JP6881304B2 - 半導体装置及び半導体装置の製造方法 - Google Patents
半導体装置及び半導体装置の製造方法 Download PDFInfo
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- JP6881304B2 JP6881304B2 JP2017527454A JP2017527454A JP6881304B2 JP 6881304 B2 JP6881304 B2 JP 6881304B2 JP 2017527454 A JP2017527454 A JP 2017527454A JP 2017527454 A JP2017527454 A JP 2017527454A JP 6881304 B2 JP6881304 B2 JP 6881304B2
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Description
背景技術
特許文献2:特開2012−028674号公報
課題を解決するための手段
(第1の実施形態)
図1は、本発明に係る半導体装置の第1の実施形態の構造断面図を示す。同図において、本実施形態の半導体装置10は、厚さaのベース板11が厚さbの導電性の接合層12を介して厚さcの半導体チップ13に電気的に接続された構造であり、例えばベース板11の表面の回路パターンが導電性の接合層12を介して半導体チップ13に接続されている。
次に、本発明に係る半導体装置の第2の実施形態について説明する。図2は、本発明に係る半導体装置の第2の実施形態の構造断面図を示す。同図中、図1と同一構成部分には同一符号を付し、その説明を省略する。図2に示す第2の実施形態の半導体装置20は、ベース板21が平板状の導電体21aと21bとの間に平板状の絶縁体21cが挿入された三層構造であり、導電体21aの表面に接合層12を介して半導体チップ13が電気的に接続されるとともに、導電体21bの表面に接合層22を介して放熱板23が接合された構造である点に特徴がある。
次に、本発明に係る半導体装置の第3の実施形態について説明する。図3は、本発明に係る半導体装置の第3の実施形態の構造断面図を示す。同図中、図1と同一構成部分には同一符号を付し、その説明を省略する。図3に示す第3の実施形態の半導体装置30は、半導体チップ13のベース板11が接合されている面と反対側の面に第2の導電性接合層32により第2のベース板31を電気的に接続した構造に特徴がある。
次に、本発明に係る半導体装置の第4の実施形態について説明する。図4は、本発明に係る半導体装置の第4の実施形態の構造断面図を示す。同図中、図2と同一構成部分には同一符号を付し、その説明を省略する。図4に示す第4の実施形態の半導体装置40は、第2の実施形態の半導体装置20において半導体チップ13のベース板21や放熱板23が形成されている面と反対側の面に、第2の導電性接合層42により第2のベース板41を電気的に接続した構造に特徴がある。
次に、本発明に係る半導体装置の第5の実施形態について説明する。図5は、本発明に係る半導体装置の第5の実施形態の構造断面図を示す。同図中、図4と同一構成部分には同一符号を付し、その説明を省略する。図5に示す第5の実施形態の半導体装置50は、第4の実施形態の半導体装置40における第2のベース板41の半導体チップ13が接合されている面と反対側の面に、接合層51により第2の放熱板52を接合した構造に特徴がある。
次に、本発明に係る半導体装置の第6の実施形態について説明する。図6は、本発明に係る半導体装置の第6の実施形態の構造断面図を示す。同図中、図2と同一構成部分には同一符号を付し、その説明を省略する。図6に示す第6の実施形態の半導体装置60は、第2の実施形態の半導体装置20と比較して、より一層熱サイクルによるストレスに対する信頼性向上と、放熱性の向上を図った構造で、パワーモジュールに適用して好適な構造である。
図8は、本発明に係る半導体装置の第1の実施形態の製造方法の一例の概略を示す各工程における素子断面図を示す。同図中、図1と同一構成部分には同一符号を付し、その説明を省略する。まず、図8(a)に示すように、線膨張係数が2〜10ppm/Kであるベース板11表面の回路パターン上に、所定の材質で厚さ50μm程度の固形の導電性接合材15を搭載し、更にその導電性接合材15の上に半導体チップ13の電極形成面が接触するように載置する。半導体チップ13は、厚さが350μmで線膨張係数が3〜4ppm/Kである。
図11は、本発明に係る半導体装置の第1実施例の構造断面図を示す。本実施例の半導体装置100は、図2に示した半導体装置20の実施例でパワーモジュールに適用した例を示す。図11において、半導体チップ101(図2の13に相当)は線膨張係数4ppm/KのSiCにより構成されており、その下面が半導体チップ用接合層102(図2の12に相当)によりベース板である絶縁基板103(図2の21に相当)の表面に接続されている。ここで、接合層102は、厚さ50μmの金属焼結体からなる。また、絶縁基板103は平板状のセラミック基板の上下両面に銅箔が被覆形成された三層構造で、その線膨張係数は5.2ppm/Kである。従って、本実施例では半導体チップ101の熱膨張係数と絶縁基板103の熱膨張係数との差の絶対値は7ppm/K以下である。
図12は、本発明に係る半導体装置の第2実施例の構造断面図を示す。同図中、図11と同一構成部分には同一符号を付し、その説明を省略する。本実施例の半導体装置110は、図6に示した半導体装置60の実施例で、パワーモジュールに適用した例を示す。図12において、半導体チップ101(図6の13に相当)は線膨張係数4ppm/KのSiCにより構成されており、その下面が半導体チップ用接合層111(図6の61に相当)によりベース板である絶縁基板112(図6の21に相当)の表面に接続されている。ここで、接合層111は、厚さ50μmで、かつ、緻密度が96%以上であるCu焼結体である。なお、接合層111はAg又はNi等の他の金属焼結体でもよい。また、絶縁基板112は平板状のSiNからなる基板の上下両面に銅箔が被覆形成された三層構造で、その線膨張係数は5.2ppm/Kである。従って、本実施例では半導体チップ101の熱膨張係数と絶縁基板112の熱膨張係数との差の絶対値は7ppm/K以下である。
Claims (15)
- 半導体チップと、
前記半導体チップの線膨張係数との差の絶対値が1.2ppm/K以下である線膨張係数を有する第1のベース板と、
前記第1のベース板と前記半導体チップとを電気的に接続する、厚さが前記半導体チップよりも薄い金属焼結体からなる第1の接合層と
を備えることを特徴とする半導体装置。 - 前記金属焼結体は、Cu焼結体、Ag焼結体又はNi焼結体であることを特徴とする請求項1に記載の半導体装置。
- 前記第1の接合層は、厚さが50μm以下であることを特徴とする請求項1又は2に記載の半導体装置。
- 前記第1の接合層を構成する前記金属焼結体は、緻密度が96%以上であることを特徴とする請求項1乃至3のうちいずれか一項に記載の半導体装置。
- 前記第1のベース板は、平板状のセラミック基板の上下両面に銅箔が被覆形成された三層構造を有し、
前記第1のベース板の線膨張係数は5.2ppm/K以下であることを特徴とする請求項1乃至4のいずれか1項に記載の半導体装置。 - 前記第1のベース板は、平板状のSiNからなる基板の上下両面に銅箔が被覆形成された三層構造を有し、
前記第1のベース板の線膨張係数は5.2ppm/K以下であることを特徴とする請求項1乃至4のいずれか1項に記載の半導体装置。 - 前記第1のベース板の線膨張係数と前記半導体チップの線膨張係数との差の絶対値が1.2ppm/Kであることを特徴とする請求項1乃至6のいずれか1項に記載の半導体装置。
- 前記第1のベース板の線膨張係数との差の絶対値が7ppm/K以下である線膨張係数を有する第1の放熱板と、
前記第1のベース板の前記半導体チップが接合されている面と反対側の面を、前記第1の放熱板に接合する第2の接合層と
を更に備えることを特徴とする請求項1乃至7のうちいずれか一項に記載の半導体装置。 - 前記第1の放熱板は、熱伝導率が250W/mK以上の金属複合材から構成されていることを特徴とする請求項8に記載の半導体装置。
- 前記第1の放熱板を構成する前記金属複合材は、厚み方向に280W/mK以上の熱伝導率を有する、銅・インバー・銅(CIC)複合材であることを特徴とする請求項9に記載の半導体装置。
- 前記第2の接合層は、Ag、Cu及びNiのうち少なくとも一種を含む焼結体、又はAu、Zn、Bi、Cu、Pb及びSnのうち少なくとも一種を含む融点が250℃以上の半田により形成されていることを特徴とする請求項8乃至10のうちいずれか一項に記載の半導体装置。
- 前記半導体チップの線膨張係数との差の絶対値が7ppm/K以下である線膨張係数を有する第2のベース板と、
前記半導体チップの前記第1のベース板に接合されている面と反対側の面を、前記第2のベース板に接合する、厚さ50μm以下の第3の接合層と
を更に備えることを特徴とする請求項1乃至11のうちいずれか一項に記載の半導体装置。 - 前記半導体チップの線膨張係数との差の絶対値が7ppm/K以下である線膨張係数を有する第2のベース板と、
前記半導体チップの前記第1のベース板に接合されている面と反対側の面を、前記第2のベース板に接合する、厚さ50μm以下の第3の接合層と、
前記第2のベース板の線膨張係数との差の絶対値が7ppm/K以下である線膨張係数を有する第2の放熱板と、
前記第2のベース板の前記半導体チップが接合されている面と反対側の面を、前記第2の放熱板に接合する第4の接合層と
を更に備えることを特徴とする請求項1乃至11のうちいずれか一項に記載の半導体装置。 - 前記第1のベース板は、第1の導電層、絶縁層、及び第2の導電層が厚さ方向に積層された積層構造体であることを特徴とする請求項1乃至13のうちいずれか一項に記載の半導体装置。
- 請求項8に記載の半導体装置の製造方法であって、
前記第1の放熱板の上に前記第2の接合層用の固形接合材、前記第1のベース板、前記第1の接合層用の固形の導電性接合材、及び前記第1のベース板の線膨張係数との差の絶対値が7ppm/K以下である線膨張係数を有する前記半導体チップをこの順で順次積層した構造体を作成する第1の工程と、
前記構造体の全体を加熱処理して前記第2の接合層用の固形接合材を溶融して得た前記第2の接合層により前記第1の放熱板と前記第1のベース板とを接合すると同時に、前記第1の接合層用の固形の導電性接合材を溶融して得た前記第1の接合層により前記第1のベース板と前記半導体チップとを接合する第2の工程と
を含むことを特徴とする半導体装置の製造方法。
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JP2011216619A (ja) * | 2010-03-31 | 2011-10-27 | Nippon Steel Chem Co Ltd | 積層構造体及びその製造方法 |
JP5542567B2 (ja) | 2010-07-27 | 2014-07-09 | 三菱電機株式会社 | 半導体装置 |
JP5602077B2 (ja) * | 2011-03-23 | 2014-10-08 | 三菱電機株式会社 | 半導体装置 |
US9437581B2 (en) * | 2012-05-31 | 2016-09-06 | Panasonic Intellectual Property Management Co., Ltd. | LED module |
JP2014120639A (ja) | 2012-12-18 | 2014-06-30 | Rohm Co Ltd | パワーモジュール半導体装置 |
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2016
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