JP2708574B2 - 半導体用ボンディング細線の製造方法 - Google Patents
半導体用ボンディング細線の製造方法Info
- Publication number
- JP2708574B2 JP2708574B2 JP1273520A JP27352089A JP2708574B2 JP 2708574 B2 JP2708574 B2 JP 2708574B2 JP 1273520 A JP1273520 A JP 1273520A JP 27352089 A JP27352089 A JP 27352089A JP 2708574 B2 JP2708574 B2 JP 2708574B2
- Authority
- JP
- Japan
- Prior art keywords
- wire
- alloy
- semiconductor
- purity
- present
- 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.)
- Expired - Fee Related
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/74—Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies
- H01L24/741—Apparatus for manufacturing means for bonding, e.g. connectors
- H01L24/745—Apparatus for manufacturing wire connectors
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/43—Manufacturing methods
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/43—Manufacturing methods
- H01L2224/438—Post-treatment of the connector
- H01L2224/43848—Thermal treatments, e.g. annealing, controlled cooling
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
- H01L2224/45001—Core members of the connector
- H01L2224/4501—Shape
- H01L2224/45012—Cross-sectional shape
- H01L2224/45015—Cross-sectional shape being circular
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
- H01L2224/45001—Core members of the connector
- H01L2224/45099—Material
- H01L2224/451—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof
- H01L2224/45117—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 400°C and less than 950°C
- H01L2224/45124—Aluminium (Al) as principal constituent
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
- H01L2224/45001—Core members of the connector
- H01L2224/45099—Material
- H01L2224/451—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof
- H01L2224/45138—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
- H01L2224/45144—Gold (Au) as principal constituent
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
- H01L2224/45001—Core members of the connector
- H01L2224/45099—Material
- H01L2224/451—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof
- H01L2224/45138—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
- H01L2224/45147—Copper (Cu) as principal constituent
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- H—ELECTRICITY
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
- H01L2224/4554—Coating
- H01L2224/45565—Single coating layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
- H01L2224/4554—Coating
- H01L2224/45599—Material
- H01L2224/456—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/74—Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies and for methods related thereto
- H01L2224/741—Apparatus for manufacturing means for bonding, e.g. connectors
- H01L2224/745—Apparatus for manufacturing wire connectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01013—Aluminum [Al]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01029—Copper [Cu]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01078—Platinum [Pt]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01079—Gold [Au]
Description
ング細線の製造法に関するものである。
Cuが使用されているが、最近半導体の多ピン化に伴いボ
ンディング線も次第に細線(20μm以下)化されるよう
になり、それなりの強度,伸び等の機械的特性や接合
性,ボール成形性等のボンディング特性が要求される。
これらの要求は例えば特公昭57−35577号公報にみられ
るように、通常特殊な合金元素を添加することでこれを
満足するように製造される。
加熱等の方法により溶解し、合金化元素あるいは合金化
元素を高濃度に含有する母合金を添加することにより行
なう。
は雰囲気からの不純物介在物の混入があり、ワイヤーの
特性を劣化させるおそれがあること、又Al2O3,SiO2等の
介在物が混入することにより伸線中に断線することがあ
り、歩留りを低下させる。又、凝固中に偏析が生じるた
め、ワイヤーの各部の濃度が多少変化するため、特性、
特に強度,伸びが長手方向でバラツキを生じている。そ
れらの改善のため、インゴットを再加熱(又は溶解)し
均一化する処理を行なっている(ゾーンレベリング)
が、それでも十分とはいえない。
あり、高純度素材の純度を劣化させずに合金を添加する
ものであって、すなわち介在物の混入は全くなく、合金
元素の偏析がみられない細線への合金添加法を提供する
ものである。
ある。
後、誘導体に拡散熱処理を施すことにより合金化を行な
い、その後、伸線することを特徴とする半導体用ボンデ
ィング細線の製造方法。
に、スパッタリングによりクリーニングすることを特徴
とする前記記載の半導体用ボンディング細線の製造方
法。
り該金属のインゴットを圧延し、伸線して0.1〜5mmの径
の線(中間素材)にする。
槽内を連続的に通過させ線の表面に合金元素あるいは合
金元素を高濃度に含有する母合金を被覆する。
グ、真空蒸着に代表される物理蒸着方法、プラズマCVD
に代表される化学蒸着方法を用い、メッキは通常行なわ
れている浸漬,電解方法を採用する。被覆厚は得ようと
する合金濃度をC(重量パーセント)とし、高純度線の
径をd(mm)、蒸着あるいはメッキする合金化元素の被
覆厚みをΔd(mm)、又、合金化元素の密度をρc、高
純度線の密度をρMとすると、 の関係となる合金化の濃度は高濃度になりすぎるとボー
ル硬化の要因となり、好ましくないので、0.1%以下に
するのが通常であり、すなわちd≫Δdであるから として目的とする濃度Cが保たれるよう厚みΔdを決定
すればよい。
るのでΔdは2.5×d×ρM×ρc×10-7〜2.5×d×ρ
M/ρc×10-4の範囲となる。
合金化元素の含有する割合に応じて被覆厚みを変化させ
る必要がある。その濃度がα(%)とすると となる。
行なう。拡散熱処理により、被覆合金を線の中心部まで
均一に拡散させる。均一拡散するための条件は Dは拡散係数であり、D0とQが与えられれば、各温度
に対して求められる。D0とQは各元素特有の定数で、例
えば、日本金属学会編金属データブックあるいはCRC Pr
ess発行のCRC Handbook of chemistry and physics等に
掲載されている。なおRは気体係数である。ここでKは
ほぼ1〜10の間の値の定数である。
する細線の線径の3〜200倍の太いところで行ない、そ
の後伸線をして所望の径の細線とすることが好ましい。
最も好ましくは細線の5〜100倍である。すなわち本発
明においては、例えば径30μmφの細線を得ようとする
場合には、径0.15〜3mmφの中間材に合金を被覆し、拡
散処理を施してから伸線することが最も好ましい。この
ようにすることによって、生産性が極めて大となり、細
線化した後に蒸着−拡散処理をした場合に起こる粒の粗
大化を防ぐことができる。また通常は、伸線の中間工程
で中間焼鈍を行なってひずみとりをするのであるが、中
間焼鈍をすべき線径で、蒸着,拡散−熱処理を行なうこ
とにより、中間焼鈍を省略することができる。
の一例を示すもので、真空容器1中に、線2を回巻し、
これを繰り出すリール3と線2を巻取る巻取りリール4
を設置する。これらのリールは線2を回転しながら移送
する機能を備えている。線2の移行領域には、繰り出し
側に電極5,6を配したクリーニングゾーンと、巻取り側
にターゲット7及び8を設けたスパッタリングゾーンを
設けている。9はArガス供給管であり、10は排気管であ
る。
置を用いて連続的に回転させながら移行させ、移行線2
に連続的にグロー放電スパッタリングを行なって表面を
清浄にした後、大気中に出すことなくスパッタリング蒸
着をした。
への蒸着厚みが約1100Åになるように調整した。
ー放電は何れも300〜1000Vの直流電源により行なった。
線の断面を研磨し、X線分析、イオンマイクロアナライ
ザーにより分析した結果、銅、ベリリウム共ほぼ均一に
拡散していることが確かめられた、化学分析した結果、
銅は210ppm、ベリリウムは4ppm含有していることがわか
った。このことは上記した式の関係が成り立っているこ
とを示している。この金合金線を20μmまで伸線した
後、仕上げ熱処理を行ない、この細線を用いて半導体チ
ップとリードとのボンディングを実施した。ボール形成
性、強度延性バランスは安定してバラツキがなく伸線時
の断線もなかった。
細線を溶解法で作成し、それぞれの製造時における断線
回数と長手方向での伸びのバラツキのデーターを示す。
て安定した機械的性質を有し、しかも接合にもトラブル
がない優れたボンディング線であることがわかる。
少なく)合金細線に所望の特性が安定して得られると共
に、このように細線を高能率で生産できるのであり、そ
の工業的価値は極めて大きい。
置の一例を示す説明図である。
Claims (2)
- 【請求項1】導体の表面に、合金元素あるいは高濃度合
金を蒸着、メッキにより被覆した後、拡散熱処理を施す
ことにより合金化を行ない、その後伸線することを特徴
とする半導体用ボンディング細線の製造方法。 - 【請求項2】導体表面を合金元素の蒸着前にスパッタリ
ングによりクリーニングすることを特徴とする請求項
記載の半導体用ボンディング細線の製造方法。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1273520A JP2708574B2 (ja) | 1989-10-20 | 1989-10-20 | 半導体用ボンディング細線の製造方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1273520A JP2708574B2 (ja) | 1989-10-20 | 1989-10-20 | 半導体用ボンディング細線の製造方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03135041A JPH03135041A (ja) | 1991-06-10 |
JP2708574B2 true JP2708574B2 (ja) | 1998-02-04 |
Family
ID=17529003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1273520A Expired - Fee Related JP2708574B2 (ja) | 1989-10-20 | 1989-10-20 | 半導体用ボンディング細線の製造方法 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2708574B2 (ja) |
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-
1989
- 1989-10-20 JP JP1273520A patent/JP2708574B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH03135041A (ja) | 1991-06-10 |
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