JP2883787B2 - パワー半導体装置用基板 - Google Patents
パワー半導体装置用基板Info
- Publication number
- JP2883787B2 JP2883787B2 JP5178386A JP17838693A JP2883787B2 JP 2883787 B2 JP2883787 B2 JP 2883787B2 JP 5178386 A JP5178386 A JP 5178386A JP 17838693 A JP17838693 A JP 17838693A JP 2883787 B2 JP2883787 B2 JP 2883787B2
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- alumina
- zirconia
- added
- semiconductor device
- 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.)
- Expired - Lifetime
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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Description
ジュールなどに適用するパワー半導体装置用基板、特に
セラミックス基板に銅板を直接接合したDBOC基板
(DirectBonding of Copper
Substrate) に関する。
立てたパワー半導体装置の構造を図1に示す。図におい
て、1は放熱金属ベース、2はセラミックス基板2aの
表裏両面に銅板2b,2cを貼り合わせたDBOC基
板、3は半導体チップ、4は外部導出端子、5はボンデ
ィングワイヤ、6は樹脂ケース、7は端子ブロック、8
は封止樹脂、9はゲル状充填材である。
いは窒化アルミニウムなどのセラミックス基板2aに対
し、その両面に箔状の薄い銅板2a,2bをダイレクト
・ボンド・カッパー法により(銅と微量の酸素との反応
により生成するCu−O共晶液相を接合剤として接合す
る)直接接合したものであり、主面側の銅版2cに回路
パターンを形成した上で、ここに半導体チップ3をダイ
ボンディングし、さらにワイヤ5をボンディングして回
路を組立てた後、DBOC基板2を放熱金属ベース1の
上に半田付けし、その後外部導出端子4の半田付けを行
いパッケージングする。
OC基板をパワートランジスタモジュールなどのパワー
半導体装置の基板として採用する場合には次記のような
問題がある。すなわち、パワートランジスタなどの半導
体装置では、通電動作に伴い半導体チップ3に多量の熱
を発生し、この熱がDBOC基板2を介して放熱金属ベ
ース1に伝熱した後に、金属ベースより外部に放熱され
る。したがって、このことから判るようにDBOC基板
の伝熱性の良否が半導体装置の電流容量を左右する重要
な因子となる。
基板2aを絶縁基材とした構造であるために熱伝導性が
比較的低い。ここで、セラミックス基板2aの材質とし
て従来より用いているアルミナと窒化アルミニウムの熱
伝導率を比べてみると、 アルミナ: 21W/m・K 窒化アルミニウム:180W/m・K であって、窒化アルミニウムのほうがアルミナに比べて
伝熱性がはるかに優れているが、反面、窒化アルミニウ
ムはアルミナに比べて材料コストが高い。
で作られたセラミックス基板に対し、放熱性を高めるた
めに基板の板厚を極力薄くして伝熱抵抗を小さく抑える
ことを試みた。しかしながら、アルミナセラミックス基
板の板厚を例えば0.3mm程度まで薄くすると、基板
の実強度が低下し、これが基で半導体チップ(シリコ
ン),放熱金属基板(銅)との接合時には各材料の熱膨
張係数差に起因して加わる熱応力によって基板にクラッ
ク,割れの欠陥が多く発生し、これが基で基板に絶縁不
良を引き起こすことが明らかになった。なお、前記各材
料の熱膨張係数を列記すると次のごとくである。
費の安価なアルミナを主材としたセラミックス基板につ
いて、その材料組成を改良することにより素材の機械的
強度,特に撓み性を高め、基板自身の薄形化と併せて放
熱性の改善が図れるようにしたパワー半導体装置用基板
を提供することを目的とする。
り、セラミックス基板に銅板を直接接合したパワー半導
体装置用基板に対し、前記セラミックス基板を、主成分
のアルミナを70〜90wt%としてこれに10〜30
wt%のジルコニアを添加した合計量に対して、更に
0.5〜2wt%のイットリア,カルシア,マグネシ
ア,セリアのいずれか1つを単味で添加した高温焼成体
で構成することにより達成される。
添加するジルコニアとして、イットリア,カルシア,マ
グネシア,セリアのいずれか1つを含有する安定化ジル
コニア、または部分安定化ジルコニアを用いることがで
きる。
ジルコニアを添加して焼成したセラミックス基板は、ア
ルミナ単体のセラミックス基板と比べて機械的強度、特
に曲げ強度が大幅に高まり、この場合にジルコニアの添
加量を10〜30wt%の範囲に選定することにより、
セラミックス基板の熱伝導率を低下させることなく、機
械強度,特に撓み性が向上し、更にアルミナとジルコニ
アの合計量に対して0.5〜2wt%のイットリア,カ
ルシア,マグネシア,セリアのいずれか1つを添加する
ことにより、セラミックス基板の焼成温度を低めに抑え
つつ、ジルコニア結晶粒の靱性が改善される。これらに
より、基板自身を薄形化することでパワー半導体装置の
基板として放熱性に優れたDBOC基板が得られる。
ア,セリアは単味で1つ添加するほか、これらの中の1
つの添加材で安定化,ないしは部分安定化したジルコニ
アをアルミナに添加しても同様な効果が得られる。
ず、アルミナにジルコニア,イットリアを添加して粒径
0.5〜3μm程度に粉砕混合し、さらにバインダーと
してポリビニルブチラールPVBを8wt%,溶剤とし
てトルエン,キシレン混合液を50wt%,可塑剤とし
てフタル酸ジオクチルDOPを2wt%添加して約20
時間混練した後、ドクターブレード法によりシート状に
成形してグリーンシートを得た。次にグリーンシートを
プレス加工により所定の形状に形抜きした後に温度15
50〜1650℃で焼成し、板厚0.32mmのセラミ
ックス基板を作成した。
を添加して作成したセラミックス基板の機械的特性を評
価するために、別途、ジルコニアの添加量を0wt%か
ら45wt%の範囲で様々に変えて前記と同じ方法で作
成した試料片を用意し、この試料片について強度試験を
行った。図2はこの強度試験結果を示すものであり、図
から判るようにアルミナにジルコニアを10wt%以上
添加することにより、アルミナ単体(ジルコニア添加量
が0wt%)のセラミックス基板(強度約300MP
a)と比べて強度が高まり、その強度は約350〜40
0MPa にも向上することが認められる。ただし、ジ
ルコニアの添加量を30wt%以上に増量しても強度の
増加は認めれない。
調べたところ、図3のような結果を得た。すなわち、ジ
ルコニアの添加量が約30wt%までの範囲ではアルミ
ナ単体と略同じ熱伝導率を示すが、ジルコニアの添加量
が30wt%を超えると熱伝導率が低下することが判明
した。したがって、セラミックス基板の材料組成を、ア
ルミナ70〜90wt%,ジルコニア10〜30wt%
の範囲に選定することにより、アルミナ単体のセラミッ
クス基板と比べて機械的強度が向上するほか、伝熱性に
ついてもアルミナと同等な熱伝導率を得ることができ
る。
して作成したセラミックス基板の試料片(板厚0.32
mm,幅寸法35mm)と、アルミナ単体で作成した同
じ寸法の試料片について、支点間距離40mmで曲げ試
験を行い、その最大撓み量を調べたところ、アルミナ単
体の試料片での撓み量が0.30mmであるのに対し、
ジルコニア添加の試料片では0.45mmの撓み量まで
耐えることが確認された。
ニアに加えて添加したイットリアは、アルミナ,ジルコ
ニアの焼結助剤およびジルコニア結晶粒の靱性向上を目
的に添加したものである。この場合に、イットリアの添
加量は0.5〜2wt%の範囲に定めるのがよい。すな
わち、イットリアの添加量が0.5wt%以下である
と、基板の焼成温度が1650℃以上となって基板の製
造が困難となる。また、添加量を2wt%以上とする
と、セラミックス基板の収縮率,強度に大きなばらつき
が生じるようになる。また、この添加剤としてイットリ
ア以外に、カルシア,マグネシア,セリアなどを単味で
添加しても同様な効果が得られ、さらにアルミナに添加
するジルコニアとして、前記のイットリア,カルシア,
マグネシア,セリアなど安定化,あるいは部分安定化し
たジルコニアを用いても同様な効果の得られることが確
認されている。
基板(板厚0.32mm)に対し、その表裏の両面に板
厚0.3mmのタフピッチ電解銅を重ね合わせた上で温
度1050〜1075℃の窒素雰囲気中で10分間加熱
し、セラミックス基板と銅板を直接接合してDBOC基
板を作成した後、このDBOC基板を用いて図1の半導
体装置を組立てた。また、比較例として、別途、板厚
0.63mm,0.32mmのアルミナ単体のセラミッ
クス基板で作成したDBOC基板を用いて同様な半導体
装置を組立て、これらの組立体に付いて機械的な変形耐
性試験,および断続通電試験を行った。
外力を加えて強制的な変形を与え、セラミックス基板の
絶縁不良に至るまでの変形量を調べた。この結果、ジル
コニア添加のアルミナ基板(板厚0.32mm)と板厚
0.63mmのアルミナ基板とでは殆ど同等な耐性を示
したが、板厚0.32mmのアルミナ基板は、約半分の
変形量で絶縁不良に至ることが判った。つまり、アルミ
ナにジルコニアを適量添加することにより、実用的には
セラミックス基板の板厚を略1/2まで薄くできること
が可能である。
のアルミナ基板(板厚0.32mm)は、板厚0.63
mmのアルミナ単体基板と比べて、同一のコレクタ損失
を与えたときの半導体チップの接合ブロック温度上昇Δ
Tj が約20%低減し、断続通電耐量が2.5〜3倍
に向上することが認められた。このことから判るよう
に、アルミナにジルコニアを添加したセラミックス基板
は、アルミナ単体の基板と比べて機械的特性に優れてお
り、基板自身の薄形化により放熱性の高い半導体装置用
基板として十分に期待できる。
の板厚を0.32mmとしたが、シート形成法によれば
板厚0.05〜1mmの基板を作成することができる。
また、原料粉にポリビニルアルコールPVAなどの結合
剤を添加し、湿式混合の後にスプレードライヤで乾燥造
粒した原料を用いて成形するプレス成形法を採用すれ
ば、板厚1mm以上の基板の作成も可能である。
ワー半導体装置のセラミックス基板として、アルミナを
70〜90wt%としてこれに10〜30wt%のジル
コニアを添加した合計量に対して、更に0.5〜2wt
%のイットリア,カルシア,マグネシア,セリアのいず
れか1つを単味で添加した焼成体を用いることにより、
従来のアルミナ単体のセラミックス基板と比べて収縮
率,強度にばらつきを生じることなく機械的強度を大幅
に増強できる。したがって、実用上でセラミックス基板
の薄形化が可能となり、これによりパワー半導体装置用
の基板として放熱性の高いDBOC基板が得られ、パワ
ー半導体装置の小形化,並びに電流容量の増大化に大き
く寄与できる。
置の構成断面図
の曲げ強度との関係を表す図
の熱伝導率との関係を表す図
Claims (2)
- 【請求項1】セラミックス基板に銅板を直接接合したパ
ワー半導体装置用基板において、前記セラミックス基板
が、主成分のアルミナを70〜90wt%としてこれに
10〜30wt%のジルコニアを添加した合計量に対し
て、更に0.5〜2wt%のイットリア,カルシア,マ
グネシア,セリアのいずれか1つを単味で添加した焼成
体よりなることを特徴とするパワー半導体装置用基板。 - 【請求項2】請求項1記載の基板において、アルミナに
添加するジルコニアが、イットリア,カルシア,マグネ
シア,セリアのいずれか1つを含有する安定化ジルコニ
ア、または部分安定化ジルコニアであることを特徴とす
るパワー半導体装置用基板。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5178386A JP2883787B2 (ja) | 1993-07-20 | 1993-07-20 | パワー半導体装置用基板 |
EP95100707A EP0727818B1 (en) | 1993-07-20 | 1995-01-19 | Zirconia-added alumina substrate with direct bonding of copper |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5178386A JP2883787B2 (ja) | 1993-07-20 | 1993-07-20 | パワー半導体装置用基板 |
EP95100707A EP0727818B1 (en) | 1993-07-20 | 1995-01-19 | Zirconia-added alumina substrate with direct bonding of copper |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0738014A JPH0738014A (ja) | 1995-02-07 |
JP2883787B2 true JP2883787B2 (ja) | 1999-04-19 |
Family
ID=26138407
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5178386A Expired - Lifetime JP2883787B2 (ja) | 1993-07-20 | 1993-07-20 | パワー半導体装置用基板 |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0727818B1 (ja) |
JP (1) | JP2883787B2 (ja) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2883787B2 (ja) * | 1993-07-20 | 1999-04-19 | 富士電機株式会社 | パワー半導体装置用基板 |
JP3127754B2 (ja) * | 1995-01-19 | 2001-01-29 | 富士電機株式会社 | 半導体装置 |
US5675181A (en) * | 1995-01-19 | 1997-10-07 | Fuji Electric Co., Ltd. | Zirconia-added alumina substrate with direct bonding of copper |
JP3176815B2 (ja) * | 1995-01-19 | 2001-06-18 | 富士電機株式会社 | 半導体装置用基板 |
CA2255441C (en) | 1997-12-08 | 2003-08-05 | Hiroki Sekiya | Package for semiconductor power device and method for assembling the same |
DE102005037522A1 (de) | 2005-08-09 | 2007-02-15 | Semikron Elektronik Gmbh & Co. Kg | Leistungshalbleitermodul mit wannenförmigem Grundkörper |
JP4526125B2 (ja) * | 2005-09-08 | 2010-08-18 | 日本インター株式会社 | 大電力用半導体装置 |
GB2452594B (en) | 2007-08-20 | 2012-04-25 | Champion Aerospace Inc | Switching assembly for an aircraft ignition system |
JP5134582B2 (ja) * | 2009-02-13 | 2013-01-30 | 日立オートモティブシステムズ株式会社 | 接続構造およびパワーモジュール |
CN102395540A (zh) | 2009-04-03 | 2012-03-28 | 株式会社住友金属电设备 | 陶瓷烧结体及采用其的半导体装置用基板 |
JP5937012B2 (ja) | 2010-11-01 | 2016-06-22 | Ngkエレクトロデバイス株式会社 | 電子部品素子収納用パッケージ |
JP2013032265A (ja) * | 2011-07-01 | 2013-02-14 | Maruwa Co Ltd | 半導体装置用アルミナジルコニア焼結基板及びその製造方法 |
CN102593111B (zh) * | 2012-02-23 | 2014-12-31 | 株洲南车时代电气股份有限公司 | Igbt模块及其制作方法 |
DE102012110322B4 (de) * | 2012-10-29 | 2014-09-11 | Rogers Germany Gmbh | Metall-Keramik-Substrat sowie Verfahren zum Herstellen eines Metall-Keramik-Substrates |
DE102013211405B4 (de) | 2013-06-18 | 2020-06-04 | Infineon Technologies Ag | Verfahren zur herstellung eines halbleitermoduls |
JP6630722B2 (ja) | 2014-08-28 | 2020-01-15 | ビーワイディー カンパニー リミテッド | セラミック基板およびその製造方法、パワーモジュール |
CN108191449B (zh) * | 2018-01-03 | 2021-04-27 | 上海富乐华半导体科技有限公司 | 一种铜-氧化铝陶瓷基板及其制备方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58137285A (ja) * | 1982-02-10 | 1983-08-15 | 株式会社日立製作所 | 金属板付セラミック基板の製造法 |
JPS6315430A (ja) * | 1986-07-07 | 1988-01-22 | Fuji Electric Co Ltd | 半導体装置の製造方法 |
US4769294A (en) * | 1986-11-26 | 1988-09-06 | Ceramics Process Systems Corp. | Alumina materials for low temperature co-sintering with refractory metallization |
DE3728096C1 (en) * | 1987-07-03 | 1989-01-12 | Duerrwaechter E Dr Doduco | Flat body, especially for use as a heat sink for electronic power components |
JP2727651B2 (ja) * | 1988-08-12 | 1998-03-11 | 旭硝子株式会社 | セラミックス基板 |
JP2872273B2 (ja) * | 1989-06-26 | 1999-03-17 | 三菱電機株式会社 | セラミツク基板材料 |
JP2883787B2 (ja) * | 1993-07-20 | 1999-04-19 | 富士電機株式会社 | パワー半導体装置用基板 |
-
1993
- 1993-07-20 JP JP5178386A patent/JP2883787B2/ja not_active Expired - Lifetime
-
1995
- 1995-01-19 EP EP95100707A patent/EP0727818B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0738014A (ja) | 1995-02-07 |
EP0727818B1 (en) | 2004-03-31 |
EP0727818A1 (en) | 1996-08-21 |
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