JP6543559B2 - 配線基板、半導体装置及び配線基板の製造方法 - Google Patents
配線基板、半導体装置及び配線基板の製造方法 Download PDFInfo
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- JP6543559B2 JP6543559B2 JP2015225875A JP2015225875A JP6543559B2 JP 6543559 B2 JP6543559 B2 JP 6543559B2 JP 2015225875 A JP2015225875 A JP 2015225875A JP 2015225875 A JP2015225875 A JP 2015225875A JP 6543559 B2 JP6543559 B2 JP 6543559B2
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- layer
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- insulating layer
- protective insulating
- wiring
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
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Description
なお、添付図面は、便宜上、特徴を分かりやすくするために特徴となる部分を拡大して示している場合があり、各構成要素の寸法比率などが実際と同じであるとは限らない。また、断面図では、各部材の断面構造を分かりやすくするために、一部の部材のハッチングを梨地模様に代えて示し、一部の部材のハッチングを省略している。
図1(a)に示すように、配線基板10は、配線基板10の厚さ方向の中心付近に設けられた基板本体20を有している。基板本体20は、コア基板21と、コア基板21を厚さ方向に貫通する貫通孔21Xに形成された貫通電極22と、コア基板21の上面及び下面にそれぞれ積層され、貫通電極22を介して互いに電気的に接続された配線23,24とを有している。また、基板本体20は、配線23を被覆するようにコア基板21の上面に形成された絶縁層25と、配線24を被覆するようにコア基板21の下面に形成された絶縁層26とを有している。
配線層50は、貫通孔42Xの内面(つまり、貫通孔42Xの内側面及び貫通孔42Xの底部に露出する配線層40の上面)と、絶縁層42の上面42Aとを連続的に被覆するシード層60を有している。本例のシード層60は、貫通孔42Xの内面と絶縁層42の上面42Aとを連続的に被覆する金属膜61と、その金属膜61の上面を被覆する金属膜62とが順に積層された2層構造のシード層である。金属膜61は、例えば、その側面が接続端子52及び金属膜62の側面よりも外側に突出するように形成されている。すなわち、平面視において、金属膜61の外形が、接続端子52や金属膜62の外形よりも大きく形成されている。
金属層81は、保護絶縁層70から露出された接続端子52の側面全面及び上面全面を被覆するとともに、保護絶縁層70における傾斜部73と頂部72と傾斜部74の一部とを被覆するように形成されている。金属層81は、例えば、凹部70Xを充填するように形成されている。
図2(a)に示すように、半導体装置90は、配線基板10と、1つ又は複数(ここでは、1つ)の半導体チップ91と、アンダーフィル材95と、外部接続端子96とを有している。
まず、図13に従って、比較例の配線基板200について説明する。
図13(a)に示すように、配線基板200は、配線層201を被覆する絶縁層202と、絶縁層202を厚さ方向に貫通するビア配線203と、そのビア配線203を介して配線層201と電気的に接続され、絶縁層202の上面202Aから上方に突出する接続端子204とを有している。配線基板200は、接続端子204の側面の一部を被覆するように絶縁層202の上面202Aに形成された保護絶縁層205と、保護絶縁層205から露出された接続端子204の表面を被覆する表面処理層206とを有している。保護絶縁層205の上面は、下層の絶縁層202の上面202Aと略平行になるように平坦に形成されている。接続端子204の側面を被覆する表面処理層206は、保護絶縁層205の上面に対して略垂直に延びるように形成されている。このとき、図13(b)に示すように、配線基板200では、表面処理層206と保護絶縁層205との密着性が悪いため、表面処理層206の下面と保護絶縁層205の上面との間に隙間S1が形成されている。
図3(a)に示すように、まず、配線層50、保護絶縁層70及び表面処理層80が形成される前段階の配線基板10を準備する。この配線基板10は、公知の製造方法により製造することが可能であるため、その概略について図3(a)を参照しながら説明する。
次に、図10に従って、半導体装置90の製造方法について説明する。
図10(a)に示す工程では、配線基板10の外部接続用パッドP1上に外部接続端子96を形成する。例えば、外部接続用パッドP1上に、適宜フラックスを塗布した後、外部接続端子96(ここでは、はんだボール)を搭載し、240〜260℃程度の温度でリフロー処理を行って固定する。その後、表面を洗浄してフラックスを除去する。
以上の製造工程により、図2に示した半導体装置90を製造することができる。
(1)各接続端子52の周囲に位置する保護絶縁層70の上面に、山なりに盛り上がる山部71を形成した。また、保護絶縁層70から露出された接続端子52の表面を被覆する表面処理層80を、山部71の傾斜部73と頂部72と傾斜部74の一部とを被覆するように形成した。このため、表面処理層80の下面は、表面処理層80の最外縁部から山部71の頂部72に向かって上方に傾斜するように形成されている。これにより、表面処理層80の下面と保護絶縁層70の上面との間に隙間が形成された場合であっても、フリップチップ接続の際に、溶融状態のはんだ層93が上記隙間に侵入することを好適に抑制できる。このため、はんだ層93と接続端子52との間でエレクトロマイグレーションが発生することを好適に抑制できる。この結果、はんだ層93と接続端子52及び表面処理層80との接続信頼性を向上させることができる。ひいては、配線基板10と半導体チップ91との接続信頼性を向上させることができる。
なお、上記実施形態は、これを適宜変更した以下の態様にて実施することもできる。
・図11に示す製造工程により半導体装置90を製造するようにしてもよい。なお、図11は、図10に示した工程の代わりに実施される。以下、上記実施形態との相違点を中心に説明する。
・上記実施形態及び上記各変形例において、金属膜61の側面を粗化面に形成してもよい。
40 配線層
42 絶縁層
42X 貫通孔
50 配線層
51 ビア配線
52 接続端子
52S 低粗度面
60 シード層
61,62 金属膜
70 保護絶縁層
70X 凹部
70Y 凹部
71 山部
72 頂部
73 傾斜部(第1傾斜部)
74 傾斜部(第2傾斜部)
75 突起部
77 凹凸部
80 表面処理層
81〜83 金属層
90 半導体装置
91 半導体チップ(電子部品)
92 接続端子
93 はんだ層
101 感光性樹脂層(保護絶縁層)
Claims (10)
- 絶縁層と、
前記絶縁層の上面から上方に突出して形成され、電子部品と接続される柱状の接続端子と、
前記接続端子の側面の一部を被覆するように前記絶縁層の上面に形成された保護絶縁層と、
前記保護絶縁層から露出された前記接続端子の上面及び側面を被覆する表面処理層と、を有し、
前記保護絶縁層の上面には、前記接続端子の周囲に、山なりに盛り上がる山部が形成され、
前記山部は、頂部と、前記頂部から該頂部に近接する前記接続端子に向かって下方に傾斜する第1傾斜部と、前記頂部から、該頂部に近接する前記接続端子から離間する方向に向かって下方に傾斜する第2傾斜部とを有し、
前記表面処理層は、前記第1傾斜部と前記頂部と前記第2傾斜部の一部とを被覆するように形成されていることを特徴とする配線基板。 - 前記表面処理層の下端部は、前記第2傾斜部の傾斜に沿って外側に広が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。
- 前記保護絶縁層に被覆された前記接続端子の側面の表面粗度は、前記保護絶縁層から露出された前記接続端子の側面及び上面の表面粗度よりも大きく設定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。
- 前記表面処理層は、複数の金属層が積層された構造を有し、
前記複数の金属層のうち1層の金属層は、ニッケルを含む金属材料からなるニッケル層であり、
前記ニッケル層は、前記第1傾斜部と前記頂部と前記第2傾斜部の一部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1〜3のいずれか一項に記載の配線基板。 - 前記絶縁層に被覆された配線層と、
前記絶縁層を厚さ方向に貫通して前記配線層の上面を露出する貫通孔と、
前記貫通孔に露出する前記配線層の上面と前記貫通孔の内側面と前記絶縁層の上面とを連続して被覆する金属膜と、
前記金属膜よりも内側の前記貫通孔を充填するビア配線と、を有し、
前記接続端子は、前記ビア配線の上面及び前記金属膜の上面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。 - 前記第1傾斜部には、前記頂部から前記接続端子に向かって延びる複数の筋状の突起部が並んで形成され、筋状の凹凸部が形成されてい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。
- 請求項1〜6のいずれか一項に記載の配線基板と、
回路形成面に形成された接続端子がはんだ層を介して前記表面処理層に電気的に接続され、前記配線基板に実装された電子部品と、
を有することを特徴とする半導体装置。 - 絶縁層の上面から上方に突出する接続端子を形成する工程と、
前記接続端子の側面及び上面を粗化する工程と、
前記絶縁層の上面に、前記接続端子の側面及び上面を被覆し、前記絶縁層と前記接続端子との段差に対応して上面が起伏する保護絶縁層を形成する工程と、
前記保護絶縁層を上面から薄化して前記接続端子の上部を露出するとともに、前記接続端子の周囲に位置する前記保護絶縁層の上面に、山なりに盛り上がる山部を形成する工程と、
前記保護絶縁層から露出された前記接続端子の側面及び上面を被覆し、前記山部の一部を被覆する表面処理層を形成する工程と、を有し、
前記山部を形成する工程では、頂部と、前記頂部から該頂部に近接する前記接続端子に向かって下方に傾斜する第1傾斜部と、前記頂部から、該頂部に近接する前記接続端子から離間する方向に向かって下方に傾斜する第2傾斜部とを有する前記山部を形成し、
前記表面処理層を形成する工程では、前記第1傾斜部と前記頂部と前記第2傾斜部の一部とを被覆するように前記表面処理層を形成することを特徴とする配線基板の製造方法。 - 前記保護絶縁層を薄化する工程の後であって、前記表面処理層を形成する工程の前に、前記保護絶縁層から露出された前記接続端子の側面及び上面を、前記保護絶縁層に被覆された前記接続端子の側面よりも表面粗度の小さい低粗度面に形成する工程を有する請求項8に記載の配線基板の製造方法。
- 前記保護絶縁層を形成する工程では、前記絶縁層の上面にポジ型の感光性樹脂を塗布して前記保護絶縁層を形成し、
前記保護絶縁層を薄化する工程では、前記保護絶縁層を未露光の状態で現像液によって溶解させて薄化することを特徴とする請求項8又は9に記載の配線基板の製造方法。
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