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JP2005272874A - Method for producing circuit board - Google Patents

Method for producing circuit board Download PDF

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JP2005272874A
JP2005272874A JP2004084522A JP2004084522A JP2005272874A JP 2005272874 A JP2005272874 A JP 2005272874A JP 2004084522 A JP2004084522 A JP 2004084522A JP 2004084522 A JP2004084522 A JP 2004084522A JP 2005272874 A JP2005272874 A JP 2005272874A
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circuit board
manufacturing
electroplating
conductor
board according
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Mikihiko Ishibashi
幹彦 石橋
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Sumitomo Bakelite Co Ltd
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Sumitomo Bakelite Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forming a projecting conductor bump having reduced variation in shape and height and reduced widening in the horizontal direction, by depositing the conductor bump in a short time by bottom up. <P>SOLUTION: In the method for producing a circuit board where a conductor bump is formed on a conductor circuit by electroplating, the forming rate in the vertical direction of the conductor bump to the forming rate in the horizontal direction is controlled to 2 to 10 times, and further, the current density of the electroplating is gradually increased, so as to form the conductor bump. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、回路基板の製造方法に関するものである。   The present invention relates to a circuit board manufacturing method.

近年、電子機器の小型化、高機能化に伴い、配線基板における細線化、ファインピッチ化、高密度実装化への要求が高まってきている。この要求に対し、特にめっき分野では、接続端子の微細化に対応する処理方法が求められており、狭ピッチ対応のマイクロバンプの形成方法や、高密度多層配線板の一括積層のための接続端子としてフィルドビア構造を持つバンプの形成方法が検討されている。   In recent years, with the miniaturization and high functionality of electronic devices, there has been an increasing demand for thinning, fine pitch, and high density mounting in wiring boards. In response to this requirement, particularly in the field of plating, there is a need for a processing method corresponding to the miniaturization of connection terminals. A method of forming micro bumps corresponding to narrow pitches and connection terminals for batch lamination of high-density multilayer wiring boards. A method for forming a bump having a filled via structure is being studied.

しかし、これらのバンプを銅めっきで形成する場合、従来のものは、電流密度が0.1〜3A/dm2が一般的で、このため、数百μm高さの高アスペクトのバンプ形成においては、1回の処理時間が1〜20時間かかっていた。このため、生産性が悪く実用上の問題があった。さらに、一般に用いられる硫酸銅めっき液は貫通スルーホール内にめっきのレベリング性のよい添加剤が使われており、これをバンプ形成に用いた場合、バンプのXY方向の析出が比較的大きいため、Z方向の所定のバンプ高さを得るために、バンプ径が広がってしまい、狭ピッチのバンプ形成に向いていなかった。さらに、これらのメッキにはパルスメッキなどの特殊な整流方法や、差圧噴流法、回転法、パドル法などの特別な液攪拌が必要とされ、生産する上で設備的、工数的制約を大きく受けていた。(例えば特許文献1)
特開平09−232734号公報
However, when these bumps are formed by copper plating, the conventional ones generally have a current density of 0.1 to 3 A / dm 2. For this reason, in the formation of high aspect bumps with a height of several hundred μm. One processing time was 1 to 20 hours. For this reason, productivity was poor and there was a problem in practical use. Furthermore, commonly used copper sulfate plating solutions use additives with good leveling properties in the through-holes, and when used for bump formation, the precipitation in the XY direction of the bumps is relatively large. In order to obtain a predetermined bump height in the Z direction, the bump diameter is widened, which is not suitable for forming a narrow pitch bump. Furthermore, special plating such as pulse plating and special liquid agitation such as the differential pressure jet method, rotation method, and paddle method are required for these platings, which greatly restricts equipment and man-hours in production. I was receiving. (For example, Patent Document 1)
Japanese Patent Laid-Open No. 09-232734

本発明は、生産性がよく、より微小化に適し、より品質の安定した銅バンプを形成するための回路基板の製造方法を提供するものである。   The present invention provides a method of manufacturing a circuit board for forming copper bumps with good productivity, suitable for miniaturization, and stable quality.

このような目的は、下記(1)〜(8)に記載の本発明により達成される。
(1)導体回路上に電気めっきによって導体バンプを形成する回路基板の製造方法であって、前記導体バンプの水平方向の形成速度に対して、垂直方向の形成速度が2〜10倍であることを特徴とする回路基板の製造方法。
(2)前記電気めっきの電流密度を、漸増して導体バンプを形成するものである上記(1)に記載の回路基板の製造方法。
(3)前記電流密度が、初期が1〜10A/dm2で、最終が10〜30A/dm2である上記(2)に記載の回路基板の製造方法。
(4)前記電気めっきは、直流電流で行うものである上記(1)ないし(3)のいずれかに記載の回路基板の製造方法。
(5)前記電気めっきの工程で、1〜20L/分の割合で直径1cm以下の気泡でエアー攪拌をおこなうことを特徴とする上記(1)ないし(4)のいずれかに記載の回路基板の製造方法。
(6)前記電気めっきの、めっき浴のめっき浴組成が硫酸銅濃度100〜160g/L、硫酸濃度100〜170g/L、塩素20〜80ppmを含むものである上記(1)ないし(5)のいずれかに記載の回路基板の製造方法。
(7)さらには、前記めっき浴に分子量1000〜30000の非イオン性ポリエーテル系成分を1〜10ml/Lと、アニオン性ジスルフィド系成分を0.1〜3ml/Lと、カチオン性アンモニウム系成分を1〜10ml/Lとを含むものである上記(6)に記載の回路基板の製造方法。
(8)さらには、前記めっき浴のめっき浴温が25〜45℃である上記(6)または(7)に記載の回路基板の製造方法。
Such an object is achieved by the present invention described in the following (1) to (8).
(1) A method of manufacturing a circuit board in which conductor bumps are formed on a conductor circuit by electroplating, wherein the formation speed in the vertical direction is 2 to 10 times the horizontal formation speed of the conductor bumps. A method of manufacturing a circuit board characterized by the above.
(2) The method for manufacturing a circuit board according to (1), wherein the current density of the electroplating is gradually increased to form a conductor bump.
(3) the current density, the initial stage at 1 to 10 A / dm 2, a manufacturing method of a circuit board according to the final is 10~30A / dm 2 (2).
(4) The method for manufacturing a circuit board according to any one of (1) to (3), wherein the electroplating is performed with a direct current.
(5) The circuit board according to any one of (1) to (4), wherein in the electroplating step, air agitation is performed with bubbles having a diameter of 1 cm or less at a rate of 1 to 20 L / min. Production method.
(6) Any one of the above (1) to (5), wherein the plating bath composition of the electroplating contains a copper sulfate concentration of 100 to 160 g / L, a sulfuric acid concentration of 100 to 170 g / L, and chlorine of 20 to 80 ppm. A method for producing a circuit board according to claim 1.
(7) Furthermore, a nonionic polyether component having a molecular weight of 1000 to 30000, 1 to 10 ml / L, an anionic disulfide component to 0.1 to 3 ml / L, and a cationic ammonium component in the plating bath. The manufacturing method of the circuit board as described in said (6) which contains 1-10 ml / L.
(8) Furthermore, the method for manufacturing a circuit board according to (6) or (7), wherein the plating bath temperature of the plating bath is 25 to 45 ° C.

本発明により、生産性が高く、高さばらつきが少なく、バンプ径の広がりが少ない微小銅バンプを作成する回路基板の製造方法を提供することができる。   According to the present invention, it is possible to provide a circuit board manufacturing method for producing a fine copper bump with high productivity, small height variation, and small bump diameter spread.

以下、本発明の実施形態について、詳細に説明するが、本発明はこれに何ら限定されるものではない。   Hereinafter, although an embodiment of the present invention is described in detail, the present invention is not limited to this at all.

本発明の、回路基板の製造方法では、絶縁層で囲われた導体回路上に電気めっきでボトムアップにより導体バンプを形成する際、絶縁層表層より突出した導体バンプは水平方向の形成速度に対して、垂直方向の形成速度が2〜10倍となる。これは以下の方法によって得ることができる。   In the method for manufacturing a circuit board according to the present invention, when a conductor bump is formed by bottom-up by electroplating on a conductor circuit surrounded by an insulating layer, the conductor bump protruding from the surface layer of the insulating layer has a horizontal formation speed. Thus, the formation speed in the vertical direction is 2 to 10 times. This can be obtained by the following method.

電気めっきの際、めっきの電流密度を初期の電流密度より漸増させつつめっき析出をおこなう。このときの電流密度の水準は2種類以上あればよく、特に限定されないが、必要な導体バンプ高さや径にあわせ、特に高アスペクトになるほど多くすることが望ましい。そして、各電流密度水準での処理時間は少なくとも0.5μm以上めっき析出させることが望ましい。   During electroplating, plating deposition is performed while gradually increasing the plating current density from the initial current density. There are no particular limitations on the level of current density at this time, and there are no particular limitations. However, it is desirable that the current density be increased as the aspect ratio increases in accordance with the required height and diameter of the conductor bumps. And, it is desirable that the processing time at each current density level is at least 0.5 μm or more.

また、このとき、初期の電流密度は1〜10A/dm2の中から選ばれ、選ばれた電流密度から漸増して、最終の電流密度は10〜30A/dm2となるようにする。このとき、漸増する電流密度や処理時間は等間隔、等増率にする必要はなく、必要な導体バンプ高さや導体バンプ径にあわせ、高アスペクトになるほど初期電流密度を低く取り漸増間隔を狭く、低アスペクトになるほど初期電流密度を高めに漸増間隔を広くしてやればよい。 At this time, the initial current density is selected from 1 to 10 A / dm 2 , and gradually increases from the selected current density so that the final current density is 10 to 30 A / dm 2 . At this time, the increasing current density and processing time do not need to be equal intervals, equal increase rate, according to the required conductor bump height and conductor bump diameter, the higher the aspect, the lower the initial current density and the gradually increasing interval, The lower the aspect, the higher the initial current density and the wider the increment interval.

また、これらの電流密度は一般の直流電流でよい。特に微小導体バンプに対するめっきに対しては、極微量な電流制御がおこなえる直流電源を用意する。このとき被めっき物は導体バンプを形成する部分以外は全てめっきレジストで保護してあることが望ましい。   These current densities may be general DC currents. In particular, a direct current power source capable of controlling a very small amount of current is prepared for plating on a minute conductor bump. At this time, it is desirable that the object to be plated is protected by the plating resist except for the portion where the conductor bump is formed.

次に、この電気めっきの際におこなわれる液攪拌はエアー攪拌を用いるとより簡便であり、風量1〜20L/分、望ましくは8L/分で処理されることが望ましい。このとき、エアーバブリングの気泡は液の均一な対流を促すため直径1cm以下、好ましくは1mm以下に調整される。そして陽極と陰極の間に設置され、好ましくは被めっき物から1〜10cm離れた位置に被めっき物全体をカバーするように配置されることが望ましい。   Next, the liquid agitation performed during the electroplating is simpler if air agitation is used, and the air volume is 1 to 20 L / min, preferably 8 L / min. At this time, the air bubbling bubbles are adjusted to a diameter of 1 cm or less, preferably 1 mm or less in order to promote uniform convection of the liquid. And it is installed between an anode and a cathode, It is desirable to arrange | position so that it may cover the whole to-be-plated object preferably in the position 1-10 cm away from the to-be-plated object.

さらに、使用するめっき液は硫酸銅浴であり、無機組成は硫酸銅、硫酸、塩素からなる。ここで硫酸銅濃度は100〜160g/L、硫酸濃度は100〜170g/L、塩素20〜80ppmが好ましく、さらに硫酸銅130g/L、硫酸135g/L、塩素50ppmであることが好ましい。さらに、めっき添加剤としては、特に指定されるものではなく、高電流密度に対応したもので、抑制剤、促進剤、レベリング剤の3成分からなり、抑制剤は分子量1000〜30000の非イオン性ポリエーテル系の高分子化合物。促進剤はアニオン性のジスルフィド系のイオウ化合物。レベリング剤はカチオン性アンモニウム系の窒素化合物であることが望ましい。   Further, the plating solution used is a copper sulfate bath, and the inorganic composition is composed of copper sulfate, sulfuric acid, and chlorine. Here, the copper sulfate concentration is preferably 100 to 160 g / L, the sulfuric acid concentration is preferably 100 to 170 g / L, and chlorine 20 to 80 ppm, and further preferably copper sulfate 130 g / L, sulfuric acid 135 g / L, and chlorine 50 ppm. Further, the plating additive is not particularly specified, and corresponds to a high current density, and is composed of three components, an inhibitor, an accelerator, and a leveling agent, and the inhibitor is a nonionic having a molecular weight of 1000 to 30000. Polyether-based polymer compound. The accelerator is an anionic disulfide sulfur compound. The leveling agent is preferably a cationic ammonium-based nitrogen compound.

また、これらのめっき液の浴温は25〜40℃であり、より高電流域のめっき析出や光沢を安定させるためには40℃に設定されることが望ましい。   Moreover, the bath temperature of these plating solutions is 25-40 degreeC, and in order to stabilize the plating precipitation and glossiness of a higher electric current range, it is desirable to set to 40 degreeC.

このような方法でえられた導体バンプは、導体回路面に対して垂直なZ方向に優先的にめっきが析出し、導体回路面に対して水平なXY方向の析出が比較的小さいため、導体バンプが絶縁層表面までめっき析出したときに、径が小さくより突出した高さの均一な導体バンプの形状となる。たとえば40μm高さの導体バンプを形成する場合、3A/dm2で1μm、次に5A/dm2で4μm、更に10A/dm2で5μmと段階的に電流を上昇させながらバンプを形成していき、最終的に20A/dm2で20μm処理することにより、微小径、高アスペクト比の導体バンプであっても、約13.2分で、高さばらつき、コゲ、ボイド、異常析出の少ない良好なバンプを効率よく形成することができる。 The conductor bumps obtained in this way are preferentially deposited in the Z direction perpendicular to the conductor circuit surface, and the deposition in the XY direction horizontal to the conductor circuit surface is relatively small. When the bumps are deposited to the surface of the insulating layer, the shape of the conductor bumps having a small diameter and a more protruding height is obtained. For example, when forming a 40 μm high conductor bump, the bump is formed while increasing the current stepwise from 1 μm at 3 A / dm 2 , then 4 μm at 5 A / dm 2 , and further 5 μm at 10 A / dm 2 . Finally, by processing 20 μm at 20 A / dm 2 , even in the case of a conductor bump with a small diameter and a high aspect ratio, the height variation, kogation, voids, and abnormal precipitation are good in about 13.2 minutes. Bumps can be formed efficiently.

さらに、この方法で得られる導体バンプを絶縁層表層上に突出させた場合、絶縁層表層上の導体バンプは絶縁層面に対して平行なXY方向の析出に対して、絶縁層面に垂直なZ方向の析出が2〜10倍の割合で大きい。これによって、導体バンプ径の広がりが小さく、より突出した導体バンプを絶縁層表層上に形成することができる。   Furthermore, when the conductor bump obtained by this method is projected on the surface of the insulating layer, the conductor bump on the surface of the insulating layer is in the Z direction perpendicular to the surface of the insulating layer with respect to precipitation in the XY direction parallel to the surface of the insulating layer. Is large at a rate of 2 to 10 times. As a result, the conductor bump diameter is small and a more protruding conductor bump can be formed on the surface of the insulating layer.

銅箔18μm、ポリイミド25μmの片面フレキシブル銅張板にUVレーザーでポリイミドを除去しトップ径φ50μm、ボトム径φ40μmのブラインドビアを形成したものに、硫酸銅濃度130g/L、硫酸濃度243g/L、塩素50ppm、抑制剤5ml/L、促進剤1ml/L、レベリング剤5ml/Lの硫酸銅メッキを浴温40℃、エアー攪拌8L/分の状態で、銅箔面側をマスキングし、めっき処理電流条件を5A/dm2で5μm、10A/dm2で5μm、15A/dm2で5μm、20A/dm2で20μmと段階的に処理し、ポリイミド表層にバンプメッキを形成した。 A single-sided flexible copper-clad plate with 18 μm copper foil and 25 μm polyimide, with polyimide removed by UV laser to form blind vias with a top diameter of 50 μm and a bottom diameter of 40 μm, has a copper sulfate concentration of 130 g / L, a sulfuric acid concentration of 243 g / L, chlorine 50ppm, inhibitor 5ml / L, accelerator 1ml / L, leveling agent 5ml / L copper sulfate plating at a bath temperature of 40 ° C and air agitation at 8L / min. the 5A / dm 2 at 5 [mu] m, 10A / dm 2 at 5 [mu] m, 15A / dm 2 at 5 [mu] m, 20A / dm 2 in treated 20μm stepwise, to form a bump plating the polyimide surface.

形成された銅バンプはポリイミド面から平均高さ17μm、平均直径φ58μmの突出したドーム状の銅バンプであり、高さばらつきはσ=0.8μm、直径ばらつきはσ=1.9μmであった。   The formed copper bumps were dome-shaped copper bumps protruding from the polyimide surface with an average height of 17 μm and an average diameter φ of 58 μm. The height variation was σ = 0.8 μm and the diameter variation was σ = 1.9 μm.

また、このバンプの径と高さの関係から、水平方向の析出めっきの広がりが(58−50)÷2=4μmに対し、垂直方向のめっきの析出が17μmであるため、水平方向に対する垂直方向の析出速度が17÷4≒4倍であることがわかる。   In addition, from the relationship between the diameter and height of the bumps, the horizontal plating plating spread is (58-50) / 2 = 4 μm, whereas the vertical plating deposition is 17 μm. It can be seen that the precipitation rate of is 17 ÷ 4≈4 times.

本発明は、電子機器の部品として用いられる配線回路のマイクロバンプ形成用のめっき液に関するものである。   The present invention relates to a plating solution for forming micro bumps of a wiring circuit used as a component of an electronic device.

Claims (8)

導体回路上に電気めっきによって導体バンプを形成する回路基板の製造方法であって、前記導体バンプの水平方向の形成速度に対して、垂直方向の形成速度が2〜10倍であることを特徴とする回路基板の製造方法。   A method of manufacturing a circuit board in which conductor bumps are formed on a conductor circuit by electroplating, wherein the formation speed in the vertical direction is 2 to 10 times the horizontal formation speed of the conductor bumps. Circuit board manufacturing method. 前記電気めっきの電流密度を、漸増して導体バンプを形成するものである請求項1に記載の回路基板の製造方法。   The method for manufacturing a circuit board according to claim 1, wherein the current density of the electroplating is gradually increased to form a conductor bump. 前記電流密度が、初期が1〜10A/dm2で、最終が10〜30A/dm2である請求項2に記載の回路基板の製造方法。 The method for manufacturing a circuit board according to claim 2 , wherein the current density is 1 to 10 A / dm 2 in an initial stage and 10 to 30 A / dm 2 in a final stage. 前記電気めっきは、直流電流で行うものである請求項1ないし3のいずれかに記載の回路基板の製造方法。   The method of manufacturing a circuit board according to claim 1, wherein the electroplating is performed with a direct current. 前記電気めっきの工程で、1〜20L/分の割合で直径1cm以下の気泡でエアー攪拌をおこなうことを特徴とする請求項1ないし4に記載の回路基板の製造方法。   5. The method of manufacturing a circuit board according to claim 1, wherein in the electroplating step, air agitation is performed with bubbles having a diameter of 1 cm or less at a rate of 1 to 20 L / min. 前記電気めっきの、めっき浴のめっき浴組成が硫酸銅濃度100〜160g/L、硫酸濃度100〜170g/L、塩素20〜80ppmを含むものである請求項1ないし5のいずれかに記載の回路基板の製造方法。   The circuit board according to any one of claims 1 to 5, wherein a plating bath composition of the electroplating bath includes a copper sulfate concentration of 100 to 160 g / L, a sulfuric acid concentration of 100 to 170 g / L, and chlorine of 20 to 80 ppm. Production method. さらには、前記めっき浴に分子量1000〜30000の非イオン性ポリエーテル系成分を1〜10ml/Lと、アニオン性ジスルフィド系成分を0.1〜3ml/Lと、カチオン性アンモニウム系成分を1〜10ml/Lとを含むものである請求項6に記載の回路基板の製造方法。   Furthermore, 1-10 ml / L of a nonionic polyether component having a molecular weight of 1000 to 30000, 0.1-3 ml / L of an anionic disulfide component, and 1 to 1 of a cationic ammonium component in the plating bath. The method for producing a circuit board according to claim 6, comprising 10 ml / L. さらには、前記めっき浴のめっき浴温が25〜45℃である請求項6または7に記載の回路基板の製造方法。   Furthermore, the manufacturing method of the circuit board of Claim 6 or 7 whose plating bath temperature of the said plating bath is 25-45 degreeC.
JP2004084522A 2004-03-23 2004-03-23 Method for producing circuit board Pending JP2005272874A (en)

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JP2009102674A (en) * 2007-10-22 2009-05-14 Ebara Corp Plating method and plating apparatus
JP2012122097A (en) * 2010-12-08 2012-06-28 Ebara Corp Electroplating method
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JP2017036501A (en) * 2015-08-06 2017-02-16 ローム アンド ハース エレクトロニック マテリアルズ エルエルシーRohm and Haas Electronic Materials LLC Method for electroplating photoresist defining features from an electrocopper plating bath containing a reaction product of an alpha amino acid and a bisepoxide
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JP2009102674A (en) * 2007-10-22 2009-05-14 Ebara Corp Plating method and plating apparatus
JP2012122097A (en) * 2010-12-08 2012-06-28 Ebara Corp Electroplating method
US9006580B2 (en) 2011-06-09 2015-04-14 Ngk Spark Plug Co., Ltd. Method of manufacturing multilayer wiring substrate, and multilayer wiring substrate
JPWO2015162775A1 (en) * 2014-04-25 2017-04-13 株式会社Jcu High speed copper filling method
JP2017036501A (en) * 2015-08-06 2017-02-16 ローム アンド ハース エレクトロニック マテリアルズ エルエルシーRohm and Haas Electronic Materials LLC Method for electroplating photoresist defining features from an electrocopper plating bath containing a reaction product of an alpha amino acid and a bisepoxide

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