JP6597471B2 - 大面積の半導体素子搭載基材を封止する方法 - Google Patents
大面積の半導体素子搭載基材を封止する方法 Download PDFInfo
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- JP6597471B2 JP6597471B2 JP2016092558A JP2016092558A JP6597471B2 JP 6597471 B2 JP6597471 B2 JP 6597471B2 JP 2016092558 A JP2016092558 A JP 2016092558A JP 2016092558 A JP2016092558 A JP 2016092558A JP 6597471 B2 JP6597471 B2 JP 6597471B2
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- semiconductor element
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- epoxy resin
- element mounting
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- USFPINLPPFWTJW-UHFFFAOYSA-N tetraphenylphosphonium Chemical compound C1=CC=CC=C1[P+](C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 USFPINLPPFWTJW-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- TUQOTMZNTHZOKS-UHFFFAOYSA-N tributylphosphine Chemical compound CCCCP(CCCC)CCCC TUQOTMZNTHZOKS-UHFFFAOYSA-N 0.000 description 1
- IUURMAINMLIZMX-UHFFFAOYSA-N tris(2-nonylphenyl)phosphane Chemical compound CCCCCCCCCC1=CC=CC=C1P(C=1C(=CC=CC=1)CCCCCCCCC)C1=CC=CC=C1CCCCCCCCC IUURMAINMLIZMX-UHFFFAOYSA-N 0.000 description 1
- WXAZIUYTQHYBFW-UHFFFAOYSA-N tris(4-methylphenyl)phosphane Chemical compound C1=CC(C)=CC=C1P(C=1C=CC(C)=CC=1)C1=CC=C(C)C=C1 WXAZIUYTQHYBFW-UHFFFAOYSA-N 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 125000006839 xylylene group Chemical group 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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Description
[1]
(A)エポキシ樹脂、
(B)硬化剤、
(C)プレゲル化剤:(A)と(B)の合計100質量部に対して5〜30質量部 及び
(D)充填材:(A)〜(C)成分の合計100質量部に対して100〜2,500質量部
を含む硬化性エポキシ樹脂組成物を用いて、
半導体素子が搭載された200mm角以上の大きさである基板の半導体素子搭載面又は半導体素子が形成された直径200mmφ以上のウエハの半導体素子形成面を一括封止する半導体素子搭載基材封止工程を有する半導体素子搭載基材封止方法であって、
該半導体素子搭載基材封止工程における一括封止時の条件が、
(a)圧縮成型、
(b)成型温度:100〜175℃、
(c)成型時間:2〜20分 及び
(d)成型圧力:50〜350kN、
であることを特徴とする半導体素子搭載基材封止方法。
半導体素子搭載基材封止工程において、更に次の条件
(e)硬化温度:100〜250℃ 及び
(f)硬化時間:0.5〜10時間
でポストキュアーを行う、[1]記載の半導体素子搭載基材封止方法。
(B)硬化剤が酸無水物系硬化剤であり、その使用量が、(A)エポキシ樹脂中のエポキシ基1モルに対して該酸無水物系硬化剤中の酸無水物基のモル比が0.5〜1.5になる量である[1]又は[2]記載の半導体素子搭載基材封止方法。
(B)硬化剤がフェノール系硬化剤であり、その使用量が、前記(A)エポキシ樹脂中のエポキシ基1モルに対して該フェノール系硬化剤中のフェノール性水酸基のモル比が0.5〜2.0になる量である[1]又は[2]記載の半導体素子搭載基材封止方法。
(C)プレゲル化剤の成分が熱可塑性樹脂である[1]〜[4]いずれか1項に記載の半導体素子搭載基材封止方法。
本発明に用いる半導体素子封止用樹脂組成物は、次の
(A)エポキシ樹脂、
(B)硬化剤、
(C)プレゲル化剤 及び
(D)充填材
を含む硬化性エポキシ樹脂組成物である。
以下、各成分について詳述する。
本発明に用いられる(A)成分のエポキシ樹脂は、半導体素子封止用樹脂組成物の主成分であり、公知のエポキシ樹脂を用いることができる。(A)成分のエポキシ樹脂としては、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、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、トリフェノールアルカン型エポキシ樹脂、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、ジシクロペンタジエン型エポキシ樹脂、脂環式エポキシ樹脂、多官能フェノール類及び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並びにこれらにリン化合物を導入したリン含有エポキシ樹脂等が挙げられる。中でも、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、脂環式エポキシ樹脂、多官能フェノール類ジグリシジルエーテル化合物が好ましく用いられる。これらは1種単独で又は2種以上を併用して用いることができる。
本発明に用いられる半導体素子封止用樹脂組成物中、(B)成分の硬化剤は、(A)成分のエポキシ樹脂と反応する硬化剤であれば特に限定されるものではない。この硬化剤は、該硬化剤の分子中の反応性官能基(アミノ基、フェノール性水酸基、酸無水物基等)と、(A)成分のエポキシ樹脂中のエポキシ基とを反応させ、三次元架橋構造を形成した硬化物を得るために添加される。
本発明に用いられる(C)成分のプレゲル化剤は、加熱によりエポキシ樹脂が低粘度化することによる、フローマークの発生や硬化収縮起因の成型体のソリなどを抑制する。前記プレゲル化剤は、組成物調製時に分散しやすい粉体であることが好ましく、また、低温域で容易に溶解し、エポキシ樹脂、必要により使用される硬化剤、充填材、その他の添加剤との相溶性がよいことが好ましい。
本発明に用いられる(D)成分の充填材は、半導体素子封止用樹脂組成物の熱膨張率低下や耐湿信頼性向上のために添加される。該充填材としては、例えば、溶融シリカ、結晶性シリカ、クリストバライト等のシリカ類、アルミナ、窒化珪素、窒化アルミニウム、ボロンナイトライド、酸化チタン、ガラス繊維、酸化マグネシウム等が挙げられる。これらの充填材の平均粒径や形状は、用途に応じて選択することができる。なかでも球状アルミナ、球状溶融シリカ、ガラス繊維等が好ましい。
本発明の半導体素子封止用樹脂組成物は、上記(A)、(B)、(C)、及び(D)成分の所定量を配合することによって得られるが、(E)成分としてその他の添加剤を必要に応じて本発明の目的、効果を損なわない範囲で添加することができる。かかる添加剤としては、硬化促進剤、重合開始剤、離型剤、難燃剤、イオントラップ剤、酸化防止剤、接着付与剤、低応力剤、着色剤、カップリング剤等が挙げられる。
本発明の半導体素子封止用樹脂組成物は、例えば、以下に記載されるような方法で製造することができる。
本工程は、上記半導体素子封止用樹脂組成物で、大面積の半導体素子搭載基材を一括封止する工程である。
即ち、上記半導体素子封止用樹脂組成物を所定の厚みになるよう計量し、大面積を有するウエハ又は有機基板に搭載された積層半導体素子上に充填する。その基材を圧縮成型可能なモールド装置等を用いて、下記の成型条件である成型温度、成型時間及び成型圧力で封止する。封止後、半導体素子封止用樹脂組成物を更に硬化させるために、必要により所定の硬化温度及び硬化時間でポストキュアーを行う。
封止樹脂の厚さは、半導体素子により適宜決定すればよいが、50〜3,000μmが好ましく、特に100〜2,000μmが好ましい。また、使用する基材としてシリコンウエハを用いる場合の厚さとしては、成型時に割れやかけ等が生じない厚みであればよく、好ましくは10〜1,000μmであり、さらに好ましくは20〜775μmである。
大面積のシリコンウエハとは、本発明では直径200mm以上のウエハを言う。実際には、200〜450mmのウエハが対象である。また、基材として基板を用いる場合には、基板の厚さが圧縮成型時にサポート機能を有する程度であればよく、好ましくは30μm〜5,000μmであり、さらに好ましくは50μm〜3,000μmである。また、基板の大きさについては、本発明では縦200mm以上、横200mm以上の四角形であれば「大面積の基板」であるとする。実際には、縦200〜650mm、横200〜650mmの基板が本発明の対象である。
基材の種類としては、セラミックス基板、表面が絶縁処理された銅やアルミ基板、BT(ビスマレイミドトリアジン)樹脂基板、FRP(繊維強化プラスチック)基板などが挙げられ、特にはBT樹脂基板やセラミックス基板が好ましく用いられる。
圧縮成型時の成型条件は、成型温度が100〜175℃、好ましくは120〜175℃、成型時間が2〜20分、好ましくは3〜10分、成型圧力が50〜350kN、好ましくは150〜350kNである。
上記条件で封止された基材は、半導体素子封止用樹脂組成物を更に硬化させるために、温度100〜250℃、好ましくは150〜250℃で、時間0.5〜10時間、好ましくは1〜5時間で硬化させることが好ましい。
調製例1〜12及び比較調製例1〜4について下記に示す各成分を表1に示す組成比で配合して半導体素子封止用樹脂組成物を調製した。なお、表1において、(A)〜(E)成分の量は質量部を示す。
(A1)ビスフェノールF型エポキシ樹脂(品名:YDF−8170:三菱化学社製)
(A2)3官能型エポキシ樹脂(品名:EP630:三菱化学社製)
(A3)脂環式エポキシ樹脂(品名:CEL2021P:ダイセル社製)
(B)硬化剤
(B1)アリルフェノール型フェノール樹脂(品名:MEH−8000H:明和化成社製)
(B2)酸無水物硬化剤(品名:リカシッドMH:新日本理化社製)
(C)プレゲル化剤
(C1)平均粒径2.0μmエポキシ基変性アクリル樹脂(品名:F−301:アイカ工業社製)
(C2)平均粒径2.0μmアクリル樹脂(品名:F−320:アイカ工業社製)
(D)充填材
(D1)平均粒径8μmの球状シリカ(龍森社製)
(D2)平均粒径13μmの球状シリカ(品名:CS−6103 53C、龍森社製)
(E)その他の成分
(E1)マイクロカプセル型潜在性硬化促進剤(品名:ノバキュアHX3088:旭化成イーマテリアルズ株式会社製)
(E2)顔料(品名:三菱カーボン3230MJ:三菱化学社製)
実施例1〜10では、ウエハ8インチ/725μm厚を使用し、実施例11及び12では290mm×290mmのBT(ビスマレイミドトリアジン)樹脂製の有機基板/厚さ700μmを使用した。実施例1〜12では、半導体素子封止用樹脂組成物として、それぞれ調製例1〜12の組成物を用いて、アピックヤマダ社製ウエハーモールド装置(MZ824−1)にて樹脂厚みを100μmに設定し、成型圧力350kN、成型時間600秒、成型温度120℃にて圧縮成型した。その後、各半導体素子封止用樹脂組成物を硬化温度150℃、硬化時間4時間にて完全硬化(ポストキュアー)させた。
比較例1〜4では、ウエハ8インチ/725μm厚を使用し、半導体素子封止用樹脂組成物として、それぞれ比較調製例1〜4の組成物を用いて、実施例1〜12と同様の条件で圧縮成型及びポストキュアーを行った。
実施例13〜17ではウエハ8インチ/725μm厚を使用し、実施例18では290mm×290mmのBT(ビスマレイミドトリアジン)樹脂製の有機基板/厚さ700μmを使用した。実施例13〜18では、半導体素子封止用樹脂組成物として調製例2の組成物を用いて、アピックヤマダ社製ウエハーモールド装置(MZ824−1)にて樹脂厚みを100μmに設定し、表2に示す成型条件で成型した。その後、各半導体素子封止用樹脂組成物を表2示すポストキュアー条件で硬化させて実施例13〜18を得た。
比較例5、7〜9ではウエハ8インチ/725μm厚を使用し、比較例6では290mm×290mmのBT(ビスマレイミドトリアジン)樹脂製の有機基板/厚さ700μmを使用した。比較例5〜9では、半導体素子封止用樹脂組成物として調製例2の組成物を用いて、アピックヤマダ社製ウエハーモールド装置(MZ824−1)にて樹脂厚みを100μmに設定し、表2に示す成型条件で成型した。その後、各半導体素子封止用樹脂組成物を表2示すポストキュアー条件で硬化させて比較例5〜9を得た。
(1)粘度
JIS Z8803:2011記載の方法に準じ、25℃の測定温度で、E型粘度計を用いて、2分後の値を測定した。
(2)フローマーク、未充填、反り測定
作製した成形物に対して外観目視により、フローマーク、未充填の有無及び反りを確認した。
(3)反り測定
反りの測定方法としては、室温(25℃)にて成型物を水平な場所に置き、成型物の高さ方向の変位を測定し、最も変位差の大きい数値を読み取ることによって求めた。
Claims (5)
- (A)エポキシ樹脂、
(B)硬化剤、
(C)プレゲル化剤:(A)と(B)の合計100質量部に対して5〜30質量部 及び
(D)充填材:(A)〜(C)成分の合計100質量部に対して100〜2,500質量部
を含む硬化性エポキシ樹脂組成物を用いて、
半導体素子が搭載された200mm角以上の大きさである基板の半導体素子搭載面又は半導体素子が形成された直径200mmφ以上のウエハの半導体素子形成面を一括封止する半導体素子搭載基材封止工程を有する半導体素子搭載基材封止方法であって、
該半導体素子搭載基材封止工程における一括封止時の条件が、
(a)圧縮成型、
(b)成型温度:100〜175℃、
(c)成型時間:2〜20分 及び
(d)成型圧力:150〜350kN、
であることを特徴とする半導体素子搭載基材封止方法。 - 半導体素子搭載基材封止工程において、更に次の条件
(e)硬化温度:100〜250℃ 及び
(f)硬化時間:0.5〜10時間
でポストキュアーを行う、請求項1記載の半導体素子搭載基材封止方法。 - (B)硬化剤が酸無水物系硬化剤であり、その使用量が、(A)エポキシ樹脂中のエポキシ基1モルに対して該酸無水物系硬化剤中の酸無水物基のモル比が0.5〜1.5になる量である請求項1又は2記載の半導体素子搭載基材封止方法。
- (B)硬化剤がフェノール系硬化剤であり、その使用量が、前記(A)エポキシ樹脂中のエポキシ基1モルに対して該フェノール系硬化剤中のフェノール性水酸基のモル比が0.5〜2.0になる量である請求項1又は2記載の半導体素子搭載基材封止方法。
- (C)プレゲル化剤の成分が熱可塑性樹脂である請求項1〜4いずれか1項に記載の半導体素子搭載基材封止方法。
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