JP5430540B2 - ボンディングワイヤ及びその製造方法 - Google Patents
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Description
(1)金属製ワイヤ表面に有機被膜を形成したボンディングワイヤであって、AES分析による有機被膜の厚みがSiO2換算で0.5〜3nmであり、
ワイヤ表面をTOF−SIMS分析し、金属製ワイヤの主成分金属による2次イオンスペクトルのピーク強度を1として規格化したとき、
炭素を1〜6有するアミンの1種以上をC系成分とし、C系成分に起因する2次イオンスペクトルの少なくとも1つのピーク強度が1以上であり、
炭素を15〜21有する陽イオン系界面活性剤の1種以上をA系成分とし、炭素を15〜20有する非イオン系界面活性剤の1種以上をB系成分とし、A系成分に起因する2次イオンスペクトルの少なくとも1つのピーク強度が1以上であるか、及び/又は、B系成分に起因する2次イオンスペクトルの少なくとも1つのピーク強度が0.1以上であり、
前記金属製ワイヤの材質が、Au、Au合金、Au−Ag合金、Ag、Cuのいずれかであることを特徴とするボンディングワイヤ。
(2)Au、Au合金、Au−Ag合金、Ag、Cuのいずれかである金属製ワイヤ表面に有機被膜を形成し、AES分析による有機被膜の厚みがSiO2換算で0.5〜3nmであるボンディングワイヤの製造方法であって、
C系成分として炭素を1〜6有するアミンの1種以上を合計で0.001〜0.1質量%含有し、A系成分として炭素を15〜21有する陽イオン系界面活性剤の1種以上を合計で0.005〜0.1質量%、及び/又は、B系成分として炭素を15〜20有する非イオン系界面活性剤の1種以上を合計で0.005〜0.05質量%含有する塗布液に、金属製ワイヤを0.01〜1秒浸漬して有機被膜を塗布することを特徴とするボンディングワイヤの製造方法。
ボンディングワイヤを巻き胴直径50mmのスプールに巻き取り、スプールを9rpmの回転速度で15分間回転させつつ30cmの高さからワイヤを垂らしてワイヤを巻きほどしたとき、ワイヤが繰り出される位置によって解きほぐれ性を評価した。スプール8からボンディングワイヤ1が繰り出される位置9が、図1(a)のようにAの領域であれば良好(○)、B〜Dの領域であれば不良(×)と評価した。図1(b)はBの領域から繰り出されている。各評価水準についてN数5の評価を行った。
基板上の第1電極にボンディングワイヤをボール接合して第1接合部を形成し、第2電極にボンディングワイヤをウェッジ接合して第2接合部を形成した。装置はUTC−1000(新川製)を用い、基板にマウントされたチップ上にボンディングした。接合性評価装置はseries5000(Dage製)を用い、接合強度を測定した。各評価水準についてN数30の平均値で評価を行った。従来使用されていた塗布剤と接合性が同等な場合を(○)、悪化する場合を(×)とした。
第1電極の上にボール接合によって第1接合部を形成した後、キャピラリを図2に示す軌跡で動かすことによってワイヤに台形状の屈曲を形成し、第2電極にウェッジ接合によって第2接合部を形成した。図2の(a)、(b)、(c)の順でボンディングが進行する。キャピラリ7はキャピラリの軌跡10に沿って運動する。まず半導体基板2上の第1電極3に第1接合部4が形成され、その後、図2(a)、(b)、(c)の順でキャピラリ7が移動することにより、図2(c)に示すようなボンディングワイヤ1の台形形状が形成され、最後に第2電極5の上に第2接合部6が形成される。このとき、図2(b)に示す軌跡10の過程でできる台形状の屈曲部が、主にワイヤ削れ発生位置11となる。屈曲部の下の部分をSEMにて観察し、ワイヤの削れ状態を評価した。各評価水準についてN数200の評価を行った。削れひげが全く発生しない場合を(○)、10μm以下のひげが一つでもある場合を(△)、10μm以上のひげが一つでもある場合を(×)とした。
UTC−1000を用いて、スパン1mmのワイヤを20万連続ボンディングして評価した。初期状態のワイヤと、ケミカルフィルターが設置されていないクリーンルームにて1週間暴露したワイヤとを用いて、20万ボンド使用後のキャピラリ先端部の汚れの状態をSEMにて評価した。各評価水準についてN数3の評価を行った。従来使用されていた塗布剤より汚れが少ない場合を(○)、同等な場合を(△)、多い場合を(×)とした。
2 半導体基板
3 第1電極
4 第1接合部
5 第2電極
6 第2接合部
7 キャピラリ
8 スプール
9 ワイヤが繰り出される位置
10 キャピラリの軌跡
11 ワイヤ削れ発生位置
Claims (2)
- 金属製ワイヤ表面に有機被膜を形成したボンディングワイヤであって、AES分析による有機被膜の厚みがSiO2換算で0.5〜3nmであり、
ワイヤ表面をTOF−SIMS分析し、金属製ワイヤの主成分金属による2次イオンスペクトルのピーク強度を1として規格化したとき、
炭素を1〜6有するアミンの1種以上をC系成分とし、C系成分に起因する2次イオンスペクトルの少なくとも1つのピーク強度が1以上であり、
炭素を15〜21有する陽イオン系界面活性剤の1種以上をA系成分とし、炭素を15〜20有する非イオン系界面活性剤の1種以上をB系成分とし、A系成分に起因する2次イオンスペクトルの少なくとも1つのピーク強度が1以上であるか、及び/又は、B系成分に起因する2次イオンスペクトルの少なくとも1つのピーク強度が0.1以上であり、
前記金属製ワイヤの材質が、Au、Au合金、Au−Ag合金、Ag、Cuのいずれかであることを特徴とするボンディングワイヤ。 - Au、Au合金、Au−Ag合金、Ag、Cuのいずれかである金属製ワイヤ表面に有機被膜を形成し、AES分析による有機被膜の厚みがSiO2換算で0.5〜3nmであるボンディングワイヤの製造方法であって、
C系成分として炭素を1〜6有するアミンの1種以上を合計で0.001〜0.1質量%含有し、A系成分として炭素を15〜21有する陽イオン系界面活性剤の1種以上を合計で0.005〜0.1質量%、及び/又は、B系成分として炭素を15〜20有する非イオン系界面活性剤の1種以上を合計で0.005〜0.05質量%含有する塗布液に、金属製ワイヤを0.01〜1秒浸漬して有機被膜を塗布することを特徴とするボンディングワイヤの製造方法。
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