JP2009256588A - 半導体封止用フィルム状接着剤、半導体装置及びその製造方法 - Google Patents
半導体封止用フィルム状接着剤、半導体装置及びその製造方法 Download PDFInfo
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- JP2009256588A JP2009256588A JP2008265672A JP2008265672A JP2009256588A JP 2009256588 A JP2009256588 A JP 2009256588A JP 2008265672 A JP2008265672 A JP 2008265672A JP 2008265672 A JP2008265672 A JP 2008265672A JP 2009256588 A JP2009256588 A JP 2009256588A
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Classifications
-
- 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
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/11—Manufacturing methods
- H01L2224/113—Manufacturing methods by local deposition of the material of the bump connector
- H01L2224/1133—Manufacturing methods by local deposition of the material of the bump connector in solid form
- H01L2224/1134—Stud bumping, i.e. using a wire-bonding apparatus
-
- 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
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/12—Structure, shape, material or disposition of the bump connectors prior to the connecting process
- H01L2224/13—Structure, shape, material or disposition of the bump connectors prior to the connecting process of an individual bump connector
- H01L2224/13001—Core members of the bump connector
- H01L2224/13099—Material
- H01L2224/131—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
- H01L2224/13138—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
- H01L2224/13144—Gold [Au] as principal constituent
Landscapes
- Epoxy Resins (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Structures Or Materials For Encapsulating Or Coating Semiconductor Devices Or Solid State Devices (AREA)
- Wire Bonding (AREA)
- Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
Abstract
【解決手段】本発明の半導体封止用フィルム状接着剤は、(a)エポキシ樹脂と(b)硬化促進剤とを含有する。そして、(b)硬化促進剤が120℃以上の融点を有し、(b)硬化促進剤の活性領域が120℃以上であることを特徴とする。
【選択図】なし
Description
(上式中、R1、R2及びR3は、それぞれ独立に、水素、アルキル基、フェニル基又はヒドロキシアルキル基を示す。)
(a)エポキシ樹脂は、分子内に2個以上のエポキシ基を有するものであることが好ましい。例えば、ビスフェノールA型、ビスフェノールF型、ナフタレン型、フェノールノボラック型、クレゾールノボラック型、フェノールアラルキル型、ビフェニル型、トリフェニルメタン型、ジシクロペンタジエン型、各種多官能エポキシ樹脂などが好ましい。これらのエポキシ樹脂の1種を単独で又は2種以上を組み合わせて用いることができる。
(b)硬化促進剤は、120℃以上の融点を有し、120〜400℃に活性領域を有するものであることが好ましい。すなわち、活性領域の温度範囲の下限が120℃以上であり、活性領域の温度範囲の上限が400℃以下であることが好ましい。活性領域が400℃を超える場合、半導体チップ実装時のフィルム状接着剤の硬化反応が十分に進行しない傾向がある。なお、活性領域とは、エポキシ樹脂と硬化促進剤とを混ぜ合わせ、昇温した時の発熱ピーク温度であり、例えば、TG−DTA法により、セイコーインスツルメンツ社製のTG−DTA−6200(昇温速度:10℃/分)によって測定することができる。120〜400℃に活性領域を有するものは、半導体チップの実装時の温度領域において優れた硬化促進能力を発揮するため、一層優れた接続安定性を有する半導体装置を製造することができる。
本実施形態のフィルム状接着剤は、(c)重量平均分子量10000以上の高分子成分(以下、便宜上「(c)高分子成分」という。)を含むことが好ましい。(c)高分子成分は、(a)エポキシ樹脂とは異なる樹脂であり、例えば、(a)エポキシ樹脂とは異なるエポキシ樹脂、フェノキシ樹脂、ポリイミド樹脂、ポリアミド樹脂、ポリカルボジイミド樹脂、フェノール樹脂、シアネートエステル樹脂、アクリル樹脂、ポリエステル樹脂、ポリエチレン樹脂、ポリエーテルスルホン樹脂、ポリエーテルイミド樹脂、ポリビニルアセタール樹脂、ウレタン樹脂、アクリルゴム等が挙げられる。その中でも、耐熱性及びフィルム形成性に優れるフィルム状接着剤を得る観点から、(a)エポキシ樹脂とは異なるエポキシ樹脂、フェノキシ樹脂、ポリイミド樹脂、シアネートエステル樹脂、ポリカルボジイミド樹脂等が好ましく、エポキシ樹脂、フェノキシ樹脂、(a)エポキシ樹脂とは異なるポリイミド樹脂がより好ましい。これらの高分子成分は1種を単独で又は2種以上を組み合わせて、或いは2種以上の共重合体として使用することができる。
(d)ポリイミド樹脂は、例えば、テトラカルボン酸二無水物とジアミンとを公知の方法で縮合反応させて得ることができる。より具体的には、有機溶媒中で、テトラカルボン酸二無水物とジアミンとを等モルの比率又はほぼ等モルの比率で配合し(各成分の添加順序は任意)、80℃以下、好ましくは0〜60℃の温度で付加反応させる。反応が進行するにつれて反応液の粘度が徐々に上昇し、ポリイミドの前駆体であるポリアミド酸が生成する。なお、フィルム状接着剤の諸特性の低下を抑えるため、上記のテトラカルボン酸二無水物は無水酢酸で再結晶精製処理を施しておくことが好ましい。
図1は、本発明の好適な実施形態に係る半導体装置の製造方法の第1工程を模式的に示す工程断面図である。第1工程では、まず、半導体チップ14と基板16との間に、半導体封止用フィルム状接着剤12を介在させる。
<(d)ポリイミド樹脂の合成>
温度計、攪拌機及び塩化カルシウム管を備えた300mlフラスコに、1,12−ジアミノドデカン2.10g(0.035モル)、ポリエーテルジアミン(BASF製、ED2000〈分子量:1923〉)17.31g(0.03モル)、1,3−ビス(3−アミノプロピル)テトラメチルジシロキサン(信越化学工業株式会社製、商品名:LP−7100)2.61g(0.035モル)、及びN−メチル−2−ピロリドン(関東化学株式会社製)150gを仕込んで攪拌を行い、溶液を得た。
次に、フィルム状接着剤製造用の原材料として、以下の化合物を準備した。
・クレゾールノボラック型エポキシ樹脂(東都化成株式会社製、商品名:YDCN−702)
・多官能特殊エポキシ樹脂(株式会社プリンテック製、商品名:VG3101L)
・2−フェニル−4,5−ジヒドロキシメチルイミダゾール(四国化成工業株式会社製、商品名:2PHZ−PW、融点:240℃、活性領域:155〜175℃)
・2−フェニル−4−メチル−5−ヒドロキシメチルイミダゾール(四国化成工業株式会社製、商品名:2P4MHZ−PW、融点:193℃、活性領域:140〜150℃)
・2−フェニルイミダゾール(四国化成工業株式会社製、商品名:2PZ−PW、融点:140℃、活性領域:100〜125℃)
・2−フェニル−4−メチルイミダゾール(四国化成工業株式会社製、商品名:2P4MZ−PW、融点:180℃、活性領域:110〜125℃)
・2,4−ジアミノ−6−[2’−メチルイミダゾリル−(1’)]−エチル−s−トリアジンイソシアヌル酸付加体(四国化成工業株式会社製、商品名:2MAOK−PW、融点:260℃、活性領域:130〜145℃)
・クレゾールナフトールホルムアルデヒド重縮合物(日本化薬株式会社製、商品名:カヤハードNHN、重量平均分子量:730)
・窒化ホウ素[水島合金鉄株式会社製、商品名:HPP1−HJ(平均粒子径:1.0μm、最大粒子径:5.1μm)]
・シリカフィラー(日本アエロジル株式会社製、商品名:R972〈平均粒径20nm〉)
ガラス製スクリュー管20mlに、(c)合成ポリイミド樹脂1.62g、エポキシ樹脂(商品名:YDCN−702)0.18g、エポキシ樹脂(商品名:VG3101L)を0.18g、シリカフィラー(商品名:R972)0.11g、窒化ホウ素(商品名:HPP1−HJ)0.70g、硬化促進剤0.0036g、N−メチル−2−ピロリドン(関東化学株式会社製)4.4gを仕込み、撹拌・脱泡装置AR−250(株式会社シンキー製、商品名)で撹拌・脱泡を行って樹脂ワニスを得た。
得られた樹脂ワニスを、基材フィルム(帝人デュポンフィルム(株)製、商品名:ピューレックスA53)に、塗工機PI1210FILMCOATER(テスター産業株式会社製、商品名)で塗工し、クリーンオーブン(エスペツク株式会社製)で乾燥(80℃で30分間及び120℃で30分間乾燥)して、半導体封止用フィルム状接着剤を作製した。
図3は、溶融粘度測定用の試料Aの作製方法を説明するための説明図である。まず、作製したフィルム状接着剤12を、所定のサイズ(直径6mm、厚み約0.1mm)に切断して厚み0.7mmのガラスチップ11(サイズ:15mm×15mm)上に貼付した。その後、図3に示すように、厚み0.12〜0.17mmのカバーガラス13(サイズ:18mm×18mm)を被せて、ガラスチップ11、フィルム状接着剤12及びカバーガラス13が順次積層された試料Aを作製した。
μ:溶融粘度(Pa・s)
F:荷重(N)
t:加熱加圧時間(秒)
Z0:初期厚み(m)
Z:加圧後厚み(m)
V:樹脂体積(m3)
図4(A)は接続抵抗の評価に用いた半導体装置を上方(半導体チップ側)から撮影した写真であり、図4(B)は接続抵抗の評価に用いた半導体装置の断面を撮影した写真である。接続抵抗評価用の半導体装置は次の通りにして作製した。
図5は、ボイド発生率測定用の試料Bの作製方法を説明するための説明図である。作製したフィルム状接着剤を所定のサイズ(5mm×5mm×厚み0.03mm)に切断し、図5に示すように、フィルム状接着剤12をガラスチップ11(15mm×15mm×厚み0.7mm)上に貼付した。フィルム状接着剤12の上に、金バンプ15が形成されたチップ14(4.26mm×4.26mm×厚み0.27mm、バンプ高さ:0.02mm)を被せて、試料Bを作製した。
rage Test)>
図6は、絶縁信頼性試験に用いた試料Cを上方から撮影した写真である。試料Cは以下の通りにして作製した。
使用した原材料の組成を下記の表1に示したように変更したことを除いては、実施例1の半導体封止用フィルム状接着剤の作製方法と同様にして、半導体封止用フィルム状接着剤を作製し、各評価を行った。半導体封止用フィルム状接着剤の原材料の配合量(質量部)と評価結果とを纏めて表1に示す。
Claims (12)
- (a)エポキシ樹脂と(b)硬化促進剤とを含有しており、
前記(b)硬化促進剤は120℃以上の融点を有し、
前記(b)硬化促進剤の活性領域が120℃以上である半導体封止用フィルム状接着剤。 - (c)重量平均分子量10000以上の高分子成分を含有する請求項1記載の半導体封止用フィルム状接着剤。
- (d)ポリイミド樹脂を含有する請求項1又は2記載の半導体封止用フィルム状接着剤。
- 前記(d)ポリイミド樹脂は、30000以上の重量平均分子量を有し、且つ100℃以下のガラス転移温度を有する請求項3記載の半導体封止用フィルム状接着剤。
- 前記(b)硬化促進剤がイミダゾール類を含有する請求項1〜4のいずれか一項に記載の半導体封止用フィルム状接着剤。
- 前記(b)硬化促進剤が、下記一般式(1)で表される化合物を含有する請求項1〜5のいずれか一項に記載の半導体封止用フィルム状接着剤。
(上式中、R1、R2及びR3は、それぞれ独立に、水素、アルキル基、フェニル基又はヒドロキシアルキル基を示す。) - 前記一般式(1)で表される前記化合物における前記R1が水素である請求項6に記載の半導体封止用フィルム状接着剤。
- 前記一般式(1)で表される前記化合物における前記R2及びR3の少なくとも一方がヒドロキシアルキル基である請求項6又は7に記載の半導体封止用フィルム状接着剤。
- 前記(a)エポキシ樹脂が、室温(1気圧、25℃)で固形である請求項1〜8のいずれか一項に記載の半導体封止用フィルム状接着剤。
- バンプを有する半導体チップと金属配線を有する基板とを備える半導体装置の製造方法であって、
前記半導体チップと前記基板とを、請求項1〜9のいずれか一項に記載の半導体封止用フィルム状接着剤を介して前記バンプと前記金属配線とが互いに対向するように配置し、
前記半導体チップと前記基板とを対向する方向に加圧するとともに加熱して前記半導体封止用フィルム状接着剤を硬化させ、前記バンプと前記金属配線とを電気的に接続する接続工程を有する製造方法。 - 前記接続工程では、前記半導体チップと前記基板とを対向する方向に加圧するとともに300℃以上に加熱して、金を含有する前記バンプとスズめっき層を有する前記金属配線との間に金−スズ共晶を形成し、前記バンプと前記金属配線とを電気的に接続する請求項10記載の製造方法。
- 請求項10又は11に記載の製造方法によって得られる半導体装置。
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