JPWO2020013250A1 - 半導体装置の製造方法、熱硬化性樹脂組成物及びダイシング・ダイボンディング一体型フィルム - Google Patents
半導体装置の製造方法、熱硬化性樹脂組成物及びダイシング・ダイボンディング一体型フィルム Download PDFInfo
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- JPWO2020013250A1 JPWO2020013250A1 JP2020530241A JP2020530241A JPWO2020013250A1 JP WO2020013250 A1 JPWO2020013250 A1 JP WO2020013250A1 JP 2020530241 A JP2020530241 A JP 2020530241A JP 2020530241 A JP2020530241 A JP 2020530241A JP WO2020013250 A1 JPWO2020013250 A1 JP WO2020013250A1
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- thermosetting resin
- resin composition
- film
- dicing
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Images
Classifications
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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Abstract
Description
・複雑な回路層及び薄い半導体層に起因して、上述のとおり、半導体素子S1,S2,S3,S4が反りやすい性質(反り応力)を有している。
・複数の半導体素子を横方向に位置をずらして積層することでオーバーハング部Hが形成されている。
・二段目の半導体素子S2をマウントした段階では剥離が起きないことは確認済みであるから、三段目及び四段目の半導体素子S3,S4をマウントすることで、二段目の半導体素子S2のハングオーバー部Hに上方向の力(一段目の半導体素子S1との間で剥離させる方向の反り応力)が増大する。
図1は本実施形態に係る半導体装置を模式的に示す断面図である。この図に示す半導体装置100は、基板10と、基板10の表面上に積層された四つの半導体素子S1,S2,S3,S4と、基板10の表面上の電極(不図示)と四つの半導体素子S1,S2,S3,S4とを電気的に接続するワイヤW1,W2,W3,W4と、これらを封止している封止層50とを備える。
図2は接着剤付き半導体素子の一例を模式的に示す断面図である。図2に示す接着剤付き半導体素子20は、フィルム状接着剤3Pと半導体素子S1とからなる。図2に示すとおり、フィルム状接着剤3Pと半導体素子S1は実質的に同じサイズである。これは、フィルム状接着剤3Pと半導体素子S2,S3,S4についても同様である。接着剤付き半導体素子20は、次に説明するとおり、ダイシング工程及びピックアップ工程を経て作製される。
図4〜図6を参照しながら、半導体装置100の製造方法について説明する。まず、図4に示すように、基板10の表面上に一段目の半導体素子S1を圧着する。すなわち、接着剤付き半導体素子20のフィルム状接着剤3Pを介して半導体素子S1を基板10の所定の位置に圧着する。この圧着処理は、例えば、80〜180℃、0.01〜0.50MPaの条件で、0.5〜3.0秒間にわたって実施することが好ましい。次に、加熱によってフィルム状接着剤3Pを硬化させる。この硬化処理は、例えば、60〜175℃、0.01〜1.0MPaの条件で、5分間以上にわたって実施することが好ましい。これにより、フィルム状接着剤3Pが硬化して硬化物3となる。フィルム状接着剤3Pの硬化処理は、ボイドの低減の観点から、加圧雰囲気下で実施してもよい。
フィルム状接着剤3Pを構成する熱硬化性樹脂組成物について説明する。なお、フィルム状接着剤3Pは接着層3Aを個片化したものであり、両者は同じ熱硬化性樹脂組成物からなる。この熱硬化性樹脂組成物は、例えば、半硬化(Bステージ)状態を経て、その後の硬化処理によって完全硬化物(Cステージ)状態となり得るものである。
・動的粘弾性測定装置:Rheogel E−4000(株式会社ユービーエム製)
・測定対象:フィルム状に成形した熱硬化性樹脂組成物
・昇温速度:3℃/分
・周波数:10Hz
(a)熱硬化性樹脂(以下、単に「(a)成分」という場合がある。)
(b)高分子量成分(以下、単に「(b)成分」という場合がある。)
(c)フィラー(以下、単に「(c)成分」という場合がある。)
本実施形態においては、(a)熱硬化性樹脂がエポキシ樹脂(以下、単に「(a1)成分」という場合がある。)を含む場合、(a)熱硬化性樹脂は、エポキシ樹脂の硬化剤となり得るフェノール樹脂(以下、単に「(a2)成分」という場合がある。)を含むことが好ましい。なお、(b)高分子量成分がフェノール樹脂と熱硬化する官能基(グリシジル基等)を有する場合、(a)熱硬化性樹脂としてエポキシ樹脂を別途用いなくともよい。
(d)カップリング剤(以下、単に「(d)成分」という場合がある。)
(e)硬化促進剤(以下、単に「(e)成分」という場合がある。)
・(a)熱硬化性樹脂
(a1)成分は、分子内にエポキシ基を有するものであれば、特に制限なく用いることができる。(a1)成分としては、例えば、ビスフェノールA型エポキシ樹脂、ビスフェノールF型エポキシ樹脂、ビスフェノールS型エポキシ樹脂、フェノールノボラック型エポキシ樹脂、クレゾールノボラック型エポキシ樹脂、ビスフェノールAノボラック型エポキシ樹脂、ビスフェノールFノボラック型エポキシ樹脂、ジシクロペンタジエン骨格含有エポキシ樹脂、スチルベン型エポキシ樹脂、トリアジン骨格含有エポキシ樹脂、フルオレン骨格含有エポキシ樹脂、トリフェノールフェノールメタン型エポキシ樹脂、ビフェニル型エポキシ樹脂、キシリレン型エポキシ樹脂、ビフェニルアラルキル型エポキシ樹脂、ナフタレン型エポキシ樹脂、多官能フェノール類、アントラセン等の多環芳香族類のジグリシジルエーテル化合物などが挙げられる。これらは、1種を単独で又は2種以上を組み合わせて用いてもよい。これらの中でも、(a1)成分は、耐熱性の観点から、クレゾールノボラック型エポキシ樹脂、ビスフェノールF型エポキシ樹脂、又はビスフェノールA型エポキシ樹脂であってもよい。
(b)成分は、ガラス転移温度(Tg)が50℃以下であるものが好ましい。(b)成分としては、例えば、アクリル樹脂、ポリエステル樹脂、ポリアミド樹脂、ポリイミド樹脂、シリコーン樹脂、ブタジエン樹脂、アクリロニトリル樹脂及びこれらの変性体等が挙げられる。
(c)成分としては、例えば、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、ホウ酸アルミウィスカ、窒化ホウ素、シリカ等の無機フィラーが挙げられる。これらは、1種を単独で又は2種以上を組み合わせて用いてもよい。これらの中でも、(c)成分は、樹脂との相溶性の観点から、シリカであってもよい。
(d)成分は、シランカップリング剤であってよい。シランカップリング剤としては、例えば、γ−ウレイドプロピルトリエトキシシラン、γ−メルカプトプロピルトリメトキシシラン、3−フェニルアミノプロピルトリメトキシシラン、3−(2−アミノエチル)アミノプロピルトリメトキシシラン等が挙げられる。これらは、1種を単独で又は2種以上を組み合わせて用いてもよい。
(e)成分は、特に限定されず、一般に使用されるものを用いることができる。(e)成分としては、例えば、イミダゾール類及びその誘導体、有機リン系化合物、第二級アミン類、第三級アミン類、第四級アンモニウム塩等が挙げられる。これらは、1種を単独で又は2種以上を組み合わせて用いてもよい。これらの中でも、反応性の観点から(e)成分はイミダゾール類及びその誘導体であってもよい。
図3(a)に示すダイシング・ダイボンディング一体型フィルム8及びその製造方法について説明する。フィルム8の製造方法は、溶剤を含有する接着剤組成物のワニスを接着層用の基材フィルム(不図示)上に塗布する工程と、塗布されたワニスを50〜150℃で加熱乾燥することによって接着層3Aを形成する工程とを含む。
表1〜4に示す成分を含むワニス(計17種類)を次のようにして調製した。すなわち、熱硬化性樹脂としてのエポキシ樹脂及びフェノール樹脂と、フィラーとを含む組成物にシクロヘキサノンを加えて撹拌した。これに、高分子量成分としてのアクリルゴムを加えて撹拌した後、カップリング剤及び硬化促進剤を更に加え、各成分が十分に均一になるまで撹拌することによってワニスを得た。
(エポキシ樹脂)
・YDCN−700−10:クレゾールノボラック型エポキシ樹脂、新日鉄住金化学株式会社製、エポキシ当量210、軟化点75〜85℃
・EXA−830CRP(商品名):ビスフェノールF型エポキシ樹脂、DIC株式会社製、エポキシ当量162、常温で液体
・YDF−8170C:ビスフェノールF型エポキシ樹脂、新日鉄住金化学株式会社製、エポキシ当量159、常温で液体
(フェノール樹脂)
・ミレックスXLC−LL(「ミレックス」は登録商標):三井化学株式会社製、水酸基当量175、軟化点77℃
・フェノライトLF−4871(「フェノライト」は登録商標):DIC株式会社製、水酸基当量118、軟化点130℃
(高分子量成分)
・HTR−860P:ナガセケムテックス株式会社製、アクリルゴム、重量平均分子量80万、Tg−7℃
(フィラー)
・SC−2050−HLG:アドマテックス株式会社製、シリカフィラー分散液、平均粒径0.50μm、最大粒径1.0μm以下
・アエロジルR972(「アエロジル」は登録商標):、日本アエロジル株式会社製、シリカ粒子、平均粒径0.016μm、最大粒径1.0μm以下
(カップリング剤)
・A−189:γ―メルカプトプロピルトリメトキシシラン、モメンティブ・パフォーマンス・マテリアルズ・ジャパン合同会社製
・A−1160:γ―ウレイドプロピルトリエトキシシラン、モメンティブ・パフォーマンス・マテリアルズ・ジャパン合同会社製
(硬化促進剤)
・キュアゾール2PZ−CN(「キュアゾール」は登録商標):1−シアノエチル−2−フェニルイミダゾール、四国化成工業株式会社製
フィルム状接着剤の120℃における溶融粘度は次の方法で測定した。すなわち、厚さ7μmのフィルム状接着剤を複数積層することによって厚さを約300μmとし、これを10mm×10mmのサイズに打ち抜くことによって測定用の試料を得た。動的粘弾性装置ARES(TA Instruments社製)に直径8mmの円形アルミプレート治具をセットし、更にここに上記試料をセットした。その後、35℃で5%の歪みを与えながら5℃/分の昇温速度で130℃まで昇温させながら測定し、120℃のときの溶融粘度の値を記録した。表1〜4に結果を示す。
株式会社ユービーエム製の動的粘弾性測定装置(Rheogel E−4000)を用いてフィルム状接着剤の35℃における貯蔵弾性率を測定した。すなわち、厚さ7μmのフィルム状接着剤を複数積層することによって厚さを約170μmとし、これを幅4mm×長さ33mmのサイズにすることによって測定用の試料を得た。試料を動的粘弾性測定装置(製品名:Rheogel E−4000、株式会社ユービーエム製)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、35℃における貯蔵弾性率を測定した。表1〜4に結果を示す。
実施例及び比較例に係る各フィルム状接着剤(厚さ120μm)とダイシング用粘着フィルム(マクセル株式会社製)とを貼り合わせることによって、ダイシング・ダイボンディング一体型フィルムを作製した。
・レーザー光源:半導体レーザー励起Nd(YAGレーザー)
波長:1064nm
レーザー光スポット断面積:3.14×10−8cm2
発振形態:Qスイッチパルス
繰り返し周波数:100kHz
パルス幅:30ns
出力:20μJ/パルス
レーザー光品質:TEM00
偏光特性:直線偏光
・集光用レンズ倍率:50倍
・NA:0.55
・レーザー光波長に対する透過率:60%
・半導体ウェハが載置される台の移動速度:100mm/秒
装置:(株)ディスコ製DDS2300(Fully Automatic Die Separator)
クールエキスパンド条件:
温度:−15℃、高さ(Height):9mm、冷却時間:60秒
スピード:300mm/秒、待機時間(Waiting time):0秒
・ピンの突上げ速度:10mm/秒
・突上げ高さ:200μm
A:未分断の接着剤付き半導体素子がなかった。
B:未分断の接着剤付き半導体素子が1個以上あった。
フィルム状接着剤が好適に分断されていた試料(接着剤付き半導体素子)を使用し、図5(a)に示す構造体と同じ構成の構造体を実施例又は比較例について作製した。四段目の半導体素子を積層した後において、一段目と二段目との間に剥離が生じたか否かを目視で観察し、以下の基準で評価を行った。表1〜4に結果を示す。
A:全ての試料において剥離が生じなかった。
B:剥離が生じた試料が1個以上であった。
剥離の有無に関する評価のために作製した試料のうち、剥離が生じていない試料を使用して次の方法で耐リフロー性の評価を行った。すなわち、四段に積層された半導体素子をモールド用封止材(日立化成(株)製、商品名「CEL−9750ZHF10)で封止することによって、評価用のパッケージを得た。なお、樹脂封止の条件は175℃/6.7MPa/90秒とし、硬化の条件は175℃、5時間とした。
上記パッケージを20個準備し、これらをJEDECで定めた環境下(レベル3、30℃、60RH%、192時間)に曝して吸湿させた。続いて、IRリフロー炉(260℃、最高温度265℃)に吸湿後のパッケージを3回通過させた。以下の基準で評価を行った。表1〜4に結果を示す。
A:パッケージの破損、厚みの変化、フィルム状接着剤と半導体素子との界面での剥離等が20個のパッケージのうち1個も観察されなかった。
B:パッケージの破損、厚みの変化、フィルム状接着剤と半導体素子との界面での剥離等が20個のパッケージのうち少なくとも1個観察された。
Claims (13)
- 120℃における溶融粘度が3100Pa・s以上である熱硬化性樹脂組成物からなる接着層と、粘着層と、基材フィルムとをこの順序で備えるダイシング・ダイボンディング一体型フィルムを準備する工程と、
前記ダイシング・ダイボンディング一体型フィルムの前記接着層側の面と、半導体ウェハとを貼り合わせる工程と、
前記半導体ウェハをダイシングする工程と、
前記基材フィルムをエキスパンドすることによって、前記半導体ウェハ及び前記接着層が個片化されてなる接着剤付き半導体素子を得る工程と、
前記接着剤付き半導体素子を前記粘着層からピックアップする工程と、
前記接着剤付き半導体素子を他の半導体素子に対して当該接着剤付き半導体素子の接着剤を介して積層する工程と、
前記接着剤を熱硬化させる工程と、
を含む、半導体装置の製造方法。 - 前記接着層の35℃における貯蔵弾性率が70MPa以上である、請求項1に記載の半導体装置の製造方法。
- ステルスダイシング及びブレードダイシングの一方によって前記半導体ウェハを個片化するとともに、前記基材フィルムを冷却条件下においてエキスパンドする、請求項1又は2に記載の半導体装置の製造方法。
- 前記熱硬化性樹脂組成物は、熱硬化性樹脂と、分子量10万〜100万の高分子量成分と、フィラーとを含有し、
前記熱硬化性樹脂組成物の全質量を基準として、前記高分子量成分の含有量が15〜66質量%である、請求項1〜3のいずれか一項に記載の半導体装置の製造方法。 - 前記熱硬化性樹脂組成物の全質量を基準として、前記フィラーの含有量が25〜45質量%である、請求項4に記載の半導体装置の製造方法。
- 三次元NAND型メモリを製造する方法である、請求項1〜5のいずれか一項に記載の半導体装置の製造方法。
- 半導体装置の製造プロセスにおいて使用される熱硬化性樹脂組成物であって、
120℃における溶融粘度が3100Pa・s以上である、熱硬化性樹脂組成物。 - 35℃における貯蔵弾性率が70MPa以上である、請求項7に記載の熱硬化性樹脂組成物。
- 熱硬化性樹脂と、分子量10万〜100万の高分子量成分と、フィラーとを含有し、
当該熱硬化性樹脂組成物の全質量を基準として、前記高分子量成分の含有量が15〜66質量%である、請求項7又は8に記載の熱硬化性樹脂組成物。 - 当該熱硬化性樹脂組成物の全質量を基準として、前記フィラーの含有量が25〜45質量%である、請求項9に記載の熱硬化性樹脂組成物。
- 三次元NAND型メモリの製造プロセスにおいて使用される、請求項7〜10のいずれか一項に記載の熱硬化性樹脂組成物。
- 粘着層と、
請求項7〜11のいずれか一項に記載の熱硬化性樹脂組成物からなる接着層と、
を備える、ダイシング・ダイボンディング一体型フィルム。 - 前記接着層の厚さが3〜40μmである、請求項12に記載のダイシング・ダイボンディング一体型フィルム。
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