JPWO2017013817A1 - 半導体装置用ボンディングワイヤ - Google Patents
半導体装置用ボンディングワイヤ Download PDFInfo
- Publication number
- JPWO2017013817A1 JPWO2017013817A1 JP2016507915A JP2016507915A JPWO2017013817A1 JP WO2017013817 A1 JPWO2017013817 A1 JP WO2017013817A1 JP 2016507915 A JP2016507915 A JP 2016507915A JP 2016507915 A JP2016507915 A JP 2016507915A JP WO2017013817 A1 JPWO2017013817 A1 JP WO2017013817A1
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- Prior art keywords
- wire
- coating layer
- bonding
- core material
- bonding wire
- Prior art date
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- 229910052709 silver Inorganic materials 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 229910000881 Cu alloy Inorganic materials 0.000 abstract description 69
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- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
- H01L24/01—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
- 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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- 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
- H01L24/01—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
- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L24/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
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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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0227—Rods, wires
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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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C9/04—Alloys based on copper with zinc as the next major constituent
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- 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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- 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
- B23K2101/00—Articles made by soldering, welding or cutting
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- H01L2224/0554—External layer
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- H01L2224/05617—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
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- H01L2224/431—Pre-treatment of the preform connector
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Abstract
Description
(1)Cuを主成分とし、元素周期表第10族の金属元素を総計で0.1〜3.0質量%含有する芯材と、該芯材表面に設けられたPdを主成分とする被覆層と、該被覆層表面に設けられたAuとPdを含む表皮合金層とを含む半導体装置用ボンディングワイヤにおいて、ワイヤ最表面におけるCu濃度が1〜10at%であることを特徴とする半導体装置用ボンディングワイヤ。
(2)前記元素周期表第10族の金属元素が、Ni、Pd及びPtからなる群から選択される1種以上であることを特徴とする(1)に記載の半導体装置用ボンディングワイヤ。
(3)前記元素周期表第10族の金属元素が、Niを含むことを特徴とする(1)又は(2)に記載の半導体装置用ボンディングワイヤ。
(4)前記Pdを主成分とする被覆層の厚さが20〜90nm、前記AuとPdを含む表皮合金層の厚さが0.5〜40nm、Auの最大濃度が15〜75at%であることを特徴とする(1)乃至(3)のいずれかに記載の半導体装置用ボンディングワイヤ。
(5)前記芯材が、さらにAuを含有し、芯材中のNi、Pd、Pt、Auの総計が0.1質量%を超え3.0質量%以下であることを特徴とする(1)乃至(4)のいずれかに記載の半導体装置用ボンディングワイヤ。
(6)前記ボンディングワイヤが、さらにP、B、Be、Fe、Mg、Ti、Zn、Ag、Siの1種以上を含有し、ワイヤ全体に占めるこれら元素濃度の総計が0.0001〜0.01質量%の範囲であることを特徴とする(1)乃至(5)のいずれかに記載の半導体装置用ボンディングワイヤ。
(7)前記芯材と前記被覆層との境界部、および前記被覆層と前記表皮合金層との境界部に拡散領域を有することを特徴とする(1)乃至(6)のいずれかに記載の半導体装置用ボンディングワイヤ。
(8)前記ボンディングワイヤのワイヤ軸に垂直方向の芯材断面(以下「垂直断面」という。)に対して結晶方位を測定した結果において、ワイヤ長手方向の結晶方位の内、ワイヤ長手方向に対して角度差が15°以下である結晶方位<100>の方位比率が30%以上であることを特徴とする(1)乃至(7)のいずれかに記載の半導体装置用ボンディングワイヤ。
前述のようにCu合金芯材の酸化を抑制するため、Cu合金芯材の表面に形成するPdを主成分とする被覆層の厚みは20〜90nmが好ましい。被覆層の厚みが20nm以上であれば酸化抑制効果が充分となり、2nd接合性とFAB形状が良好となるため好ましい。なお、FAB形状とは、真球性、偏芯の有無、および引け巣の有無を意味する。被覆層の厚みは、より好ましくは25nm以上、又は30nm以上である。また、被覆層の厚みが90nm以下であれば、チップダメージが低減すると共にFAB形状が良好となり、さらにボール部の表面に直径数μmの大きさの気泡が生じることが少なく、好ましい。被覆層の厚みは、より好ましくは85nm以下、又は80nm以下である。
前述のとおり、Cu合金芯材の表面にPdを主成分とする被覆層を有する構成のみでは、Pdめっきリードフレーム上で良好な2nd接合性を確保することはできない。本発明においては、Pdを主成分とする被覆層の表面に更にAuとPdを含む表皮合金層を形成する。AuとPdを含む表皮合金層の厚さは0.5〜40nmが好ましい。ワイヤの最表面の領域がAuとPdとの合金層であれば、Pdめっきリードフレーム上にワイヤを2nd接合させる際、ワイヤの最表面を構成する表皮合金層中のAuがPdめっきリードフレーム上のPdに向けて優先的に拡散し、ボンディングワイヤとPdめっきリードフレームの両者の間に合金層を形成しやすくする。そのため、Pdめっきリードフレームとの2nd接合性が向上する。また、AuフラッシュめっきされたPdめっきリードフレーム上でも同様に2nd接合性が向上することを確認しており、この場合はリードフレーム上の極薄フラッシュメッキのAuと表皮合金層中のAuのお互いの密着性促進効果によると考えられる。PdめっきリードフレームあるいはPdめっきの上にAuめっきを施したリードフレームに対する2nd接合性を改善する観点から、表皮合金層の厚みは好ましくは0.5nm以上、より好ましくは1nm以上、2nm以上、又は3nm以上である。一方、表皮合金層の厚みが厚すぎると、FAB形状が悪化する場合があり、また、高価なAuの使用量が増えてコストアップとなることから、表皮合金層の厚みは好ましくは40nm以下、より好ましくは35nm以下、又は30nm以下である。
Claims (8)
- Cuを主成分とし、元素周期表第10族の金属元素を総計で0.1〜3.0質量%含有する芯材と、該芯材表面に設けられたPdを主成分とする被覆層と、該被覆層表面に設けられたAuとPdを含む表皮合金層とを含む半導体装置用ボンディングワイヤにおいて、ワイヤ最表面におけるCu濃度が1〜10at%であることを特徴とする半導体装置用ボンディングワイヤ。
- 前記元素周期表第10族の金属元素が、Ni、Pd及びPtからなる群から選択される1種以上であることを特徴とする請求項1に記載の半導体装置用ボンディングワイヤ。
- 前記元素周期表第10族の金属元素が、Niを含むことを特徴とする請求項1又は2に記載の半導体装置用ボンディングワイヤ。
- 前記Pdを主成分とする被覆層の厚さが20〜90nm、前記AuとPdを含む表皮合金層の厚さが0.5〜40nm、Auの最大濃度が15〜75at%であることを特徴とする請求項1乃至3のいずれかに記載の半導体装置用ボンディングワイヤ。
- 前記芯材が、さらにAuを含有し、芯材中のNi、Pd、Pt、Auの総計が0.1質量%を超え3.0質量%以下であることを特徴とする請求項1乃至4のいずれかに記載の半導体装置用ボンディングワイヤ。
- 前記ボンディングワイヤが、さらにP、B、Be、Fe、Mg、Ti、Zn、Ag、Siの1種以上を含有し、ワイヤ全体に占めるこれら元素濃度の総計が0.0001〜0.01質量%の範囲であることを特徴とする請求項1乃至5のいずれかに記載の半導体装置用ボンディングワイヤ。
- 前記芯材と前記被覆層との境界部、および前記被覆層と前記表皮合金層との境界部に拡散領域を有することを特徴とする請求項1乃至6のいずれかに記載の半導体装置用ボンディングワイヤ。
- 前記ボンディングワイヤのワイヤ軸に垂直方向の芯材断面(以下「垂直断面」という。)に対して結晶方位を測定した結果において、ワイヤ長手方向の結晶方位の内、ワイヤ長手方向に対して角度差が15°以下である結晶方位<100>の方位比率が30%以上であることを特徴とする請求項1乃至7のいずれかに記載の半導体装置用ボンディングワイヤ。
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JP6167227B2 (ja) | 2014-04-21 | 2017-07-19 | 新日鉄住金マテリアルズ株式会社 | 半導体装置用ボンディングワイヤ |
CN104051080B (zh) | 2014-07-03 | 2016-06-15 | 深圳市凯中和东新材料有限公司 | 绝缘性导线的制备方法 |
US9368470B2 (en) | 2014-10-31 | 2016-06-14 | Freescale Semiconductor, Inc. | Coated bonding wire and methods for bonding using same |
JP5807992B1 (ja) * | 2015-02-23 | 2015-11-10 | 田中電子工業株式会社 | ボールボンディング用パラジウム(Pd)被覆銅ワイヤ |
JP5912008B1 (ja) | 2015-06-15 | 2016-04-27 | 日鉄住金マイクロメタル株式会社 | 半導体装置用ボンディングワイヤ |
MY162048A (en) | 2015-06-15 | 2017-05-31 | Nippon Micrometal Corp | Bonding wire for semiconductor device |
EP3136435B1 (en) | 2015-07-23 | 2022-08-31 | Nippon Micrometal Corporation | Bonding wire for semiconductor device |
MY162884A (en) | 2015-08-12 | 2017-07-20 | Nippon Micrometal Corp | Bonding wire for semiconductor device |
JP6002300B1 (ja) | 2015-09-02 | 2016-10-05 | 田中電子工業株式会社 | ボールボンディング用パラジウム(Pd)被覆銅ワイヤ |
JP6047214B1 (ja) | 2015-11-02 | 2016-12-21 | 田中電子工業株式会社 | ボールボンディング用貴金属被覆銅ワイヤ |
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