JP6641717B2 - 多層配線基板の製造方法 - Google Patents
多層配線基板の製造方法 Download PDFInfo
- Publication number
- JP6641717B2 JP6641717B2 JP2015079257A JP2015079257A JP6641717B2 JP 6641717 B2 JP6641717 B2 JP 6641717B2 JP 2015079257 A JP2015079257 A JP 2015079257A JP 2015079257 A JP2015079257 A JP 2015079257A JP 6641717 B2 JP6641717 B2 JP 6641717B2
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- Prior art keywords
- hole
- plating
- filled
- electrolytic
- current density
- Prior art date
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/60—Electroplating characterised by the structure or texture of the layers
- C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
- C25D5/611—Smooth layers
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1633—Process of electroless plating
- C23C18/1646—Characteristics of the product obtained
- C23C18/165—Multilayered product
- C23C18/1653—Two or more layers with at least one layer obtained by electroless plating and one layer obtained by electroplating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/28—Sensitising or activating
- C23C18/30—Activating or accelerating or sensitising with palladium or other noble metal
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/38—Coating with copper
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/12—Process control or regulation
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0011—Working of insulating substrates or insulating layers
- H05K3/0017—Etching of the substrate by chemical or physical means
- H05K3/0026—Etching of the substrate by chemical or physical means by laser ablation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/4038—Through-connections; Vertical interconnect access [VIA] connections
- H05K3/4076—Through-connections; Vertical interconnect access [VIA] connections by thin-film techniques
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/42—Plated through-holes or plated via connections
- H05K3/423—Plated through-holes or plated via connections characterised by electroplating method
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4644—Manufacturing multilayer circuits by building the multilayer layer by layer, i.e. build-up multilayer circuits
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/38—Electroplating: Baths therefor from solutions of copper
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- 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
- H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
- H05K2203/0703—Plating
- H05K2203/0723—Electroplating, e.g. finish plating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- 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
- H05K2203/10—Using electric, magnetic and electromagnetic fields; Using laser light
- H05K2203/107—Using laser light
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- 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
- H05K2203/14—Related to the order of processing steps
- H05K2203/1476—Same or similar kind of process performed in phases, e.g. coarse patterning followed by fine patterning
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0011—Working of insulating substrates or insulating layers
- H05K3/0017—Etching of the substrate by chemical or physical means
- H05K3/0026—Etching of the substrate by chemical or physical means by laser ablation
- H05K3/0032—Etching of the substrate by chemical or physical means by laser ablation of organic insulating material
- H05K3/0038—Etching of the substrate by chemical or physical means by laser ablation of organic insulating material combined with laser drilling through a metal layer
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/42—Plated through-holes or plated via connections
- H05K3/425—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern
- H05K3/427—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern initial plating of through-holes in metal-clad substrates
Description
1. 絶縁層の両側に金属箔を積層一体化した金属箔張り積層板に対し、コンフォーマル工法又はダイレクトレーザ工法を用いて、前記絶縁層両側の金属箔及び絶縁層を貫通するスルーホール用穴と、このスルーホール用穴の開口部に形成される絶縁層両側の金属箔の飛び出しと、この金属箔の飛び出しと前記スルーホール用穴の内壁との間に形成される下方空間と、を設ける工程(1)と、前記スルーホール用穴内及び絶縁層両側の金属箔上に、電解フィルドめっき層を形成することによって前記スルーホール用穴を穴埋めし、前記絶縁層両側の金属箔同士を電気的に接続するスルーホールを形成する工程(2)と、前記電解フィルドめっき層を形成後の絶縁層両側の金属箔を回路加工して配線を形成する工程(3)と、を有する多層配線基板の製造方法であって、前記工程(2)における、電解フィルドめっき層の形成によるスルーホール用穴の穴埋めが、電解フィルドめっきの電流密度を電解フィルドめっきの途中で一旦低下させ、再び増加させて行われる多層配線基板の製造方法。
2. 前記工程(2)における、電解フィルドめっきの電流密度を一旦低下させるタイミングが、スルーホールの断面形状が、スルーホール用穴の開口部に形成された絶縁層両側の金属箔の飛び出しと前記スルーホール用穴の内壁との間の下方空間を電解フィルドめっき層が充填した時点以降である項1に記載の多層配線基板の製造方法。
3. 前記工程(2)における、電解フィルドめっきの電流密度を一旦低下させるタイミングが、スルーホール用穴の開口部に形成された絶縁層両側の金属箔の飛び出しと前記スルーホール用穴の内壁との間の下方空間を電解フィルドめっき層が充填し、かつ、めっきボイドが形成される前である項1又は2に記載の多層配線基板の製造方法。
4. 前記工程(2)における、電解フィルドめっきの電流密度を電解フィルドめっきの途中で一旦低下させる際の電流密度の低下率が、低下させる直前の50%以上である項1から3の何れか一項に記載の多層配線基板の製造方法。
5. 前記工程(2)における、電解フィルドめっきの電流密度を電解フィルドめっきの途中で一旦低下させた後、再び増加させる際の電流密度が、前記一旦低下させる直前の電流密度以上である項1から4の何れか一項に記載の多層配線基板の製造方法。
まず、図1の工程(1−1)に示すように絶縁層3の両側に配線10用の銅箔4を積層一体化した銅箔張り積層板(厚さ0.11mm)を準備した。次に、この銅箔4の表面に、厚さ0.3〜0.5μmの黒化処理層(図示しない。)を形成した後、図1の工程(1−2)に示すように、CO2レーザによるダイレクトレーザ工法により、直径60μmのスルーホール用穴5を加工した。スルーホール用穴のアスペクト比は、約1.8であった。スルーホール用穴5の開口部に銅箔4の飛び出し12が生じ、この銅箔4の飛び出し12とスルーホール用穴5の内壁18との間に下方空間13が形成した。銅箔4の飛び出し量は、スルーホール用穴5の片側で約8μmであった。また、配線10用の銅箔4の飛び出し12とスルーホール用穴5の内壁との間に形成される下方空間13の中でも、配線10用の銅箔4の飛び出し12の裏面近傍の領域には、直下部17が形成した。
実施例1と同様にして、図1の工程(1−1)〜、図2の工程(2−1)までを進めた。次に、図2の工程(2−2)に示すように、銅箔4上の厚さとしては2μm、スルーホール用穴5内中央部の厚さとして2〜5μmの一段目の電解フィルド銅めっき層7を形成する。電解フィルド銅めっき液には、実施例1と同じものを用いた。このときの一段目の電解フィルド銅めっきの条件は、1.0A/dm2の電流密度で、約8分であった。
実施例1と同様にして、図1の工程(1−1)〜、図2の工程(2−1)までを進めた。次に、図2の工程(2−2)に示すように、銅箔4上の厚さとしては2μm、スルーホール用穴5内中央部の厚さとして2〜5μmの一段目の電解フィルド銅めっき層7を形成する。電解めっき液には、実施例1と同じものを用いた。このときの一段目の電解フィルド銅めっきの条件は、1.0A/dm2の電流密度で、約8分であった。
実施例1と同様にして、図1の工程(1−1)〜、図2の工程(2−1)までを進めた。次に、図2の工程(2−2)に示すように、銅箔4上の厚さとしては2μm、スルーホール用穴5内中央部の厚さとして2〜5μmの一段目の電解フィルド銅めっき層7を形成する。電解めっき液には、実施例1と同じものを用いた。このとき、一段目の電解フィルド銅めっきの条件は、1.0A/dm2の電流密度で、約8分であった。
実施例1と同様にして、図1の工程(1−1)〜、図2の工程(2−1)までを進めた。次に、図2の工程(2−2)に示すように、銅箔4上の厚さとしては1μm、スルーホール用穴5内中央部の厚さとして1〜7μmの一段目の電解フィルド銅めっき層7を形成する。電解フィルドめっき液には、実施例1と同じものを用いた。このとき、一段目の電解フィルド銅めっきの条件は、1.0A/dm2の電流密度で、約4分であった。
実施例1と同様にして、図1の工程(1−1)〜、図2の工程(2−1)までを進めた。次に、図4の工程(2−2)に示すように、銅箔4上の厚さとしては0.5μm、スルーホール用穴5内中央部の厚さとして0.5〜3μmの一段目の電解フィルド銅めっき層7を形成する。電解フィルド銅めっき液には、実施例1と同じものを用いた。このとき、一段目の電解フィルド銅めっきの条件は、1.0A/dm2の電流密度で、約2分であった。このとき、一段目の電解フィルド銅めっき層7を形成したスルーホール15の断面形状は、一段目の電解フィルド銅めっき層7が下方空間13を充填しておらず、直下部17の電解フィルド銅めっき層7の表面は、スルーホール用穴5内中央部よりもへこんでいる状態であった。
実施例1と同様にして、図1の工程(1−1)〜、図2の工程(2−1)までを進めた。次に、図5の工程(2−2)に示すように、銅箔4上の厚さとしては25μmの一段目の電解フィルド銅めっき層7を、1段階で形成した。電解フィルド銅めっき液には、実施例1と同じものを用いた。このとき、一段目の電解フィルド銅めっきの条件は、1.0A/dm2の電流密度で、約108分であった。次に、実施例1と同様にして、図3の工程(3)までを進めた。
4.金属箔又は銅箔
5.スルーホール用穴
7.一段目の電解フィルドめっき層又は一段目の電解フィルド銅めっき層
9.二段目の電解フィルドめっき層又は二段目の電解フィルド銅めっき層
10.配線
12.金属箔の飛び出し
13.下方空間
15.スルーホール又は層間接続
16.ボイド
17.直下部
18.内壁
22.金属箔張り積層板又は銅箔張り積層板
23.多層配線基板
Claims (4)
- 絶縁層の両側に金属箔を積層一体化した金属箔張り積層板に対し、コンフォーマル工法又はダイレクトレーザ工法を用いて、前記絶縁層両側の金属箔及び絶縁層を貫通するスルーホール用穴と、このスルーホール用穴の開口部に形成される絶縁層両側の金属箔の飛び出しと、この金属箔の飛び出しと前記スルーホール用穴の内壁との間に形成される下方空間と、を設ける工程(1)と、
前記スルーホール用穴内及び絶縁層両側の金属箔上に、電解フィルドめっき層を形成することによって前記スルーホール用穴を穴埋めし、前記絶縁層両側の金属箔同士を電気的に接続するスルーホールを形成する工程(2)と、
前記電解フィルドめっき層を形成後の絶縁層両側の金属箔を回路加工して配線を形成する工程(3)と、を有する多層配線基板の製造方法であって、
前記工程(2)において、
前記電解フィルドめっき層の形成に用いられる電解フィルドめっき液にめっき促進剤及びめっき抑制剤が含まれ、
前記電解フィルドめっき層の形成によるスルーホール用穴の穴埋めが、電解フィルドめっきの電流密度を電解フィルドめっきの途中で一旦低下させ、再び増加させて行われ、
電解フィルドめっきの電流密度を一旦低下させるタイミングが、スルーホールの断面形状が、スルーホール用穴の開口部に形成された絶縁層両側の金属箔の飛び出しと前記スルーホール用穴の内壁との間の下方空間を電解フィルドめっき層が充填した時点以降であり、
前記電解フィルドめっき層が前記下方空間を充填した状態において、前記金属箔の飛び出しの裏面近傍で前記スルーホール用穴の内壁よりも窪む直下部に対応する前記スルーホール用穴の開口部に前記めっき抑制剤を吸着させる一方、前記スルーホール用穴の内部に前記めっき促進剤を吸着させる、多層配線基板の製造方法。 - 前記工程(2)における、電解フィルドめっきの電流密度を一旦低下させるタイミングが、スルーホール用穴の開口部に形成された絶縁層両側の金属箔の飛び出しと前記スルーホール用穴の内壁との間の下方空間を電解フィルドめっき層が充填し、かつ、めっきボイドが形成される前である請求項1に記載の多層配線基板の製造方法。
- 前記工程(2)における、電解フィルドめっきの電流密度を電解フィルドめっきの途中で一旦低下させる際の電流密度の低下率が、低下させる直前の50%以上である請求項1又は2に記載の多層配線基板の製造方法。
- 前記工程(2)における、電解フィルドめっきの電流密度を電解フィルドめっきの途中で一旦低下させた後、再び増加させる際の電流密度が、前記一旦低下させる直前の電流密度以上である請求項1から3の何れか一項に記載の多層配線基板の製造方法。
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