JPH0479237A - Bonding wire for semiconductor element - Google Patents

Bonding wire for semiconductor element

Info

Publication number
JPH0479237A
JPH0479237A JP2192793A JP19279390A JPH0479237A JP H0479237 A JPH0479237 A JP H0479237A JP 2192793 A JP2192793 A JP 2192793A JP 19279390 A JP19279390 A JP 19279390A JP H0479237 A JPH0479237 A JP H0479237A
Authority
JP
Japan
Prior art keywords
alloy
wire
neck part
strength
busbar
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.)
Pending
Application number
JP2192793A
Other languages
Japanese (ja)
Inventor
Katsuyuki Toyofuku
豊福 克之
Ichiro Nagamatsu
永松 一郎
Shinji Shirakawa
白川 信次
Sukehito Iga
祐人 伊賀
Takeshi Kujiraoka
鯨岡 毅
Norimasa Murakami
村上 憲正
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tanaka Denshi Kogyo KK
Original Assignee
Tanaka Denshi Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tanaka Denshi Kogyo KK filed Critical Tanaka Denshi Kogyo KK
Priority to JP2192793A priority Critical patent/JPH0479237A/en
Priority to US07/729,226 priority patent/US5364706A/en
Priority to MYPI91001293A priority patent/MY107874A/en
Priority to GB9115519A priority patent/GB2248416B/en
Publication of JPH0479237A publication Critical patent/JPH0479237A/en
Pending legal-status Critical Current

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    • H01L24/00Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/01Means 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
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    • H01L2224/45565Single coating layer
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Abstract

PURPOSE:To make strength of a neck part equivalent to that of a busbar or more and to improve the drawing strength of wire by coating an outer peripheral surface of a core which consists of a specified metal or an alloy thereof with a coating material which consists of a specified metal or an alloy thereof. CONSTITUTION:A coating material 1 which consists of high purity Pt or Pt alloy is clad on a core 2 which consists of high purity Pd or Pd alloy. Then, wire drawing processing is performed. After annealing treatment is performed in the middle of the processing, a busbar of a specified wire diameter is formed by wire drawing processing. Furthermore, stress is removed. In the constitution, a neck part is thermally affected during ball formation, and an outer peripheral part of the core and an inner peripheral part of a coating member of the neck part mutually diffuse; thereby, a diffusion layer consisting of Pd-Pt alloy is formed and strength of the neck part is improved compared with a busbar without a diffusion layer. Therefore, it is possible to make strength of the neck part equivalent to that of the busbar or more. It is thereby possible to obtain thinner bonding wire, to reduce bonding pitch accordingly and to realize high density package of an LSI.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明は半導体素子のチップ電極と外部リードとを接続
するために用いられる半導体素子用ボンディング線、特
にボールボンディング法に好適なものに関する。
DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a bonding wire for a semiconductor device used for connecting a chip electrode of a semiconductor device and an external lead, and particularly to a bonding wire suitable for the ball bonding method.

〈従来の技術〉 従来、この種の半導体素子用ボンディング線として例え
ばキャピラリーの先端から垂下したAU線の先端を電気
トーチにより溶融させてボールを形成し、このボールを
半導体素子のチップ電極に圧着して接着せしめ、その後
ループ状に外部リードまで導いて該外部リードに圧着・
切断することにより、チップ電極と外部リードを接続さ
せたものがある。
<Prior art> Conventionally, this type of bonding wire for semiconductor devices has been used, for example, by melting the tip of an AU wire hanging from the tip of a capillary with an electric torch to form a ball, and then press-bonding this ball to the chip electrode of a semiconductor device. Then, lead it in a loop shape to the external lead and crimp/bond it to the external lead.
Some devices have chip electrodes and external leads connected by cutting.

〈発明が解決しようとする課題〉 しかし乍ら、このような従来の半導体素子用ボンディン
グ線ではボール形成時にこのボール直上のネック部が熱
影響を受けて線材中に蓄積された応力が緩和されるため
、熱影響を受けない母線に比べ機械的強さが低下し、そ
の結果ボンディング作業中にネック部が破断したりワイ
ヤ倒れやワイヤ垂れが発生すると共に、製品の温度サイ
クル寿命試験において繰り返し温度変化により熱膨張・
収縮して発生する応力がネック部に集中し、ネック部の
破断が発生し易いという問題がある。
<Problems to be Solved by the Invention> However, in such conventional bonding wires for semiconductor devices, when the ball is formed, the neck directly above the ball is affected by heat, and the stress accumulated in the wire is alleviated. As a result, the mechanical strength is lower than that of a bus bar that is not affected by heat, resulting in neck breakage, wire collapse, and wire sag during bonding operations, as well as repeated temperature changes during product temperature cycle life tests. Thermal expansion due to
There is a problem in that the stress generated by contraction concentrates on the neck portion, making it easy for the neck portion to break.

一方、近年LSIの高密度実装化に伴って多ピン化傾向
が強まる中、ボンディング線を細線化してボンディング
ピッチを短縮することが要求されている。
On the other hand, in recent years, as LSIs have become more densely packaged and the number of pins has increased, there has been a demand for thinner bonding lines to shorten the bonding pitch.

しかし、前述のボンディング線ではネック部が破断し易
いためにその線径を細くすることができず、上記要求を
満足し得ないという問題もある。
However, the above-mentioned bonding wire has the problem that the neck portion is easily broken, so that the diameter of the wire cannot be made thinner, and the above-mentioned requirements cannot be satisfied.

本発明は斯る従来事情に鑑み、ネック部の強さを母線と
同等以上にすることを目的とする。
In view of such conventional circumstances, the present invention aims to make the strength of the neck portion equal to or higher than that of the generatrix.

〈課題を解決するための手段〉 上記課題を解決するために本発明が講する技術的手段は
、高純度?l又はPd合金からなる芯線の外周面に高純
度P1又はPt合金からなる被覆材を被覆したことを特
徴とするものである。
<Means for solving the problems> The technical means taken by the present invention to solve the above problems are high purity? The core wire is characterized in that the outer peripheral surface of the core wire made of P1 or Pd alloy is coated with a coating material made of high purity P1 or Pt alloy.

そして、高純度Pdとは不可避不純物を含む99.9%
以上のものを用い、Pd合金とは高純度PdにAg。
And, high purity Pd is 99.9% containing unavoidable impurities.
Using the above, the Pd alloy is high purity Pd and Ag.

Au(5at%以下) 、In、 Mg、 Mo、 Y
 (5a+%以下) 、Ge、 La (lat%以下
)や母材の融点より低い沸点を有する低沸点元素等の中
から選ばれる一種又は二種以上含有させたものを用い、
Pd合金とすることにより常温及び高温での機械的強さ
を向上させて高速ボンディングを可能にすると共に、ボ
ール形成時におけるネック部の結晶粒粗大化を防止して
いる。
Au (5at% or less), In, Mg, Mo, Y
(5a+% or less), Ge, La (lat% or less), and one or more elements selected from low boiling point elements having a boiling point lower than the melting point of the base material, etc.
By using a Pd alloy, the mechanical strength at room temperature and high temperature is improved, enabling high-speed bonding, and at the same time, coarsening of crystal grains in the neck portion during ball formation is prevented.

また、高純度Piとは不可避不純物を含む99.95%
以上のものを用い、P1合金とは高純度ptにAg(5
at%以下) 、Au (2a1%以下) 、BL C
al、 iIi。
In addition, high purity Pi is 99.95% containing unavoidable impurities.
Using the above, P1 alloy is high purity pt with Ag (5
at% or less), Au (2a1% or less), BLC
al, ii.

(5a+%以下) 、Ca、  In (lat%以下
)や母材の融点より低い沸点を有する低沸点元素等の中
から選ばれる一種又は二種以上含有させたものを用い、
P1合金とすることにより常温及び高温での機械的強さ
を向上させて高速ボンディングを可能にすると共に、ボ
ール形成時におけるネック部の結晶粒粗大化を防止して
いる。
(5a+% or less), Ca, In (lat% or less), and one or more elements selected from low boiling point elements having a boiling point lower than the melting point of the base material, etc.
By using P1 alloy, mechanical strength at room temperature and high temperature is improved, enabling high-speed bonding, and at the same time, coarsening of crystal grains in the neck portion during ball formation is prevented.

〈作用〉 本発明は上記技術的手段によれば、ボール形成時にネッ
ク部が熱影響を受けて該ネック部の芯線の外周部分と被
覆材の内周部分とが相互拡散することにより、Pd−P
t合金からなる拡散層を形成してネック部の強度が拡散
層のない母線に比べ向上するものである。
<Function> According to the above-mentioned technical means, the neck portion is affected by heat during ball formation, and the outer circumferential portion of the core wire of the neck portion and the inner circumferential portion of the coating material mutually diffuse, so that Pd- P
By forming a diffusion layer made of t-alloy, the strength of the neck portion is improved compared to a generatrix without a diffusion layer.

〈実施例〉 以下、具体的な実施例について説明する。<Example> Specific examples will be described below.

各試料は高純度Pt又はPt合金からなる被覆材1を高
純度I’d又はPd合金からなる芯線2にクラッドし、
次に線引き加工を施し、その途中で焼なまし処理を施し
た後に線引加工で線径30μの母線に成形し、更に応力
除去を行ったものであり、図示せる如く上記被覆材1の
外径をD工、芯線2の外径をD2としてこれら両者の径
比D 2 / D 1%を変えている。
In each sample, a coating material 1 made of high purity Pt or Pt alloy is clad on a core wire 2 made of high purity I'd or Pd alloy,
Next, wire drawing was performed, and after annealing during the drawing process, the wire was formed into a generatrix with a wire diameter of 30 μm, and stress was further removed. The diameter is D, and the outer diameter of the core wire 2 is D2, and the diameter ratio D 2 /D of these two is changed by 1%.

各試料の径比D2/D工%は次表に示す通りであって、
その試料弘1〜10は高純度PIの被覆材1を高純度[
’dの芯線2にクラッドした実施品、試料魚11〜12
は高純度ptにAuを2aj%含有させた被覆材1を高
純度Pdの芯線2にクラッドした実施品、試料阻13は
高純度1’lの被覆材1を高純度PdにAuを3at%
含有させた芯線2にクラッドした実施品、試料Nα14
は高純度Pt又はP1合金の被覆材1及び高純度I’d
又はPd合金の芯線2のどちらか一方か或いは両方にこ
れら母材の融点より低い沸点を有する低沸点元素を含有
させてクラッドした実施品、試料Nα15は従来の半導
体素子用ボンディング線の一例を示す比較品である。
The diameter ratio D2/D work% of each sample is as shown in the following table,
Samples 1 to 10 were coated with high-purity PI coating material 1.
Sample fish 11-12, cladding on core wire 2 of 'd
Sample 13 is an actual product in which a high-purity Pd coating material 1 containing 2aj% Au is clad on a high-purity Pd core wire 2, and a sample 13 is a high-purity 1'L coating material 1 containing high-purity Pd and 3at% Au.
Implemented product, sample Nα14, in which the core wire 2 containing the cladding was clad
is high purity Pt or P1 alloy coating material 1 and high purity I'd
Sample Nα15 is an example of a conventional bonding wire for semiconductor devices, in which one or both of the Pd alloy core wires 2 is clad with a low boiling point element having a boiling point lower than the melting point of the base material. This is a comparative product.

本実施例の場合には試料N1114として高純度P1の
被覆材1を高純度[’dにPを5QI]atppm含有
させた芯線2にクラッドしたものを例示し、これにより
、ボール形成時においてボール中の低沸点元素が蒸発飛
散して、金属特有のガス吸収を防いで接合に良好なボー
ルが得られると共に、ネック部中の低沸点元素は蒸発で
きないが気化しようとして応力を発生し、これに伴って
ボンディング後のネック部の破断強度が応力の発生しな
い母線に比べ向上させている。
In the case of this example, a sample N1114 is clad with a core wire 2 containing a high purity P1 at ppm of high purity [5QI P in 'd]. The low boiling point elements in the neck part evaporate and scatter, preventing the gas absorption peculiar to metals and providing a ball with good bonding properties.The low boiling point elements in the neck part cannot evaporate but try to vaporize and generate stress. Accordingly, the fracture strength of the neck portion after bonding is improved compared to a generatrix without stress.

また、試料Nα15として高純度Au (99,99%
)からなるAu線を例示している。
In addition, high purity Au (99,99%
) is illustrated.

上記試料によってプルテストを所定回数(n40)宛行
い、夫々のプル強度及びネック部以外の母線部分で破断
した回数と、チップ割れの有無を測定した結果を次表に
示す。
A pull test was performed on the above samples a predetermined number of times (n40), and the results of measuring each pull strength, the number of times the sample broke at the generatrix portion other than the neck portion, and the presence or absence of chip cracking are shown in the following table.

尚、各実施例の中でCモード破断の数及びチップ割れの
有無に基づき3ランクに区別し、チップ割れがなくしか
もCモード破断の数が多いものから少ないものへ順に◎
、O1×と判定した。
In addition, in each example, there are three ranks based on the number of C-mode fractures and the presence or absence of chip cracking, and ranks are ranked from those with no chip cracking and those with the highest number of C-mode fractures to the lowest.
, it was determined to be O1×.

この測定結果により本発明の各実施品はCモード破断の
数が比較界に比べて明らかに多いことからネック部がそ
れ以外の母線部分より強いことが判り、更に15≦D 
2 / D 1 ≦30及び95≦D2/D1≦99の
範囲の実施品がネック部の強度とボール形成時のボール
硬さに優れることが理解され、更に被覆材1の材質をP
I合金とするか又は芯線2の材質をPd合金とするか、
或いは低沸点元素を含有させることにより最適になるこ
とが理解される。
As a result of this measurement, each of the products according to the present invention has a clearly larger number of C-mode fractures than the comparative products, which indicates that the neck portion is stronger than the other generatrix portions, and furthermore, 15≦D
It is understood that the products in the range of 2/D1≦30 and 95≦D2/D1≦99 are superior in neck strength and ball hardness during ball formation.
I alloy or the material of the core wire 2 is Pd alloy,
Alternatively, it is understood that it becomes optimal by containing a low boiling point element.

〈発明の効果〉 本発明は上記の構成であるから、以下の利点を有する。<Effect of the invention> Since the present invention has the above configuration, it has the following advantages.

■ ボール形成時にネック部が熱影響を受けて該ネック
部の芯線の外周部分と被覆材の内周部分とが相互拡散す
ることにより、pd−pt金合金らなる拡散層を形成し
てネック部の強度が拡散層のない母線に比べ向上するの
で、ネック部の強さを母線と同等以上にすることができ
る。
■ When forming the ball, the neck part is affected by heat and the outer peripheral part of the core wire of the neck part and the inner peripheral part of the coating material mutually diffuse, forming a diffusion layer of PD-PT gold alloy, and the neck part The strength of the neck portion is improved compared to a bus bar without a diffusion layer, so the strength of the neck portion can be made equal to or higher than that of the bus bar.

従って、ボール形成時にネック部が熱影響を受けて母線
より弱くなる従来のものに比べ、ボンディング作業中の
ネック部の破断やワイヤ倒れ、ワイヤ垂れが発生しない
と共に、製品の温度サイクル寿命試験において繰り返し
温度変化により発生する応力が母線全体に分散して吸収
され、ボンディング線の破断の最頻発生部位であるネッ
ク部の破断は劇的に減少し、信頼性が向上する。
Therefore, compared to conventional products where the neck part is affected by heat during ball formation and becomes weaker than the bus bar, the neck part does not break during the bonding process, wire falls down, or wire sag occurs, and the product is repeatedly tested during temperature cycle life tests. Stress caused by temperature changes is dispersed and absorbed over the entire generatrix, dramatically reducing the number of fractures at the neck, which is the most common site of bonding wire fracture, and improving reliability.

■ ネック部が破断し難くなるので、ボンディング線の
線径を微細化でき、これに伴いボンディングピッチの短
縮化が可能となり、LSIの高密度実装が図れる。
(2) Since the neck part becomes difficult to break, the wire diameter of the bonding wire can be made finer, thereby making it possible to shorten the bonding pitch and achieving high-density mounting of LSIs.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明の一実施例を示す半導体素子用ボンディン
グ線の拡大縦断面図である。
The drawing is an enlarged vertical cross-sectional view of a bonding wire for a semiconductor device showing an embodiment of the present invention.

Claims (1)

【特許請求の範囲】[Claims]  高純度Pd又はPd合金からなる芯線の外周面に高純
度Pt又はPt合金からなる被覆材を被覆したことを特
徴とする半導体素子用ボンディング線。
A bonding wire for a semiconductor device, characterized in that a core wire made of high-purity Pd or a Pd alloy is covered with a covering material made of high-purity Pt or a Pt alloy.
JP2192793A 1990-07-20 1990-07-20 Bonding wire for semiconductor element Pending JPH0479237A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2192793A JPH0479237A (en) 1990-07-20 1990-07-20 Bonding wire for semiconductor element
US07/729,226 US5364706A (en) 1990-07-20 1991-07-12 Clad bonding wire for semiconductor device
MYPI91001293A MY107874A (en) 1990-07-20 1991-07-18 Clad bonding wire for semiconductor device.
GB9115519A GB2248416B (en) 1990-07-20 1991-07-18 Clad bonding wire for semiconductor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2192793A JPH0479237A (en) 1990-07-20 1990-07-20 Bonding wire for semiconductor element

Publications (1)

Publication Number Publication Date
JPH0479237A true JPH0479237A (en) 1992-03-12

Family

ID=16297090

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2192793A Pending JPH0479237A (en) 1990-07-20 1990-07-20 Bonding wire for semiconductor element

Country Status (1)

Country Link
JP (1) JPH0479237A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2002023618A1 (en) * 2000-09-18 2004-01-22 新日本製鐵株式会社 Semiconductor bonding wire and method of manufacturing the same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2002023618A1 (en) * 2000-09-18 2004-01-22 新日本製鐵株式会社 Semiconductor bonding wire and method of manufacturing the same
JP2010166079A (en) * 2000-09-18 2010-07-29 Nippon Steel Materials Co Ltd Bonding wire for semiconductor and method of manufacturing the same
JP2010166080A (en) * 2000-09-18 2010-07-29 Nippon Steel Materials Co Ltd Bonding wire for semiconductor and method of manufacturing the same
JP2011124611A (en) * 2000-09-18 2011-06-23 Nippon Steel Materials Co Ltd Bonding wire for semiconductor
US7969021B2 (en) 2000-09-18 2011-06-28 Nippon Steel Corporation Bonding wire for semiconductor device and method for producing the same
JP4868694B2 (en) * 2000-09-18 2012-02-01 新日鉄マテリアルズ株式会社 Bonding wire for semiconductor
JP2013080960A (en) * 2000-09-18 2013-05-02 Nippon Steel Sumikin Materials Co Ltd Bonding wire for semiconductor and method of manufacturing the same

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