JP2017216299A - 回路部材の接続構造および接続方法 - Google Patents
回路部材の接続構造および接続方法 Download PDFInfo
- Publication number
- JP2017216299A JP2017216299A JP2016107854A JP2016107854A JP2017216299A JP 2017216299 A JP2017216299 A JP 2017216299A JP 2016107854 A JP2016107854 A JP 2016107854A JP 2016107854 A JP2016107854 A JP 2016107854A JP 2017216299 A JP2017216299 A JP 2017216299A
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- Prior art keywords
- electrode
- circuit member
- bismuth
- solder material
- mass
- 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.)
- Granted
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- MPZNMEBSWMRGFG-UHFFFAOYSA-N bismuth indium Chemical compound [In].[Bi] MPZNMEBSWMRGFG-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 31
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 31
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Images
Classifications
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- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0016—Brazing of electronic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- H05K1/181—Printed circuits structurally associated with non-printed electric components associated with surface mounted components
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- H05K3/00—Apparatus or processes for manufacturing printed circuits
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- H10F39/00—Integrated devices, or assemblies of multiple devices, comprising at least one element covered by group H10F30/00, e.g. radiation detectors comprising photodiode arrays
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Abstract
【解決手段】第1電極を有する第1回路部材と、第2電極を有する第2回路部材とを接続する、回路部材の接続方法に関する。第2電極がバンプを有し、第1電極の表面にはんだ材料を有し、またはバンプの少なくとも先端部が、はんだ材料を含む。この接続方法は、(i)はんだ材料を介して、第1電極と第2電極とが対向するように、第1回路部材と第2回路部材とを配置する工程と、(ii)第2回路部材を第1回路部材に対して押圧しながら加熱して、はんだ材料を溶融させた後、溶融したはんだ材料を固化することにより、第1電極と第2電極とを電気的に接続するはんだ部を形成する工程と、を含む。はんだ材料は、ビスマス含有量が20質量%超かつ80質量%以下であるビスマス−インジウム合金を含む。
【選択図】図1
Description
まず、第1電極を備えた第1主面を有する第1回路部材と、バンプを有する第2電極を備えた第2主面を有する第2回路部材とを接続する、回路部材の接続方法について説明する。はんだ材料は、第1電極の表面に付与もしくは塗布されているか、またはバンプの少なくとも先端部に含まれる。
回路部材の接続方法は、(i)はんだ材料を介して、第1電極と第2電極とが対向するように、第1回路部材と第2回路部材とを配置する工程と、(ii)第2回路部材を第1回路部材に対して押圧しながら加熱して、はんだ材料を溶融させた後、溶融したはんだ材料を固化することにより、第1電極と第2電極とを電気的に接続するはんだ部を形成する工程とを含む。
一方、はんだ材料に含まれるインジウムは、展性に優れるため、はんだ材料と第1電極および第2電極との濡れ面積を大きくすることができる。
第1回路部材は、例えば、所定のピッチで配列している複数の第1電極を備えた第1主面を有する。第1回路部材は、特に限定されないが、例えば、テレビ、タブレット、スマートフォン、ウェアラブルデバイスなどが具備する表示パネルに用いられる透明基板であり得る。透明基板は、半透明であってもよい。透明基板としては、ガラス基板およびフィルム状基板が挙げられる。フィルム状基板は、透明性を有する樹脂フィルムで形成されている。透明性を有する樹脂フィルムとしては、ポリエチレンテレフタレート(PET)、ポリカーボネート(PC)、ポリエチレンナフタレート(PEN)などのフィルムであり得る。第1主面は、第1回路部材の任意の主面であり得る。
第2回路部材は、例えば、所定のピッチで配列している複数の第2電極を備えた第2主面を有する。第2回路部材は、特に限定されないが、例えば半導体チップ、電子部品パッケージ、フィルム基板、コネクタなどであり得る。第2主面は、第2回路部材の任意の主面であり得る。
第2電極の表面に存在するバンプは、第1電極と第2電極とを短い距離で確実に接続するために設けられる。バンプを用いた電極間の電気的接続は、ワイヤ・ボンディングに比べて実装面積を小さくすることができ、電子部品の小型化に有利である。また、電極間の接続距離を短くすることができるため、優れた電気的特性が要求される電子部品の接続に有利である。
バンプのうち、はんだ材料で構成される部分が占める体積割合は30体積%以上であることが好ましい。これにより、ビスマスの異常液体によるはんだ材料の膨張効果が十分に得られる。
更に、上記の接続方法は、(iii)第1主面と第2主面との間に接着剤を介在させる工程と、(iv)接着剤から第1主面と第2主面とを接着する樹脂部を形成する工程とを含むことが好ましい。これにより、回路部材の接続強度が向上する。
接着剤は、エポキシ樹脂などの熱硬化性樹脂を含む樹脂組成物であればよい。樹脂組成物は、更に熱硬化性樹脂の硬化剤を含んでもよい。硬化剤としては、アミン、フェノール樹脂、酸無水物などが挙げられる。樹脂組成物は、更に、種々の添加剤を含んでもよい。添加剤としては、はんだ材料や電極表面の酸化被膜を除去する活性剤、フィラー、硬化促進剤などが挙げられる。
本発明に係る回路部材の接続構造は、上記接続方法により得られる。この接続構造は、第1電極を備えた第1主面を有する第1回路部材と、第2電極を備えた第2主面を有する第2回路部材と、第1主面と第2主面との間に介在する接合部と、を備える。接合部は、上記接続方法で形成されるはんだ部を有する。接合部は、更に、上記接続方法で形成される樹脂部を有してもよい。
厚さ0.3mmで矩形(30mm×30mmサイズ)のガラス基板の一方の表面(第1主面)に、透明電極として、幅50μmの複数のITO電極(厚さ1500Å)をストライプ状に形成した。ITO電極のピッチは0.1mmとした。
なお、ITO電極の形成には、蒸着法を用いた。ITO電極の表面状態に関しては、算術平均粗さRaは7.8nmであり、最大高さRzは66.6nmであった。算術平均粗さRaおよび最大高Rzは、JIS B 0601−2001に準拠する測定方法により求めた。
電極間の接続状態を評価するために、第2電極を備えた第2主面を有する第2回路部材の代わりに、便宜上、厚み1.6mmである矩形(3.2mm×1.6mmサイズ)の、表面がAuめっきされたCu製板状部材(Auめっき層の厚み0.1〜0.5μm)を用いた。
電解めっき法により、バンプの代わりとして、板状部材の一方の表面(3.2mm×1.6mmサイズ)に、はんだ材料を含む被覆層(厚み3〜10μm)を形成した。
はんだ材料を含む被覆層を有する板状部材を、透明電極を有するガラス基板の上に搭載した。このようにして、はんだ材料を介して、透明電極とAuめっき層とが対向するように、ガラス基板と板状部材とを配置した(工程(i))。
各種はんだ材料を用いてそれぞれ評価用接続構造体を得た。
ボンディングテスタ((株)レスカ製、PTR−1102)を用いて、評価用接続構造体の透明電極とAuめっき層との接続強度を測定した。具体的には、評価用接続構造体を固定した後、荷重センサが取り付けられたツールで評価用板状部材の側面(1.6mm×1.6mmサイズ)を押し、透明電極とAuめっき層との接続が破壊された際の荷重を測定した。測定時には、ツールをガラス基板面から0.3mmの高さまで下降させた。ツールの送り速度は0.5mm/秒とした。
2 第1回路部材
3 はんだ材料
4 第2電極
5 第2回路部材
6 はんだ部
Claims (12)
- 第1電極を備えた第1主面を有する第1回路部材と、
第2電極を備えた第2主面を有する第2回路部材と、
前記第1主面と前記第2主面との間に介在する接合部と、を備え、
前記接合部は、前記第1電極と前記第2電極とを電気的に接続するはんだ部を有し、
前記はんだ部は、少なくとも前記第1電極の近傍にビスマス−インジウム合金を含み、
前記ビスマス−インジウム合金に含まれるビスマスの量が、20質量%超かつ80質量%以下である、回路部材の接続構造。 - 前記接合部は、さらに、前記第1主面と前記第2主面とを接着する樹脂部を有する、請求項1に記載の回路部材の接続構造。
- 前記第1電極は、透明電極である、請求項1または2に記載の回路部材の接続構造。
- 前記ビスマス−インジウム合金に含まれるビスマスの量が、27質量%〜68質量%である請求項1〜3のいずれか1項に記載の回路部材の接続構造。
- 前記ビスマス−インジウム合金の融点は、72℃〜109℃である、請求項4に記載の回路部材の接続構造。
- 第1電極を備えた第1主面を有する第1回路部材と、第2電極を備えた第2主面を有する第2回路部材とを接続する、回路部材の接続方法であって、
前記第2電極がバンプを有し、
前記第1電極の表面にビスマス−インジウム合金を含むはんだ材料を有し、または前記バンプの少なくとも先端部が、ビスマス−インジウム合金を含むはんだ材料を含み、
(i)前記はんだ材料を介して、前記第1電極と前記第2電極とが対向するように、前記第1回路部材と前記第2回路部材とを配置する工程と、
(ii)前記第2回路部材を前記第1回路部材に対して押圧しながら加熱して、前記はんだ材料を溶融させた後、前記溶融したはんだ材料を固化することにより、前記第1電極と前記第2電極とを電気的に接続するはんだ部を形成する工程と、
を含み、
前記ビスマス−インジウム合金に含まれるビスマスの量が、20質量%超かつ80質量%以下である、回路部材の接続方法。 - さらに、(iii)前記第1主面と前記第2主面との間に接着剤を介在させる工程と、(iv)前記接着剤から前記第1主面と前記第2主面とを接着する樹脂部を形成する工程とを含む、請求項6に記載の回路部材の接続方法。
- 前記工程(iii)は、前記工程(i)において実施するか、または、前記工程(ii)の後に実施する、請求項7に記載の回路部材の接続方法。
- 前記第1電極は、透明電極である、請求項6〜8のいずれか1項に記載の回路部材の接続方法。
- 前記ビスマス−インジウム合金に含まれるビスマスの量が、27質量%〜68質量%である請求項6〜9のいずれか1項に記載の回路部材の接続方法。
- 前記ビスマス−インジウム合金の融点は、72℃〜109℃である、請求項10に記載の回路部材の接続方法。
- 前記工程(i)において、前記第1電極と前記はんだ材料との間にフラックスを介在させない、請求項6〜11のいずれか1項に記載の回路部材の接続方法。
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