JP6443343B2 - 仮固定用フィルム、仮固定用フィルムシート及び半導体装置 - Google Patents
仮固定用フィルム、仮固定用フィルムシート及び半導体装置 Download PDFInfo
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- JP6443343B2 JP6443343B2 JP2015554949A JP2015554949A JP6443343B2 JP 6443343 B2 JP6443343 B2 JP 6443343B2 JP 2015554949 A JP2015554949 A JP 2015554949A JP 2015554949 A JP2015554949 A JP 2015554949A JP 6443343 B2 JP6443343 B2 JP 6443343B2
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- film
- temporary fixing
- semiconductor wafer
- fixing film
- support
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Description
本実施形態に係る仮固定用フィルムは、半導体ウェハを支持体に仮固定用フィルムを介して仮固定する仮固定工程と、支持体に仮固定された半導体ウェハを加工する加工工程と、加工された半導体ウェハを支持体及び仮固定用フィルムから分離する分離工程と、を備える半導体ウェハの加工方法に用いられる仮固定用フィルムであって、(A)高分子量成分及び(B)シリコーン変性樹脂を含有し、110℃で30分間及び170℃で1時間加熱された後の弾性率が23℃において0.1〜1000MPaであることを特徴とする。
本実施形態に係る半導体ウェハの加工方法は、大きく分けて以下の4工程からなる。(a)半導体ウェハと支持体とを仮固定用フィルムを介して仮固定する仮固定工程と、(b)支持体に仮固定された半導体ウェハを加工する加工工程と、(c)加工された半導体ウェハを支持体及び仮固定用フィルムから分離する分離工程と、(d)半導体ウェハに残渣がある場合に洗浄する洗浄工程とからなる。
図3の(A)は、支持体50及び半導体ウェハ60の間に、本実施形態に係る仮固定用フィルム40を介在させ、支持体50に半導体ウェハ60を仮固定する工程を示す。
加工工程には、ウェハレベルで用いられる研削、電極形成、金属配線形成、保護膜形成などが含まれる。研削方式には特に制限はなく、公知の研削方式が利用できる。研削は半導体ウェハと砥石(ダイヤモンドなど)とに水をかけて冷却しながら行うことが好ましい。
図4は、加工された半導体ウェハを支持体及び仮固定用フィルムから分離する分離工程の一実施形態を説明するための模式断面図である。本実施形態に係る分離工程は、支持体から半導体ウェハを剥離する第一の剥離工程と、半導体ウェハから仮固定用フィルムを剥離する第二の剥離工程と、を含む。第一の剥離工程は、加工工程で加工を施した半導体ウェハを支持体から剥離する工程、即ち、薄型化した半導体ウェハに様々な加工を施した後、ダイシングする前に支持体から剥離する工程である。剥離方法としては、主に半導体ウェハと支持体とを加熱(好ましくは200〜250℃)しながら、水平方向に沿って反対方向にスライドさせることにより両者を分離する方法、支持体の半導体ウェハ又は支持体の一方を水平に固定しておき、他方を水平方向から一定の角度を付けて持ち上げる方法、及び、研削された半導体ウェハの研削面に保護フィルムを貼り、半導体ウェハと保護フィルムとをピール方式で支持体から剥離する方法等が挙げられるが、特に制限なく採用することができる。
半導体ウェハの回路形成面は仮固定材の一部が残存しやすい。剥離した半導体ウェハの回路形成面に仮固定材が一部残存した場合、これを除去するための洗浄工程を設けることができる。仮固定材の除去は、例えば、半導体ウェハを洗浄することにより行うことができる。
表1又は表2に示す組成(成分及び組成比(単位:質量部))を有する組成物に、シクロヘキサノンを加え、撹拌混合してワニスを得た。
(高分子量成分)
HTR−860P−30B:(アクリルゴム、帝国化学産業株式会社製サンプル名、重量平均分子量25万、Tg:12℃)。
HTR−280−CHN:(アクリルゴム、帝国化学産業株式会社製サンプル名、重量平均分子量90万、Tg:−28℃)。
HTR−280−CHN 改17:(アクリルゴム、帝国化学産業株式会社製サンプル名、重量平均分子量90万、Tg:−10℃)。
TA31−209E: (日立化成ポリマー(株)製商品名、シリコーン変性アルキッド樹脂)
KF−105: (信越シリコーン株式会社製商品名、エポキシ変性シリコーン)
SH−550: (東レ・ダウコーニング株式会社製商品名、メチルフェニルシリコーン)
SH3773M: (東レ・ダウコーニング株式会社製商品名、ポリエーテル変性シリコーン)
キュアゾール2PZ−CN:(四国化成工業株式会社製商品名、1−シアノエチル−2−フェニルイミダゾール)。
[ポリイミド樹脂PI−1の合成]
撹拌機、温度計、窒素置換装置(窒素流入管)、及び水分受容器付きの還流冷却器を備えたフラスコ内に、ジアミンである、BAPP(商品名、東京化成製、2,2−ビス[4−(4−アミノフェノキシ)フェニル]プロパン)、分子量410.51)を10.26g(0.025mol)及び1,4−ブタンジオール ビス(3−アミノプロピル)エーテル(東京化成製、商品名:B−12、分子量:204.31)5.10g(0.025mol)と、溶媒である、N−メチル−2−ピロリドン(NMP)100gとを仕込み、撹拌してジアミンを溶媒に溶解させた。上記フラスコを氷浴中で冷却しながら、デカメチレンビストリメリテート酸二無水物(DBTA)26.11g(0.05mol)を、フラスコ内の溶液に少量ずつ添加した。添加終了後、窒素ガスを吹き込みながら溶液を180℃に昇温させて5時間保温し、ポリイミド樹脂PI−1を得た。ポリイミド樹脂PI−1の重量平均分子量は50000、Tgは70℃であった。
上記で得られた実施例1〜5、比較例1〜3の仮固定用フィルムシートについて、以下に示す方法にしたがって、溶融粘度、段差埋込性、200℃での耐熱性評価、硬化後の弾性率、30°剥離強度、及び剥離性をそれぞれ評価した。結果を表3及び4に示す。
仮固定用フィルムの溶融粘度を下記の方法により評価した。
上記で得られた仮固定用フィルム(厚み40μm)を80℃でロールラミネートし、4枚重ねることで、厚み160μmの仮固定用フィルムを得た。これを、厚み方向に10mm角に打ち抜くことで、10mm角、厚み160μmの四角形の積層体を得た。動的粘弾性装置ARES(レオメトリック・サイエンティフィック社製)に直径8mmの円形アルミプレート治具をセットし、更にここに打ち抜いた仮固定用フィルムの積層体をセットした。その後、35℃で5%の歪みを与えながら20℃/分の昇温速度で150℃まで昇温させながら測定し、120℃での溶融粘度を記録した。
フィルム状粘着剤の段差埋込性を下記の方法により評価した。
上記で得られた仮固定用フィルム(厚み40μm)を80℃でロールラミネートし、2枚重ねることで、厚み80μmの仮固定用フィルムを得た。次に、厚み625μmシリコンミラーウェハ(6インチ)表面に、ブレードダイシングにより幅40μm、深さ40μmの溝を100μm間隔で作製した。このようにして作製した段差付きシリコンミラーウェハの段差が上面となるように真空ラミネーター((株)エヌ・ピー・シー製、LM−50X50−S)のステージ上に置き、上記で得られた仮固定用フィルムを段差付きシリコンミラーウェハ側に貼り付くように設置し、120℃/0.1MPa/2分、15mbarで真空ラミネートした。得られたサンプルを断面観察し、ブレードダイシングで作製した溝の埋込性を評価した。埋込性の評価基準は以下の通りである。
○:ボイドの割合が5%未満。
×:ボイドの割合が5%以上。
仮固定用フィルムの200℃での耐熱性を下記の方法により評価した。
厚み625μmシリコンミラーウェハ(6インチ)をブレードダイシングにより25mm角に小片化した。小片化したシリコンミラーウェハ表面に、仮固定用フィルムが貼り付くように80℃でロールラミネートした。次に、仮固定用フィルム上に厚みが0.1〜0.2mmで大きさが約18mm角のスライドガラスを80℃でロールラミネートし、仮固定用フィルムがシリコンウェハとスライドガラスで挟まれた積層品を作製した。得られたサンプルを110℃で30分間加熱し、続いて170℃で1時間加熱して仮固定用フィルムを硬化させ、その後、200℃で30分間加熱した。
○:ボイドの割合が5%未満。
×:ボイドの割合が5%以上。
仮固定用フィルムの硬化後の引っ張り弾性率を下記の方法により評価した。
上記で得られた仮固定用フィルム(厚み各40μm)を80℃でロールラミネートし、3枚重ねることで、厚み120μmの仮固定用フィルムを得た。110℃のオーブンで30分、さらに170℃で1時間加熱した後、厚み方向に4mm幅、長さ33mmに切り出した。なお、仮固定用フィルムシートの支持フィルムは剥離除去した。得られたサンプルを動的粘弾性装置(製品名:Rheogel−E4000、(株)UMB製)にセットし、引張り荷重をかけて、周波数10Hz、昇温速度3℃/分で測定し、23℃での測定値を記録した。
シリコンウェハ及び仮固定用フィルムの間の30°剥離強度を下記の方法により評価した。
厚み625μmシリコンミラーウェハ(6インチ)表面に、ブレードダイシングにより幅40μm、深さ40μmの溝を100μm間隔で作製した。このようにして作製した段差付きシリコンミラーウェハの段差が上面となるように真空ラミネーター((株)エヌ・ピー・シー製、LM−50X50−S)のステージ上に置き、上記で得られた仮固定用フィルムを段差付きシリコンミラーウェハ側に貼り付くように設置し、120℃/0.1MPa/2分、15mbarで真空ラミネートした。得られたサンプルを110℃で30分間加熱し、続いて170℃で1時間加熱して硬化させ、その後、200℃で30分間加熱した後、10mm幅に切り出した。これを、剥離角度が30°となるように設定した剥離試験機で300mm/分の速度で剥離試験を実施し、そのときの剥離強度を記録した。
仮固定用フィルムのデボンド装置での剥離性を下記の方法により評価した。
上記で得られた仮固定用フィルム(厚み40μm)と支持フィルム(厚み60μm)とを80℃でロールラミネートし、厚み100μmのフィルムを得た。
Claims (8)
- 半導体ウェハを支持体に仮固定用フィルムを介して仮固定する仮固定工程と、前記支持体に仮固定された前記半導体ウェハを加工する加工工程と、加工された前記半導体ウェハを前記支持体及び前記仮固定用フィルムから分離する分離工程と、を備える半導体ウェハの加工方法に用いられる前記仮固定用フィルムであって、
(A)高分子量成分及び(B)シリコーン変性樹脂を含有し、110℃で30分間及び170℃で1時間加熱された後の弾性率が23℃において2.6〜1000MPaであり、
硬化前の溶融粘度が120℃において8500Pa・s以下であり、且つ、厚さが10〜150μmである、仮固定用フィルム。 - 前記(A)高分子量成分が、ガラス転移温度が−50℃〜50℃であり、重量平均分子量が10万〜120万である架橋性官能基を有する(メタ)アクリル共重合体を含む、請求項1に記載の仮固定用フィルム。
- 前記(B)シリコーン変性樹脂が、シリコーン変性アルキド樹脂を含む、請求項1又は2に記載の仮固定用フィルム。
- 前記(B)シリコーン変性樹脂の含有量が、前記(A)高分子量成分100質量部に対して、1〜100質量部である、請求項1〜3のいずれか一項に記載の仮固定用フィルム。
- (C)硬化促進剤を更に含有する、請求項1〜4のいずれか一項に記載の仮固定用フィルム。
- 半導体ウェハと仮固定用フィルムとの間の30°剥離強度が300N/m以下である、請求項1〜5のいずれか一項に記載の仮固定用フィルム。
- 離型性を有する支持フィルムと、該支持フィルム上に設けられた、請求項1〜6のいずれか一項に記載の仮固定用フィルムと、を備える、仮固定用フィルムシート。
- 請求項1〜6のいずれか一項に記載の仮固定用フィルム又は請求項7に記載の仮固定用フィルムシートを用いて加工された半導体ウェハから得られる半導体素子を備える、半導体装置。
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