JP7202785B2 - 配線基板及び配線基板の製造方法 - Google Patents
配線基板及び配線基板の製造方法 Download PDFInfo
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- JP7202785B2 JP7202785B2 JP2018087609A JP2018087609A JP7202785B2 JP 7202785 B2 JP7202785 B2 JP 7202785B2 JP 2018087609 A JP2018087609 A JP 2018087609A JP 2018087609 A JP2018087609 A JP 2018087609A JP 7202785 B2 JP7202785 B2 JP 7202785B2
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- insulating
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Description
以下、図1~図7に従って第1実施形態を説明する。
図1に示すように、配線基板10は、複数の配線層と複数の絶縁層とが交互に積層された積層体20と、積層体20の側面20S全面及び下面を被覆する絶縁層40とを有している。
配線層23は、絶縁層22の下面22Bに積層されている。配線層23は、配線層21と電気的に接続されている。配線層23は、例えば、貫通孔22Y内に充填されたビア配線と、絶縁層22の下面22Bに形成された配線パターンとが一体に形成された構造を有している。
半導体装置11は、配線基板50と、中間基板(インターポーザ)として機能する配線基板10と、半導体チップ60とを有している。
次いで、支持基板200を除去する。例えば、支持基板200の支持体銅箔を極薄銅箔から機械的に剥離する。このとき、支持体銅箔と極薄銅箔との間には剥離層が介在されており、支持体銅箔と極薄銅箔との間の接着力は弱いため、支持体銅箔を極薄銅箔から容易に剥離することができる。その後、金属膜201上に残った極薄銅箔を、例えば、塩化第二鉄水溶液、塩化第二銅水溶液や過硫酸アンモニウム水溶液等を用いたウェットエッチングにより除去する。このとき、金属膜201は、支持基板200の極薄銅箔をエッチングする際のストッパ層として機能する。
次に、半導体装置11の製造方法について説明する。
(1)積層体20内の絶縁層22,24,26,28よりも剛性の高い絶縁層40によって、積層体20の側面20S全面及び下面を被覆するようにした。これにより、積層体20のみの構造に比べて、配線基板10における剛性を向上させることができる。このため、製造過程において支持基板200を除去した後であっても、配線基板10に反りや撓みが発生することを抑制できる。この結果、製造工程における配線基板10のハンドリング性を向上させることができる。
以下、図8~図18に従って第2実施形態を説明する。先の図1~図7に示した部材と同一の部材にはそれぞれ同一の符号を付して示し、それら各要素についての詳細な説明は省略する。
配線基板12は、配線基板10と、その配線基板10が埋め込まれた(内蔵された)配線基板70とを有している。配線基板70は、例えば、配線基板10(積層体20)よりも配線密度の低い配線層が形成された低密度配線層である。
絶縁層81は、絶縁層71の下面71Bに、配線層72を被覆するように形成されている。絶縁層81には、所要の箇所に、当該絶縁層81を厚さ方向に貫通して配線層72の下面の一部を露出する貫通孔81Xが形成されている。
半導体装置13は、配線基板12と、半導体チップ60と、外部接続端子86とを有している。
次いで、支持基板200を除去し、金属膜201をエッチングにより除去する。本工程により、図11(b)に示すように、配線層21の上面21Aと絶縁層22の上面22Aと絶縁層40の上面40Aとが外部に露出される。
続いて、支持基板210を除去する。例えば、まず、剥離層212の粘着力を低下させるために、紫外線の照射(剥離層212が紫外線剥離型接着剤の場合)、加熱(剥離層212が熱剥離型接着剤の場合)又はレーザ光の照射(剥離層212がレーザ剥離型接着剤の場合)を行う。続いて、剥離層212及び支持体211を絶縁層71から機械的に剥離する。これにより、図17に示すように、絶縁層71の上面71Aと絶縁層40の上面40Aと絶縁層22の上面22Aと配線層21の上面21Aとが外部に露出される。このとき、支持基板210の除去前に剥離層212の下面212B(図16参照)と接していた、絶縁層71の上面71Aと絶縁層40の上面40Aと絶縁層22の上面22Aと配線層21の上面21Aとは、剥離層212の下面212B(平坦面)に沿った形状に形成される。このため、絶縁層71の上面71Aと絶縁層40の上面40Aと絶縁層22の上面22Aと配線層21の上面21Aとは略面一に形成される。
以上説明した実施形態によれば、第1実施形態の(1)~(6)の作用効果に加えて、以下の作用効果を奏することができる。
以下、図19~図25に従って第3実施形態を説明する。先の図1~図18に示した部材と同一の部材にはそれぞれ同一の符号を付して示し、それら各要素についての詳細な説明は省略する。
配線基板14は、積層体20と、積層体20の側面20S全面及び下面を被覆する絶縁層41と、絶縁層41の下面41Bに積層された配線構造90と、配線構造90の下面に形成されたソルダーレジスト層96とを有している。
配線構造90は、絶縁層41の下面41Bに積層された配線構造である。配線構造90は、例えば、積層体20よりも配線密度の低い配線層が形成された低密度配線層である。
ここで、絶縁層92,94の材料としては、熱硬化性樹脂を主成分とする非感光性の絶縁性樹脂を用いることができる。絶縁層92,94の材料としては、例えば、エポキシ樹脂やポリイミド樹脂などの熱硬化性樹脂、又はこれら樹脂にシリカやアルミナ等のフィラーを混入した樹脂材を用いることができる。絶縁層92,94の材料としては、例えば、熱硬化性樹脂に対して補強材を入れた絶縁性樹脂を用いることもできる。本例では、絶縁層92,94のうちの絶縁層94を、補強材入りの絶縁性樹脂で構成した。例えば、本例の絶縁層94は、補強材として所要数(ここでは、1個)のガラスクロス94Gを有している。また、配線層91,93,95の材料としては、例えば、銅や銅合金を用いることができる。
半導体装置15は、配線基板14と、半導体チップ60と、外部接続端子86とを有している。
続いて、支持基板200を除去し、金属膜201をエッチングにより除去する。本工程により、図24に示すように、配線層21の上面21Aと絶縁層22の上面22Aと絶縁層41の上面41Aとが外部に露出される。このとき、金属膜201の下面201B(図23参照)と接していた、配線層21の上面21Aと絶縁層22の上面22Aと絶縁層41の上面41Aとは、金属膜201の下面201B(平坦面)に沿った形状に形成される。このため、配線層21の上面21Aと絶縁層22の上面22Aと絶縁層41の上面41Aとが略面一に形成される。
以上説明した実施形態によれば、第1実施形態の(1)~(6)及び第2実施形態の(7)の作用効果に加えて、以下の作用効果を奏することができる。
上記実施形態は、以下のように変更して実施することができる。上記実施形態及び以下の変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。
例えば図26に示すように、配線構造90を配線層91のみで構成するようにしてもよい。すなわち、図19に示した配線層93,95及び絶縁層92,94を省略してもよい。
・上記第2実施形態の配線基板70における配線層72,82,84及び絶縁層71,81,83の層数や取り回しなどは様々に変形・変更することが可能である。例えば、配線基板10の側面及び下面を被覆する絶縁層71を、複数層の絶縁層で構成してもよい。また、絶縁層71内に配線層を形成してもよい。例えば、積層体20の最上層の配線層21と同一平面上に形成された配線層を絶縁層71内に形成してもよい。この場合の配線層の上面は、例えば、絶縁層71の上面71Aと略面一に形成され、絶縁層71から外部に露出される。
・上記第2実施形態におけるソルダーレジスト層85を省略してもよい。
例えば図27に示すように、積層体20の側面20Sにおいて、積層体20内の全ての絶縁層22,24,26,28の側面を面一になるように形成してもよい。この場合には、絶縁層24が絶縁層22の下面22B全面を被覆するように形成され、絶縁層26が絶縁層24の下面24B全面を被覆するように形成され、絶縁層28が絶縁層26の下面26B全面を被覆するように形成される。
例えば図28に示すように、接続端子29Pの平面形状を、ビア配線29Vの平面形状と同じ大きさになるように形成してもよい。例えば、接続端子29Pの平面形状を、ビア配線29Vの下面の平面形状と同じ大きさになるように形成してもよい。また、接続端子29Pの平面形状を、ビア配線29Vの下面の平面形状よりも小さくなるように形成してもよい。
・上記第1実施形態では、配線基板50にバンプ54を介して配線基板10を搭載するようにしたが、配線基板50に対する配線基板10の搭載方法はこれに限定されない。
配線層115は、配線層113と電気的に接続されている。配線層115は、絶縁層114を厚さ方向に貫通するビア配線と、絶縁層114の上面に形成された配線パターンとが一体に形成された構造を有している。
・上記各実施形態では、支持基板200の片側(下面)に配線層及び絶縁層を積層して配線基板10,14を形成し、支持基板200を除去して1つの個別領域A1から1つの配線基板10,14を得るようにした。これに限らず、例えば、支持基板200の両側(上面及び下面)にそれぞれ配線層及び絶縁層を積層して配線基板10,14を形成し、支持基板200を除去して1つの個別領域A1から複数の配線基板10,14を得るようにしてもよい。
11,13,15 半導体装置
20 積層体
21 配線層(最上層の配線層)
23,25,27 配線層
29 配線層(最下層の配線層)
22,24,26,28 絶縁層
40,41 絶縁層(第1絶縁層)
41X 貫通孔
71 絶縁層(第2絶縁層)
71X 凹部
71Y 貫通孔
72V,91V ビア配線
72P,91P 配線パターン
80,90 配線構造
81,83,92,94 絶縁層
82,84,91,93,95 配線層
200 支持基板(第1支持基板)
201 金属膜(第1支持基板)
210 支持基板(第2支持基板)
Claims (15)
- 感光性樹脂を主成分とする絶縁性樹脂からなる複数の絶縁層と複数の配線層とが交互に積層された積層体と、
前記複数の絶縁層よりも剛性が高く、前記積層体の側面全面及び下面を被覆する第1絶縁層と、を有し、
前記積層体の最上層の配線層の上面と前記積層体の最上層の絶縁層の上面とが前記第1絶縁層から露出されており、
前記積層体の最下層の配線層は、前記積層体の最下層の絶縁層を貫通する第1ビア配線と、前記第1ビア配線と一体に形成され、前記最下層の絶縁層の下面から下方に突出する金属ポストとを有し、
前記第1絶縁層は、前記金属ポストの側面全面に接して被覆していることを特徴とする配線基板。 - 前記第1絶縁層の上面は、前記最上層の配線層の上面及び前記最上層の絶縁層の上面と面一になるように形成されていることを特徴とする請求項1に記載の配線基板。
- 前記複数の絶縁層は、上下に隣接する上層絶縁層及び下層絶縁層を有し、
前記下層絶縁層は、前記上層絶縁層の下面に積層され、前記上層絶縁層の下面の外周部を露出するように形成されており、
前記第1絶縁層は、前記上層絶縁層の側面全面と、前記下層絶縁層から露出する前記上層絶縁層の下面全面と、前記下層絶縁層の側面全面とを被覆するように形成されていることを特徴とする請求項1又は2に記載の配線基板。 - 前記最下層の配線層の下面が前記第1絶縁層から露出されており、
前記最下層の配線層は、前記積層体内の他の配線層よりも厚く形成されていることを特徴とする請求項1~3のいずれか一項に記載の配線基板。 - 前記最上層の配線層の上面は、前記第1絶縁層の上面と面一になるように形成されており、
前記最下層の配線層の下面は、前記第1絶縁層の下面と面一になるように形成されていることを特徴とする請求項1~4のいずれか一項に記載の配線基板。 - 前記積層体及び前記第1絶縁層を有する構造体が埋め込まれた凹部を有する第2絶縁層と、
前記第2絶縁層の下面に形成され、前記凹部に埋め込まれた前記構造体の前記最下層の配線層の下面の一部を露出するように前記第2絶縁層を厚さ方向に貫通する貫通孔と、
前記第2絶縁層の下面に形成され、前記貫通孔を充填する第2ビア配線を介して前記最下層の配線層と電気的に接続される配線パターンと、を有することを特徴とする請求項1~5のいずれか一項に記載の配線基板。 - 前記第2絶縁層の下面に積層され、熱硬化性樹脂を主成分とする絶縁性樹脂からなる絶縁層と配線層とが積層されてなる配線構造を有することを特徴とする請求項6に記載の配線基板。
- 前記凹部の内側面は、前記第1絶縁層の外側面と密着するように形成され、
前記凹部の底面は、前記第1絶縁層の下面と密着するように形成されていることを特徴とする請求項6又は7に記載の配線基板。 - 前記第2絶縁層は、前記第1絶縁層と同種の樹脂材料により構成されていることを特徴とする請求項6~8のいずれか一項に記載の配線基板。
- 前記第1絶縁層は、前記最下層の配線層の下面を被覆するように形成され、
前記第1絶縁層の下面には、前記最下層の配線層の下面の一部を露出する貫通孔が形成されており、
前記第1絶縁層の下面に形成され、前記貫通孔を充填する第3ビア配線を介して前記最下層の配線層に電気的に接続される配線パターンを有することを特徴とする請求項1~4のいずれか一項に記載の配線基板。 - 前記第1絶縁層の下面に積層され、前記配線パターンを含む複数の配線層と熱硬化性樹脂を主成分とする絶縁性樹脂からなる複数の絶縁層とが交互に積層されてなる配線構造を有することを特徴とする請求項10に記載の配線基板。
- 第1支持基板を準備する工程と、
前記第1支持基板上に、感光性樹脂を主成分とする絶縁性樹脂からなる複数の絶縁層と複数の配線層とを交互に積層して積層体を形成する工程と、
前記第1支持基板上に、前記積層体の側面全面及び下面を被覆する第1絶縁層を形成する工程と、
前記第1支持基板を除去し、前記積層体の最上層の配線層の上面と前記積層体の最上層の絶縁層の上面と前記第1絶縁層の上面とを露出する工程と、を有し、
前記積層体を形成する工程では、前記積層体の最下層の配線層が、前記積層体の最下層の絶縁層を貫通する第1ビア配線と、前記第1ビア配線と一体に形成され、前記最下層の絶縁層の下面から下方に突出する金属ポストとを有するように形成され、
前記第1絶縁層を形成する工程では、前記第1絶縁層が、前記金属ポストの側面全面に接して被覆するように形成されることを特徴とする配線基板の製造方法。 - 前記第1支持基板は、前記配線基板が形成される個別領域を複数有し、
前記積層体は、前記各個別領域における前記第1支持基板上に形成され、
前記第1絶縁層は、前記積層体の側面全面及び下面を被覆するとともに、隣り合う前記積層体の間の空間を充填するように形成されることを特徴とする請求項12に記載の配線基板の製造方法。 - 前記第1支持基板を除去した後の前記積層体及び前記第1絶縁層を、前記第1支持基板とは異なる第2支持基板上に搭載する工程と、
前記第2支持基板上に、前記第1絶縁層の側面全面及び下面を被覆する第2絶縁層を形成する工程と、
前記第2絶縁層の下面に、前記最下層の配線層の下面を露出する貫通孔を形成する工程と、
前記貫通孔を充填する第2ビア配線と、前記第2ビア配線を介して前記最下層の配線層と電気的に接続され、前記第2絶縁層の下面に形成された配線パターンとを形成する工程と、
前記第2支持基板を除去する工程と、
を有することを特徴とする請求項12又は13に記載の配線基板の製造方法。 - 前記第1支持基板を除去する工程の前に、
前記第1絶縁層の下面に、前記最下層の配線層の下面の一部を露出する貫通孔を形成する工程と、
前記貫通孔を充填する第3ビア配線と、前記第3ビア配線を介して前記最下層の配線層と電気的に接続され、前記第1絶縁層の下面に形成された配線パターンとを形成する工程と、を有することを特徴とする請求項12又は13に記載の配線基板の製造方法。
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