JP6625491B2 - 配線基板、半導体装置、配線基板の製造方法 - Google Patents
配線基板、半導体装置、配線基板の製造方法 Download PDFInfo
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- JP6625491B2 JP6625491B2 JP2016129022A JP2016129022A JP6625491B2 JP 6625491 B2 JP6625491 B2 JP 6625491B2 JP 2016129022 A JP2016129022 A JP 2016129022A JP 2016129022 A JP2016129022 A JP 2016129022A JP 6625491 B2 JP6625491 B2 JP 6625491B2
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- wiring
- layer
- connection terminal
- metal foil
- insulating layer
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Description
以下、第1実施形態を図1〜図8に従って説明する。
図2(a)に示すように、半導体装置1は、配線基板10と、配線基板10に実装された複数(図2(a)では2つ)の半導体素子60,70とを有している。配線基板10は、配線部品(ブリッジボード)20を有している。配線部品20は、平面視において、2つの半導体素子60,70の一部と重なるように配置されている。半導体素子60,70の一部の端子は、配線部品20に接続されている。配線部品20は、2つの半導体素子60,70の一部の端子を互いに接続する。
図1(a)に示すように、配線基板10は、配線部品20、外部端子41,42、配線層43,44、絶縁層51,52、ソルダレジスト層53を有している。
配線層23は、絶縁層31を厚み方向に貫通して外部端子21,22に接続されたビア配線と、ビア配線を介して外部端子21,22と接続され、絶縁層31の下面に形成された配線パターンと、を有している。配線パターンの厚さは、例えば2〜5μmとすることができる。配線パターンの幅は、例えば2〜5μmとすることができる。配線パターンの間隔は、例えば2〜5μmとすることができる。
配線層24は、絶縁層32の下面に形成されている。配線層24は、絶縁層32を厚み方向に貫通するビア配線と、そのビア配線を介して配線層23と接続され、絶縁層32の下面に形成された配線パターンとを有している。配線層24の大きさ(配線パターンの厚さ、配線幅、配線間隔)については、前述の配線層23と同様とすることができる。
配線層25は、絶縁層33の下面に形成されている。配線層25は、絶縁層33を厚み方向に貫通するビア配線と、そのビア配線を介して配線層24と接続され、絶縁層33の下面に形成された配線パターンとを有している。この配線層25において、絶縁層33の下面に形成された配線パターンは、内部接続端子IP1.IP2として機能する。内部接続端子IP1.IP2は、例えば円形状に形成され、その大きさは例えば40μmとすることができる。
絶縁層51,52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絶縁性樹脂、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。また、絶縁層51,52の材料としては、例えば、ガラス、アラミド、LCP(Liquid Crystal Polymer)繊維の織布や不織布などの補強材に、エポキシ樹脂やポリイミド樹脂等を主成分とする熱硬化性樹脂を含浸させた補強材入りの絶縁性樹脂を用いることもできる。なお、絶縁層51,52の材料としては、熱硬化性を有する絶縁性樹脂や感光性を有する絶縁性樹脂を用いることができる。
なお、説明の便宜上、最終的に配線基板10の各構成要素となる部分には、最終的な構成要素の符号を付して説明する場合がある。
図3(a)に示す工程では、支持体201の上面に、接着層202を介してキャリア付金属箔203(ピーラブル金属箔)が貼付された支持基板200(第2支持基板)を形成する。支持体201の厚さは、例えば0.5〜1ミリメートル(mm)とすることができる。支持体201としては、ガラスやステンレス等を用いることができる。接着層202は、耐熱性を有する、例えばエポキシ系の接着剤である。接着層202の厚さは、例えば10〜20μmとすることができる。
詳述すると、金属箔205の上面に、所望の位置に開口部を有するレジスト層を形成する。開口部は、外部端子21,22に対応する部分の支持体(金属箔205)を露出するように形成される。レジスト層の材料としては、感光性のドライフィルムレジスト又は液状のフォトレジスト(例えばノボラック系樹脂やアクリル系樹脂等のドライフィルムレジストや液状レジスト)等を用いることができる。例えば感光性のドライフィルムレジストを用いる場合には、金属箔205の上面にドライフィルムを熱圧着によりラミネートし、そのドライフィルムを露光・現像によりパターニングして、開口部を有するレジスト層を形成する。なお、液状のフォトレジストを用いる場合にも、同様の工程を経て、レジスト層を形成することができる。続いて、レジスト層をめっきマスクとして、金属箔205の上面に、金属箔205をめっき給電層に利用する電解めっき(電解金めっき)を施し、金属層21b、22bを形成する。さらに、電解めっき(電解ニッケルめっき)を施し、金属層21c、22cを形成する。そして、レジスト層を例えばアルカリ性の剥離液により除去する。
金属箔234の表面に、外部端子41,42を形成する位置に開口部を有するレジスト層を形成する。レジスト層は、耐めっき性を有する感光性のドライフィルムレジスト(例えば、ノボラック系樹脂やアクリル系樹脂等のドライフィルムレジスト)等を用いることができる。金属箔234の表面をドライフィルムによりラミネートし、そのドライフィルムをフォトリソグラフィ法によりパターニングして上記開口部を有するレジスト層を形成する。なお、液状のフォトレジスト(例えば、ノボラック系樹脂やアクリル系樹脂等の液状レジスト)を用いてレジスト層を形成してもよい。
先ず、外部端子41,42と構造体220(配線部品20)を覆う絶縁層51を形成する。次いで、絶縁層51を貫通し、外部端子41,42の面41b,42bの一部と、内部接続端子IP1.IP2の上面の一部を露出するビアホールを形成する。ビアホールは、例えばCO2レーザやYAGレーザ等によるレーザ加工法によって形成することができる。レーザ加工法によりビアホールを形成した場合、必要に応じてデスミア処理を行う。このとき、外部端子41,42の面41b,42bは、構造体220に含まれる配線部品20の下面20bとほぼ同一の平面上に位置する。このため、レーザ加工法により形成するビアホールによって、外部端子41,42の面41b,42bと、内部接続端子IP1.IP2の上面とを、ほぼ同じ処理時間にて容易に露出させることができる。
次いで、絶縁層52の上面に、開口部53Xを有するソルダレジスト層53を形成する。ソルダレジスト層53は、例えば、感光性のソルダレジストフィルムをラミネートし、又は液状のソルダレジストを塗布し、当該レジストをフォトリソグラフィ法により露光・現像して所要の形状にパターニングすることにより得られる。ソルダレジスト層53の開口部53Xにより、配線層44の一部が外部接続端子EP1として露出される。
図7(b)に示す工程では、図7(a)に示す金属箔234を、例えばエッチングにより除去する。この金属箔234に対するエッチング処理において、外部端子41,42の表面処理層41c、42cがエッチングストッパとして機能する。
図2(a)に示すように、半導体装置1は、配線基板10と、配線基板10の上面に実装された半導体素子60,70を有している。配線基板10は配線部品20を有し、配線部品20を介して半導体素子60,70が互いに接続される。
(1−1)配線基板10には、半導体素子60,70が実装される。配線基板10は、配線部品20を有している。配線部品20は、半導体素子60,70の一部の端子を互いに接続する。配線部品20は、半導体素子60の電極端子61が接続される外部端子21と、半導体素子70の電極端子71が接続される外部端子22とを有している。配線部品20は、外部端子21,22が配設された上面20aと反対側の下面20bに内部接続端子IP1,IP2を有している。配線基板10は、半導体素子60の電極端子62が接続される外部端子41と、半導体素子70の電極端子72が接続される外部端子42とを有している。配線基板10の絶縁層51は、配線部品20と外部端子41,42とを埋設する。絶縁層51の下面には、外部端子41,42と配線部品20の内部接続端子IP1,IP2とに接続された配線層43が形成されている。
以下、第2実施形態を図9〜図14に従って説明する。
なお、この実施形態において、上記実施形態と同じ構成部材については同じ符号を付してその説明を省略する場合がある。
配線部品20と外部端子41,42は、絶縁層101に埋設されている。絶縁層101は、配線部品20の上面20aと外部端子41,42の面41a,42aを露出するように形成されている。つまり、絶縁層101は、配線部品20の下面及び側面と、外部端子41,42の下面及び側面を覆うように形成されている。
図9(b)に示すように、配線部品20は、外部端子(パッド)21,22、配線層23,24,25、絶縁層31,32,33を有している。外部端子21は、複数(本実施形態では2つ)の金属層21b,21cにより形成されている。同様に、外部端子22は、複数(本実施形態では2つ)の金属層22b,22cにより形成されている。上面側、つまり絶縁層31の上面31aに露出する金属層21b、22bは、例えば金(Au)層である。埋設された金属層21c、22cは、例えばニッケル(Ni)層である。
なお、配線部品20の製造方法については前述の第1実施形態と同じであるため、説明及び図面を省略する。
先ず、外部端子41,42と構造体220(配線部品20)を覆う絶縁層101を形成する。次いで、絶縁層101を貫通し、外部端子41,42の面41b,42bの一部と、内部接続端子IP1.IP2の上面の一部を露出するビアホールを形成する。ビアホールは、例えばCO2レーザやYAGレーザ等によるレーザ加工法によって形成することができる。レーザ加工法によりビアホールを形成した場合、必要に応じてデスミア処理を行う。このとき、外部端子41,42の面41b,42bは、構造体220に含まれる配線部品20の内部接続端子IP1.IP2の上面とほぼ同一の平面上に位置する。このため、レーザ加工法により形成するビアホールによって、外部端子41,42の面41b,42bと、内部接続端子IP1.IP2の上面とを、ほぼ同じ処理時間にて容易に露出させることができる。
次いで、絶縁層52の上面に、開口部53Xを有するソルダレジスト層53を形成する。ソルダレジスト層53は、例えば、感光性のソルダレジストフィルムをラミネートし、又は液状のソルダレジストを塗布し、当該レジストをフォトリソグラフィ法により露光・現像して所要の形状にパターニングすることにより得られる。ソルダレジスト層53の開口部53Xにより、配線層44の一部が外部接続端子EP1として露出される。
図13(b)に示す工程では、図13(a)に示す金属箔234と補助層241,242とを、例えばエッチングにより除去する。この金属箔234と補助層241,242に対するエッチング処理において、外部端子41,42の表面処理層41c、42cがエッチングストッパとして機能する。
(2−1)キャリア付金属箔232の金属箔234の上面234aに、接着剤55によって、配線部品20を含む構造体220を、その配線部品20の外部端子21,22が形成された面を覆う金属箔205を、金属箔234の上面234aに向けて接着する。そして、金属箔234の上面234aに補助層241,242を形成し、その補助層241,242に対して外部端子41,42を積層して形成するようにした。この結果、補助層241,242により、外部端子41,42の面41a,42aと、配線部品20の外部端子21,22の面21a,22aとを同一の平面上に位置するように形成することができる。
補助層241,242は、外部端子41,42を形成するレジスト層を用いて、外部端子41,42に先立って、例えば電解めっき法により形成される。このため、前述した第1実施形態のように、搭載凹部234bを形成するエッチング工程が不要となり、工程間の移動等に要する時間がかからない。このため、配線基板10aの製造に要する時間の短縮を図ることができる。
・上記実施形態では、図3(a)に示すように、支持体201の上面にキャリア付金属箔203を貼付して配線部品20(図4(d)参照)を製造するようにした。これに限らず、例えば、図3(a)に示す支持体201の上下両面にキャリア付金属箔203を貼付して複数の配線部品20を製造するようにしてもよい。
10,10a 配線基板
20 配線部品
21,22 接続端子
21a,22a 上面
41,42 接続端子
41a,42a 上面
51,101 絶縁層
43 配線層
60,70 半導体素子
61,62,71,72 電極端子
IP1,IP2 内部接続端子
Claims (7)
- それぞれ第1電極端子と第2電極端子を有する第1半導体素子と第2半導体素子が実装される配線基板であって、
上面に前記第1半導体素子の第1電極端子が接続される第1接続端子と前記第2半導体素子の第1電極端子が接続される第2接続端子とが露出して形成され、下面に内部接続端子が形成された配線部品と、
前記第1半導体素子の第2電極端子が接続される第3接続端子と、
前記第2半導体素子の第2電極端子が接続される第4接続端子と、
前記配線部品と前記第3接続端子と前記第4接続端子とが埋設された絶縁層と、
前記絶縁層の下面に形成され、前記絶縁層を貫通するビア配線を有し、前記ビア配線により前記内部接続端子に直接接続された配線層と、を有し、
前記第1〜前記第4接続端子の上面は同一の平面上に位置しており、
前記絶縁層は、前記配線部品の外周側面から前記絶縁層の上面側に向かうにつれて拡開するテーパ状の開口部を有し、
前記開口部と前記配線部品の間に配設され、前記配線部品の側面の一部を覆う接着剤を備えていること、を特徴とする配線基板。 - 前記第3接続端子と前記第4接続端子は前記絶縁層の厚さ方向に延びる柱状に形成され、前記絶縁層の厚さ方向において前記第3接続端子及び前記第4接続端子の長さは、前記配線部品の前記上面から前記下面までの厚さと等しくなるように設定されていること、を特徴とする請求項1に記載の配線基板。
- 配線基板と、それぞれ第1電極端子と第2電極端子を有して前記配線基板に実装された第1半導体素子と第2半導体素子とを有し、
前記配線基板は、
上面に前記第1半導体素子の第1電極端子が接続される第1接続端子と前記第2半導体素子の第1電極端子が接続される第2接続端子とが露出して形成され、下面に内部接続端子が形成された配線部品と、
前記第1半導体素子の第2電極端子が接続される第3接続端子と、
前記第2半導体素子の第2電極端子が接続される第4接続端子と、
前記配線部品と前記第3接続端子と前記第4接続端子とが埋設された絶縁層と、
前記絶縁層の下面に形成され、前記絶縁層を貫通するビア配線を有し、前記ビア配線により前記内部接続端子に直接接続された配線層と、を有し、
前記第1〜前記第4接続端子の上面は同一の平面上に位置しており、
前記絶縁層は、前記配線部品の外周側面から前記絶縁層の上面側に向かうにつれて拡開するテーパ状の開口部を有し、
前記開口部と前記配線部品の間に配設され、前記配線部品の側面の一部を覆う接着剤を備えていること、を特徴とする半導体装置。 - それぞれ第1電極端子と第2電極端子を有する第1半導体素子と第2半導体素子が実装される配線基板の製造方法であって、
第1の面に前記第1半導体素子の第1電極端子が接続される第1接続端子と前記第2半導体素子の第1電極端子が接続される第2接続端子とが露出して形成され、前記第1の面とは反対側の第2の面に内部接続端子が形成された配線部品と、前記第1の面を覆う金属箔とを有する構造体を形成する工程と、
第1支持基板の上面に搭載凹部を形成する工程と、
前記金属箔の上面を前記第1支持基板の上面と同一高さとするように、前記搭載凹部に前記構造体の前記金属箔を埋設して接着層により前記構造体を接着する工程と、
前記第1支持基板の上面に第3接続端子と第4接続端子とを形成する工程と、
前記構造体と前記第3接続端子と前記第4接続端子とを覆う絶縁層を形成する工程と、
前記絶縁層の上面に、前記内部接続端子と前記第3接続端子と前記第4接続端子とにそれぞれ接続された配線層を形成する工程と、
前記第1支持基板を除去する工程と、
前記金属箔を覆う前記接着層を除去する工程と、
前記構造体の前記金属箔を除去する工程と、
を有する配線基板の製造方法。 - それぞれ第1電極端子と第2電極端子を有する第1半導体素子と第2半導体素子が実装される配線基板の製造方法であって、
第1の面に前記第1半導体素子の第1電極端子が接続される第1接続端子と前記第2半導体素子の第1電極端子が接続される第2接続端子とが露出して形成され、前記第1の面とは反対側の第2の面に内部接続端子が形成された配線部品と、前記第1の面を覆う金属箔とを有する構造体を形成する工程と、
第1支持基板の上面に、前記構造体の前記金属箔を接着層により接着する工程と、
前記第1支持基板の上面に、前記金属箔の上面と同一の高さの補助層を形成する工程と、
前記補助層の上に第3接続端子と第4接続端子とを形成する工程と、
前記構造体と前記第3接続端子と前記第4接続端子とを覆う絶縁層を形成する工程と、
前記絶縁層の上面に、前記内部接続端子と前記第3接続端子と前記第4接続端子とにそれぞれ接続された配線層を形成する工程と、
前記第1支持基板及び前記補助層を除去する工程と、
前記金属箔を覆う前記接着層を除去する工程と、
前記構造体の前記金属箔を除去する工程と、
を有する配線基板の製造方法。 - 前記第1支持基板は、支持体と、前記支持体の上面に接着されたキャリア板と、前記キャリア板の上面に剥離層を介して積層された金属箔とを含み、
前記第1支持基板を除去する工程では、前記キャリア板を前記金属箔から剥離して前記支持体と前記キャリア板とを除去した後、前記金属箔をエッチングにより除去すること、を特徴とする請求項4又は5に記載の配線基板の製造方法。 - 前記構造体を形成する工程は、
キャリア板と、前記キャリア板の上面に剥離層を介して積層された金属箔とを含む第2支持基板を用い、前記金属箔の上面に第1接続端子と第2接続端子とを形成する工程と、
前記金属箔の上面側に、絶縁層と配線層とを交互に積層する工程と、
最上層の前記配線層をパターニングして内部接続端子を形成する工程と、
最上層の前記絶縁層の上面に第1支持層を形成する工程と、
前記キャリア板を前記金属箔から剥離する工程と、
前記金属箔の下面に第2支持層を形成した後、前記第1支持層を除去する工程と、
を有し、
前記金属箔から前記第2支持層を除去して前記構造体を前記第1支持基板に接着すること、を特徴とする請求項4〜6のいずれか1項に記載の配線基板の製造方法。
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