JP6313669B2 - 導電材料及び接続構造体 - Google Patents
導電材料及び接続構造体 Download PDFInfo
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- JP6313669B2 JP6313669B2 JP2014122505A JP2014122505A JP6313669B2 JP 6313669 B2 JP6313669 B2 JP 6313669B2 JP 2014122505 A JP2014122505 A JP 2014122505A JP 2014122505 A JP2014122505 A JP 2014122505A JP 6313669 B2 JP6313669 B2 JP 6313669B2
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- conductive
- particles
- layer
- conductive material
- connection
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
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- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 3
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- JRSJRHKJPOJTMS-UHFFFAOYSA-N trimethoxy(2-phenylethenyl)silane Chemical compound CO[Si](OC)(OC)C=CC1=CC=CC=C1 JRSJRHKJPOJTMS-UHFFFAOYSA-N 0.000 description 1
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- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Description
上記導電材料は熱硬化性化合物を含む。また、上記導電材料は、熱硬化性化合物として、下記式(1)で表される構造単位を3個以上有する熱硬化性化合物Xを含む。上記熱硬化性化合物Xは1種のみが用いられてもよく、2種以上が併用されてもよい。
上記導電材料は熱硬化剤を含む。上記熱硬化剤は、1種のみが用いられてもよく、2種以上が併用されてもよい。
上記導電材料は、フラックスを含むことが好ましい。該フラックスの使用により、はんだの表面に酸化膜が形成され難くなり、さらに、はんだの表面又は電極の表面に形成された酸化膜を効果的に除去できる。この結果、接続構造体における導通信頼性がより一層高くなる。なお、上記導電材料は、フラックスを必ずしも含んでいなくてもよい。
上記導電性粒子は、少なくとも導電性の外表面がはんだであれば特に限定されない。上記導電性粒子は、基材粒子と該基材粒子の表面上に配置された導電層とを有し、該導電層の少なくとも外表面がはんだ層である導電性粒子であることが好ましい。上記基材粒子としては、樹脂粒子、金属粒子を除く無機粒子、有機無機ハイブリッド粒子及び金属粒子等が挙げられる。上記基材粒子は、コアシェル粒子であってもよい。上記基材粒子は、金属粒子ではない基材粒子であることが好ましく、樹脂粒子、金属粒子を除く無機粒子又は有機無機ハイブリッド粒子であることがより好ましい。上記基材粒子は、樹脂により形成された樹脂粒子であることが好ましい。電極間を接続する際には、導電性粒子を電極間に配置した後、一般的に導電性粒子を圧縮させる。基材粒子が樹脂粒子であると、圧縮により導電性粒子が変形しやすく、導電性粒子と電極との接触面積が大きくなる。このため、電極間の導通信頼性を高めることができる。接続構造体における耐熱衝撃特性をより一層高める観点からは、上記導電性粒子は、基材粒子と該基材粒子の表面上に配置された導電層とを有し、該導電層の少なくとも外表面がはんだ層である導電性粒子であることが好ましい。
本発明に係る導電材料は、フレキシブルプリント基板とガラスエポキシ基板との接続(FOB(Film on Board))、又はフレキシブルプリント基板とフレキシブルプリント基板との接続(FOF(Film on Film))に好適に用いられる。
本発明に係る導電材料は、フリップチップ用途に好適に用いられる。
本発明に係る導電材料は、半導体チップとフレキシブルプリント基板との接続(COF(Chip on Film))に好適に用いられる。
上記導電材料は、フィラーを含むことが好ましい。フィラーの使用により、導電材料の硬化物の熱線膨張率を抑制できる。上記フィラーの具体例としては、シリカ、窒化アルミニウム、アルミナ、ガラス、窒化ボロン、窒化ケイ素、シリコーン、カーボン、グラファイト、グラフェン及びタルク等が挙げられる。フィラーは1種のみが用いられてもよく、2種以上が併用されてもよい。熱伝導率が高いフィラーを用いると、本硬化時間が短くなる。
本発明に係る導電材料は、ペースト状又はフィルム状の導電材料であり、ペースト状の導電材料であることが好ましい。ペースト状の導電材料は、導電ペーストである。フィルム状の導電材料は、導電フィルムである。導電材料が導電フィルムである場合、導電性粒子を含む導電フィルムに、導電性粒子を含まないフィルムが積層されてもよい。本発明に係る導電材料は、異方性導電材料であることが好ましい。本発明に係る導電材料は、電極間の接続に用いられることが好ましく、回路接続材料であることが好ましく、電極間の電気的な接続に用いられる回路接続材料であることが更に好ましい。
テトラキス(グリシジルオキシフェニル)エタン(式(1)で表される構造単位を4個有する熱硬化性化合物、旭有機材工業社製「TEP−G」)
メチリジントリス(4,1−フェニレン)トリス(グリシジルエーテル)(式(1)で表される構造単位を3個有する熱硬化性化合物、JER社製「1032S50」)
ビスフェノールF型エポキシ樹脂(式(1)で表される構造単位を2個有する硬化性化合物、DIC社製「EXA−830CRP」)
フェノキシ樹脂1(巴工業社製「PKHB」、重量平均分子量25000)
フェノキシ樹脂2(巴工業社製「PKHC」、重量平均分子量30000)
エポキシ化合物1(ナガセケムテックス社製「EX−201P」)
エポキシ化合物2(DIC社製「HP−4032D」)
熱硬化剤1(旭化成社製「HX−3722」)
熱硬化剤2(旭化成社製「HX−3922」)
グルタル酸
アジピン酸
導電性粒子A:ジビニルベンゼン樹脂粒子の表面にニッケルめっき層が形成されており、かつ該ニッケルめっき層の外表面にはんだ層が形成されている導電性粒子A(平均粒子径15μm)
導電性粒子B:ジビニルベンゼン樹脂粒子の表面上に銅層が形成されており、該銅層の外表面にはんだ層が形成されている導電性粒子B
平均粒子径10μmのジビニルベンゼン樹脂粒子(積水化学工業社製「ミクロパールSP−210」)を無電解ニッケルめっきし、樹脂粒子の表面上に厚さ0.1μmの下地ニッケルめっき層を形成した。次いで、下地ニッケルめっき層が形成された樹脂粒子を電解銅めっきし、厚さ1μmの銅層を形成した。更に、錫及びビスマスを含有する電解めっき液を用いて、電解めっきし、厚さ1μmのはんだ層を形成した。このようにして、樹脂粒子の表面上に厚み1μmの銅層が形成されており、該銅層の外表面に厚み1μmのはんだ層(錫:ビスマス=43重量%:57重量%)が形成されている導電性粒子Bを作製した。
接着付与剤(信越化学工業社製「KBE−403」)
下記の表1に示す成分を下記の表1に示す配合量で配合して、異方性導電ペーストを得た。
L/Sが100μm/100μmの銅電極パターン(銅電極厚み10μm)を上面に有するガラスエポキシ基板(FR−4基板)を用意した。また、L/Sが100μm/100μmの銅電極パターン(銅電極厚み10μm)を下面に有するフレキシブルプリント基板を用意した。
(1)硬化率
得られた異方性導電ペーストを用いて、DSCを用いて発熱ピークの面積から硬化率を算出した。
得られた接続構造体の上下の電極間の接続抵抗をそれぞれ、4端子法により測定した。2つの接続抵抗の平均値を算出した。なお、電圧=電流×抵抗の関係から、一定の電流を流した時の電圧を測定することにより接続抵抗を求めることができる。上下の電極間の導通試験を下記の基準で判定した。
◎:接続抵抗の平均値が8.0Ω以下
○:接続抵抗の平均値が8.0Ωを超え、10.0Ω以下
△:接続抵抗の平均値が10.0Ωを超え、15.0Ω以下
×接続抵抗の平均値が15.0Ωを超える
得られた接続構造体において、90度ピール強度を測定し、得られた値を接着力(N/cm)とした。
1a…表面
2…樹脂粒子
2a…表面
3…導電層
4…第1の導電層
4a…外表面
5…はんだ層
5a…溶融したはんだ層部分
11…導電性粒子
12…はんだ層
16…はんだ粒子
21…接続構造体
22…第1の接続対象部材
22a…表面
22b…第1の電極
23…第2の接続対象部材
23a…表面
23b…第2の電極
24…接続部
Claims (4)
- フラックスをさらに含む、請求項1に記載の導電材料。
- 電極間の電気的な接続に用いられる回路接続材料である、請求項1又は2に記載の導電材料。
- 第1の電極を表面に有する第1の接続対象部材と、
第2の電極を表面に有する第2の接続対象部材と、
前記第1の接続対象部材と前記第2の接続対象部材とを接続している接続部とを備え、
前記接続部が、請求項1〜3のいずれか1項に記載の導電材料により形成されており、
前記第1の電極と前記第2の電極とが前記導電性粒子により電気的に接続されている、接続構造体。
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