが設けられている、半導体装置。 - 請求項5に記載された半導体装置において、
前記薄膜キャパシタ構造に対して前記電極パッド面側とは反対側に設けられた中間基板であって、前記複数の電極パッドに対応した位置に複数の中間基板パッドを有する中間基板を備える、半導体装置。
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