JP7382342B2 - 半導体パッケージの製造方法 - Google Patents
半導体パッケージの製造方法 Download PDFInfo
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- JP7382342B2 JP7382342B2 JP2020558285A JP2020558285A JP7382342B2 JP 7382342 B2 JP7382342 B2 JP 7382342B2 JP 2020558285 A JP2020558285 A JP 2020558285A JP 2020558285 A JP2020558285 A JP 2020558285A JP 7382342 B2 JP7382342 B2 JP 7382342B2
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Description
(a)基材シートと、該基材シートの少なくとも一方の面に間欠パターンで設けられた可溶性粘着層を備えた、粘着シートを用意する工程と、
(b)第1支持基板上に再配線層を備えた第1積層体を作製する工程と、
(c)前記粘着シートを用いて、前記第1積層体の前記再配線層側の表面に、第2支持基板が前記可溶性粘着層を介して結合された第2積層体を得る工程と、
(d)前記第2積層体から前記第1支持基板を剥離して、前記再配線層の前記第2支持基板から離れた側の表面が露出した第3積層体を得る工程と、
(e)前記第3積層体の前記再配線層側の表面に半導体チップを実装し、かつ、前記半導体チップを樹脂封止して、上端面、下端面、右端面及び左端面からなる外周端面を備えた第4積層体を得る工程と、
(f)前記第4積層体の前記右端面及び前記左端面を1対の封止部材で封止し、前記第4積層体を前記下端面が下にかつ前記上端面が上になるような角度で、前記下端面を溶液に選択的に浸漬させる工程と、
(g)前記第4積層体の前記第2支持基板及び前記再配線層間の内部空間と、前記溶液との間に圧力差を与えて、該圧力差により前記溶液を前記内部空間内に浸透させ、それにより前記可溶性粘着層を溶解又は軟化させる工程と、
(h)前記可溶性粘着層が溶解又は軟化された状態で、前記第4積層体から前記第2支持基板を剥離して半導体パッケージを得る工程と、
を含む、方法が提供される。
図3A及び図3Bに示されるように、基材シート15と、基材シート15の少なくとも一方の面に間欠パターンで設けられた可溶性粘着層16とを備えた、粘着シート17を用意する。粘着シート17の詳細については後述するものとする。なお、粘着シートには、粘着層を介して基材シート自体を被着体に接着させるために用いられる「接着型粘着シート」と、粘着層を被着体又は第二の基材シートに転写させて当初の基材シートを剥離することで、被着体又は第二の基材シートに粘着性を付与するために用いられる「転写型粘着シート」の2つのタイプが存在する。この点、本発明で用意する粘着シート17は接着型粘着シート及び転写型粘着シートのいずれであってもよい。
図1A(i)に示されるように、第1支持基板10上に再配線層12を備えた第1積層体14を作製する。第1支持基板10は再配線層12を形成するためのベースとなるものである。第1支持基板10は、いわゆるキャリア付金属箔の形態であってもよく、公知の層構成が採用可能である。第1支持基板10は、基材、剥離層及び金属層を順に備えるものであってもよく、例えば特許文献3(国際公開第2018/097265号)に開示される積層シートを好ましく用いることができる(この積層シートの基材は樹脂フィルム、ガラス又はセラミックスで構成されうる)。この場合、再配線層12が第1支持基板10の金属層表面に作製されるのが好ましい。
図1A(ii)に示されるように、粘着シート17を用いて、第1積層体14の再配線層12側の表面に、第2支持基板18が可溶性粘着層16を介して結合された第2積層体20を得る。例えば、第1積層体14の再配線層12側の表面に粘着シート17を用いて第2支持基板18を貼り付けることにより、第2積層体20を得ることができる。こうすることで、再配線層12は第2支持基板18によって大きく湾曲されないように補強されることができる。すなわち、第2支持基板18が補強シートとして機能するため、再配線層12の表面及び/又は内部の配線層の断線や剥離を回避して、再配線層12の接続信頼性を向上することができる。また、湾曲が効果的に防止ないし抑制されることで、再配線層12表面の平坦性(コプラナリティ)を向上することができる。
図1A(iii)に示されるように、第2積層体20から第1支持基板10を剥離して、再配線層12の第2支持基板18から離れた側の表面が露出した第3積層体22を得る。こうすることで、例えば第1支持基板10を構成する基材及び剥離層等が再配線層12から剥離除去される。この剥離除去は物理的な剥離により行われるのが好ましい。物理的剥離法は、手や治工具、機械等で第1支持基板10を再配線層12から引き剥がすことにより分離する手法である。このとき、可溶性粘着層16を介して密着した第2支持基板18が再配線層12を補強していることで、再配線層12が局部的に大きく湾曲するのを防止することができる。すなわち、第2支持基板18は、第1支持基板10が剥離される間、引き剥がし力に抗すべく再配線層12を補強し、湾曲をより一層効果的に防止ないし抑制することができる。こうして湾曲により引き起こされることがある再配線層12の内部及び/又は表面の配線層の断線や剥離を回避して、再配線層12の接続信頼性を向上することができる。また、湾曲が効果的に防止ないし抑制されることで、再配線層12表面の平坦性(コプラナリティ)を向上することができる。なお、第1支持基板10が金属層を含む場合には、第1支持基板10の剥離後に第3積層体22の表面に残留しうる金属層をエッチングにより除去するのが好ましい。金属層のエッチングはフラッシュエッチング等の公知の手法に基づき行えばよい。
図1B(iv)に示されるように、第3積層体22の再配線層12側の表面に半導体チップ24を実装し、かつ、半導体チップ24を封止材26で樹脂封止して、上端面、下端面、右端面及び左端面からなる外周端面を備えた第4積層体28を得る。本発明の方法においては、再配線層12の表面に可溶性粘着層16を介して第2支持基板18を積層することで、半導体チップ24の実装に有利となる優れた表面平坦性(コプラナリティ)を再配線層12の第2支持基板18から離れた側の表面において実現することができる。すなわち、半導体チップ24の実装時においても、再配線層12は第2支持基板18によって局部的に大きく湾曲されずに済む。その結果、半導体チップ24の接続歩留まりを高くすることができる。なお、第4積層体28の各端面の長さはそれぞれ異なっていてもよい。例えば、第4積層体28が矩形状の場合、長辺側の両端面をそれぞれ上端面及び下端面と設定してもよく、短辺側の両端面をそれぞれ上端面及び下端面と設定してもよい。この点、後述する粘着層の溶解又は軟化工程において、第4積層体28の上端面に接続されたポンプを用いて吸引を行う場合には、吸引する面積を広げる観点から、長辺側の両端面をそれぞれ上端面及び下端面とするのが好ましい。
図1B(v)に示されるように、第4積層体28の一部を、可溶性粘着層16を溶解可能な溶液(すなわち溶解液)に浸漬させる。この操作は、図2A及び図2Bに示されるように、第4積層体28の右端面及び左端面を1対の封止部材36で封止し、第4積層体28を下端面が下にかつ上端面が上になるような角度で、下端面を溶液Lに選択的に浸漬させることにより行う。こうすることで、後述する粘着層の溶解又は軟化工程において、溶液Lを第2支持基板18及び再配線層12間の内部空間(以下、単に「内部空間」と称することがある)内に浸透させた際に、溶液Lが第4積層体28の左右端面から漏れ出すことなく、下端面から上端面に向かって万遍なく行き渡る。その結果、可溶性粘着層16の溶解又は軟化を効率良く行うことが可能となる。さらに、本発明の方法では、第4積層体28の下端面を溶液Lに選択的に浸漬させるため、第4積層体28の全体を溶液Lに浸漬させる場合と比べて、溶液Lとの接触により半導体チップ24及び封止材26が受けるダメージが効果的に抑制される。この点、従来の方法では、デバイス等に悪影響を及ぼしにくいpH領域の溶解液を用いる等、使用可能な溶解液の種類が制限されていた。一方、本発明の方法では、上記態様とすることで半導体チップ24等に与えるダメージを抑制できるため、可溶性粘着層16をより効果的に溶解可能な性質を有する溶解液を柔軟に採用することが可能となる。
第4積層体28の下端面を溶液Lに浸漬させた状態で、第4積層体28の第2支持基板18及び再配線層12間の内部空間と、溶液Lとの間に圧力差を与えて、溶液Lを内部空間内に浸透させる。こうして可溶性粘着層16を溶解又は軟化させる。すなわち、第4積層体28の内部空間内を減圧する、及び/又は溶液Lを加圧することにより、第4積層体28の下端面付近に存在する溶液Lが、第4積層体28の上端面側に向かって内部空間内を上昇する。その結果、内部空間内が溶液Lで満たされ、内部空間内に存在する可溶性粘着層16と溶液Lとが接触することで、可溶性粘着層16が溶解又は軟化する。この点、可溶性粘着層16は間欠パターンで構成されているので、溶液Lが可溶性粘着層16の間欠パターンの隙間に効果的に浸透して、可溶性粘着層16の溶解又は軟化が促進される。このように、本発明の方法では、可溶性粘着層16が存在する内部空間と溶解液との間に圧力差を与えることで溶解液の浸透を強制的に行うため、積層体の全体を溶解液に浸漬させることで毛細管現象により溶解液を粘着層の隙間に徐々に浸透させる従来の方法と比べて、粘着層の溶解又は軟化を極めて短時間で行うことができる。
図1B(vi)に示されるように、可溶性粘着層16が溶解又は軟化された状態で、第4積層体28から第2支持基板18を剥離して、半導体パッケージ30を得る。第2支持基板18は可溶性粘着層16の溶解又は軟化に起因して極めて剥離しやすい状態となっているため、手や治工具、機械等で第2支持基板18を第4積層体28から軽く引き剥がすことにより極めて容易に分離することができる。なお、第2支持基板18は、可溶性粘着層16の溶解に起因して自然剥離した状態となっていてもよい。いずれにしても、本発明の方法によれば、再配線層12に与える応力を最小化しながら極めて短時間で第2支持基板18の剥離を行うことができる。こうして再配線層12に加わる応力が最小化されることで、再配線層12における配線の断線や実装部の断線を効果的に回避することができる。
図3A及び図3Bを参照しつつ上述したとおり、本発明の方法に用いられる粘着シート17は、基材シート15と、基材シート15の少なくとも一方の面に間欠パターンで設けられた可溶性粘着層16とを備える。可溶性粘着層16は基材シート15の両面に設けられてもよい。間欠パターンとは、可溶性粘着層16が間欠的(途切れ途切れ)に存在する形状を意味し、可溶性粘着層16が存在する粘着性領域16aと、可溶性粘着層16が存在しない非粘着性領域16b(例えば空間)とによって形成される。間欠パターンは島状又はストライプ状のパターンであるのが好ましく、より好ましくは島状のパターンである。島状のパターンとは、個々の粘着性領域16aが、その周りに存在する非粘着性領域16bによって取り囲まれた形状を意味する。島状のパターンを構成する個々の粘着性領域16aの具体的形状としては、多角形、円形等の様々な形状が挙げられ、星形多角形のような直線の輪郭線が入り組んだ多角形、曲線の輪郭線が入り組んだ異形状であってもよい。
Claims (19)
- 半導体パッケージの製造方法であって、
(a)基材シートと、該基材シートの少なくとも一方の面に間欠パターンで設けられた可溶性粘着層を備えた、粘着シートを用意する工程と、
(b)第1支持基板上に再配線層を備えた第1積層体を作製する工程と、
(c)前記粘着シートを用いて、前記第1積層体の前記再配線層側の表面に、第2支持基板が前記可溶性粘着層を介して結合された第2積層体を得る工程と、
(d)前記第2積層体から前記第1支持基板を剥離して、前記再配線層の前記第2支持基板から離れた側の表面が露出した第3積層体を得る工程と、
(e)前記第3積層体の前記再配線層側の表面に半導体チップを実装し、かつ、前記半導体チップを樹脂封止して、上端面、下端面、右端面及び左端面からなる外周端面を備えた第4積層体を得る工程と、
(f)前記第4積層体の前記右端面及び前記左端面を1対の封止部材で封止し、前記第4積層体を前記下端面が下にかつ前記上端面が上になるような角度で、前記下端面を溶液に選択的に浸漬させる工程と、
(g)前記第4積層体の前記第2支持基板及び前記再配線層間の内部空間と、前記溶液との間に圧力差を与えて、該圧力差により前記溶液を前記内部空間内に浸透させ、それにより前記可溶性粘着層を溶解又は軟化させる工程と、
(h)前記可溶性粘着層が溶解又は軟化された状態で、前記第4積層体から前記第2支持基板を剥離して半導体パッケージを得る工程と、
を含む、方法。 - 前記工程(f)において、前記第4積層体の前記下端面から上端面までの長さを100%として、下端面から長さ0%超90%以下の範囲内の下方領域のみを前記溶液に浸漬させる、請求項1に記載の方法。
- 前記工程(f)が、前記第4積層体の一面側を背面板に接触させて固定する工程を含む、請求項1又は請求項2に記載の方法。
- 前記工程(g)における前記圧力差が、5kPa以上である、請求項1から請求項3までのいずれか一項に記載の方法。
- 前記工程(g)における前記圧力差が、前記第4積層体の前記上端面に接続されたポンプを用いて前記内部空間を減圧することにより与えられる、請求項1から請求項4までのいずれか一項に記載の方法。
- 前記ポンプが、エジェクタポンプ、ロータリーポンプ、ダイヤフラムポンプ及びアスピレータポンプからなる群から選択される少なくとも1種である、請求項5に記載の方法。
- 前記工程(f)が、吸引冶具と前記背面板とで前記第4積層体を挟み込むことにより行われ、前記吸引冶具が、
正面板と、
前記正面板上に互いに平行に離間して設けられる、前記1対の封止部材と、
前記正面板上に前記1対の封止部材間に懸架して設けられる、第2の封止部材と、
前記正面板の上端及び/又は前記1対の封止部材の上端に接続され、前記正面板、前記1対の封止部材、前記第2の封止部材及び前記背面板と共に、減圧用密閉空間を形成可能な上部キャップと、
前記上部キャップに設けられる吸引口と、
を備えたものであり、前記吸引口に前記ポンプが接続される、請求項5又は請求項6に記載の方法。 - 前記封止部材が、ゴム製の部材、接着フィルム、エラストマーから選択される少なくとも1種である、請求項1から請求項7までのいずれか一項に記載の方法。
- 前記封止部材がゴム製の部材であり、前記ゴムが、EPDM、シリコーンゴム及びフッ素含有ゴムからなる群から選択される少なくとも1種である、請求項8に記載の方法。
- 前記封止部材の前記第4積層体と接触する面における、JIS B0601-2001に準拠して測定される最大高さRzが0.01μm以上500μm以下である、請求項1から請求項9までのいずれか一項に記載の方法。
- 前記背面板が耐アルカリ性を有する、請求項1から請求項10までのいずれか一項に記載の方法。
- 前記背面板が塩化ビニルで構成される、請求項11に記載の方法。
- 前記背面板の前記第4積層体と接触する面における、JIS B0601-2001に準拠して測定される最大高さRzが0.01μm以上500μm以下である、請求項1から請求項12までのいずれか一項に記載の方法。
- 前記可溶性粘着層が溶液可溶型樹脂を含む、請求項1から請求項13までのいずれか一項に記載の方法。
- 前記溶液可溶型樹脂がアルカリ可溶型樹脂である、請求項14に記載の方法。
- 前記間欠パターンが島状又はストライプ状のパターンである、請求項1から請求項15までのいずれか一項に記載の方法。
- 前記島状のパターンがドットパターンである、請求項16に記載の方法。
- 前記粘着シートが接着型粘着シートであり、前記工程(c)が、前記第1積層体の前記再配線層側の表面に前記粘着シートを貼り付けて、前記基材シート自体を前記第2支持基板として用いる工程を含む、請求項1から請求項17までのいずれか一項に記載の方法。
- 前記粘着シートが転写型粘着シートであり、前記工程(c)が、前記第1積層体と前記第2支持基板との結合に先立ち、前記第2支持基板、又は前記第1積層体に前記粘着シートを貼り付けて、前記可溶性粘着層を前記第2支持基板、又は前記第1積層体に転写するとともに、前記基材シートを剥離する工程を含む、請求項1から請求項18までのいずれか一項に記載の方法。
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