JP2004256695A - Adhesive sheet, semiconductor device using the same and method for producing the same - Google Patents

Adhesive sheet, semiconductor device using the same and method for producing the same Download PDF

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JP2004256695A
JP2004256695A JP2003049566A JP2003049566A JP2004256695A JP 2004256695 A JP2004256695 A JP 2004256695A JP 2003049566 A JP2003049566 A JP 2003049566A JP 2003049566 A JP2003049566 A JP 2003049566A JP 2004256695 A JP2004256695 A JP 2004256695A
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adhesive layer
adhesive
weight
sheet
adhesive sheet
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JP4529357B2 (en
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Teiichi Inada
禎一 稲田
Hiroyuki Kawakami
広幸 川上
Michio Uruno
道生 宇留野
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Resonac Corp
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Hitachi Chemical Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • 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
    • H01L24/26Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
    • H01L24/27Manufacturing methods
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/683Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
    • H01L21/6835Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
    • H01L21/6836Wafer tapes, e.g. grinding or dicing support tapes
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    • H01L24/26Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
    • H01L24/28Structure, shape, material or disposition of the layer connectors prior to the connecting process
    • H01L24/29Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
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    • H01L24/80Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L24/83Methods 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 layer connector
    • HELECTRICITY
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    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
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    • H01L2224/26Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
    • H01L2224/28Structure, shape, material or disposition of the layer connectors prior to the connecting process
    • H01L2224/29Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
    • H01L2224/29001Core members of the layer connector
    • H01L2224/29099Material
    • H01L2224/2919Material with a principal constituent of the material being a polymer, e.g. polyester, phenolic based polymer, epoxy
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    • H01L2224/83Methods 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 layer connector
    • H01L2224/8319Arrangement of the layer connectors prior to mounting
    • H01L2224/83191Arrangement of the layer connectors prior to mounting wherein the layer connectors are disposed only on the semiconductor or solid-state body
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    • H01L2224/83Methods 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 layer connector
    • H01L2224/838Bonding techniques
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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Dicing (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive sheet which acts as a dicing tape in a dicing process and acts as a sheet adhesive excellent in splicing reliability in a process for joining a semiconductor element and a support member, and to provide a semiconductor device using the adhesive sheet and a method for producing the same. <P>SOLUTION: The adhesive sheet is prepared by laminating at least an adhesive layer and a base material sheet with a self-adhesive property. The above-described problem was solved by controlling the tack strength between the adhesive layer and the base material sheet and the content of a thermosetting resin existing within 1 μm from the surface of the adhesive layer. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、接着シート、ならびにこれを用いた半導体装置およびその製造方法に関する。
【0002】
【従来の技術】
従来、半導体素子と半導体素子搭載用支持部材の接合には銀ペーストが主に使用されていた。しかし、近年の半導体素子の小型化・高性能化に伴い、使用される支持部材にも小型化・細密化が要求されるようになってきている。こうした要求に対して、銀ペーストでは、はみ出しや半導体素子の傾きに起因するワイヤボンディング時における不具合の発生、接着剤層の膜厚の制御困難性、および接着剤層のボイド発生などにより前記要求に対処しきれなくなってきている。そのため、前記要求に対処するべく、近年、シート状の接着剤が使用されるようになってきた。
【0003】
この接着剤シートは、個片貼付け方式あるいはウエハ裏面貼付け方式において使用されている。前者の個片貼付け方式の接着剤シートを用いて半導体装置を製造する場合、リール状の接着剤シートをカッティングあるいはパンチングによって個片に切り出した後、その個片を半導体素子支持部材に接着し、そこへダイシング工程によって個片化された半導体素子を接合して半導体素子付き支持部材を作製し、その後必要に応じてワイヤボンド工程、封止工程などを経ることによって半導体装置が得られることとなる。しかし、前記個片貼付け方式の接着剤シートを用いるためには、これを切り出して支持部材に接着する専用の組立装置が必要であることから、銀ペーストを使用する方法に比べて製造コストが高くなるという問題があった。
【0004】
一方、後者のウエハ裏面貼付け方式の接着剤シートを用いて半導体装置を製造する場合、まず半導体ウエハの裏面に接着剤シートを貼付け、さらに接着剤シートの他面にダイシングテープを貼り合わせ、その後前記ウェハからダイシングによって半導体素子を個片化し、個片化した接着剤シート付き半導体素子をピックアップし、それを支持部材に接合し、その後の加熱、硬化、ワイヤボンドなどの工程を経ることにより半導体装置が得られることとなる。このウエハ裏面貼付け方式の接着剤シートによれば、接着剤シートを個片化する装置を必要とせず、従来の銀ペースト用の組立装置をそのままあるいは熱盤を付加するなどの装置の一部を改良することにより使用できる。そのため、接着剤シートを用いた組立方法の中で製造コストが比較的安く抑えられる方法として注目されている。
【0005】
しかしながら、上記ウエハ裏面貼付け方式の接着剤シートを用いる方法にあっては、前記ダイシング工程までに接着剤シートを貼付する工程、ダイシングテープを貼付する工程の2つの貼付工程が必要であったことから、作業工程の簡略化が求められていた。そこで、接着剤シートをあらかじめダイシングテープ上に付設しておき、これをウエハに貼り付ける方法が提案されている。(例えば、特許文献1〜3参照。)。
【0006】
【特許文献1】
特開2002−226796号公報
【特許文献2】
特開2002−158276号公報
【特許文献3】
特開平2−32181号公報
【0007】
【発明が解決しようとする課題】
しかしながら、接着剤シートがあらかじめダイシングテープ上に付設された接着シートは、ダイシングテープの粘着剤層と接着剤シートが接している状態で保管されるため、時間と共にこれら界面のピール強度が変化することがあり、安定した界面剥離強度を設定することが困難であり、そのため、チップのピックアップ工程での不良が増大することがわかった。
【0008】
このようにピール強度が時間経過とともに変化することは、ダイシングテープの粘着剤層に接着剤シートが付設された接着シートで初めてみられた課題であり、この原因としては、ダイシングテープの粘着剤層、および接着剤シートに含まれる低分子量樹脂成分の界面付近での拡散、それぞれの層の混和が考えられる。
【0009】
上記を鑑みて、本発明は、ダイシング工程ではダイシングテープとして作用し、半導体素子と支持部材との接合工程では接続信頼性に優れる接着剤シートとして使用でき、さらには、長期保管した後に使用しても、安定した基材シートと接着剤層の界面剥離強度が得られる接着シートを提供することを目的とする。
【0010】
また、本発明は、半導体素子搭載用支持部材に熱膨張係数の差が大きい半導体素子を実装する場合に要求される耐熱性を有し、かつ作業性に優れる接着シートを提供することを目的とする。
【0011】
さらに、本発明は、上記接着シートを用いた半導体装置および製造工程を簡略化できる半導体装置の製造方法を提供することを目的とする。
【0012】
【課題を解決するための手段】
本発明は、少なくとも接着剤層と粘着性を有する基材シートとが積層された接着シートであって、接着剤層と基材シートのタック強度、および接着剤層表面近傍に存在する低分子量樹脂成分の含有量を調節することによって、上記課題を解決した。
【0013】
すなわち、本発明は、下記(1)〜(10)に記載の事項に関する。
【0014】
(1)高分子量樹脂成分と重量平均分子量3000以下の低分子量樹脂成分とを主成分とする接着剤層、および粘着性を有する基材シートが少なくとも積層された接着シートであって、
1)接着剤層は、表面近傍1μmに存在する低分子量樹脂成分の含有比率aが40重量%未満であり、25℃における5.1mmΦプローブ測定によるタック強度Aが0.001〜0.3Nであり、60℃における5.1mmΦプローブ測定によるタック強度Bが0.5N以上であり、かつ(タック強度B/タック強度A)>4を満たし、
2)少なくとも基材シートの接着剤層と接する層の、放射線照射前の25℃における5.1mmΦプローブ測定によるタック強度αが0.05〜5Nであり、放射線照射後の25℃における5.1mmΦプローブ測定によるタック強度βが0〜4.95Nであることを特徴とする接着シート。
【0015】
(2)基材シートが、基材層および該基材層の少なくとも片面に積層された粘着剤層を有するものであることを特徴とする上記(1)記載の接着シート。
【0016】
(3)粘着剤層はアクリルモノマ、アクリルオリゴマあるいはその重合体を主成分としたものであることを特徴とする上記(2)記載の接着シート。
【0017】
(4)接着剤層、粘着剤層および基材層が、基材層/粘着剤層/接着剤層の順で積層されていることを特徴とする上記(2)または(3)記載の接着シート。
【0018】
(5)接着剤層の表面近傍1μmの低分子量樹脂成分の含有比率aと中心部の低分子量樹脂成分の含有比率bが、b>a×1.2を満たすことを特徴とする上記(1)〜(4)のいずれかに記載の接着シート。
【0019】
(6)高分子量樹脂成分の重量平均分子量が5万以上であり、かつそのTg(ガラス転移温度)が−50℃以上70℃以下であることを特徴とする上記(1)〜(5)のいずれかに記載の接着シート。
【0020】
(7)接着剤層が、低分子量樹脂成分としてエポキシ樹脂とその硬化剤100重量部、高分子量樹脂成分としてグリシジル(メタ)アクリレート0.5〜10重量部を含み、重量平均分子量が5万以上であり、かつTg(ガラス転移温度)が−50℃以上70℃以下であるエポキシ基含有アクリル系共重合体50〜900重量部を含むことを特徴とする上記(1)〜(6)のいずれかに記載の接着シート。
【0021】
(8)上記(1)〜(7)のいずれかに記載の接着シートを用いて、半導体素子と半導体素子搭載用支持部材とを接着したことを特徴とする半導体装置。
【0022】
(9)上記(1)〜(7)のいずれかに記載の接着シートの接着剤層面に半導体ウエハを貼り付ける工程、半導体ウエハを接着シートとともに固定し、これを所定の大きさにダイシングし、半導体素子を形成する工程、接着剤層と基材シートの界面で剥離し、接着剤層付き半導体素子を得る工程、および接着剤層付き半導体素子と半導体素子搭載用支持部材とを接着剤層を介して所定位置に接着する工程、を含む半導体装置の製造方法。
【0023】
(10)ダイシング後、接着剤層と基材シートの界面で剥離する前に、基材シート側から放射線を照射する工程を有することを特徴とする上記(9)記載の半導体装置の製造方法。
【0024】
上記のように、本発明の接着シートによれば、ダイシング工程では、半導体素子が飛散しない程度に十分な粘着力を有し、半導体素子ピックアップ時には各素子を傷つけることがない、低い粘着力を有する、という相反する要求を満足するダイシングテープとして作用し、ダイボンド工程では、半導体素子と支持部材との接続信頼性を優れたものとする接着剤シートとして作用することが可能であり、したがって、ダイシングおよびダイボンドの各工程を一枚の接着シートで完了することができ、半導体装置の製造工程を簡略化することができる。
【0025】
さらに、本発明の接着シートによれば、接着剤層の表面近傍に存在する低分子量樹脂成分の含有比率aが低減され、かつ基材シートおよび接着剤層のタック強度が調整されているため、基材シートと接着剤層界面の剥離強度の経時増加が低減され、可使期間を大幅に延ばすことができる。
【0026】
なお、本発明において、「タック強度」とは、粘接着剤層の粘接着性の指標となるものであって、例えば、RHESCA社製タッキング試験機を用いて、JISZ0237−1991に記載の方法により引き剥がし速度10mm/s、接触荷重100gf/cm、接触時間1sの条件で測定することにより得られる値である。
【0027】
また、本発明において、「重量平均分子量」とは、後に評価方法の欄で説明するようにゲルパーミュエーションクロマトグラフィーで測定し、標準ポリスチレン検量線を用いて換算した値を示す。
【0028】
以下、本発明を詳細に説明する。
【0029】
【発明の実施の形態】
本発明の接着シートは、高分子量樹脂成分と重量平均分子量3000以下の低分子量樹脂成分を主成分として含む接着剤層と、粘着性を有する基材シートが少なくとも積層された接着シートである。
【0030】
上記接着剤層中の高分子量樹脂成分としては、例えば、ポリイミド、(メタ)アクリル樹脂、ウレタン樹脂、ポリエーテルイミド樹脂、フェノキシ樹脂、変性ポリフェニレンエーテル樹脂等が挙げられるが、特に限定されない。好ましくは、重量平均分子量が5万以上であり、かつTg(ガラス転移点)が−50℃以上70℃以下であるものを用いる。Tgが−50℃より低いと、室温のタック強度が大きすぎ、基材フィルムとの剥離が困難になる。また、Tgが70℃を越えると、60℃のタック強度が低く、ウエハへの貼付が困難になる。
【0031】
上記接着剤層中の重量平均分子量3000以下の低分子量樹脂成分としては、加熱により、熱硬化性を有するものが、耐熱性が高い点で好ましい。このような樹脂としては、例えば、エポキシ樹脂、シアネート樹脂、フェノール樹脂等があるが、耐熱性が高い点で、エポキシ樹脂が好ましい。エポキシ樹脂は、硬化して接着作用を有するものであれば、特に限定されず、例えば、ビスフェノールA型エポキシなどの二官能エポキシ樹脂、フェノールノボラック型エポキシ樹脂やクレゾールノボラック型エポキシ樹脂などのノボラック型エポキシ樹脂などを使用することができる。また、多官能エポキシ樹脂、グリシジルアミン型エポキシ樹脂、複素環含有エポキシ樹脂または脂環式エポキシ樹脂など、一般に知られているものを適用することができる。これらの樹脂は、単独でまたは2種類以上を組み合わせて使用することができる。
【0032】
さらに、エポキシ樹脂を用いる場合の硬化剤としては、通常用いられている公知の硬化剤を使用することができる。例えば、アミン類、ポリアミド、酸無水物、ポリスルフィド、三フッ化ホウ素、ビスフェノールA、ビスフェノールF,ビスフェノールSのようなフェノール性水酸基を1分子中に2個以上有するビスフェノール類、フェノールノボラック樹脂、ビスフェノールAノボラック樹脂またはクレゾールノボラック樹脂などのフェノール樹脂などが挙げられる。特に吸湿時の耐電食性に優れる点で、フェノールノボラック樹脂、ビスフェノールAノボラック樹脂またはクレゾールノボラック樹脂などのフェノール樹脂が好ましい。
【0033】
また、本発明の接着剤層においては、その表面近傍1μmに存在する重量平均分子量3000以下の低分子量樹脂成分の含有比率aが40重量%未満であることが必要である。表面近傍1μmに存在する重量平均分子量3000以下の低分子量樹脂成分の含有比率aを40重量%未満とすることで、基材シートと接着剤層界面の剥離強度(ピール強度)の経時的な上昇を抑制することができ、接着シートの可使期間の延長に寄与することとなる。
【0034】
さらに、接着剤層中心部における重量平均分子量3000以下の低分子量樹脂成分の含有比率bが接着剤層表面近傍1μmにおける重量平均分子量3000以下の低分子量樹脂成分の含有比率aに対して大きいことが好ましく、b>a×1.2を満たすことがより好ましい。これによれば、接着剤層の耐熱性をより向上させることが可能となる。このような条件を満たす樹脂組成物として、表面に選択的に析出する高分子量樹脂と重量平均分子量3000以下の低分子量樹脂の混合物が挙げられる。なお、接着剤層の表面近傍1μmにおける重量平均分子量3000以下の低分子量樹脂成分の含有比率aは、接着剤層表面、裏面を深さ1μmになるように切削試験機(ダイプラウィンテス製、サイカス)で切削した後、得られた試料のテトラヒドロフラン溶液をゲルパーミエーションクロマトグラフィーを用いて測定する。標準ポリスチレン検量線を用いて換算した重量平均分子量3000以下の低分子量樹脂成分について、ピークの同定、テトラヒドロフラン溶液中の濃度とピーク高さの相関関係を得ることにより、その比率を算出することができる。また、「接着剤層中心部」とは、(接着剤層の膜厚)/2±2μmの範囲を指し、当該中心部における重量平均分子量3000以下の低分子量樹脂成分の含有比率bは、接着剤層中心部を含有比率aと同様の方法で切削し、同様の方法で算出することができる。
【0035】
また、本発明の接着シートの接着剤層は、25℃における5.1mmΦプローブ測定によるタック強度Aが0.001〜0.3Nであり、60℃における5.1mmΦプローブ測定によるタック強度Bが0.5N以上であり、かつ(タック強度B/タック強度A)>4を満たすことが必要である。タック強度Aを0.001〜0.3Nとすることでタック強度の経時的増加を抑制し、タック強度Bを0.5N以上とすることで、ウエハへの貼付を容易なものとした。また、(タック強度B/タック強度A)>4を満たすことで、室温と60℃のタック強度の差が大きくなり、60℃付近の温度で容易にウェハにラミネートすることが可能となる。
【0036】
接着剤層のタック強度を所望の範囲に調節する方法としては、接着剤層の室温における流動性を上昇させること、高分子量樹脂成分のTg(ガラス転移点)を低下させることにより、接着強度及びタック強度も上昇する傾向があり、流動性を低下させる、あるいは高分子量樹脂成分のTgを増大すれば接着強度及びタック強度も低下する傾向があることを利用すればよい。樹脂成分のうち、特に低分子量樹脂成分(タッキファイヤ等)の比率、高分子量樹脂成分のTgを調整することによって所望のタック強度を得ることができる。例えば、流動性を上昇させる場合には、可塑剤の含有量の増加、粘着付与材の含有量の増加等の方法がある。逆に流動性を低下させる場合には、前記化合物の含有量を減らせばよい。前記可塑剤としては、例えば、単官能のアクリルモノマ、単官能エポキシ樹脂、液状エポキシ樹脂、アクリル系樹脂、エポキシ系のいわゆる希釈剤等が挙げられる。
【0037】
また、接着剤層に適当なタック強度を付与し、シート状での取扱い性を良好なものとするために、硬化促進剤、フィラー、カップリング剤、触媒等の添加剤をさらに添加してもよい。さらに、必要に応じて耐熱性や吸水性等の物性を調整、向上させる添加剤を添加してもよい。
【0038】
硬化促進剤としては、特に制限はなく、例えば、イミダゾール類等が挙げられる。具体的には、例えば、2−メチルイミダゾール、2−エチル−4−メチルイミダゾール、1−シアノエチル−2−フェニルイミダゾール、1−シアノエチル−2−フェニルイミダゾリウムトリメリテート等が挙げられ、これらは単独で又は二種類以上を組み合わせて使用することができる。上記硬化促進剤の添加量は樹脂成分100重量部に対して、10重量部以下が好ましく、1重量部以下がより好ましい。添加量が10重量部を超えると保存安定性が低下する傾向がある。
【0039】
また、フィラーとしては、特に制限はなく、例えば、水酸化アルミニウム、水酸化マグネシウム、炭酸カルシウム、炭酸マグネシウム、ケイ酸カルシウム、ケイ酸マグネシウム、酸化カルシウム、酸化マグネシウム、酸化アルミニウム、窒化アルミニウム、ほう酸アルミウイスカ、窒化ほう素、結晶性シリカ、非晶性シリカ等が挙げられ、フィラーの形状は特に制限されるものではない。これらのフィラーは単独で又は二種類以上を組み合わせて使用することができる。中でも、熱伝導性向上のために、酸化アルミニウム、窒化アルミニウム、窒化ほう素、結晶性シリカ、非晶性シリカが好ましい。また、溶融粘度の調整やチキソトロピック性の付与の目的には、水酸化アルミニウム、水酸化マグネシウム、炭酸カルシウム、炭酸マグネシウム、ケイ酸カルシウム、ケイ酸マグネシウム、酸化カルシウム、酸化マグネシウム、酸化アルミニウム、結晶性シリカ、非晶性シリカなどが好ましい。フィラーの使用量は、樹脂成分100重量部に対して、20〜600重量部が好ましい。20重量部未満だと添加効果が得られない傾向があり、600重量部を超えると、接着剤層の貯蔵弾性率の上昇、接着性の低下、ボイド残存による電気特性の低下等の問題を起こす傾向がある。
【0040】
また、カップリング剤としては、例えば、シラン系、チタン系、アルミニウム系等が挙げられ、中でも効果が高い点でシラン系カップリング剤が好ましい。
【0041】
上記カップリング剤の使用量は、その効果や耐熱性及びコストの面から、樹脂成分100重量部に対して、0.1〜10重量部とすることが好ましく、0.1〜3重量部とすることがより好ましい。
【0042】
また、本発明の接着シートの接着剤層は、上記のような高分子量樹脂成分および低分子量樹脂成分を主成分とするが、それぞれの含有量としては、高分子量樹脂成分が20〜80重量部、低分子量樹脂成分が20〜80重量部であることが好ましい。
【0043】
また、本発明の接着シートの接着剤層は、好ましくは、低分子量樹脂成分としてエポキシ樹脂とその硬化剤100重量部、および高分子量樹脂成分としてグリシジル(メタ)アクリレート0.5〜10重量部を含み、重量平均分子量が5万以上であり、かつTg(ガラス転移温度)が−50℃以上70℃以下であるエポキシ基含有アクリル系共重合体50〜900重量部を含む樹脂組成物により形成される。
【0044】
本発明の接着シートに用いる基材シートは、粘着性を有することが必要であり、さらに、放射線照射前の25℃における5.1mmΦプローブ測定によるタック強度αが0.05〜5Nであり、放射線照射後の25℃における5.1mmΦプローブ測定によるタック強度βが0〜4.95Nの条件を満たすことが必要である。
【0045】
粘着性を有する基材シートとしては、例えば、基材シート自身が粘着性を有するものや粘着性を持たない基材層の片面に粘着剤層を積層してなるもの等が含まれるが、取り扱い性等の観点からは後者を用いることが好ましい。その場合、基材層/粘着剤層/接着剤層の順で積層されていることが好ましい。さらに、放射線照射前後の基材シートのタック強度αおよびβの条件は、粘着剤層がこれを満たせばよい。したがって、基材シートまたは基材シートの粘着剤層には、放射線重合性化合物や光重合開始剤等の、放射線により硬化反応が進行する、もしくは硬化反応を促進させる化合物が含まれている必要がある。このような化合物としては、紫外線や電子ビームなどの放射線が照射されると重合・硬化する公知の化合物であればよく、特に限定されない。
【0046】
上記基材層としては、例えば、ポリテトラフルオロエチレンフィルム、ポリエチレンテレフタレートフィルム、ポリエチレンフィルム、ポリプロピレンフィルム、ポリメチルペンテンフィルム、ポリイミドフィルムなどのプラスチックフィルム等が挙げられる。また、プライマー塗布、UV処理、コロナ放電処理、研磨処理、エッチング処理等の表面処理が行われていても良い。
【0047】
上記のような基材層となるプラスチックフィルムの片面に、適度なタック強度を有する樹脂組成物(粘着剤)を塗布乾燥することで粘着性を有する基材シートを得ることができる。粘着剤層に用いる樹脂としては、特に限定されないが、アクリルモノマ、アクリルオリゴマあるいはその重合体を主成分としたものであることが好ましい。また、接着剤層を形成する前述の各種成分が含まれていてもよい。
【0048】
本発明の接着シートの接着剤層および基材シートの厚みは、特に制限はないが、接着剤層、基材シートともに5〜250μmが好ましい。5μmより薄いと応力緩和効果が乏しくなる傾向があり、250μmより厚いと経済的でなくなる上に、半導体装置の小型化の要求に応えられない。また、基材シートに粘着剤層を形成する場合には、その厚みが0.1〜50μmであることが好ましい。0.1μmより小さいとダイシング時の粘着力が十分でなくなる傾向があり、50μmより厚いとダイシング時に半導体素子が傷つき易くなる傾向がある。
【0049】
基材シート上に接着剤層を積層する方法としては、特に限定されないが、予め離型処理などを施したフィルム上に、上記のような接着剤層を形成する樹脂組成物を溶剤に溶解あるいは分散した接着剤樹脂ワニスを塗布、加熱し溶剤を除去し、これを基材シートと積層させることにより行うことが好ましい。
【0050】
上記のワニス化に用いることのできる溶剤としては、特に限定されないが、フィルム作製時の揮発性などを考慮すると、例えば、メタノール、エタノール、2−メトキシエタノール、2−エトキシエタノール、2−ブトキシエタノール、メチルエチルケトン、アセトン、メチルイソブチルケトン、トルエン、キシレンなどの比較的低沸点の溶媒を使用するのが好ましい。また、塗膜性を向上させるなどの目的で、たとえば、ジメチルアセトアミド、ジメチルホルムアミド、N−メチルピロリドン、シクロヘキサノンなどの比較的高沸点の溶媒を使用することもできる。これらの溶媒は、単独でまたは2種類以上を組み合わせて使用することができる。
【0051】
また、フィラーを添加した接着剤層となる樹脂組成物をワニス化する場合、フィラーの分散性を考慮して、らいかい機、3本ロール、ボールミル及びビーズミルなどを使用するのが好ましく、また、これらを組み合わせて使用することもできる。また、フィラーと低分子量樹脂成分の原料をあらかじめ混合した後、高分子量樹脂成分の原料を配合することによって、混合する時間を短縮することもできる。また、ワニスとした後、真空脱気等によってワニス中の気泡を除去することもできる。
【0052】
上記フィルムへの接着剤樹脂ワニスの塗布方法としては、公知の方法を用いることができ、例えば、ナイフコート法、ロールコート法、スプレーコート法、グラビアコート法、バーコート法、カーテンコート法、プレス法、ホットロールラミネート法等が挙げられるが、連続的に製造でき、効率が良い点でホットロールラミネート方法が好ましい。
【0053】
次に、本発明の接着シートの使用方法を図面を用いてより詳細に説明するが本発明はこれらに限定されるものではない。図1〜図8を参照しながら説明するが、図中同一の機能を有するものについては同一の符号を付してその説明を省略する。
【0054】
図1には基材層1aと粘着剤層1bからなる基材シート1、および接着剤層2とを備える接着シート10が開示されており、図2には前記構成要件に加えてさらに剥離性シート3を備える接着シート11が開示されている。
【0055】
接着シート10をダイシングテープとして使用する場合、まず接着シート10の接着剤層2を上向きにして所定の作業台上に載置する。接着シート11を用いる場合には、剥離性シート3を剥離除去した後に、接着シートの接着剤層2を上向きにして所定の作業台上に載置する。
【0056】
次に、接着剤層2の上面にダイシング加工すべき半導体ウエハAを貼着する(図3参照)。この際のラミネート温度は通常20℃〜200℃の間で行われるが、ウエハのそりが少ない点で、20℃〜130℃が好ましく、基材シートの伸びが小さい点で、20℃〜80℃がさらに好ましい。
【0057】
続いて、ダイシングカッター6を用いて半導体ウエハAをダイシングし、これを洗浄、乾燥することで、半導体素子A1、A2、A3を得る(図4参照)。この間、接着シートの接着剤層2により半導体ウエハAは十分に保持されているので、半導体ウエハAや切り出された半導体素子が脱落することはない。
【0058】
次に、図6および図7に示されるようにしてピックアップすべき半導体素子A1、A2、A3を例えば吸引コレット4によりピックアップする。この際、吸引コレット4に換えて又は吸引コレット4と併用するようにして、ピックアップすべき半導体素子A1、A2、A3を基材シート1の下面から、例えば針扞等により突き上げることもできる。半導体素子A1と接着剤層2との間の接着強度は、接着剤層2と基材シートの粘着剤層1bとの間の粘着力よりも大きいため、半導体素子A1のピックアップを行うと、その下面に接着剤層2が付着した接着剤層付き半導体素子A1を得ることができる。
【0059】
また、図4に示すダイシング後、半導体素子をピックアップする前に、図5に示すように、放射線Bを接着シートの粘着剤層1bに照射し、放射線重合性を有する粘着剤層1bの一部又は大部分を重合硬化せしめることもできる。この際、放射線照射と同時あるいは放射線照射後に硬化反応を促進する目的で加熱を併用しても良い。粘着剤層1bに放射線を照射することで、粘着剤層1bと接着剤層2界面の接着強度を低減することができ、その結果、容易にかつ確実に半導体素子のピックアップを行うことが可能となる。なお、接着シートへの放射線照射は、基材層1aの粘着剤層1bが設けられていない面から行うことが好ましく、その場合、放射線として紫外線を用いる場合には基材層1aは光透過性である必要があるが、放射線として電子線を用いる場合には基材層1aは必ずしも光透過性である必要はない。
【0060】
次いで、ピックアップした接着剤層付き半導体素子A1、A2、A3を、接着剤層2を介して半導体素子搭載用支持部材5に載置し、接着させる(図8参照)。この際に加熱することで接着剤層2はより大きな接着強度を発現し、半導体素子A1、A2、A3と半導体素子搭載用支持部材5との接着を確かなものとすることができる。
【0061】
【実施例】
低分子量樹脂成分としてYD8125(東都化成(株)製商品名、ビスフェノールA型エポキシ樹脂、エポキシ当量175)15重量部、その硬化剤としてYDCN703(東都化成(株)商品名、クレゾールノボラック型エポキシ樹脂、エポキシ当量210)45重量部、吸水率を低減し耐熱性を付与するミレックスXLC−2L(三井化学(株)製商品名、ザイロック樹脂、水酸基当量169)50重量部、高分子量樹脂成分としてHTR−860P−3(帝国化学産業(株)商品名、エポキシ基含有アクリルゴム、重量平均分子量:80万、示差走査熱量計(DSC)により、昇温速度10℃/分の条件で測定したTg:−7℃)250重量部、硬化促進剤としてキュアゾール2PZ−CN(四国化成工業(株)製商品名、1−シアノエチル−2−フェニルイミダゾール)0.5重量部、カップリング剤としてNUC A−187(日本ユニカー(株)商品名、γ−グリシドキシプロピルトリメトキシシラン)0.7重量部からなる樹脂組成物にシクロヘキサノンを加えて攪拌混合し、真空脱気した接着剤樹脂ワニスを、厚さ50μmの離型処理したポリエチレンテレフタレートフィルム上に塗布し、140℃で5分間加熱乾燥して、膜厚が25μmのBステージ状態の剥離フィルム付き接着剤層を得た。これをホットロールラミネータ(Du Pont製Riston)により基材シートであるダイシング用UVテープ(古河電工(株)製 UC−353EP−110、タック強度α=1N、タック強度β=0.2N)にラミネートして接着シートを得た。
【0062】
次いで、この接着シートを1日、30日、90日間放置した後のそれぞれの特性について、以下のような方法により評価を行った。
【0063】
得られた接着シートの接着剤層に厚さ150μmの半導体ウェハを貼付け、これをダイシング装置上に載置、固定し、100mm/secの速度で5mm×5mmに半導体ウエハをダイシングした。ここで、ダイシング時にチップ(半導体素子)が飛んだ確率(%/100チップ)でダイシング時のチップ飛びを評価した。結果を表1に示す。
【0064】
その後、ピックアップ装置にて接着剤層付き半導体素子をピックアップし、これを半導体素子搭載用支持部材である厚み25μmのポリイミドフィルム上に貼り合せ、半導体装置サンプル(片面にはんだボールを形成)とした。このサンプルについてその耐熱性を調べた。耐熱性の評価は、耐リフロークラック性と耐温度サイクル性試験により評価した。耐リフロークラック性試験は、サンプル表面の最高温度が240℃でこの温度を20秒間保持するように温度設定したIRリフロー炉にサンプルを通し、室温で放置することにより冷却する処理を2回繰り返したサンプル中のクラックを目視と超音波顕微鏡で視察した。試料10個すべてでクラックの発生していないものを○とし、1個以上発生していたものを×とした。また、耐温度サイクル性の試験は、サンプルを−55℃雰囲気に30分間放置し、その後125℃の雰囲気に30分間放置する工程を1サイクルとして、1000サイクル後において超音波顕微鏡を用いて剥離やクラック等の破壊を判断した。試料10個すべてでこれら不具合が発生していないものを○、1個以上発生したものを×とした。結果を表1に示す。
【0065】
一方、上記ダイシング後に、上記半導体装置サンプルの作製とは別に、(株)オーク製作所製UV−330 HQP−2型露光機を使用して、500mJ/cmの露光量で上記接着シートの基材シートを露光し、ピックアップ装置にて接着剤層付き半導体素子をピックアップした。ここで、ピックアップダイボンダ−により接着剤層付き半導体素子をピックアップしたときの成功率(%/100チップ)で接着剤層付き半導体素子のピックアップ性を評価した。結果を表1に示す。
【0066】
【表1】

Figure 2004256695
【0067】
表1から、本発明の接着シートは耐熱性に優れ、ダイシング時のチップ飛びも無く、ピックアップ性も良好であることが分かる。
【0068】
【発明の効果】
本発明によれば、ダイシング工程ではダイシングテープとして作用し、半導体素子と支持部材との接合工程では接続信頼性に優れる接着剤シートとして使用できる接着シートを提供することができ、さらには、長期保管した後にこれを使用しても、基材シートと接着剤層の界面剥離強度が安定した接着シートを提供することができる。つまり、その可使期間が従来と比較して大幅に延長された接着シートを提供することができる。
【0069】
また、本発明の接着シートは、半導体素子搭載用支持部材に熱膨張係数の差が大きい半導体素子を実装する場合に要求される耐熱性を有し、かつ作業性に優れる接着シートである。
【0070】
さらに、本発明の接着シートを用いて、半導体装置を製造することでその工程を簡略化することができる。
【図面の簡単な説明】
【図1】本発明に係る接着シートの一例の断面図である。
【図2】本発明に係る接着シートの別の例の断面図である。
【図3】本発明に係る接着シートに半導体ウエハを貼着した状態を示す図である。
【図4】本発明に係る接着シートを半導体ウエハのダイシング工程に用いた図である。
【図5】本発明に係る接着シートに基材層側から放射線を照射した状態を示す図である。
【図6】本発明に係る接着シートから半導体素子をピックアップする工程を示す図である。
【図7】ピックアップされた接着剤層付き半導体素子を示す図である。
【図8】半導体素子を半導体素子搭載用支持部材に熱圧着した状態を示す図である。
【符号の説明】
1 基材シート
1a 基材シート中の基材層
1b 基材シート中の粘着剤層
2 接着剤層
3 離性シート
4 吸引コレット
5 半導体素子搭載用支持部材
6 ダイシングカッター
10、11 接着シート
A 半導体ウエハ
A1、A2、A3…半導体素子
B 放射線[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an adhesive sheet, a semiconductor device using the same, and a method for manufacturing the same.
[0002]
[Prior art]
Conventionally, silver paste has been mainly used for joining a semiconductor element and a semiconductor element mounting support member. However, with the recent miniaturization and high performance of semiconductor elements, the supporting members used have also been required to be miniaturized and miniaturized. In response to such demands, silver paste satisfies the above-mentioned requirements due to the occurrence of defects during wire bonding due to protrusion or inclination of the semiconductor element, difficulty in controlling the thickness of the adhesive layer, and generation of voids in the adhesive layer. It is becoming impossible to cope. Therefore, in order to cope with the above demand, a sheet-like adhesive has recently been used.
[0003]
This adhesive sheet is used in an individual piece bonding method or a wafer backside bonding method. In the case of manufacturing a semiconductor device using the former individual piece adhesive system adhesive sheet, after cutting the reel-shaped adhesive sheet into individual pieces by cutting or punching, the individual pieces are bonded to a semiconductor element supporting member, The semiconductor element singulated by the dicing step is bonded thereto to produce a supporting member with a semiconductor element, and then, if necessary, a wire bonding step, a sealing step, and the like are performed to obtain a semiconductor device. . However, in order to use the adhesive sheet of the individual piece sticking method, since a dedicated assembling apparatus for cutting out and bonding the adhesive sheet to the support member is required, the manufacturing cost is higher than the method using a silver paste. There was a problem of becoming.
[0004]
On the other hand, in the case of manufacturing a semiconductor device using the latter adhesive sheet of the wafer backside bonding method, first, an adhesive sheet is attached to the backside of the semiconductor wafer, and further a dicing tape is attached to the other surface of the adhesive sheet, and then A semiconductor device is diced from a wafer by dicing, a semiconductor element with an adhesive sheet that has been diced is picked up, joined to a supporting member, and then subjected to steps such as heating, curing, and wire bonding. Is obtained. According to the adhesive sheet of the wafer backside bonding method, there is no need for a device for separating the adhesive sheet into pieces, and a part of the device such as a conventional silver paste assembling device or a hot plate is added. It can be used by improvement. For this reason, attention has been paid to a method of suppressing the manufacturing cost relatively low among the assembling methods using the adhesive sheet.
[0005]
However, in the method using an adhesive sheet of the above-mentioned wafer backside adhering method, two adhering steps of a step of adhering an adhesive sheet and a step of adhering a dicing tape before the dicing step were necessary. Therefore, simplification of the work process has been required. Therefore, a method has been proposed in which an adhesive sheet is provided in advance on a dicing tape, and the adhesive sheet is attached to a wafer. (For example, refer to Patent Documents 1 to 3.)
[0006]
[Patent Document 1]
JP 2002-226796 A
[Patent Document 2]
JP 2002-158276 A
[Patent Document 3]
JP-A-2-32181
[0007]
[Problems to be solved by the invention]
However, the adhesive sheet in which the adhesive sheet is attached on the dicing tape in advance is stored in a state where the adhesive layer of the dicing tape and the adhesive sheet are in contact with each other, so that the peel strength of these interfaces changes with time. It has been found that it is difficult to set a stable interfacial peel strength, and therefore, the number of defects in the chip pickup process increases.
[0008]
This change in peel strength over time is a problem first seen with an adhesive sheet in which an adhesive sheet is attached to the adhesive layer of a dicing tape. And the diffusion of the low molecular weight resin component contained in the adhesive sheet near the interface, and the mixing of the respective layers.
[0009]
In view of the above, the present invention acts as a dicing tape in the dicing step, and can be used as an adhesive sheet having excellent connection reliability in the joining step between the semiconductor element and the support member, and further used after long-term storage. Another object of the present invention is to provide an adhesive sheet capable of obtaining a stable interfacial peel strength between a substrate sheet and an adhesive layer.
[0010]
Another object of the present invention is to provide an adhesive sheet having heat resistance required when a semiconductor element having a large difference in thermal expansion coefficient is mounted on a semiconductor element mounting support member and having excellent workability. I do.
[0011]
Still another object of the present invention is to provide a semiconductor device using the above-mentioned adhesive sheet and a method for manufacturing a semiconductor device capable of simplifying a manufacturing process.
[0012]
[Means for Solving the Problems]
The present invention provides an adhesive sheet in which at least an adhesive layer and a substrate sheet having tackiness are laminated, the tack strength of the adhesive layer and the substrate sheet, and the low molecular weight resin present near the surface of the adhesive layer. The above problem was solved by adjusting the content of the components.
[0013]
That is, the present invention relates to matters described in the following (1) to (10).
[0014]
(1) An adhesive sheet comprising a high-molecular weight resin component and a low-molecular weight resin component having a weight average molecular weight of 3000 or less as main components, and an adhesive sheet in which at least a base sheet having tackiness is laminated,
1) The adhesive layer has a low molecular weight resin component content a of less than 40% by weight in the vicinity of 1 μm in the vicinity of the surface and a tack strength A of 0.001 to 0.3 N measured by a 5.1 mmφ probe at 25 ° C. Yes, tack strength B measured by a 5.1 mmΦ probe at 60 ° C. is 0.5 N or more, and (tack strength B / tack strength A)> 4 is satisfied;
2) At least the layer in contact with the adhesive layer of the base material sheet has a tack strength α of 0.05 to 5 N at 25 ° C. before irradiation with a probe measured at 25 ° C., and 5.1 mm φ at 25 ° C. after irradiation with radiation. An adhesive sheet having a tack strength β of 0 to 4.95 N as measured by a probe.
[0015]
(2) The adhesive sheet according to the above (1), wherein the substrate sheet has a substrate layer and an adhesive layer laminated on at least one surface of the substrate layer.
[0016]
(3) The adhesive sheet according to (2), wherein the pressure-sensitive adhesive layer is mainly composed of an acrylic monomer, an acrylic oligomer, or a polymer thereof.
[0017]
(4) The adhesive according to the above (2) or (3), wherein the adhesive layer, the pressure-sensitive adhesive layer, and the base material layer are laminated in the order of base material layer / pressure-sensitive adhesive layer / adhesive layer. Sheet.
[0018]
(5) The above-mentioned (1), wherein the content ratio a of the low-molecular-weight resin component at 1 μm near the surface of the adhesive layer and the content ratio b of the low-molecular-weight resin component at the center satisfy b> a × 1.2. The adhesive sheet according to any one of (1) to (4).
[0019]
(6) The above (1) to (5), wherein the high molecular weight resin component has a weight average molecular weight of 50,000 or more and a Tg (glass transition temperature) of -50 ° C to 70 ° C. The adhesive sheet according to any one of the above.
[0020]
(7) The adhesive layer contains 100 parts by weight of an epoxy resin and a curing agent thereof as a low molecular weight resin component, and 0.5 to 10 parts by weight of glycidyl (meth) acrylate as a high molecular weight resin component, and has a weight average molecular weight of 50,000 or more. Any of the above (1) to (6), which contains 50 to 900 parts by weight of an epoxy group-containing acrylic copolymer having a Tg (glass transition temperature) of −50 ° C. or more and 70 ° C. or less. An adhesive sheet according to any one of the above.
[0021]
(8) A semiconductor device, wherein a semiconductor element and a semiconductor element mounting support member are adhered using the adhesive sheet according to any one of (1) to (7).
[0022]
(9) A step of attaching a semiconductor wafer to the adhesive layer surface of the adhesive sheet according to any one of the above (1) to (7), fixing the semiconductor wafer together with the adhesive sheet, and dicing this into a predetermined size; A step of forming a semiconductor element, a step of peeling off at an interface between the adhesive layer and the base material sheet to obtain a semiconductor element with an adhesive layer, and a step of bonding the semiconductor element with the adhesive layer and the supporting member for mounting the semiconductor element to the adhesive layer. Bonding the semiconductor device to a predetermined position through a semiconductor device.
[0023]
(10) The method for manufacturing a semiconductor device according to the above (9), further comprising a step of irradiating radiation from the substrate sheet side after peeling at an interface between the adhesive layer and the substrate sheet after dicing.
[0024]
As described above, according to the adhesive sheet of the present invention, the dicing step has a sufficient adhesive strength so that the semiconductor elements do not scatter, does not damage each element when picking up the semiconductor element, and has a low adhesive strength. , Which can serve as an adhesive sheet that improves the reliability of connection between the semiconductor element and the support member in the die bonding step. Each die bonding process can be completed with one adhesive sheet, and the manufacturing process of the semiconductor device can be simplified.
[0025]
Furthermore, according to the adhesive sheet of the present invention, the content ratio a of the low molecular weight resin component present near the surface of the adhesive layer is reduced, and the tack strength of the base sheet and the adhesive layer is adjusted, The time-dependent increase in the peel strength at the interface between the base material sheet and the adhesive layer is reduced, and the usable life can be greatly extended.
[0026]
In the present invention, "tack strength" is an index of the adhesive property of the adhesive layer, for example, using a tacking tester manufactured by RHESCA, JISZ0237-1991, described in Peeling speed 10mm / s, contact load 100gf / cm by the method 2 , A contact time of 1 s.
[0027]
Further, in the present invention, the “weight average molecular weight” indicates a value measured by gel permeation chromatography and converted using a standard polystyrene calibration curve as described later in the section of the evaluation method.
[0028]
Hereinafter, the present invention will be described in detail.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
The adhesive sheet of the present invention is an adhesive sheet in which at least an adhesive layer containing a high-molecular-weight resin component and a low-molecular-weight resin component having a weight-average molecular weight of 3000 or less as main components and a tacky base sheet are laminated.
[0030]
Examples of the high molecular weight resin component in the adhesive layer include, but are not particularly limited to, polyimide, (meth) acrylic resin, urethane resin, polyetherimide resin, phenoxy resin, and modified polyphenylene ether resin. Preferably, those having a weight average molecular weight of 50,000 or more and a Tg (glass transition point) of -50 ° C or more and 70 ° C or less are used. If the Tg is lower than -50 ° C, the tack strength at room temperature is too large, and it is difficult to peel off the tack from the substrate film. On the other hand, when Tg exceeds 70 ° C., the tack strength at 60 ° C. is low, and it is difficult to attach the wafer to a wafer.
[0031]
As the low-molecular-weight resin component having a weight-average molecular weight of 3000 or less in the adhesive layer, those having thermosetting properties by heating are preferable in terms of high heat resistance. Examples of such a resin include an epoxy resin, a cyanate resin, and a phenol resin, and an epoxy resin is preferable because of its high heat resistance. The epoxy resin is not particularly limited as long as it has an adhesive action upon curing. For example, a bifunctional epoxy resin such as a bisphenol A epoxy, a novolak epoxy such as a phenol novolak epoxy resin or a cresol novolak epoxy resin. Resin or the like can be used. In addition, generally known resins such as a polyfunctional epoxy resin, a glycidylamine type epoxy resin, a heterocyclic epoxy resin, and an alicyclic epoxy resin can be used. These resins can be used alone or in combination of two or more.
[0032]
Further, as the curing agent when using an epoxy resin, a commonly used known curing agent can be used. For example, amines, polyamides, acid anhydrides, polysulfides, boron trifluoride, bisphenols having two or more phenolic hydroxyl groups in one molecule such as bisphenol A, bisphenol F and bisphenol S, phenol novolak resin, bisphenol A A phenol resin such as a novolak resin or a cresol novolak resin is exemplified. In particular, a phenol resin such as a phenol novolak resin, a bisphenol A novolak resin, or a cresol novolak resin is preferable because of its excellent electric corrosion resistance when absorbing moisture.
[0033]
Further, in the adhesive layer of the present invention, the content ratio a of the low-molecular-weight resin component having a weight-average molecular weight of 3000 or less existing at 1 μm in the vicinity of the surface needs to be less than 40% by weight. By setting the content ratio a of the low-molecular-weight resin component having a weight-average molecular weight of 3000 or less existing in the vicinity of the surface of 1 μm to less than 40% by weight, the peel strength (peel strength) at the interface between the base material sheet and the adhesive layer with time is increased. Can be suppressed, and the useful life of the adhesive sheet can be extended.
[0034]
Furthermore, the content ratio b of the low-molecular-weight resin component having a weight-average molecular weight of 3000 or less at the center of the adhesive layer is larger than the content ratio a of the low-molecular-weight resin component having a weight-average molecular weight of 3000 or less at 1 μm near the surface of the adhesive layer. It is more preferable to satisfy b> a × 1.2. According to this, it is possible to further improve the heat resistance of the adhesive layer. Examples of the resin composition satisfying such conditions include a mixture of a high molecular weight resin selectively deposited on the surface and a low molecular weight resin having a weight average molecular weight of 3000 or less. The content ratio a of the low molecular weight resin component having a weight average molecular weight of 3000 or less at 1 μm in the vicinity of the surface of the adhesive layer is determined by using a cutting tester (manufactured by Daipla Wintes; ), The resulting sample in tetrahydrofuran solution is measured using gel permeation chromatography. For the low molecular weight resin component having a weight average molecular weight of 3000 or less converted using a standard polystyrene calibration curve, the ratio can be calculated by identifying the peak and obtaining the correlation between the concentration in the tetrahydrofuran solution and the peak height. . The “adhesive layer central portion” refers to a range of (thickness of the adhesive layer) / 2 ± 2 μm, and the content ratio b of the low-molecular-weight resin component having a weight-average molecular weight of 3000 or less in the central portion corresponds to the adhesiveness. The central part of the agent layer can be cut by the same method as the content ratio a and can be calculated by the same method.
[0035]
Further, the adhesive layer of the adhesive sheet of the present invention has a tack strength A of 0.001 to 0.3 N measured by a 5.1 mmΦ probe at 25 ° C., and a tack strength B measured by a 5.1 mmΦ probe at 60 ° C. of 0. 0.5N or more and (tack strength B / tack strength A)> 4 must be satisfied. By setting the tack strength A to 0.001 to 0.3N, the increase in the tack strength over time was suppressed, and by setting the tack strength B to 0.5N or more, the sticking to the wafer was facilitated. Further, by satisfying (tack strength B / tack strength A)> 4, the difference between the tack strength at room temperature and the tack strength at 60 ° C. becomes large, and it is possible to easily laminate the wafer at a temperature around 60 ° C.
[0036]
Methods for adjusting the tack strength of the adhesive layer to a desired range include increasing the fluidity of the adhesive layer at room temperature and lowering the Tg (glass transition point) of the high molecular weight resin component to increase the adhesive strength and The fact that the tack strength tends to increase and the fluidity is reduced, or that if the Tg of the high molecular weight resin component increases, the adhesive strength and the tack strength also tend to decrease. A desired tack strength can be obtained by adjusting the ratio of the low molecular weight resin component (such as tackifier) and the Tg of the high molecular weight resin component among the resin components. For example, in order to increase the fluidity, there are methods such as an increase in the content of the plasticizer and an increase in the content of the tackifier. Conversely, when the fluidity is reduced, the content of the compound may be reduced. Examples of the plasticizer include a monofunctional acrylic monomer, a monofunctional epoxy resin, a liquid epoxy resin, an acrylic resin, and an epoxy so-called diluent.
[0037]
Further, in order to impart an appropriate tack strength to the adhesive layer and to improve the handleability in the form of a sheet, additives such as a curing accelerator, a filler, a coupling agent, and a catalyst may be further added. Good. Further, an additive for adjusting and improving physical properties such as heat resistance and water absorption may be added as necessary.
[0038]
The curing accelerator is not particularly limited, and includes, for example, imidazoles. Specifically, for example, 2-methylimidazole, 2-ethyl-4-methylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-phenylimidazolium trimellitate and the like can be mentioned. Or two or more types can be used in combination. The addition amount of the curing accelerator is preferably 10 parts by weight or less, more preferably 1 part by weight or less, based on 100 parts by weight of the resin component. If the amount exceeds 10 parts by weight, storage stability tends to decrease.
[0039]
The filler is not particularly limited. For example, aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium silicate, calcium oxide, magnesium oxide, aluminum oxide, aluminum nitride, aluminum borate whisker , Boron nitride, crystalline silica, amorphous silica, etc., and the shape of the filler is not particularly limited. These fillers can be used alone or in combination of two or more. Among them, aluminum oxide, aluminum nitride, boron nitride, crystalline silica, and amorphous silica are preferable for improving thermal conductivity. In addition, for the purpose of adjusting melt viscosity and imparting thixotropic properties, aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium silicate, calcium oxide, magnesium oxide, aluminum oxide, Silica and amorphous silica are preferred. The amount of the filler used is preferably 20 to 600 parts by weight based on 100 parts by weight of the resin component. If the amount is less than 20 parts by weight, the effect of addition tends not to be obtained. If the amount exceeds 600 parts by weight, problems such as an increase in the storage modulus of the adhesive layer, a decrease in adhesiveness, and a decrease in electrical properties due to voids remain. Tend.
[0040]
Examples of the coupling agent include silane-based, titanium-based, and aluminum-based coupling agents. Among them, a silane-based coupling agent is preferable because of its high effect.
[0041]
The amount of the coupling agent to be used is preferably 0.1 to 10 parts by weight, preferably 0.1 to 3 parts by weight, based on 100 parts by weight of the resin component, from the viewpoint of the effect, heat resistance and cost. Is more preferable.
[0042]
The adhesive layer of the adhesive sheet of the present invention contains the high-molecular-weight resin component and the low-molecular-weight resin component as described above as main components, and the content of each of the high-molecular-weight resin component is 20 to 80 parts by weight. Preferably, the low molecular weight resin component is 20 to 80 parts by weight.
[0043]
Further, the adhesive layer of the adhesive sheet of the present invention preferably contains 100 parts by weight of an epoxy resin and a curing agent thereof as a low molecular weight resin component, and 0.5 to 10 parts by weight of glycidyl (meth) acrylate as a high molecular weight resin component. And a resin composition containing 50 to 900 parts by weight of an epoxy group-containing acrylic copolymer having a weight average molecular weight of 50,000 or more and a Tg (glass transition temperature) of -50 ° C to 70 ° C. You.
[0044]
The base sheet used for the adhesive sheet of the present invention is required to have tackiness, and further has a tack strength α of 0.05 to 5 N measured by a 5.1 mmφ probe at 25 ° C. before irradiation with radiation. It is necessary that the tack strength β measured by a 5.1 mmφ probe measurement at 25 ° C. after irradiation satisfies the condition of 0 to 4.95 N.
[0045]
Examples of the adhesive base sheet include those in which the base sheet itself has adhesive properties and those in which an adhesive layer is laminated on one surface of a non-adhesive base material layer. It is preferable to use the latter from the viewpoint of properties and the like. In that case, it is preferable that the layers are laminated in the order of the substrate layer / the pressure-sensitive adhesive layer / the adhesive layer. Furthermore, the tack strengths α and β of the base sheet before and after the irradiation of radiation may be such that the pressure-sensitive adhesive layer satisfies the conditions. Therefore, the base sheet or the pressure-sensitive adhesive layer of the base sheet needs to contain a compound such as a radiation-polymerizable compound or a photopolymerization initiator, which promotes or accelerates the curing reaction by radiation. is there. Such a compound is not particularly limited, as long as it is a known compound that polymerizes and cures when irradiated with radiation such as ultraviolet rays or an electron beam.
[0046]
Examples of the base layer include plastic films such as a polytetrafluoroethylene film, a polyethylene terephthalate film, a polyethylene film, a polypropylene film, a polymethylpentene film, and a polyimide film. Further, a surface treatment such as a primer coating, a UV treatment, a corona discharge treatment, a polishing treatment, and an etching treatment may be performed.
[0047]
A substrate sheet having adhesiveness can be obtained by applying and drying a resin composition (adhesive) having an appropriate tack strength on one side of a plastic film to be a substrate layer as described above. The resin used for the pressure-sensitive adhesive layer is not particularly limited, but is preferably a resin containing an acrylic monomer, an acrylic oligomer or a polymer thereof as a main component. Further, the above-mentioned various components forming the adhesive layer may be contained.
[0048]
The thicknesses of the adhesive layer and the base sheet of the adhesive sheet of the present invention are not particularly limited, but are preferably 5 to 250 μm for both the adhesive layer and the base sheet. When the thickness is less than 5 μm, the stress relaxation effect tends to be poor. When the pressure-sensitive adhesive layer is formed on the base sheet, the thickness is preferably 0.1 to 50 μm. If it is smaller than 0.1 μm, the adhesive strength at the time of dicing tends to be insufficient, and if it is larger than 50 μm, the semiconductor element tends to be easily damaged at the time of dicing.
[0049]
The method of laminating the adhesive layer on the base sheet is not particularly limited, and the resin composition forming the adhesive layer as described above may be dissolved in a solvent on a film that has been subjected to a release treatment or the like. It is preferable to apply the dispersed adhesive resin varnish, heat it to remove the solvent, and laminate this with a base sheet.
[0050]
The solvent that can be used for the above varnishing is not particularly limited, but in consideration of the volatility at the time of film production, for example, methanol, ethanol, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, It is preferable to use a solvent having a relatively low boiling point, such as methyl ethyl ketone, acetone, methyl isobutyl ketone, toluene and xylene. For the purpose of improving the coating properties, for example, a solvent having a relatively high boiling point, such as dimethylacetamide, dimethylformamide, N-methylpyrrolidone, and cyclohexanone, can be used. These solvents can be used alone or in combination of two or more.
[0051]
In addition, when varnishing the resin composition to be an adhesive layer to which the filler is added, in consideration of the dispersibility of the filler, it is preferable to use a grinder, three rolls, a ball mill, a bead mill, and the like, These can be used in combination. Further, the mixing time can be shortened by mixing the raw material of the high molecular weight resin component after the filler and the raw material of the low molecular weight resin component are previously mixed. After the varnish is formed, bubbles in the varnish can be removed by vacuum degassing or the like.
[0052]
As a method for applying the adhesive resin varnish to the film, known methods can be used, for example, knife coating, roll coating, spray coating, gravure coating, bar coating, curtain coating, pressing And a hot roll laminating method. However, a hot roll laminating method is preferable because it can be manufactured continuously and is efficient.
[0053]
Next, the method of using the adhesive sheet of the present invention will be described in more detail with reference to the drawings, but the present invention is not limited thereto. The description will be made with reference to FIGS. 1 to 8, but those having the same functions in the drawings will be denoted by the same reference numerals and description thereof will be omitted.
[0054]
FIG. 1 discloses an adhesive sheet 10 including a substrate sheet 1 composed of a substrate layer 1a and a pressure-sensitive adhesive layer 1b, and an adhesive layer 2, and FIG. An adhesive sheet 11 including the sheet 3 is disclosed.
[0055]
When the adhesive sheet 10 is used as a dicing tape, first, the adhesive sheet 10 is placed on a predetermined workbench with the adhesive layer 2 of the adhesive sheet 10 facing upward. When the adhesive sheet 11 is used, after the peelable sheet 3 is peeled off, the adhesive sheet 2 is placed on a predetermined work table with the adhesive layer 2 of the adhesive sheet facing upward.
[0056]
Next, a semiconductor wafer A to be diced is attached to the upper surface of the adhesive layer 2 (see FIG. 3). The lamination temperature at this time is usually 20 ° C. to 200 ° C., but is preferably 20 ° C. to 130 ° C. in that the warp of the wafer is small, and 20 ° C. to 80 ° C. in that the elongation of the base sheet is small. Is more preferred.
[0057]
Subsequently, the semiconductor wafer A is diced using the dicing cutter 6, and the semiconductor wafer A is washed and dried to obtain the semiconductor elements A1, A2, and A3 (see FIG. 4). During this time, since the semiconductor wafer A is sufficiently held by the adhesive layer 2 of the adhesive sheet, the semiconductor wafer A and the cut semiconductor elements do not fall off.
[0058]
Next, as shown in FIGS. 6 and 7, the semiconductor elements A1, A2, and A3 to be picked up are picked up by the suction collet 4, for example. At this time, the semiconductor elements A1, A2, and A3 to be picked up can be pushed up from the lower surface of the base sheet 1 by, for example, a needle rod or the like, instead of or in combination with the suction collet 4. The adhesive strength between the semiconductor element A1 and the adhesive layer 2 is larger than the adhesive strength between the adhesive layer 2 and the adhesive layer 1b of the base sheet. The semiconductor element A1 with the adhesive layer having the adhesive layer 2 adhered to the lower surface can be obtained.
[0059]
Further, after dicing as shown in FIG. 4 and before picking up the semiconductor element, as shown in FIG. 5, radiation B is applied to the pressure-sensitive adhesive layer 1b of the adhesive sheet, and a part of the radiation-polymerizable pressure-sensitive adhesive layer 1b. Alternatively, most can be polymerized and cured. At this time, heating may be used in combination with radiation irradiation or for the purpose of accelerating the curing reaction after radiation irradiation. By irradiating the pressure-sensitive adhesive layer 1b with radiation, the adhesive strength at the interface between the pressure-sensitive adhesive layer 1b and the adhesive layer 2 can be reduced, and as a result, the semiconductor element can be easily and reliably picked up. Become. Irradiation of the adhesive sheet with radiation is preferably performed from the surface of the base material layer 1a where the pressure-sensitive adhesive layer 1b is not provided. In this case, when ultraviolet rays are used as the radiation, the base material layer 1a has a light transmitting property. However, when an electron beam is used as the radiation, the base material layer 1a does not necessarily need to be light-transmissive.
[0060]
Next, the picked-up semiconductor elements A1, A2, A3 with an adhesive layer are placed on the semiconductor element mounting support member 5 via the adhesive layer 2 and bonded (see FIG. 8). By heating at this time, the adhesive layer 2 develops higher adhesive strength, and the adhesion between the semiconductor elements A1, A2, A3 and the semiconductor element mounting support member 5 can be ensured.
[0061]
【Example】
15 parts by weight of YD8125 (trade name, manufactured by Toto Kasei Co., Ltd., bisphenol A type epoxy resin, epoxy equivalent: 175) as a low molecular weight resin component, and YDCN703 (trade name of Toto Kasei Co., Ltd., cresol novolac type epoxy resin, as a curing agent) Epoxy equivalent 210) 45 parts by weight, 50 parts by weight of Mirex XLC-2L (trade name, manufactured by Mitsui Chemicals, Inc., Xyloc resin, hydroxyl equivalent 169) for reducing water absorption and imparting heat resistance, HTR- as a high molecular weight resin component 860P-3 (trade name of Teikoku Chemical Industry Co., Ltd., epoxy group-containing acrylic rubber, weight average molecular weight: 800,000, Tg measured by differential scanning calorimeter (DSC) at a heating rate of 10 ° C./min: −) 7 ° C.) 250 parts by weight, Cureazole 2PZ-CN (trade name, manufactured by Shikoku Chemical Industry Co., Ltd., 1-cyano) as a curing accelerator Resin composition comprising 0.5 parts by weight of tyl-2-phenylimidazole) and 0.7 parts by weight of NUC A-187 (trade name of Nippon Unicar Co., Ltd., γ-glycidoxypropyltrimethoxysilane) as a coupling agent Cyclohexanone was added thereto, and the mixture was stirred and mixed. An adhesive resin varnish degassed under vacuum was applied on a release-treated polyethylene terephthalate film having a thickness of 50 μm, and dried by heating at 140 ° C. for 5 minutes to obtain a film having a thickness of 25 μm. An adhesive layer with a release film in the B-stage state was obtained. This was laminated with a hot roll laminator (Riston manufactured by Du Pont) on a UV tape for dicing (UC-353EP-110 manufactured by Furukawa Electric Co., Ltd., tack strength α = 1N, tack strength β = 0.2N) as a base sheet. Thus, an adhesive sheet was obtained.
[0062]
Next, the properties of the adhesive sheet after leaving it for 1, 30, and 90 days were evaluated by the following methods.
[0063]
A semiconductor wafer having a thickness of 150 μm was attached to the adhesive layer of the obtained adhesive sheet, and was placed and fixed on a dicing apparatus. The semiconductor wafer was diced at a speed of 100 mm / sec into 5 mm × 5 mm. Here, the chip jump at the time of dicing was evaluated based on the probability (% / 100 chips) that the chip (semiconductor element) jumped at the time of dicing. Table 1 shows the results.
[0064]
Thereafter, the semiconductor device with the adhesive layer was picked up by a pick-up device, and the semiconductor device was bonded to a 25-μm-thick polyimide film as a support member for mounting the semiconductor device to obtain a semiconductor device sample (a solder ball was formed on one surface). The heat resistance of this sample was examined. The heat resistance was evaluated by reflow crack resistance and temperature cycle resistance test. In the reflow crack resistance test, a process of passing the sample through an IR reflow furnace set at a maximum temperature of the sample surface of 240 ° C. and maintaining this temperature for 20 seconds, and cooling the sample by leaving it at room temperature was repeated twice. Cracks in the sample were visually observed and observed with an ultrasonic microscope. In all ten samples, no cracks were generated, and in each case, one or more samples were evaluated as x. In addition, the temperature cycle resistance test was performed by leaving a sample in an atmosphere of -55 ° C for 30 minutes and then leaving it in an atmosphere of 125 ° C for 30 minutes as one cycle. Destruction such as cracks was judged. In all of the ten samples, those in which these problems did not occur were evaluated as ○, and those in which one or more occurred were evaluated as ×. Table 1 shows the results.
[0065]
On the other hand, after the dicing, separately from the production of the semiconductor device sample, using a UV-330 HQP-2 type exposure machine manufactured by Oak Manufacturing Co., Ltd., 500 mJ / cm 2 The substrate sheet of the adhesive sheet was exposed with the exposure amount of, and the semiconductor element with the adhesive layer was picked up by a pickup device. Here, the pickup property of the semiconductor element with an adhesive layer was evaluated based on the success rate (% / 100 chips) when the semiconductor element with an adhesive layer was picked up by a pickup die bonder. Table 1 shows the results.
[0066]
[Table 1]
Figure 2004256695
[0067]
From Table 1, it can be seen that the adhesive sheet of the present invention has excellent heat resistance, has no chip fly during dicing, and has good pickup properties.
[0068]
【The invention's effect】
According to the present invention, it is possible to provide an adhesive sheet that acts as a dicing tape in a dicing step and can be used as an adhesive sheet having excellent connection reliability in a joining step between a semiconductor element and a support member, and furthermore, can be stored for a long time. Even after use, an adhesive sheet having a stable interfacial peel strength between the base material sheet and the adhesive layer can be provided. In other words, it is possible to provide an adhesive sheet whose working life is greatly extended as compared with the related art.
[0069]
Further, the adhesive sheet of the present invention is an adhesive sheet having heat resistance required when a semiconductor element having a large difference in thermal expansion coefficient is mounted on a support member for mounting a semiconductor element, and having excellent workability.
[0070]
Further, by manufacturing a semiconductor device using the adhesive sheet of the present invention, the process can be simplified.
[Brief description of the drawings]
FIG. 1 is a sectional view of an example of an adhesive sheet according to the present invention.
FIG. 2 is a cross-sectional view of another example of the adhesive sheet according to the present invention.
FIG. 3 is a view showing a state in which a semiconductor wafer is attached to an adhesive sheet according to the present invention.
FIG. 4 is a view showing the use of the adhesive sheet according to the present invention in a dicing process of a semiconductor wafer.
FIG. 5 is a view showing a state in which the adhesive sheet according to the present invention is irradiated with radiation from the base material layer side.
FIG. 6 is a view showing a step of picking up a semiconductor element from the adhesive sheet according to the present invention.
FIG. 7 is a view showing a semiconductor element with an adhesive layer picked up;
FIG. 8 is a view showing a state in which a semiconductor element is thermocompression-bonded to a semiconductor element mounting support member.
[Explanation of symbols]
1 Base sheet
1a Base material layer in base material sheet
1b Adhesive layer in base sheet
2 adhesive layer
3 Release sheet
4 Suction collet
5 Supporting member for mounting semiconductor element
6 dicing cutter
10, 11 adhesive sheet
A semiconductor wafer
A1, A2, A3 ... Semiconductor element
B radiation

Claims (10)

高分子量樹脂成分と重量平均分子量3000以下の低分子量樹脂成分とを主成分とする接着剤層、および粘着性を有する基材シートが少なくとも積層された接着シートであって、
1)前記接着剤層は、表面近傍1μmに存在する前記低分子量樹脂成分の含有比率aが40重量%未満であり、25℃における5.1mmΦプローブ測定によるタック強度Aが0.001〜0.3Nであり、60℃における5.1mmΦプローブ測定によるタック強度Bが0.5N以上であり、かつ(タック強度B/タック強度A)>4を満たし、
2)少なくとも前記基材シートの前記接着剤層と接する層の、放射線照射前の25℃における5.1mmΦプローブ測定によるタック強度αが0.05〜5Nであり、放射線照射後の25℃における5.1mmΦプローブ測定によるタック強度βが0〜4.95Nであることを特徴とする接着シート。
An adhesive layer comprising a high-molecular-weight resin component and a low-molecular-weight resin component having a weight-average molecular weight of 3,000 or less as main components, and an adhesive sheet in which at least a tacky base sheet is laminated,
1) In the adhesive layer, the content ratio a of the low-molecular-weight resin component existing in the vicinity of 1 μm in the surface is less than 40% by weight, and the tack strength A by a 5.1 mmφ probe measurement at 25 ° C. is 0.001 to 0. 3N, tack strength B measured by a 5.1 mmφ probe at 60 ° C. is 0.5 N or more, and (tack strength B / tack strength A)> 4 is satisfied;
2) At least the layer in contact with the adhesive layer of the base material sheet has a tack strength α of 0.05 to 5 N at 25 ° C. before irradiation with a 5.1 mmΦ probe, and 5 at 25 ° C. after irradiation. An adhesive sheet having a tack strength β of 0 to 4.95 N measured by a 1 mmφ probe.
前記基材シートが、基材層および該基材層の少なくとも片面に積層された粘着剤層を有するものであることを特徴とする請求項1記載の接着シート。The adhesive sheet according to claim 1, wherein the base sheet has a base layer and an adhesive layer laminated on at least one surface of the base layer. 前記粘着剤層はアクリルモノマ、アクリルオリゴマあるいはその重合体を主成分としたものであることを特徴とする請求項2記載の接着シート。The adhesive sheet according to claim 2, wherein the pressure-sensitive adhesive layer is mainly composed of an acrylic monomer, an acrylic oligomer, or a polymer thereof. 前記接着剤層、前記粘着剤層および前記基材層が、基材層/粘着剤層/接着剤層の順で積層されていることを特徴とする請求項2または3記載の接着シート。The adhesive sheet according to claim 2, wherein the adhesive layer, the adhesive layer, and the base layer are laminated in the order of base layer / adhesive layer / adhesive layer. 前記接着剤層の表面近傍1μmの前記低分子量樹脂成分の含有比率aと中心部の前記低分子量樹脂成分の含有比率bが、b>a×1.2を満たすことを特徴とする請求項1〜4のいずれかに記載の接着シート。The content ratio a of the low-molecular-weight resin component at 1 μm near the surface of the adhesive layer and the content ratio b of the low-molecular-weight resin component at the center satisfy b> a × 1.2. The adhesive sheet according to any one of Items 1 to 4, wherein 前記高分子量樹脂成分の重量平均分子量が5万以上であり、かつそのTg(ガラス転移温度)が−50℃以上70℃以下であることを特徴とする請求項1〜5のいずれかに記載の接着シート。The weight-average molecular weight of the high-molecular-weight resin component is 50,000 or more, and its Tg (glass transition temperature) is -50C or more and 70C or less. Adhesive sheet. 前記接着剤層が、前記低分子量樹脂成分としてエポキシ樹脂とその硬化剤100重量部、前記高分子量樹脂成分としてグリシジル(メタ)アクリレート0.5〜10重量部を含み、重量平均分子量が5万以上であり、かつTg(ガラス転移温度)が−50℃以上70℃以下であるエポキシ基含有アクリル系共重合体50〜900重量部を含むことを特徴とする請求項1〜6のいずれかに記載の接着シート。The adhesive layer contains 100 parts by weight of an epoxy resin and its curing agent as the low molecular weight resin component, and 0.5 to 10 parts by weight of glycidyl (meth) acrylate as the high molecular weight resin component, and has a weight average molecular weight of 50,000 or more. And containing 50 to 900 parts by weight of an epoxy group-containing acrylic copolymer having a Tg (glass transition temperature) of -50 ° C or more and 70 ° C or less. Adhesive sheet. 請求項1〜7のいずれかに記載の接着シートを用いて、半導体素子と半導体素子搭載用支持部材とを接着したことを特徴とする半導体装置。A semiconductor device, wherein a semiconductor element and a semiconductor element mounting support member are bonded using the adhesive sheet according to claim 1. 請求項1〜7のいずれかに記載の接着シートの接着剤層面に半導体ウエハを貼り付ける工程、
前記半導体ウエハを前記接着シートとともに固定し、これを所定の大きさにダイシングし、半導体素子を形成する工程、
前記接着剤層と基材シートの界面で剥離し、接着剤層付き半導体素子を得る工程、および
前記接着剤層付き半導体素子と半導体素子搭載用支持部材とを前記接着剤層を介して所定位置に接着する工程、
を含む半導体装置の製造方法。
A step of attaching a semiconductor wafer to the adhesive layer surface of the adhesive sheet according to any one of claims 1 to 7,
Fixing the semiconductor wafer together with the adhesive sheet, dicing this to a predetermined size, and forming a semiconductor element;
Peeling off at the interface between the adhesive layer and the base material sheet to obtain a semiconductor element with an adhesive layer, and positioning the semiconductor element with the adhesive layer and the supporting member for mounting the semiconductor element at a predetermined position via the adhesive layer; Bonding to the
A method for manufacturing a semiconductor device including:
ダイシング後、前記接着剤層と前記基材シートの界面で剥離する前に、前記基材シート側から放射線を照射する工程を有することを特徴とする請求項9記載の半導体装置の製造方法。The method of manufacturing a semiconductor device according to claim 9, further comprising a step of irradiating radiation from the substrate sheet side after the dicing and before peeling off at an interface between the adhesive layer and the substrate sheet.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005303275A (en) * 2004-03-15 2005-10-27 Hitachi Chem Co Ltd Dicing/die boding sheet
JP2007311727A (en) * 2006-05-22 2007-11-29 Sumitomo Bakelite Co Ltd Manufacturing method of semiconductor element and of semiconductor package
JP2010225643A (en) * 2009-03-19 2010-10-07 Furukawa Electric Co Ltd:The Tape for wafer processing
US8217115B2 (en) * 2006-10-30 2012-07-10 Sumitomo Bakelite Company, Ltd Liquid resin composition, semiconductor wafer having adhesive layer, semiconductor element having adhesive layer, semiconductor package, process for manufacturing semiconductor element and process for manufacturing semiconductor package
JP2013131547A (en) * 2011-12-20 2013-07-04 Hitachi Chemical Co Ltd Dicing/die bonding integrated tape, and method of manufacturing semiconductor device
CN106189897A (en) * 2015-05-27 2016-12-07 日东电工株式会社 Diced chip bonding film, the manufacture method of semiconductor device and semiconductor device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000208446A (en) * 1999-01-19 2000-07-28 Fujitsu Ltd Manufacture of semiconductor device and semiconductor manufacturing apparatus
WO2001060938A1 (en) * 2000-02-15 2001-08-23 Hitachi Chemical Co., Ltd. Adhesive composition, process for producing the same, adhesive film made with the same, substrate for semiconductor mounting, and semiconductor device
JP2001354930A (en) * 2000-06-15 2001-12-25 Furukawa Electric Co Ltd:The Radioactive ray curable adhesive type
JP2002226796A (en) * 2001-01-29 2002-08-14 Hitachi Chem Co Ltd Pressure-sensitive adhesive sheet for sticking wafer and semiconductor device
JP2002265888A (en) * 2001-03-15 2002-09-18 Hitachi Chem Co Ltd Adhesive film and its use and method for producing semiconductor device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000208446A (en) * 1999-01-19 2000-07-28 Fujitsu Ltd Manufacture of semiconductor device and semiconductor manufacturing apparatus
WO2001060938A1 (en) * 2000-02-15 2001-08-23 Hitachi Chemical Co., Ltd. Adhesive composition, process for producing the same, adhesive film made with the same, substrate for semiconductor mounting, and semiconductor device
JP2001354930A (en) * 2000-06-15 2001-12-25 Furukawa Electric Co Ltd:The Radioactive ray curable adhesive type
JP2002226796A (en) * 2001-01-29 2002-08-14 Hitachi Chem Co Ltd Pressure-sensitive adhesive sheet for sticking wafer and semiconductor device
JP2002265888A (en) * 2001-03-15 2002-09-18 Hitachi Chem Co Ltd Adhesive film and its use and method for producing semiconductor device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005303275A (en) * 2004-03-15 2005-10-27 Hitachi Chem Co Ltd Dicing/die boding sheet
JP2007311727A (en) * 2006-05-22 2007-11-29 Sumitomo Bakelite Co Ltd Manufacturing method of semiconductor element and of semiconductor package
US8217115B2 (en) * 2006-10-30 2012-07-10 Sumitomo Bakelite Company, Ltd Liquid resin composition, semiconductor wafer having adhesive layer, semiconductor element having adhesive layer, semiconductor package, process for manufacturing semiconductor element and process for manufacturing semiconductor package
TWI422661B (en) * 2006-10-30 2014-01-11 Sumitomo Bakelite Co Liquid resin composition, semiconductor wafer with adhesive layer, semiconductor element with adhesive layer, semiconductor package, method for manufacturing semiconductor element, and method for manufacturing semiconductor package
JP2010225643A (en) * 2009-03-19 2010-10-07 Furukawa Electric Co Ltd:The Tape for wafer processing
JP2013131547A (en) * 2011-12-20 2013-07-04 Hitachi Chemical Co Ltd Dicing/die bonding integrated tape, and method of manufacturing semiconductor device
CN106189897A (en) * 2015-05-27 2016-12-07 日东电工株式会社 Diced chip bonding film, the manufacture method of semiconductor device and semiconductor device
JP2016225342A (en) * 2015-05-27 2016-12-28 日東電工株式会社 Dicing die bonding film, method of manufacturing semiconductor device, and semiconductor device

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