JP5413707B2 - 金属−セラミック複合基板及びその製造方法 - Google Patents
金属−セラミック複合基板及びその製造方法 Download PDFInfo
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- JP5413707B2 JP5413707B2 JP2005166162A JP2005166162A JP5413707B2 JP 5413707 B2 JP5413707 B2 JP 5413707B2 JP 2005166162 A JP2005166162 A JP 2005166162A JP 2005166162 A JP2005166162 A JP 2005166162A JP 5413707 B2 JP5413707 B2 JP 5413707B2
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Description
しかしながら、プリント基板の材料として、紙フェノール樹脂、エポキシ樹脂、ガラスエポキシ樹脂などの各種樹脂が使用されているので、低コストではあるが、放熱性がよくない。
また、回路構造が微細化してくると、所詮、CuやAlを基板とする金属基板よりも熱伝導率熱が小さいセラミック基板の体積当りの熱抵抗は大きくなる。したがって、半導体素子を搭載するような微小回路、例えばサブマウントにおいては、サブマウント全体におけるAlN基板の熱抵抗が90%以上となって放熱性が悪くなり、放熱性といった面で必ずしも適しているとはいえない。
上記構成において、好ましくは、前記セラミック保護層を形成していない領域のセラミック層上に、さらに上記半田層とは別の半田層が直接形成される。また、好ましくは、セラミック層、セラミック層保護膜、電極層及び半田層は、金属基板の表面及び裏面の両面にそれぞれ積層されている。
金属基板は、好ましくは、銅又はアルミニウムからなる。
半田層は、好ましくは、銀、金、銅、亜鉛、ニッケル、インジウム、ガリウム、ビスマス、アルミニウム、スズのうち、2種類以上の元素を含む。半田層は、好ましくは、金及びスズを含む。
上記構成において、好ましくは、前記セラミック保護層を形成していない領域のセラミック層上に、さらに別の半田層を直接形成する工程を含む。また、好ましくは、セラミック層、セラミック層保護膜、電極層及び半田層を、金属基板の表面及び裏面の両面にそれぞれ形成する。
半田層を、好ましくは、銀、金、銅、亜鉛、ニッケル、インジウム、ガリウム、ビスマス、アルミニウム、スズのうち、2種類以上の元素を含む組成とする。半田層を、好ましくは、金及びスズを含む組成とする。
図1及び図2は、本発明による金属−セラミック複合基板の構造を模式的に示す断面図である。図1において、金属−セラミック複合基板10は、金属基板11と、この金属基板11の片面にてこの金属基板11の全体を覆うように形成されたセラミック層12と、このセラミック層12の一部又は全面を覆うようにセラミック層12の表面に形成された電極層13と、この電極層13表面の所定箇所13Aに形成された半田層14と、から構成されている。
ここで、電極層13の所定箇所13Aとしては、発光ダイオードなどの場合には、全面でもよい。また、半田層が形成されない電極層13Bがあってもよい。この電極層13Bには、パターンが形成されていてもよい。また、電極層13Bの一部には、金線を接続し、電気回路を形成してもよい。
一方、図示するように、右側の電極層13Aとは絶縁され、かつ、半田層が形成されていない左側の電極層13B上には、半導体装置15の上部電極15BをAu線16などによりワイヤーボンディングして、接続することができる。
ここで、半導体装置15とは、レーザーダイオード又は発光ダイオードのような発光素子、ダイオード、高周波増幅やスイッチングに使用されるトランジスタやサイリスタのような能動素子、集積回路などである。
なお、図2においては搭載する電子部品として半導体装置15を示しているが、受動素子や各種能動素子を含む電子回路であってもよい。
この場合には、上記(1)式の第1項で表わされる金属−セラミック複合基板10において、金属基板11の熱抵抗を1とすれば、セラミック層12,電極層13A,半田層14の熱抵抗は、それぞれ、0.03,0.0002,0.06程度となる。これらの各層において、半田層14,セラミック層12,電極層13Aの順に熱抵抗は大きい。それでも、これらの各層による熱抵抗の合計は、金属基板11による熱抵抗の約1/15であり、本発明の金属−セラミック複合基板10の熱抵抗は、上記(2)で近似できることが分かる。
図4及び図5は、本発明による金属−セラミック複合基板の変形例の構造を模式的に示す断面図である。図4に示す金属−セラミック複合基板20が、図1に示した金属−セラミック複合基板10と異なるのは、セラミック層12上に直接、上記半田層14とは別に、半田層22を形成している点である。この半田層22は、電極層13と接続して電気回路を構成してもよい。また、他の電子回路部品を搭載するための配線パターンとすることもできる。半田層22は、電極層13上に設ける半田層14の形成時に同時に形成することができる。
図6及び図7は、本発明による金属−セラミック複合基板の別の変形例の構造を模式的に示す断面図である。図6に示す金属−セラミック複合基板30が、図1に示した金属−セラミック複合基板10と異なるのは、セラミック層12と電極層13との間に、セラミック層保護膜24を挿入した点にある。
セラミック層保護膜24は、本発明の金属−セラミック複合基板30を製造する際に、最初にセラミック層12の全面に被覆する層であり、電極層13及び半田層14のパターンを形成する際の工程においてエッチングなどによりセラミック層12がエッチングされたり、その表面粗さが大きくなるのを防止するために設けている。そして、このセラミック層保護膜24は、半田層14を形成した後で、不要な領域を除去することにより金属−セラミック複合基板30上に形成する電極層13との絶縁分離をすることができる。
ここで、セラミック層保護膜24は、セラミック層12との密着性が良好で、電極層14とは異なる金属が望ましく、チタン、白金、ニッケル、タングステン、モリブデン(Mo)、銀、銅、鉄、アルミニウム、金の何れかを用いることができる。また、これらの金属を2種類以上含んでもよい。例えば、セラミック層12上にチタンを積層して形成することができる。
最初に、金属基板11を用意し、その両面を研磨した後、研磨済み金属基板11を洗浄し、表面清浄化を行い、金属基板11の表面に、セラミック層12としてのAlN薄膜を形成する。このセラミック層12は、例えばPVD法(物理蒸着法:physical vapor deposition)やCVD法(化学気相反応法:chemical vapor deposition)により形成することができる。
これにより、本発明の金属−セラミック複合基板10,10A,20,20A,30,30Aの製造方法によれば、半導体装置15との熱抵抗が小さく、放熱性の良好な金属−セラミック複合基板を、低コストで歩留まりよく製造することができる。
最初に、実施例の金属−セラミック複合基板30Aの製造方法について説明する。
50mm×50mmの大きさで、厚さが300μmであり、熱伝導率が300W/mKのCuからなる金属基板11の両面を洗浄して表面清浄化を行ない、この金属基板11の表面及び裏面全体に、厚さ10μmのAlNからなるセラミック層12をPVD法により形成した。PVD法としては、スパッタ装置を用いた。ターゲットとしてAlを用い、さらに、窒素ガスを同時に供給することでAlN薄膜12を堆積した。このAlN薄膜の熱伝導率は200W/mKであった。
次に、AlN薄膜12の表面及び裏面の全面にセラミック層保護膜24となる、熱伝導率が20W/mKのTiを、真空蒸着装置により0.05μm堆積した。
露光後、テトラメチルアミン系液現像液により、電極層13となる部分のレジストを溶解し、セラミック層保護膜24を露出させた。この際、金属基板11の裏面側のセラミック層保護膜24には、パターニングを施さなかった。
次に、真空蒸着装置により金属基板11の表面及び裏面側のセラミック層保護膜24に、熱熱伝導率が315W/mKの金を蒸着した。そして、金属基板11の表面側のセラミック層保護膜24膜に形成したレジストパターンにリフトオフ工程を施した。具体的には、アセトンを用いてレジスト全体を溶解させることにより、電極層13以外のAuを除去し、所定の電極層13を形成した。電極層13の厚さは0.1μmであり、そのサイズは両面共に800μm角であった。
(比較例1)
図8に示すように、熱伝導率が200W/mKで厚さが520μmのAlNからなるセラミック基板51の表面及び裏面に、蒸着法により厚さ0.05μmのTi及び厚さ0.1μmのAuからなる電極層52及び厚さ5μmのAu0.8 Sn0.2 (元素比)からなる半田層53を形成して、セラミック基板による回路基板50を製造した。セラミック基板51の大きさと、その表面側に設けた電極層52及び半田層53のパターン寸法と、は実施例と同じとした。
図9に示すように、熱伝導率が300W/mKで、厚さ500μmのCuからなる金属基板61の両面に、厚さ10μmのフィラー(10W/mK)による絶縁層62を形成し、さらにその上から蒸着法により厚さ0.05μmのTi及び厚さ0.1μmのAuからなる電極層63及び厚さ5μmのAu0.8 Sn0.2 (元素比)からなる半田層64を形成して、回路基板60を製造した。金属基板61の大きさと、その表面側に設けた電極層63及び半田層64のパターン寸法とは実施例と同じとした。
実施例で製造した金属−セラミック複合基板30A及び比較例1,2で製造した回路基板50,60に対して、それぞれ半田層に対して発光ダイオードを接合し、通電後の温度上昇及び熱抵抗を測定した(表1参照)。
これに対して、比較例1の回路基板50では、熱抵抗は2.8℃/Wであり、またチップ側温度と放熱側温度との温度差は4.2℃であった。さらに、比較例2の回路基板60では、熱抵抗は3.9℃/Wであり、またチップ側温度と放熱側温度との温度差は5.8℃であった。
また、上述した実施形態においては、セラミック層12は、AlNから構成されているが、これに限らず、他のセラミック材料から構成されていてもよい。さらに、電極層13や半田層14のパターンは、目的の回路構成となるように適宜に設計すればよい。
11,61:金属基板
12:セラミック層(セラミック薄膜)
13,52,63:電極層
14,53,64:半田層
15:半導体装置
15A:上部電極
15B:下部電極
16:Au線
22:半田層(セラミック層上に形成される半田層)
24:セラミック層保護膜
Claims (11)
- 金属基板と、該金属基板上に形成されたセラミック層と、該セラミック層上に形成されたセラミック層保護膜と、該セラミック層保護膜上に形成された電極層と、該電極層上に形成された半田層と、を備え、
上記セラミック層は、窒化アルミニウムを用いたセラミック薄膜から構成され、
上記セラミック層保護膜は、上記電極層とは異なるチタン、白金、ニッケル、タングステン、モリブデン、銀、銅、鉄、アルミニウム、金の何れか又はこれらの金属を2種類以上含んでなり、上記電極層及び上記半田層のパターンを形成する際にエッチングにより上記セラミック層がエッチングされないよう、且つ、該セラミック層の表面粗さが大きくなるのを防止し、
上記半田層は、フラックス無しでハンダ接合をすることができる鉛を用いない半田層であることを特徴とする、金属−セラミック複合基板。 - 前記セラミック保護層を形成していない領域の前記セラミック層上に、さらに別の半田層が直接形成されたことを特徴とする、請求項1に記載の金属−セラミック複合基板。
- 前記セラミック層、前記セラミック層保護膜、前記電極層及び前記半田層は、前記金属基板の表面及び裏面の両面にそれぞれ積層されていることを特徴とする、請求項1に記載の金属−セラミック複合基板。
- 上記金属基板が、銅又はアルミニウムからなることを特徴とする、請求項1に記載の金属−セラミック複合基板。
- 上記半田層は、銀、金、銅、亜鉛、ニッケル、インジウム、ガリウム、ビスマス、アルミニウム、スズのうち、2種類以上の元素を含むことを特徴とする、請求項1に記載の金属−セラミック複合基板。
- 上記半田層は、金及びスズを含むことを特徴とする、請求項5に記載の金属−セラミック複合基板。
- 金属基板と、該金属基板上に形成されたセラミック層と、該セラミック層上に形成されたセラミック層保護膜と、該セラミック層保護膜上に形成された電極層と、該電極層上に形成された半田層と、から構成される金属−セラミック複合基板の製造方法であって、
上記金属基板の表面を研磨し、該金属基板の表面清浄化を行う工程と、
上記表面清浄化を行った金属基板の表面に、上記セラミック層として窒化アルミニウムを用いたセラミック薄膜を形成する工程と、
上記セラミック薄膜上の全面に、セラミック層保護膜を物理蒸着法により形成する工程と、
上記セラミック層保護膜上に所定のパターンの上記電極層と上記半田層とをリフトオフ法により形成する工程と、
上記所定のパターンの上記電極層と上記半田層とを形成した後で、該所定のパターンを形成しない領域の不要なセラミック層保護膜を除去する工程と、
を含み、
上記セラミック層保護膜を、上記電極層とは異なるチタン、白金、ニッケル、タングステン、モリブデン、銀、銅、鉄、アルミニウム、金の何れか又はこれらの金属を2種類以上含んで形成し、上記電極層及び上記半田層のパターンを形成する際にエッチングにより上記セラミック層がエッチングされないようにすると共に、該セラミック層の表面粗さが大きくなるのを防止し、
上記半田層を、フラックス無しでハンダ接合をすることができる鉛を用いない半田層とすることを特徴とする、金属−セラミック複合基板の製造方法。 - 前記セラミック保護層を形成していない領域の前記セラミック層上に、さらに別の半田層を直接形成する工程を含むことを特徴とする、請求項7に記載の金属−セラミック複合基板の製造方法。
- 前記セラミック層、前記セラミック層保護膜、前記電極層及び前記半田層を、前記金属基板の表面及び裏面の両面にそれぞれ形成することを特徴とする、請求項7に記載の金属−セラミック複合基板の製造方法。
- 上記半田層を、銀、金、銅、亜鉛、ニッケル、インジウム、ガリウム、ビスマス、アルミニウム、スズのうち、2種類以上の元素を含む組成とすることを特徴とする、請求項7〜9の何れかに記載の金属−セラミック複合基板の製造方法。
- 上記半田層を、金及びスズを含む組成とすることを特徴とする、請求項10に記載の金属−セラミック複合基板の製造方法。
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005166162A JP5413707B2 (ja) | 2005-06-06 | 2005-06-06 | 金属−セラミック複合基板及びその製造方法 |
TW095116195A TWI436436B (zh) | 2005-06-06 | 2006-05-08 | 金屬-陶瓷複合基板及其製造方法 |
PCT/JP2006/310328 WO2006132087A1 (ja) | 2005-06-06 | 2006-05-24 | 金属-セラミック複合基板及びその製造方法 |
EP06756534A EP1909321B1 (en) | 2005-06-06 | 2006-05-24 | Metal-ceramic composite substrate and method for manufacturing same |
EP10005899.9A EP2224479B1 (en) | 2005-06-06 | 2006-05-24 | Metal-ceramic composite substrate and method of its manufacture |
US11/916,816 US20090151982A1 (en) | 2005-06-06 | 2006-05-24 | Metal-ceramic composite substrate and method of its manufacture |
CN2006800278824A CN101233612B (zh) | 2005-06-06 | 2006-05-24 | 金属-陶瓷复合基板及其制造方法 |
KR1020077029130A KR100913762B1 (ko) | 2005-06-06 | 2007-12-13 | 금속-세라믹 복합 기판 및 그 제조 방법 |
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KR (1) | KR100913762B1 (ja) |
CN (1) | CN101233612B (ja) |
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CN101572993B (zh) * | 2008-04-29 | 2012-10-03 | 汉达精密电子(昆山)有限公司 | 绝缘导热金属基板上真空溅镀形成导电线路的方法 |
CN101572996B (zh) * | 2008-04-29 | 2011-12-07 | 汉达精密电子(昆山)有限公司 | 绝缘导热金属基板上真空溅镀形成导电线路的方法 |
CN101573001B (zh) * | 2008-04-29 | 2012-07-04 | 汉达精密电子(昆山)有限公司 | 绝缘导热金属基板上真空溅镀形成导电线路的方法 |
CN101572998B (zh) * | 2008-04-29 | 2012-07-18 | 汉达精密电子(昆山)有限公司 | 绝缘导热金属基板上真空溅镀形成导电线路的方法 |
CN102318093B (zh) * | 2009-02-13 | 2016-05-25 | 电化株式会社 | 用于led发光元件的复合材料基板、其制造方法及led发光元件 |
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CN102054713A (zh) * | 2010-09-26 | 2011-05-11 | 浙江大学 | 金属基氮化铝板绝缘基板制备方法 |
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CN103117335A (zh) * | 2011-11-16 | 2013-05-22 | 和淞科技股份有限公司 | 具有电路的复合式金属陶瓷基板的制法及其结构 |
JP6125527B2 (ja) * | 2012-11-06 | 2017-05-10 | 日本碍子株式会社 | 発光ダイオード用基板および発光ダイオード用基板の製造方法 |
JP6125528B2 (ja) * | 2012-11-06 | 2017-05-10 | 日本碍子株式会社 | 発光ダイオード用基板および発光ダイオード用基板の製造方法 |
CN104969372B (zh) * | 2013-02-06 | 2018-01-19 | 夏普株式会社 | 发光装置 |
CN103166103A (zh) * | 2013-03-18 | 2013-06-19 | 中国工程物理研究院应用电子学研究所 | 一种水电绝缘的半导体激光器线阵的封装方法 |
DE102014116529A1 (de) | 2014-11-12 | 2016-05-12 | Osram Opto Semiconductors Gmbh | Optoelektronisches Halbleiterbauteil und Verfahren zur Herstellung eines optoelektronischen Halbleiterbauteils |
JP6311887B2 (ja) * | 2015-05-15 | 2018-04-18 | 豊田合成株式会社 | 発光素子用基板および発光装置 |
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JP2018142569A (ja) * | 2017-02-27 | 2018-09-13 | 株式会社アカネ | 放熱基板 |
CN107708296A (zh) * | 2017-10-19 | 2018-02-16 | 深圳职业技术学院 | 一种高导热的金属基电路板及其制作方法 |
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- 2006-05-08 TW TW095116195A patent/TWI436436B/zh not_active IP Right Cessation
- 2006-05-24 US US11/916,816 patent/US20090151982A1/en not_active Abandoned
- 2006-05-24 CN CN2006800278824A patent/CN101233612B/zh not_active Expired - Fee Related
- 2006-05-24 WO PCT/JP2006/310328 patent/WO2006132087A1/ja active Application Filing
- 2006-05-24 EP EP10005899.9A patent/EP2224479B1/en not_active Ceased
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Also Published As
Publication number | Publication date |
---|---|
CN101233612B (zh) | 2013-09-25 |
KR20080014033A (ko) | 2008-02-13 |
CN101233612A (zh) | 2008-07-30 |
US20090151982A1 (en) | 2009-06-18 |
KR100913762B1 (ko) | 2009-08-25 |
TW200701375A (en) | 2007-01-01 |
EP1909321A4 (en) | 2009-09-23 |
EP2224479A3 (en) | 2010-10-06 |
WO2006132087A1 (ja) | 2006-12-14 |
JP2006339611A (ja) | 2006-12-14 |
EP1909321A1 (en) | 2008-04-09 |
EP2224479B1 (en) | 2016-05-11 |
EP1909321B1 (en) | 2011-08-17 |
EP2224479A2 (en) | 2010-09-01 |
TWI436436B (zh) | 2014-05-01 |
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