JP7494843B2 - ドルメン構造を有する半導体装置及びその製造方法、並びに、支持片形成用積層フィルム及びその製造方法 - Google Patents
ドルメン構造を有する半導体装置及びその製造方法、並びに、支持片形成用積層フィルム及びその製造方法 Download PDFInfo
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- JP7494843B2 JP7494843B2 JP2021516271A JP2021516271A JP7494843B2 JP 7494843 B2 JP7494843 B2 JP 7494843B2 JP 2021516271 A JP2021516271 A JP 2021516271A JP 2021516271 A JP2021516271 A JP 2021516271A JP 7494843 B2 JP7494843 B2 JP 7494843B2
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- H01L25/04—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
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Description
(1)半導体ウェハにバックグラインドテープを貼り付ける工程
(2)半導体ウェハをバックグラインドする工程
(3)ダイシングリングとその中に配置されたバックグラインド後の半導体ウェハに対し、粘着層と接着剤層とを有するフィルム(ダイシング・ダイボンディング一体型フィルム)を貼り付ける工程
(4)半導体ウェハからバックグラインドテープを剥がす工程
(5)半導体ウェハを個片化する工程
(6)半導体チップと接着剤片の積層体からなる支持片を粘着層からピックアップする工程
(7)複数の支持片を基板の所定の位置に圧着する工程
(A)基材フィルムと、粘着層と、支持片形成用フィルムとをこの順序で備える積層フィルムを準備する工程
(B)支持片形成用フィルムを個片化することによって、粘着層の表面上に複数の支持片を形成する工程
(C)粘着層から支持片をピックアップする工程
(D)基板上に第一のチップを配置する工程
(E)基板上であって第一のチップの周囲又は第一のチップが配置されるべき領域の周囲に複数の支持片を配置する工程
(F)第二のチップと、第二のチップの一方の面上に設けられた接着剤片とを備える接着剤片付きチップを準備する工程
(G)複数の支持片の表面上に接着剤片付きチップを配置することによってドルメン構造を構築する工程
上記支持片形成用フィルムは以下のフィルムのいずれか一つである。
・熱硬化性樹脂層からなるフィルム
・熱硬化性樹脂層のうち少なくとも一部を硬化させた層からなるフィルム
・熱硬化性樹脂層と、当該熱硬化性樹脂層よりも高い剛性を有する樹脂層とを有する多層フィルム
・熱硬化性樹脂層と、当該熱硬化性樹脂層よりも高い剛性を有する金属層とを有する多層フィルム
(D)工程及び(E)工程はどちらを先に実施してもよい。(D)工程を先に実施する場合、(E)工程において、基板上であって第一のチップの周囲に複数の支持片を配置すればよい。他方、(E)工程を先に実施する場合、(E)工程において、基板上であって第一のチップが配置されるべき領域の周囲に複数の支持片を配置し、その後、(D)工程において、当該領域に第一のチップを配置すればよい。なお、上記熱硬化性樹脂層の熱硬化後の剛性は樹脂層又は金属層の剛性よりも低くても高くてもよい。剛性は、物体が曲げ又はねじれに対して破壊に耐える能力を意味する。
(半導体装置)
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の表面上に配置されたチップT1(第一のチップ)と、基板10の表面上であってチップT1の周囲に配置された複数の支持片Dcと、チップT1の上方に配置されたチップT2(第二のチップ)と、チップT2と複数の支持片Dcとによって挟まれている接着剤片Tcと、チップT2上に積層されたチップT3,T4と、基板10の表面上の電極(不図示)とチップT1~T4とをそれぞれ電気的に接続する複数のワイヤwと、チップT1とチップT2との隙間等に充填された封止材50とを備える。
支持片の作製方法の一例について説明する。なお、図1に示す支持片Dcは熱硬化性樹組成物が硬化した後のものである。一方、支持片Daは熱硬化性樹組成物が完全に硬化する前の状態のものである(例えば、図5(b)参照)。
半導体装置100の製造方法について説明する。本実施形態に係る製造方法は、以下の(A)~(H)の工程を含む。
(A)積層フィルム20を準備する工程(図4参照)
(B)支持片形成用フィルムDを個片化することによって、粘着層2の表面上に複数の支持片Daを形成する工程(図5(b)参照)
(C)粘着層2から支持片Daをピックアップする工程(図5(d)参照)
(D)基板10上に第一のチップT1を配置する工程
(E)基板10上であって第一のチップT1の周囲に複数の支持片Daを配置する工程(図6参照)
(F)第二のチップT2と、第二のチップT2の一方の面上に設けられた接着剤片Taとを備える接着剤片付きチップT2aを準備する工程(図7参照)
(G)複数の支持片Dcの表面上に接着剤片付きチップT2aを配置することによってドルメン構造を構築する工程(図8参照)
(H)チップT1とチップT2との隙間等を封止材50で封止する工程(図1参照)
(D)工程は、基板10上に第一のチップT1を配置する工程である。例えば、まず、基板10上の所定の位置に接着剤層T1cを介してチップT1を配置する。その後、チップT1はワイヤwで基板10と電気的に接続される。(D)工程は、(E)工程よりも前に行われる工程であってよく、(A)工程よりも前、(A)工程と(B)工程の間、(B)工程と(C)工程の間、又は(C)工程と(E)工程の間であってもよい。
(E)工程は、基板10上であって第一のチップT1の周囲に複数の支持片Daを配置する工程である。この工程を経て、図6に示す構造体30が作製される。構造体30は、基板10と、その表面上に配置されたチップT1と、複数の支持片Daとを備える。支持片Daの配置は圧着処理によって行えばよい。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。なお、支持片Daは(E)工程の時点で完全に硬化して支持片Dcとなっていてもよく、この時点では完全硬化していなくてもよい。支持片Daは(G)工程の開始前の時点で完全硬化して支持片Dcとなっていることが好ましい。
(F)工程は、図7に示す接着剤片付きチップT2aを準備する工程である。接着剤片付きチップT2aは、チップT2と、その一方の表面に設けられた接着剤片Taとを備える。接着剤片付きチップT2aは、例えば、半導体ウェハ及びダイシング・ダイボンディング一体型フィルムを使用し、ダイシング工程及びピックアップ工程を経て得ることができる。
(G)工程は、複数の支持片Dcの上面に接着剤片Taが接するように、チップT1の上方に接着剤片付きチップT2aを配置する工程である。具体的には、支持片Dcの上面に接着剤片Taを介してチップT2を圧着する。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、加熱によって接着剤片Ta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、接着剤片Taが硬化して接着剤片Tcとなる。この工程を経て、基板10上にドルメン構造が構築される(図8参照)。チップT1が接着剤片付きチップT2aと離間していることで、ワイヤwの上部がチップT2に接することによるワイヤwのショートを防ぐことができる。また、チップT2と接する接着剤片Taにワイヤを埋め込む必要性がないため、接着剤片Taを薄くできるという利点がある。
(H)工程は、チップT1とチップT2との隙間等を封止材50で封止する工程である。この工程を経て図1に示す半導体装置100が完成する。
支持片形成用フィルムDを構成する熱硬化性樹脂組成物は、上述のとおり、エポキシ樹脂と、硬化剤と、エラストマとを含み、必要に応じて、無機フィラー及び硬化促進剤等を更に含む。本発明者らの検討によると、支持片Da及び硬化後の支持片Dcは以下の特性を有することが好ましい。
・特性1:基板10の所定の位置に支持片Daを熱圧着したとき位置ずれが生じにくいこと(120℃における支持片Daの溶融粘度が、例えば、4300~50000Pa・s又は5000~40000Pa・sであること)
・特性2:半導体装置100内において支持片Dcが応力緩和性を発揮すること(熱硬化性樹脂組成物がエラストマ(ゴム成分)を含むこと)
・特性3:接着剤片付きチップの接着剤片Tcとの接着強度が十分に高いこと(接着剤片Tcに対する支持片Dcのダイシェア強度が、例えば、2.0~7.0Mpa又は3.0~6.0Mpaであること)
・特性4:硬化に伴う収縮率が十分に小さいこと
・特性5:ピックアップ工程においてカメラによる支持片Daの視認性が良いこと(熱硬化性樹脂組成物が、例えば、着色料を含んでいること)
・特性6:支持片Dcが十分な機械的強度を有すること
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ない。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型エポキシ樹脂等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、クレゾールノボラック型エポキシ樹脂等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。これらは一種を単独で使用してもよいし、二種以上を併用してもよい。
硬化剤として、例えば、フェノール樹脂、エステル化合物、芳香族アミン、脂肪族アミン及び酸無水物が挙げられる。これらのうち、高いダイシェア強度を達成する観点から、フェノール樹脂が好ましい。フェノール樹脂の市販品として、例えば、DIC(株)製のLF-4871(商品名、BPAノボラック型フェノール樹脂)、エア・ウォーター(株)製のHE-100C-30(商品名、フェニルアラキル型フェノール樹脂)、DIC(株)製のフェノライトKA及びTDシリーズ、三井化学(株)製のミレックスXLC-シリーズとXLシリーズ(例えば、ミレックスXLC-LL)、エア・ウォーター(株)製のHEシリーズ(例えば、HE100C-30)、明和化成(株)製のMEHC-7800シリーズ(例えばMEHC-7800-4S)、JEFケミカル(株)のJDPPシリーズが挙げられる。これらは一種を単独で使用してもよいし、二種以上を併用してもよい。
エラストマとして、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、ポリブタジエン、アクリロニトリル、エポキシ変性ポリブタジエン、無水マレイン酸変性ポリブタジエン、フェノール変性ポリブタジエン及びカルボキシ変性アクリロニトリルが挙げられる。
無機フィラーとして、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、窒化ホウ素及び結晶性シリカ、非晶性シリカが挙げられる。これらは一種を単独で使用してもよいし、二種以上を併用してもよい。
硬化促進剤として、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、及び第四級アンモニウム塩が挙げられる。高いダイシェア強度を達成する観点から、イミダゾール系の化合物が好ましい。イミダゾール類としては、2-メチルイミダゾール、1-ベンジル-2-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-シアノエチルー2-メチルイミダゾール等が挙げられる。これらは一種を単独で使用してもよいし、二種以上を併用してもよい。
図9は第二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。第一実施形態に係る半導体装置100はチップT1が接着剤片Tcと離間している態様であったのに対し、本実施形態に係る半導体装置200はチップT1が接着剤片Tcと接している。つまり、接着剤片Tcは、チップT1の上面及び支持片Dcの上面に接している。例えば、支持片形成用フィルムDの厚さを適宜設定することで、チップT1の上面の位置と支持片Dcの上面の位置を一致させることができる。
・基材フィルム1と、粘着層2と、熱硬化性樹脂層5とをこの順序で備える積層フィルムを準備する工程
・上記積層フィルムの表面に熱硬化性樹脂層5よりも高い剛性を有する樹脂層6又は金属層を貼り合わせる工程
以下の材料を使用して支持片形成用フィルムのためのワニスAを調製した。
・エポキシ樹脂1:YDCN-700-10:(商品名、新日鉄住金化学(株)製、クレゾールノボラック型エポキシ樹脂、25℃において固体)5.4質量部
・エポキシ樹脂2:YDF-8170C:(商品名、新日鉄住金化学(株)製、液状ビスフェノールF型エポキシ樹脂、25℃において液状)16.2質量部
・フェノール樹脂(硬化剤):LF-4871:(商品名、DIC(株)製、BPAノボラック型フェノール樹脂)13.3質量部
・無機フィラー:SC2050-HLG:(商品名、(株)アドマテックス製、シリカフィラー分散液、平均粒径0.50μm)49.8質量部
・エラストマ:SG-P3溶剤変更品(商品名、ナガセケムテックス(株)製、アクリルゴム、重量平均分子量:80万、Tg:12℃、溶剤はシクロヘキサノン)14.9質量部
・カップリング剤1:A-189:(商品名、GE東芝(株)製、γ-メルカプトプロピルトリメトキシシラン)0.1質量部
・カップリング剤2:A-1160:(商品名、GE東芝(株)製、γ-ウレイドプロピルトリエトキシシラン)0.3質量部
・硬化促進剤:キュアゾール2PZ-CN:(商品名、四国化成工業(株)製、1-シアノエチル-2-フェニルイミダゾール)0.05質量部
・溶媒:シクロヘキサン
以下の材料を使用して支持片形成用フィルムのためのワニスBを調製した。
・エポキシ樹脂:YDCN-700-10:(商品名、新日鉄住金化学(株)製、クレゾールノボラック型エポキシ樹脂、25℃において固体)13.2質量部
・フェノール樹脂(硬化剤):HE-100C-30:(商品名、エア・ウォーター(株)製、フェニルアラキル型フェノール樹脂)11.0質量部
・無機フィラー:アエロジルR972:(商品名、日本アエロジル(株)製、シリカ、平均粒径0.016μm)7.8質量部
・エラストマ:SG-P3溶剤変更品(商品名、ナガセケムテックス(株)製、アクリルゴム、重量平均分子量:80万、Tg:12℃、溶剤はシクロヘキサノン)66.4質量部
・カップリング剤1:A-189:(商品名、GE東芝(株)製、γ-メルカプトプロピルトリメトキシシラン)0.4質量部
・カップリング剤2:A-1160:(商品名、GE東芝(株)製、γ-ウレイドプロピルトリエトキシシラン)1.15質量部
・硬化促進剤:キュアゾール2PZ-CN:(商品名、四国化成工業(株)製、1-シアノエチル-2-フェニルイミダゾール)0.03質量部
・溶媒:シクロヘキサン
上記のとおり、溶媒としてシクロヘキサノンを使用し、ワニスAの固形分割合が40質量%となるように調整した。100メッシュのフィルターでワニスAをろ過するとともに真空脱泡した。ワニスAを塗布するフィルムとして、離型処理が施されたポリエチレンテレフタレート(PET)フィルム(厚さ38μm)を準備した。真空脱泡後のワニスAを、PETフィルムの離型処理が施された面上に塗布した。塗布したワニスAを、90℃で5分間、続いて140℃で5分間の二段階で加熱乾燥した。こうして、Bステージ状態(半硬化状態)の熱硬化性樹脂層AをPETフィルムの表面上に作製した。
熱硬化性樹脂層Aを110℃で1時間にわたって加熱した後、130℃で3時間にわたって加熱する代わりに、110℃で2時間にわたって加熱することによ って硬化させたことの他は実施例1と同様にして、支持片形成用フィルムと、ダイシングテープとの積層体を得た。
ワニスAの代わりにワニスBを使用してPETフィルムの表面上に熱硬化性樹脂層Bを形成するとともに、70℃のホットプレート上において、ダイシングテープの粘着層に熱硬化性樹脂層Bをゴムロールで貼り合わせた後、熱硬化性樹脂層Bにポリイミドフィルム(厚さ25μm)をゴムロールで貼り合わせた。この工程を経て支持片形成用フィルムと、ダイシングテープとの積層体を得た。
(1)剥離強度
実施例1~3に係る支持片形成用フィルムを含む積層体を幅25mm、長さ100mmの長さにそれぞれカットして試験片を作製した。その後、ハロゲンランンプにて80mW/cm2、200mJ/cm2の条件でダイシングテープ側から紫外線を照射した。紫外線照射の粘着層と支持片形成用フィルムとの界面の剥離強度(剥離角度:180°、剥離速度:300mm/分)を測定した。各実施例につき、測定を3回ずつ行い、その平均値を以下に示す。
・実施例1…0.03N/25mm
・実施例2…0.04N/25mm
・実施例3…0.05N/25mm
実施例1~3に係る支持片形成用フィルム(形状:直径320mmの円形)と、上記と同様にして作製したダイシングテープ(形状:直径335mmの円形)の積層体を準備した。この積層体のダイシングテープにダイシングリングを70℃の条件でラミネートした。ダイサーを用いて支持片形成用フィルムをハイト55μmの条件で個片化した。これにより、サイズが10mm×10mmの支持片を得た。支持片の粘着層に向けてハロゲンランンプにて80mW/cm2、200mJ/cm2の条件でダイシングテープ側から紫外線照射した。その後、ダイボンダにてエキスパンド(エキスパンド量:3mm)した状態で、支持片をピックアップした。突き上げ治具として、三段突き上げステージを使用し、条件は突き上げ速度10mm/秒及び突き上げ高さ1200μmとした。各実施例について、6個の支持片に対してピックアップを試みたところ、実施例1~3のいずれにおいても、6個の支持片のすべてをピックアップすることができた。
Claims (12)
- 基板と、前記基板上に配置された第一のチップと、前記基板上であって前記第一のチップの周囲に配置された複数の支持片と、前記複数の支持片によって支持され且つ前記第一のチップを覆うように配置された第二のチップとを含むドルメン構造を有する半導体装置の製造方法であって、
(A)基材フィルムと、粘着層と、支持片形成用フィルムとをこの順序で備える積層フィルムを準備する工程と、
(B)前記支持片形成用フィルムを個片化することによって、前記粘着層の表面上に複数の支持片を形成する工程と、
(C)前記粘着層から前記支持片をピックアップする工程と、
(D)基板上に第一のチップを配置する工程と、
(E)前記基板上であって前記第一のチップの周囲又は前記第一のチップが配置されるべき領域の周囲に複数の前記支持片を配置する工程と、
(F)第二のチップと、前記第二のチップの一方の面上に設けられた接着剤片とを備える接着剤片付きチップを準備する工程と、
(G)複数の前記支持片の表面上に前記接着剤片付きチップを配置することによってドルメン構造を構築する工程と、
を含み、
前記支持片形成用フィルムが、熱硬化性樹脂層からなるフィルム又は熱硬化性樹脂層のうち少なくとも一部を硬化させた層からなるフィルム、あるいは、熱硬化性樹脂層と当該熱硬化性樹脂層よりも高い剛性を有する樹脂層又は金属層とを有する多層フィルムである、半導体装置の製造方法。 - 前記粘着層が紫外線硬化型であり、
(B)工程と(C)工程の間に、前記粘着層に紫外線を照射する工程を含む、請求項1に記載の半導体装置の製造方法。 - (G)工程よりも前に、前記支持片形成用フィルム又は前記支持片を加熱する工程を含む、請求項1又は2に記載の半導体装置の製造方法。
- 基板と、前記基板上に配置された第一のチップと、前記基板上であって前記第一のチップの周囲に配置された複数の支持片と、前記複数の支持片によって支持され且つ前記第一のチップを覆うように配置された第二のチップとを含むドルメン構造を有する半導体装置の製造プロセスにおいて使用される支持片形成用積層フィルムであって、
基材フィルムと、
粘着層と、
個片化されることによって複数の前記支持片となる支持片形成用フィルムと、
をこの順序で備え、
前記支持片形成用フィルムが、熱硬化性樹脂層からなるフィルム又は熱硬化性樹脂層のうち少なくとも一部を硬化させた層からなるフィルム、あるいは、熱硬化性樹脂層と当該熱硬化性樹脂層よりも高い剛性を有する樹脂層又は金属層とを有する多層フィルムである、支持片形成用積層フィルム。 - 前記支持片形成用フィルムの厚さが5~180μmである、請求項4に記載の支持片形成用積層フィルム。
- 前記粘着層が感圧型又は紫外線硬化型である、請求項4又は5に記載の支持片形成用積層フィルム。
- 前記熱硬化性樹脂層がエポキシ樹脂を含む、請求項4~6のいずれか一項に記載の支持片形成用積層フィルム。
- 前記熱硬化性樹脂層がエラストマを含む、請求項4~7のいずれか一項に記載の支持片形成用積層フィルム。
- 前記樹脂層がポリイミド層である、請求項4~8のいずれか一項に記載の支持片形成用積層フィルム。
- 前記金属層が銅層又はアルミニウム層である、請求項4~9のいずれか一項に記載の支持片形成用積層フィルム。
- 基板と、前記基板上に配置された第一のチップと、前記基板上であって前記第一のチップの周囲に配置された複数の支持片と、前記複数の支持片によって支持され且つ前記第一のチップを覆うように配置された第二のチップとを含むドルメン構造を有する半導体装置の製造プロセスにおいて使用される支持片形成用積層フィルムの製造方法であって、
基材フィルムと、その一方の面上に形成された粘着層とを有する粘着フィルムを準備する工程と、
前記粘着層の表面上に、個片化されることによって複数の前記支持片となる支持片形成用フィルムを積層する工程と、
を含み、
前記支持片形成用フィルムが、熱硬化性樹脂層からなるフィルム又は熱硬化性樹脂層のうち少なくとも一部を硬化させた層からなるフィルム、あるいは、熱硬化性樹脂層と当該熱硬化性樹脂層よりも高い剛性を有する樹脂層又は金属層とを有する多層フィルムである、支持片形成用積層フィルムの製造方法。 - 基板と、前記基板上に配置された第一のチップと、前記基板上であって前記第一のチップの周囲に配置された複数の支持片と、前記複数の支持片によって支持され且つ前記第一のチップを覆うように配置された第二のチップとを含むドルメン構造を有する半導体装置の製造プロセスにおいて使用される支持片形成用積層フィルムの製造方法であって、
基材フィルムと、粘着層と、熱硬化性樹脂層とをこの順序で備える積層フィルムを準備する工程と、
前記熱硬化性樹脂層の表面に当該熱硬化性樹脂層よりも高い剛性を有する樹脂層又は金属層を貼り合わせることによって支持片形成用フィルムを形成する工程と、
を含み、
前記支持片形成用フィルムは、前記熱硬化性樹脂層と、前記樹脂層又は前記金属層とを含み且つ個片化されることによって複数の前記支持片となる、支持片形成用積層フィルムの製造方法。
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JP2003124433A (ja) | 2001-08-27 | 2003-04-25 | Samsung Electronics Co Ltd | マルチチップパッケージ |
JP2006005333A (ja) | 2004-05-20 | 2006-01-05 | Toshiba Corp | 積層型電子部品とその製造方法 |
JP2010206136A (ja) | 2009-03-06 | 2010-09-16 | Disco Abrasive Syst Ltd | ワーク分割装置 |
JP2017515306A (ja) | 2014-04-29 | 2017-06-08 | マイクロン テクノロジー, インク. | 支持部材を有する積層半導体ダイアセンブリと、関連するシステムおよび方法 |
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WO2020218526A1 (ja) | 2020-10-29 |
KR20220002255A (ko) | 2022-01-06 |
CN113574665A (zh) | 2021-10-29 |
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