JP5944530B2 - 接合方法およびそれに用いられる接合装置 - Google Patents
接合方法およびそれに用いられる接合装置 Download PDFInfo
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- JP5944530B2 JP5944530B2 JP2014551483A JP2014551483A JP5944530B2 JP 5944530 B2 JP5944530 B2 JP 5944530B2 JP 2014551483 A JP2014551483 A JP 2014551483A JP 2014551483 A JP2014551483 A JP 2014551483A JP 5944530 B2 JP5944530 B2 JP 5944530B2
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- plasma
- processing unit
- bonding
- heat treatment
- preheating
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- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/83053—Bonding environment
- H01L2224/83095—Temperature settings
- H01L2224/83096—Transient conditions
- H01L2224/83097—Heating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/838—Bonding techniques
- H01L2224/8384—Sintering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/93—Batch processes
- H01L2224/95—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips
- H01L2224/97—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/09—Treatments involving charged particles
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- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
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Description
すなわち、導電性ペーストには、金や銀や銅やその酸化物の微粒子を溶かすための溶剤や、金や銀や銅やその酸化物の微粒子を分散させるための分散剤が含まれている。金や銀や銅やその酸化物の微粒子を焼結させるために加熱を行うと有機成分(溶剤および分散剤)が気化して、導電性ペーストに空隙が生じて、無加圧接合程度の圧力では残る空隙が大きく疎な接合層が形成されるので接合能力が低いことが判明した。そこで、上述の特許文献3に着目して、加熱処理と真空処理とを組み合わせた複合加熱の場合には、緻密な接合層を形成することができ、無加圧接合でも接合能力が高くなるという発想に至った。
すなわち、本発明に係る接合方法は、金属または金属酸化物の微粒子からなる、有機成分を有する導電ペーストを焼結させて被処理物に対して接合処理を行う接合方法であって、前記微粒子からなる前記導電ペーストを介在させた前記被処理物に対して予備加熱処理を行う予備加熱処理過程と、当該予備加熱処理過程の後で、減圧下で前記被処理物に対してプラズマ照射を断続的に行ってプラズマ処理を行うプラズマ処理過程とを備えることで、前記微粒子からなる前記導電ペーストを焼結させて前記被処理物に対して接合処理を行うことを特徴とするものである。
また、本発明に係る接合装置によれば、上述した本発明に係る接合方法を好適に実施することができる。
大気圧になっていない場合には、先ず、供給管8を通してチャンバー1内に空気を常圧に達するまで供給する。既に、大気圧の状態になっている場合には、空気を供給する必要はない。大気圧の状態でサーキュレータ3から金属配管4にオイルを流すことで、大気圧下で低温に加熱する。ステージ2の温度は60℃〜100℃である。大気圧下で加熱することにより、大気圧下で熱を均一に分布させる。
大気圧の状態でステージ2の温度を60℃〜100℃の低温に保ち続けた状態で、導電性ペーストPを介在させた半導体チップCおよびフレームFをステージ2に載置する。
大気圧の状態でステージ2の温度を60℃〜100℃の低温に保ち続けた状態で、導電性ペーストPを介在させた半導体チップCおよびフレームFをステージ2に載置すると、大気圧下で半導体チップCおよびフレームFに対して予備加熱処理を行う。この予備加熱処理を行うことで導電性ペーストPに含まれる有機成分(溶剤や分散剤)を低温で徐々に抜く。この予備加熱処理によって、導電性ペーストPからなる接合層と半導体チップCおよびフレームFとの界面でのボイドをなくす。このステップS3は、本発明における予備加熱処理過程に相当する。
チャンバー1の内部を真空ポンプ10により排気管9を用いて減圧した後に、ステージ2の温度を100℃〜150℃に昇温して、供給管8を通してチャンバー1内に水素を供給する。そして、導波管5を介して2.45GHzのマイクロ波を伝送し、スロットアンテナ6および石英管7を介してマイクロ波により水素プラズマを励起し、半導体チップCおよびフレームFに水素プラズマを照射することによりプラズマ処理を行う。
チャンバー1の内部を真空ポンプ10により排気管9を用いて水素を除去する。水素を除去した後に、供給管8を通してチャンバー1内に空気を常圧に達するまで供給して大気圧の状態にするとともに、ステージ2の温度を200℃〜300℃に昇温する。そして、大気圧下で半導体チップCおよびフレームFに対して本加熱処理を行う。この本加熱処理によって、接着剤に残留する分散剤を揮発させ、微粒子の固相拡散接合を進展させる。これにより無加圧でも緻密な接合層を実現することができる。このステップS5は、本発明における本加熱処理過程に相当する。
大気圧の状態を保ったまま、半導体チップCおよびフレームFを徐々に冷却する。昇温と同様に、サーキュレータ3から金属配管4にオイルを流すことで、大気圧下で徐々に降温することにより冷却する。ステージ2をステップS5の200℃〜300℃から徐々に下げていって150℃以下にする。例えば冷却速度5℃/分で冷却すればよい。もちろん、冷却速度は上記に限定されない。材料に応じて適宜変えればよい。
以下の条件で実験結果を行って観察を行った。ベース基板(実装基板)は、銀(Ag)をメッキした銅板を使用し、サイズは20mm四方×厚み0.8mmである。チップは、チタン(Ti),ニッケル(Ni),銀の順にメッキした銅片もしくはチタン,ニッケル,銀の順にメタライズしたSiCを使用し、サイズは5mm四方である。接合材(ペースト)は、市販品の焼結銀ペースト(酸素燃焼タイプ,推奨焼成条件は200℃で1時間)を使用した。塗布はディスペンサで行い、実装は荷重制御が可能な実装機を使用した。
3 … サーキュレータ(circulator)
C … 半導体チップ
F … フレーム
P … 導電性ペースト
PM … プラズマ
Claims (13)
- 金属または金属酸化物の微粒子からなる、有機成分を有する導電ペーストを焼結させて被処理物に対して接合処理を行う接合方法であって、
前記微粒子からなる前記導電ペーストを介在させた前記被処理物に対して予備加熱処理を行う予備加熱処理過程と、
当該予備加熱処理過程の後で、減圧下で前記被処理物に対してプラズマ照射を断続的に行ってプラズマ処理を行うプラズマ処理過程と
を備えることで、前記微粒子からなる前記導電ペーストを焼結させて前記被処理物に対して接合処理を行うことを特徴とする接合方法。 - 請求項1に記載の接合方法において、
前記プラズマ処理過程の後で、前記被処理物に対して本加熱処理を行う本加熱処理過程を備えることを特徴とする接合方法。 - 請求項1に記載の接合方法において、
前記プラズマ処理過程の後で、前記被処理物に対して冷却処理を行う冷却処理過程を備えることを特徴とする接合方法。 - 請求項1に記載の接合方法において、
前記プラズマ処理過程の後で、前記被処理物に対して本加熱処理を行う本加熱処理過程と、
当該本加熱処理過程の後で、前記被処理物に対して冷却処理を行う冷却処理過程と
を備えることを特徴とする接合方法。 - 金属または金属酸化物の微粒子からなる、有機成分を有する導電ペーストを焼結させて被処理物に対して接合処理を行う接合方法に用いられる接合装置であって、
前記微粒子からなる前記導電ペーストを介在させた前記被処理物に対して予備加熱処理を行う予備加熱処理部と、
当該予備加熱処理部における予備加熱処理の後で、減圧下で前記被処理物に対してプラズマ照射を断続的に行ってプラズマ処理を行うプラズマ処理部と
を備えることで、前記微粒子からなる前記導電ペーストを焼結させて前記被処理物に対して接合処理を行うことを特徴とする接合装置。 - 請求項5に記載の接合装置において、
前記プラズマ処理部におけるプラズマ処理の後で、前記被処理物に対して本加熱処理を行う本加熱処理部を備えることを特徴とする接合装置。 - 請求項5に記載の接合装置において、
前記プラズマ処理部におけるプラズマ処理の後で、前記被処理物に対して冷却処理を行う冷却処理部を備えることを特徴とする接合装置。 - 請求項5に記載の接合装置において、
前記プラズマ処理部におけるプラズマ処理の後で、前記被処理物に対して本加熱処理を行う本加熱処理部と、
当該本加熱処理部における本加熱処理の後で、前記被処理物に対して冷却処理を行う冷却処理部と
を備えることを特徴とする接合装置。 - 請求項5に記載の接合装置において、
前記予備加熱処理部および前記プラズマ処理部を同一のチャンバーで構成することを特徴とする接合装置。 - 請求項6に記載の接合装置において、
前記予備加熱処理部,前記プラズマ処理部および前記本加熱処理部を同一のチャンバーで構成することを特徴とする接合装置。 - 請求項7に記載の接合装置において、
前記予備加熱処理部,前記プラズマ処理部および前記冷却処理部を同一のチャンバーで構成することを特徴とする接合装置。 - 請求項8に記載の接合装置において、
前記予備加熱処理部,前記プラズマ処理部,前記本加熱処理部および前記冷却処理部を同一のチャンバーで構成することを特徴とする接合装置。 - 請求項11または請求項12に記載の接合装置において、
温度制御を行う媒体を循環させて前記チャンバーの温度を制御するサーキュレータを備えることを特徴とする接合装置。
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JP2010219076A (ja) * | 2009-03-12 | 2010-09-30 | Dainippon Printing Co Ltd | 導電性基板の製造方法及び導電性基板 |
JP2011047003A (ja) * | 2009-08-27 | 2011-03-10 | Toray Ind Inc | 銅膜の製造方法 |
JP2013128144A (ja) * | 2010-12-16 | 2013-06-27 | Nisshin:Kk | 加熱処理方法およびその装置 |
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JP2010219076A (ja) * | 2009-03-12 | 2010-09-30 | Dainippon Printing Co Ltd | 導電性基板の製造方法及び導電性基板 |
JP2011047003A (ja) * | 2009-08-27 | 2011-03-10 | Toray Ind Inc | 銅膜の製造方法 |
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