JP2007123395A - 半導体装置および半導体装置の製造方法 - Google Patents
半導体装置および半導体装置の製造方法 Download PDFInfo
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- JP2007123395A JP2007123395A JP2005311047A JP2005311047A JP2007123395A JP 2007123395 A JP2007123395 A JP 2007123395A JP 2005311047 A JP2005311047 A JP 2005311047A JP 2005311047 A JP2005311047 A JP 2005311047A JP 2007123395 A JP2007123395 A JP 2007123395A
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- semiconductor device
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- power semiconductor
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- 238000002844 melting Methods 0.000 claims abstract description 71
- 230000008018 melting Effects 0.000 claims abstract description 71
- 229910000765 intermetallic Inorganic materials 0.000 claims abstract description 53
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- 239000002184 metal Substances 0.000 claims abstract description 28
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- 229910020888 Sn-Cu Inorganic materials 0.000 claims description 7
- 229910019204 Sn—Cu Inorganic materials 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 229910052738 indium Inorganic materials 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229910052721 tungsten Inorganic materials 0.000 claims description 6
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- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/495—Lead-frames or other flat leads
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- H01L23/49513—Lead-frames or other flat leads characterised by the die pad having bonding material between chip and die pad
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- H01L23/495—Lead-frames or other flat leads
- H01L23/49579—Lead-frames or other flat leads characterised by the materials of the lead frames or layers thereon
- H01L23/49582—Metallic layers on lead frames
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Abstract
【解決手段】パワー半導体装置10において、パワー半導体素子11とNiめっき16が施されたフレーム12との接続部17は、パワー半導体素子11側から、260℃以上の融点を有する金属間化合物層17a、Cu層17b、260℃以上の融点を有する金属層17c、Cu層17d、260℃以上の融点を有する金属間化合物層17eの積層構造から構成される。この接続部17の構造により、熱膨張率差の大きいパワー半導体素子11とフレーム12との接続において、2次実装および温度サイクルにより発生する応力を緩衝する。
【選択図】図3
Description
ウイリアムズ(Williams W.So)等、「ハイ テンペラチュア ジョイント マニュファハクチュアド アット ロウ テンペラチュア(High Temperature Joints Manufactured at Low Temperature)」、プロシーデイング オブ イーシーティーシー(Proceeding of ECTC)、1998年、p284 山本等、「Sn−Agはんだを用いたマイクロ接続部の金属間化合物化に関する研究」、MES2003の概要集、2003年10月、p45
本実施の形態の半導体装置は、半導体素子と表面にNiめっきが施されたフレームとの接続部が、半導体素子側から、260℃以上の融点を有する金属間化合物層、Cu層、260℃以上の融点を有する金属層、Cu層、260℃以上の融点を有する金属間化合物層からなるものである。
図3は、本実施の形態1に関わるパワー半導体装置の断面図を示す。
図7は、本実施の形態2に関わるパワー半導体装置の断面図を示す。
図8は、本実施の形態3に関わるパワー半導体装置の断面図を示す。
Claims (10)
- 半導体素子と、前記半導体素子が接続されるフレームとを有し、
前記フレームは、表面にNiめっきが施されたものであり、
前記半導体素子と前記フレームとの接続部は、前記半導体素子側から、260℃以上の融点を有する第1の金属間化合物層、第1のCu層、260℃以上の融点を有する金属層、第2のCu層、260℃以上の融点を有する第2の金属間化合物層の積層構造からなることを特徴とする半導体装置。 - 請求項1記載の半導体装置において、
前記第1の金属間化合物層および前記第2の金属間化合物層は、260℃以下の融点を有する、Sn、Sn−Cu系、Sn−Ag系、Sn−Ag−Cu系、In、In−Sn系、In−Ag系、In−Cu系の鉛フリーはんだの少なくとも1つと、前記第1のCu層または前記第2のCu層とが反応して形成されることを特徴とする半導体装置。 - 請求項1記載の半導体装置において、
前記金属層は、インバー合金、Cu−Mo合金、Ti、Mo、Wのいずれか1つからなることを特徴とする半導体装置。 - 請求項1記載の半導体装置において、
前記金属層は、Al、Mg、Ag、Zn、Cuのいずれか1つからなることを特徴とする半導体装置。 - 半導体素子と、前記半導体素子が接続されるフレームとを有し、前記フレームは、表面にNiめっきが施されたものである半導体装置の製造方法であって、
前記半導体素子と前記フレームとを、260℃以上の融点を有する金属層の表裏面にCu層、その上に260℃以下の融点を有する鉛フリーはんだ層を設けた複合箔を用いて接続し、さらに、加熱して前記Cu層と前記鉛フリーはんだ層とを反応させ、260℃以上の融点を有する金属間化合物を形成し、前記半導体素子と前記フレームとの接続部を260℃で非溶融化したことを特徴とする半導体装置の製造方法。 - 請求項5記載の半導体装置の製造方法において、
前記鉛フリーはんだ層は、260℃以下の融点を有する、Sn、Sn−Cu系、Sn−Ag系、Sn−Ag−Cu系、In、In−Sn系、In−Ag系、In−Cu系の鉛フリーはんだの少なくとも1つであることを特徴とする半導体装置の製造方法。 - 請求項5記載の半導体装置の製造方法において、
前記金属層は、インバー合金、Cu−Mo合金、Ti、Mo、Wのいずれか1つからなることを特徴とする半導体装置の製造方法。 - 請求項5記載の半導体装置の製造方法において、
前記金属層は、Al、Mg、Ag、Zn、Cuのいずれか1つからなることを特徴とする半導体装置の製造方法。 - 請求項5記載の半導体装置の製造方法において、
前記金属間化合物の形成は、N2雰囲気で行うことを特徴とする半導体装置の製造方法。 - 請求項5記載の半導体装置の製造方法において、
前記金属間化合物の形成は、N2+H2雰囲気で行うことを特徴とする半導体装置の製造方法。
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