JP4349641B1 - ボールボンディング用被覆銅ワイヤ - Google Patents
ボールボンディング用被覆銅ワイヤ Download PDFInfo
- Publication number
- JP4349641B1 JP4349641B1 JP2009069462A JP2009069462A JP4349641B1 JP 4349641 B1 JP4349641 B1 JP 4349641B1 JP 2009069462 A JP2009069462 A JP 2009069462A JP 2009069462 A JP2009069462 A JP 2009069462A JP 4349641 B1 JP4349641 B1 JP 4349641B1
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- Prior art keywords
- copper
- core material
- ball
- bonding
- wire
- 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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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 239000010949 copper Substances 0.000 claims abstract description 148
- 229910052802 copper Inorganic materials 0.000 claims abstract description 90
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 82
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 80
- 239000011162 core material Substances 0.000 claims abstract description 58
- 239000010931 gold Substances 0.000 claims abstract description 51
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 27
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 26
- 229910052737 gold Inorganic materials 0.000 claims abstract description 25
- 239000010410 layer Substances 0.000 claims description 61
- 229910052698 phosphorus Inorganic materials 0.000 claims description 34
- 239000011574 phosphorus Substances 0.000 claims description 34
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 33
- 239000011247 coating layer Substances 0.000 claims description 20
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 230000003647 oxidation Effects 0.000 abstract description 10
- 238000007254 oxidation reaction Methods 0.000 abstract description 10
- 229910052709 silver Inorganic materials 0.000 abstract description 4
- 239000004332 silver Substances 0.000 abstract description 4
- 229910000881 Cu alloy Inorganic materials 0.000 abstract description 2
- 229910001096 P alloy Inorganic materials 0.000 abstract 1
- RIRXDDRGHVUXNJ-UHFFFAOYSA-N [Cu].[P] Chemical compound [Cu].[P] RIRXDDRGHVUXNJ-UHFFFAOYSA-N 0.000 abstract 1
- 238000007747 plating Methods 0.000 description 23
- 239000010408 film Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 230000008018 melting Effects 0.000 description 13
- 238000002844 melting Methods 0.000 description 13
- 239000004065 semiconductor Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000012535 impurity Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 230000002950 deficient Effects 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 238000007740 vapor deposition Methods 0.000 description 5
- 239000012298 atmosphere Substances 0.000 description 4
- 238000009713 electroplating Methods 0.000 description 4
- 229910000510 noble metal Inorganic materials 0.000 description 4
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 3
- 239000005751 Copper oxide Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 229910001252 Pd alloy Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910000431 copper oxide Inorganic materials 0.000 description 3
- 238000006392 deoxygenation reaction Methods 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000007772 electroless plating Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000000682 scanning probe acoustic microscopy Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910017755 Cu-Sn Inorganic materials 0.000 description 1
- 229910017927 Cu—Sn Inorganic materials 0.000 description 1
- 229910021069 Pd—Co Inorganic materials 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- IZLAVFWQHMDDGK-UHFFFAOYSA-N gold(1+);cyanide Chemical compound [Au+].N#[C-] IZLAVFWQHMDDGK-UHFFFAOYSA-N 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000003887 surface segregation Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/302—Cu as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
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Abstract
【解決手段】 銅−リン合金からなる芯材と、該芯材の上にパラジウムまたは白金からなる中間層と、該中間層の上に金または銀からなる表皮層を有するボンディングワイヤであることを特徴とする被覆銅ワイヤである。
【選択図】 なし
Description
(1)銅(Cu)を主成分とする芯材と、該芯材の上に2種類の被覆層を有するボールボンディング用被覆銅ワイヤであって、前記芯材が銅(Cu)−1〜500質量ppmリン(P)合金からなり、かつ、前記被覆層がパラジウム(Pd)または白金(Pt)の中間層および金(Au)の表皮層とからなることを特徴とするボールボンディング用被覆銅ワイヤ。
(2)銅(Cu)を主成分とする芯材と、該芯材の上に2種類の被覆層を有するボールボンディング用被覆銅ワイヤであって、前記芯材が銅(Cu)−1〜80質量ppmリン(P)合金からなり、かつ、前記被覆層がパラジウム(Pd)または白金(Pt)の中間層および金(Au)の表皮層とからなることを特徴とするボールボンディング用被覆銅ワイヤ。
(3)銅(Cu)を主成分とする芯材と、該芯材の上に2種類の被覆層を有するボールボンディング用被覆銅ワイヤであって、前記芯材が銅(Cu)−200〜400質量ppmリン(P)合金からなり、かつ、前記被覆層がパラジウム(Pd)または白金(Pt)の中間層および金(Au)の表皮層とからなることを特徴とするボールボンディング用被覆銅ワイヤ。
(4)リン(P)以外の芯材の成分が純度99.999質量%以上の銅(Cu)である上記(1)〜(3)の何れかに記載のボールボンディング用被覆銅ワイヤ。
(5)リン(P)以外の芯材の成分が純度99.9999質量%以上の銅(Cu)である上記(1)〜(3)の何れかに記載のボールボンディング用被覆銅ワイヤ。
(6)中間層の厚さが0.005〜0.2μmである上記(1)〜(3)の何れかに記載のボールボンディング用被覆銅ワイヤ。
(7)中間層の厚さが0.01〜0.1μmである上記(1)〜(3)の何れかに記載のボールボンディング用被覆銅ワイヤ。
(8)表皮層の厚さが0.005〜0.1μmである上記(1)〜(3)の何れかに記載のボールボンディング用被覆銅ワイヤ。
(9)表皮層の厚さが中間層の厚さよりも薄いものである上記(1)〜(3)の何れかに記載のボールボンディング用被覆銅ワイヤ。
所定量のリン(P)を含有させた純度の銅(Cu)インゴットから500μmの線径まで伸線加工した銅ワイヤを芯材とし、そのワイヤ表面にストライクメッキをしてから通常の方法で電解メッキを行った。中間層としてパラジウム(Pd)及び/又は白金(Pt)を被覆した3種類の線材を用意し、表皮層としてこの3種類の線材に金(Au)を直接被覆した。メッキ浴は、半導体用途で市販されているメッキ液メッキ浴を使用した。具体的には、パラジウム(Pd)は中性のジニトロジアンミンパラジウム浴に10gW/lのリン酸塩を添加したもの、白金(Pt)は酸性のPt−pソルト浴、金(Au)は中性のシアン化金浴に100gW/lのリン酸塩を添加したものをそれぞれ使用した。その後、この被覆銅ワイヤを最終径の25μmまでダイス伸線して、最後に加工歪みを取り除き、伸び値が10%程度になるように熱処理を施した。最終のめっき厚等は、表1のとおりである。なお、メッキ厚はオージェ電子分光法(AES)で測定した。
(接合温度:200℃。初期ボール径:40〜60μm)
試験結果を表2に示す。
表2には、本発明に係る被覆銅ワイヤの評価結果を示している。
実施例5、8、15、18、及び20〜22に係る5〜10のボンディングワイヤは、上記の実施例1〜5のに係るボンディングワイヤよりやや劣るものの、ボール部の真球性、真円性に優れ、チップダメージも少なく、ステッチ接合性、圧着形状がよいことが確認された。
実施例11〜13に係るボンディングワイヤは、上記の実施例に係るボンディングワイヤより少し劣るものの、実施例1〜5のボンディングワイヤと同様に、ボール部の真球性、真円性に優れ、及びチップダメージも少なくに比較例のような欠陥がなく、ウェッジ接合性、圧着形状がよいことが確認された。なお、実施例13のボンディングワイヤは、実施例11、12のボンディングワイヤと同様の結果を示した。
Claims (9)
- 銅(Cu)を主成分とする芯材と、該芯材の上に2種類の被覆層を有するボールボンディング用被覆銅ワイヤであって、前記芯材が銅(Cu)−1〜500質量ppmリン(P)合金からなり、かつ、前記被覆層がパラジウム(Pd)または白金(Pt)の中間層および金(Au)の表皮層とからなることを特徴とするボールボンディング用被覆銅ワイヤ。
- 銅(Cu)を主成分とする芯材と、該芯材の上に2種類の被覆層を有するボールボンディング用被覆銅ワイヤであって、前記芯材が銅(Cu)−1〜80質量ppmリン(P)合金からなり、かつ、前記被覆層がパラジウム(Pd)または白金(Pt)の中間層および金(Au)の表皮層とからなることを特徴とするボールボンディング用被覆銅ワイヤ。
- 銅(Cu)を主成分とする芯材と、該芯材の上に2種類の被覆層を有するボールボンディング用被覆銅ワイヤであって、前記芯材が銅(Cu)−200〜400質量ppmリン(P)合金からなり、かつ、前記被覆層がパラジウム(Pd)または白金(Pt)の中間層および金(Au)の表皮層とからなることを特徴とするボールボンディング用被覆銅ワイヤ。
- リン(P)以外の芯材の成分が純度99.999質量%以上の銅(Cu)である請求項1〜請求項3の何れか1項に記載のボールボンディング用被覆銅ワイヤ。
- リン(P)以外の芯材の成分が純度99.9999質量%以上の銅(Cu)である請求項1〜請求項3の何れか1項に記載のボールボンディング用被覆銅ワイヤ。
- 中間層の厚さが0.005〜0.2μmである請求項1〜請求項3の何れか1項に記載のボールボンディング用被覆銅ワイヤ。
- 中間層の厚さが0.01〜0.1μmである請求項1〜請求項3の何れか1項に記載のボールボンディング用被覆銅ワイヤ。
- 表皮層の厚さが0.005〜0.1μmである請求項1〜請求項3の何れか1項に記載のボールボンディング用被覆銅ワイヤ。
- 表皮層の厚さが中間層の厚さよりも薄いものである請求項1〜請求項3の何れか1項に記載のボールボンディング用被覆銅ワイヤ。
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