JP2008098586A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
- Publication number
- JP2008098586A JP2008098586A JP2006281695A JP2006281695A JP2008098586A JP 2008098586 A JP2008098586 A JP 2008098586A JP 2006281695 A JP2006281695 A JP 2006281695A JP 2006281695 A JP2006281695 A JP 2006281695A JP 2008098586 A JP2008098586 A JP 2008098586A
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- Japan
- Prior art keywords
- metal plate
- semiconductor device
- semiconductor
- semiconductor elements
- laser welding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 211
- 229910052751 metal Inorganic materials 0.000 claims abstract description 119
- 239000002184 metal Substances 0.000 claims abstract description 119
- 239000004020 conductor Substances 0.000 claims abstract description 89
- 238000003466 welding Methods 0.000 claims abstract description 59
- 230000003685 thermal hair damage Effects 0.000 abstract description 11
- 230000000630 rising effect Effects 0.000 description 13
- 238000002844 melting Methods 0.000 description 12
- 230000008018 melting Effects 0.000 description 12
- 229910000679 solder Inorganic materials 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 230000001678 irradiating effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000005476 soldering Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910016525 CuMo Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- WUUZKBJEUBFVMV-UHFFFAOYSA-N copper molybdenum Chemical compound [Cu].[Mo] WUUZKBJEUBFVMV-UHFFFAOYSA-N 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
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- Engineering & Computer Science (AREA)
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Abstract
【解決手段】複数の半導体素子13a,13bを搭載した半導体装置100において、半導体素子13a,13bの上面に金属板20を接合した。そして、金属板20に半導体装置100の電流経路となる導体板15をレーザー溶接によって接合した。溶接は、導体板15が半導体素子13a,13bの直上に位置する金属板20以外の部分の金属板20とレーザー溶接によって接合されている。これにより、レーザー溶接による熱ダメージを低減させることのできる半導体装置の実現が可能になる。
【選択図】図1
Description
この図は、IGBT素子を搭載した半導体装置の基本的な構成を説明する図である。
この半導体装置では、冷却体であるCu(銅)ベース200の上に半田201を介して絶縁基板202が接合されている。Cuベース200の上端縁203には、IGBT素子204を取り囲むように、樹脂ケース205が固着されている。
また、最近では、半導体素子から放出される熱を充分に分散させるため、図8に示すアルミワイヤ208、209、213を金属製の導体板に代える方法が報告されている(例えば、特許文献2参照。)。
そして、この報告例では、導体板のボンディングが超音波接合法により行われている。
最初に、第1の実施の形態について説明する。
図2は第2の実施の形態の半導体装置の要部断面模式図である。ここで、第2の実施の形態の説明においては、図1と同一の要素については同一の符号を付し、その説明の詳細は省略する。尚、この図面では、半導体装置内の冷却体、外部導出端子及び樹脂ケースは図示が省略されている。
ここで、金属板21は、半導体素子13a,13bの直上に配置されている他、半導体素子13a上から横方向に引き伸ばされて、庇(ひさし)部21aを具備している。
レーザー溶接は、レーザー光を導体板15の上から照射させることにより行う(不図示)。即ち、レーザー光が照射された部分の導体板15及び金属板21のそれぞれの一部分を溶融させることで、それぞれが接合されている。
図3は第3の実施の形態の半導体装置の要部断面模式図である。ここで、第3の実施の形態の説明においては、図1と同一の要素については同一の符号を付し、その説明の詳細は省略する。尚、この図面では、半導体装置内の冷却体、外部導出端子及び樹脂ケースは図示が省略されている。
ここで、金属板22はブロックであり、その下面には溝部22aが形成されている。全体としては、逆溝構造である。さらに、所定の体積を具備している。
ここで、レーザー溶接は、レーザー光を導体板15上から照射させることにより行う(不図示)。即ち、レーザー光が照射された部分の導体板15及び金属板22のそれぞれの一部分を溶融させることで、それぞれが接合されている。
その結果、導体板15と金属板22の接合にレーザー溶接を用いても、レーザー照射による半導体素子13a,13bへの熱ダメージを低減させた半導体装置の実現が可能になる。
次に、第4の実施の形態について説明する。
図4は第4の実施の形態の半導体装置の要部断面模式図である。ここで、第4の実施の形態の説明においては、図1と同一の要素については同一の符号を付し、その説明の詳細は省略する。尚、この図面では、半導体装置内の冷却体、外部導出端子及び樹脂ケースが略されている。
ここで、金属板23は、直方体であり、所定の体積を具備している。
ここで、レーザー溶接は、レーザー光を導体板15の上から照射させることにより行う(不図示)。即ち、レーザー光が照射された部分の導体板15及び金属板23のそれぞれの一部分を溶融させることで、それぞれが接合されている。
その結果、導体板15と金属板23の接合にレーザー溶接を用いても、レーザー照射による半導体素子13a,13bへの熱ダメージを低減させた半導体装置の実現が可能になる。
次に、第5の実施の形態について説明する。
ここで、金属板24は平板ではなく、隣接する半導体素子の中間部に対応する部分(図5では金属板24の中央領域)に突出部24aを備え、突出部24aが形成された中央領域と上端面24bとの間に段差が設けられている。突出部24aの上面には、導体板15とのレーザー溶接を行うための平坦な面が形成されている。図示の例では、上端面24bからの立ち上がり部24cは、上端面24bからほぼ鉛直に立ち上がっており、突出部24aは、ほぼ矩形状となっている。突出部24aの形状は矩形状に限るものではない。例えば、立ち上がり部24cを傾斜させたり、途中で屈曲させたり、曲線状に形成してもよい。それらの構造を次に説明する。
この図に示すように、立ち上がりの形状を図6(A)のように傾斜構造を備えた立ち上がり部24dであったり、図6(B)のように曲線形状の立ち上がり部24eであったり、図6(C)及び(D)のように屈折構造を備えた立ち上がり部24f,24gとすることもできる。
そして、金属板24の突出部24aの上には、導体板15がレーザー溶接を用いて溶接されている。
その結果、導体板15と金属板24の接合にレーザー溶接を用いても、レーザー照射による半導体素子13a,13bへの熱ダメージを低減させた半導体装置の実現が可能になる。
図7は第6の実施の形態の半導体装置の要部模式図であり、(A)は要部立体模式図であり、(B)は要部上面模式図であり、(C)は要部断面模式図である。ここで、(C)は(B)のA−A’の位置に対応している。尚、第6の実施の形態の説明においては、図1と同一の要素については同一の符号を付し、その説明の詳細は省略する。尚、この図面では、半導体装置内の冷却体、外部導出端子及び樹脂ケースが略されている。
ここで、金属板25は、立体形状のブロックであり、隣接する半導体素子の中間部金属板25の四方にある上端面25aよりも高い突出部25bが設けられている。即ち、金属板25には、段差が設けられている。突出部25bの上面には、導体板15とのレーザー溶接を行うための平坦な面が形成されている。図示の例では、突出部25bは、上端面25aからの立ち上がり部25cがほぼ鉛直の矩形状に形成した。立ち上がり部25cの形状は第5の実施の形態と同様に、矩形状に限らず、図6に示すような傾斜形状,屈曲形状,曲線形状などが適用可能である。
レーザー溶接は、レーザー光を導体板15の上から照射させることにより行う(不図示)。即ち、レーザー光が照射された部分の導体板15及び突出部25bのそれぞれの一部分を溶融させることで、それぞれが接合されている。
ここで、金属板25と導体板15との接合界面30が半導体素子13a,13b,13c,13dの直上に位置する金属板25の上端面25aより高くなるように、金属板25の突出部25bと導体板15がレーザー溶接によって接合されている。
その結果、導体板15と金属板25の接合にレーザー溶接を用いても、レーザー照射による半導体素子13a,13b,13c,13dへの熱ダメージを低減させた半導体装置の実現が可能になる。
11 Cu箔
12,14 半田
13a,13b,13c,13d 半導体素子
15 導体板
16 レーザー照射部
17 溶融部
20,21,22,23,24,25 金属板
21a 庇部
22a 溝部
24a,25b 突出部
24b,25a 上端面
24c,24d,24e,24f,24g,25c 立ち上がり部
30 接合界面
100,101,102,103,104,105 半導体装置
Claims (8)
- 少なくとも一つの半導体素子を搭載した半導体装置において、
前記半導体素子の上面に接合された金属板と、
前記金属板に接合され、前記半導体装置の電流経路となる導体板と、を備え、
前記導体板と前記金属板とは、前記半導体素子の直上以外の部分でレーザー溶接によって接合されていることを特徴とする半導体装置。 - 複数の半導体素子を搭載した半導体装置において、
前記複数の半導体素子上に架設され、前記複数の半導体素子の上面に接合された金属板と、
前記金属板に接合され、前記半導体装置の電流経路となる導体板と、を備え、
前記導体板と前記金属板とは、隣接する半導体素子の中間部の直上の部分でレーザー溶接によって接合されていることを特徴とする半導体装置。 - 前記金属板に庇部を設け、前記導体板と前記金属板とは、前記庇部においてレーザー溶接によって接合されていることを特徴とする請求項1記載の半導体装置。
- 前記金属板をブロック形状とし、前記金属板の下部のうち、隣接する半導体素子の中間部に対応する部分に溝が形成されていることを特徴とする請求項2記載の半導体装置。
- 前記金属板が直方体であることを特徴とする請求項2記載の半導体装置。
- 前記金属板と前記導体板との接合界面が前記半導体素子の直上に位置する前記金属板の上端面より高いことを特徴とする請求項1記載の半導体装置。
- 前記金属板の、隣接する半導体素子の中間部に対応する部分に突出部を設け、前記突出部と前記導体板とが前記レーザー溶接によって接合されていることを特徴とする請求項2記載の半導体装置。
- 立体状の前記金属板に突出部が設けられ、前記突出部と前記導体板とが前記レーザー溶接によって接合されていることを特徴とする請求項6記載の半導体装置。
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