JP2014179412A - ボンディング用ワイヤ - Google Patents
ボンディング用ワイヤ Download PDFInfo
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- JP2014179412A JP2014179412A JP2013051577A JP2013051577A JP2014179412A JP 2014179412 A JP2014179412 A JP 2014179412A JP 2013051577 A JP2013051577 A JP 2013051577A JP 2013051577 A JP2013051577 A JP 2013051577A JP 2014179412 A JP2014179412 A JP 2014179412A
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- Prior art keywords
- wire
- mass
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- less
- ball
- 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.)
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- 238000000034 method Methods 0.000 claims abstract description 40
- 229910052737 gold Inorganic materials 0.000 claims abstract description 39
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 31
- 229910052802 copper Inorganic materials 0.000 claims abstract description 27
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 17
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 13
- 239000004065 semiconductor Substances 0.000 claims description 21
- 239000004020 conductor Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 4
- 239000010931 gold Substances 0.000 abstract description 62
- 229910052709 silver Inorganic materials 0.000 abstract description 10
- 239000004332 silver Substances 0.000 abstract description 9
- 229910052791 calcium Inorganic materials 0.000 abstract description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 47
- 239000010949 copper Substances 0.000 description 26
- 239000013078 crystal Substances 0.000 description 21
- 238000010265 fast atom bombardment Methods 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 19
- 239000011575 calcium Substances 0.000 description 16
- 238000011156 evaluation Methods 0.000 description 13
- 229920005989 resin Polymers 0.000 description 12
- 239000011347 resin Substances 0.000 description 12
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 11
- 238000007789 sealing Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005496 tempering Methods 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- 229910001316 Ag alloy Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 150000002343 gold Chemical class 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010944 silver (metal) Substances 0.000 description 1
- 229910001923 silver oxide Inorganic materials 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 229910002058 ternary alloy Inorganic materials 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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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
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C5/06—Alloys based on silver
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- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C5/02—Alloys based on gold
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Abstract
【解決手段】Agを主成分とし、Auの添加量を0.9質量%以上2.6質量%以下、Pdの添加量を0.1質量%以上1.5質量%以下、かつAuとPdの添加量の合計を1.0質量%以上3.0質量%以下、かつAuとPdの添加量の合計を1.0質量%以上3.0質量%以下、Ca、希土類元素から選ばれる1種以上の元素を合計で20質量ppm以上、500質量ppm以下、Cu、Niから選ばれる1種以上の元素を合計で1000質量ppm以上10000質量ppm以下のワイヤWである。そのワイヤWの0.2%耐力と同引張強さとの比が90%以上、同固有抵抗は3.0μΩ・cm以下である。このワイヤWは、ボールボンディング法とスタッドバンプ法の組み合わせによる接続を安定して行える。
【選択図】図3
Description
また、電極aとパッケージ基板3の導体配線(端子)cとの電気接続では、ボールボンディング法によって接合が行われた後、接合信頼性を高めるためにステッチボンド部の上にスタッドバンプを設けることが行われる(セキュリティボンド)。
さらに、半導体パッケージの低背化のために、パッケージ基板3の導体配線(端子)cに1stボンドを形成し、電極aにステッチボンドを行うこともなされるが、その場合、事前に電極aにスタッドバンプを形成しておき、その上にステッチボンドを行う(逆ボンド)。
このように、半導体パッケージにおける半導体素子5の電極aとパッケージ基板3の導体配線(端子)cとの電気接続ではボールボンディング法とスタッドバンプ法の組み合わせで接合が行われることがある。
つぎに、同図(h)に示すように、この溶融ボールbをグリップしたキャピラリー10aは導体配線cの真上まで移動した後、導体配線cに向かって降下し、押し付けられる(同図(i)。これと同時に、その押付け部位に熱・荷重・超音波を与え、それによって溶融ボールbが圧着されて(圧着ボールb’となって)導体配線cと固相接合された後、クランプ10bが開いて上昇しつつ電極a上に向かって移動する(同図(j)〜(k))。このとき、安定したループを形成するため、キャピラリー10aに特殊な動きをさせてワイヤWに「くせ」を付ける動作をする場合がある(同図(k)の鎖線から実線参照)。
Pd被覆銅ボンディングワイヤは、銅ボンディングワイヤに比べて2nd接合性がよく、連続ボンディング性がよいが、FABが銅ボンディングワイヤよりもさらに硬くなるため、チップダメージ発生の問題がある。
そのためには、ボンディングワイヤの直径を小さくする必要があるが、ワイヤの電気抵抗はワイヤの直径と反比例するため、ワイヤ自体の電気抵抗が高いと、ワイヤの直径を小さくすることができなくなる問題がある。また、LED15においては、光度を上げるために動作電流が高くなってきているが、ワイヤの電気抵抗が高いと発熱の問題が生じ、封止樹脂の寿命を縮める不具合が生じる。
PdとAuの添加量の合計が8.0質量%を超えた量を添加すると、ワイヤの電気抵抗が高くなる。また、ボールbの硬度が高くなり、1st接合時に電極aが損傷する。さらに、添加量の合計が3.0質量%を下回れば、ワイヤの電気抵抗が金ワイヤに近くなるため、ワイヤ径を小さくすることが可能になる。
ここで、希土類元素は入手性に難があるため、Caの添加が最も好ましい。また、希土類元素の中では極微量の添加でワイヤの耐熱性・強度向上に効果があるY、Gdおよび添加元素とAgが化合物を作ることによってマトリックスであるAg中に化合物が分散しワイヤの高強度化に寄与するLa、Ceが好ましい。
この100×YS/TSが80%を下回ると、ワイヤの大部分が再結晶し結晶組織が大きくなるが、80%以上であると再結晶はワイヤの一部に留まり、結晶粒も一部が大きくなる程度である。さらに、90%以上であると、結晶粒は大部分が微細なままの変形組織となる。
『評価項目』
各ワイヤWについて、自動ワイヤボンダで、図3(a)〜(f)に示す方法でスタッドバンプb’を連続して作製する評価を行った。すなわち、放電棒gによるアーク放電によりワイヤW先端にFAB(ボールb)を作製し、それをAl被覆電極上に押し付けてスタッドバンプb’を連続で作製した。なお、FAB作製時にはワイヤW先端部に窒素(N2)ガスを流しながらアーク放電を行った。
また、図3(a)〜(o)に示すスタッドバンプ法−ボールボンディング法の組み合わせによる接続をAg被覆42Ni−Fe板上で行った。
評価に用いたボンディング試料における連続バンプ性、スタッドバンプ部のチップ損傷、電気抵抗、樹脂封止時のワイヤフロー、及び総合評価を表2に示す。それらの評価方法等は以下の通りである。
「連続バンプ性」
ボンディングマシンで10,000回の連続バンプ形成を行った。ここで、マシンストップが発生しなければ「A」、ワイヤの切断がうまくいかずに1回のマシンストップが発生すれば「B」、2回以上のマシンストップが起これば「D」とした。
半導体素子5のスタッドバンプ部および電極膜を王水で溶解し、クラックを光学顕微鏡と走査型電子顕微鏡(SEM)で観察した。100個の接合部を観察して3μm未満の微小なピットが1個もしくはまったく見られない場合は「A」、3μm以上のクラックが2個以上5個未満認められた場合は使用上問題はないと考えて「B」、3μm以上のクラックが5個以上認められた場合は「D」とした。
ワイヤ長:5mmのボンディング試料をエポキシ樹脂で封止した後で、X線非破壊観察装置にて最大ワイヤフロー量を測定した。測定は20本行い、その平均値をワイヤ長5mmで除した割合をワイヤフロー率とした。このワイヤフロー率が5%未満なら「A」、5%以上7%未満では「B」、7%以上では実用上の問題があると考えて評価を「D」とした。
4端子法を用いて室温での電気抵抗を測定した。3試料の固有抵抗の平均が3.0μΩ・cm以下であれば金ワイヤからの置き換えにあたって電気特性の変化が少ないため「A」、3.0μΩ・cmを上回って5.0μΩ・cm以下であれば金ワイヤからの置き換えにあたって実用上の問題が少ないため「B」、5.0μΩ・cmを超えれば金ワイヤからの置き換えには向かないと考えて「D」とした。
本ワイヤWが検討される大きな要因は金ワイヤを銀ワイヤに置き換える時に発生するコストメリットである。このため、ワイヤWのコストについても大きな比較要因となる。ここで、ワイヤWがAuを5質量%を超えて含有していると、Auワイヤからの置き換えが進みにくいと考えて「D」、2.6質量%を超えて5質量%以下であればある程度のコストメリットが見いだせるので「B」、2.6質量%以下であればコストメリットが大きいと考えて「A」とした。
ワイヤボンダで各線径の2倍の大きさのFABをそれぞれ100個作製し、FABのワイヤと平行な方向と直角な方向の径を測定した。このそれぞれの径の差が2μm以下であれば、真球に近いと考えて「A」、2μmを超えると真球度が低いと考えて「D」とした。
電極へのボンディング後、1stボール接合部の耐食性を評価するために130℃/85%雰囲気中に168時間放置するHAST(Highly Accelerated Stress Test)を行った。ここで、HAST前後のシア強度を測定し、HAST前のシア強度(SSbとする)とHAST後のシア強度(SSaとする)の比(SSa/SSb×100)が70%を上回れば、耐食性があると考えて「A」、70%未満となれば耐食性に問題があると考えて「D」とした。なお、HAST前後のシア強度の測定はn=30ずつ行った。
各評価において、すべてが「A」であるものを「A」、「A」と「B」が混在するものを「B」、一つでも「D」があるものは「D」とした。
また、Pdの添加量が0.1質量%未満であったり、添加されなかったりすると、比較例2、7、11から、「HAST」が「D」となり、5.0質量%を超えると、比較例4から、「スタッドバンプ部真下のチップ損傷」が「D」となる。
さらに、AuとPdの添加量の合計が1.0質量%未満であると、「樹脂封止時のワイヤフロー」が比較例1、6は「D」となり、一方、比較例7は、AuとPdの添加量の合計が1.0質量%未満であるものの、後述のCa、希土類元素から選ばれる1種以上の元素が合計で350質量ppm添加されているため、「樹脂封止時のワイヤフロー」は「B」となる。また、AuとPdの添加量の合計が8質量%を超えると、比較例5、8から、「電気抵抗」が「D」となる。
ワイヤWの0.2%耐力(YS)と同引張強さ(TS)との比が80%未満であると、比較例2、3、8〜10から「連続バンプ性」が「D」となる。
さらに、Auの添加量を0.9質量%以上2.6質量%以下、Pdの添加量を0.1質量%以上1.5質量%以下、かつAuとPdの添加量の合計を1.0質量%以上3.0質量%以下含むものであると、試作例1〜3、6〜8から「スタッドバンプ部真下のチップ損傷」、「電気抵抗」、「Auワイヤからの置き換え」、「FABの真球度」、「HAST」において「A」となり、優れていることが理解できる。
ワイヤWの固有抵抗が5.0μΩ・cmを超えると、比較例5、8から、「電気抵抗」が「D」となる。一方、同固有抵抗が3.0μΩ・cm以下に抑えられると、試作例1〜8、10、11、15、比較例1〜3、6、7、11から「電気抵抗」が「A」となる。
5 半導体素子
15 LED
W ボンディング用ワイヤ
a 半導体素子(LED)の電極
b 溶融ボール
b’ 圧着ボール(スタッドバンプ)
c 回路配線基板の導体配線(リード端子)
Claims (7)
- 半導体素子(5、15)の電極(a)と回路配線基板(3、13)の導体配線(c)とをボールボンディング法およびスタッドバンプ法の組合せによって接続するためのボンディング用ワイヤ(W)であって、
Agを主成分とし、Auの添加量を0.9質量%以上5.0質量%以下、Pdの添加量を0.1質量%以上5.0質量%以下、かつAuとPdの添加量の合計を1.0質量%以上8質量%以下とし、
そのワイヤ(W)の0.2%耐力と同引張強さとの比が80%以上であることを特徴とするボンディング用ワイヤ。 - 上記ワイヤ(W)の組成に、さらにCa、希土類元素から選ばれる1種以上の元素を合計で20質量ppm以上、500質量ppm以下含むことを特徴とする請求項1に記載のボンディング用ワイヤ。
- 上記ワイヤ(W)の組成に、さらにCu、Niから選ばれる1種以上の元素を合計で1000質量ppm以上、10000質量ppm以下含むことを特徴とする請求項2に記載のボンディング用ワイヤ。
- 上記ワイヤ(W)のAuの添加量を0.9質量%以上2.6質量%以下、Pdの添加量を0.1質量%以上1.5質量%以下、かつAuとPdの添加量の合計を1.0質量%以上3.0質量%以下含むことを特徴とする請求項2又は3に記載のボンディング用ワイヤ。
- 上記ワイヤ(W)の0.2%耐力と同引張強さとの比が90%以上であることを特徴とする請求項1〜4の何れか一つに記載のボンディング用ワイヤ。
- 上記ワイヤ(W)の固有抵抗が5.0μΩ・cm以下であることを特徴とする請求項1〜5の何れか一つに記載のボンディング用ワイヤ。
- 上記ワイヤ(W)の固有抵抗が3.0μΩ・cm以下であることを特徴とする請求項1〜5の何れか一つに記載のボンディング用ワイヤ。
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WO2017154453A1 (ja) * | 2016-03-11 | 2017-09-14 | タツタ電線株式会社 | ボンディングワイヤ |
KR20180039015A (ko) * | 2015-09-29 | 2018-04-17 | 헤라우스 매터리얼즈 싱가포르 피티이 엘티디 | 은 합금 와이어 |
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WO2021065036A1 (ja) * | 2019-10-01 | 2021-04-08 | 田中電子工業株式会社 | ワイヤ接合構造とそれに用いられるボンディングワイヤ及び半導体装置 |
CN111029267B (zh) * | 2019-11-22 | 2021-12-24 | 中国电子科技集团公司第十三研究所 | 一种倒装互连结构及其制备方法 |
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