JP2015076434A - ウエーハの加工方法 - Google Patents
ウエーハの加工方法 Download PDFInfo
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Abstract
【解決手段】表面に複数の分割予定ラインにて格子状に区画された領域にデバイスが形成されたウエーハを、個々のデバイスに分割する加工方法であって、表面2aに保護部材3を貼着する工程と、裏面2bを研削して所定の厚みに形成する工程と、裏面側から透過性を有する波長のレーザー光線の集光点を分割予定ラインの内部に位置付けて照射し、改質層210を形成する工程と、裏面に絶縁機能を備えた補強シート6を装着するとともにダイシングテープTを貼着し環状のフレームFによって支持する工程と、ウエーハを加熱して補強シートを加熱することにより固化させる工程と、ウエーハに外力を付与し個々のデバイスに分割するとともに補強シートを個々のデバイスに沿って破断する工程とを含む。
【選択図】図7
Description
しかるに、デバイスを上下に積層して半導体装置を構成するデバイスが形成されたウエーハにおいては予めウエーハの裏面に絶縁性を有する補強シートが装着されており、この補強シートがレーザー光線を遮断するためウエーハの裏面側から内部加工を実施することができないという問題がある。
ウエーハの表面に保護部材を貼着する保護部材貼着工程と、
該保護部材貼着工程によって表面に保護部材が貼着されたウエーハの保護部材側を研削装置のチャックテーブルに保持し、ウエーハの裏面を研削して所定の厚みに形成する裏面研削工程と、
該裏面研削工程によって所定の厚みに形成されたウエーハの保護部材側をレーザー加工装置のチャックテーブルに保持し、ウエーハの裏面側からウエーハに対して透過性を有する波長のレーザー光線の集光点を分割予定ラインに対応する内部に位置付けて分割予定ラインに沿って照射し、ウエーハの内部に分割予定ラインに沿って改質層を形成する改質層形成工程と、
該改質層形成工程が実施されたウエーハの裏面に絶縁機能を備えた補強シートを装着するとともに補強シート側にダイシングテープを貼着し該ダイシングテープの外周部を環状のフレームによって支持するウエーハ支持工程と、
該ウエーハ支持工程が実施されたウエーハを加熱してウエーハの裏面に装着された補強シートを加熱することにより補強シートを固化させる補強シート加熱工程と、
ウエーハに外力を付与し、ウエーハを改質層が形成された分割予定ラインに沿って個々のデバイスに分割するとともに補強シートを個々のデバイスに沿って破断する分割工程と、を含む、
ことを特徴とするウエーハの加工方法が提供される。
上記ウエーハ支持工程は、絶縁機能を備えた補強シートが貼着されたダイシングテープを用いて実施する。
上記補強シート加熱工程を実施する前にウエーハの表面に貼着された保護部材を剥離する保護部材剥離工程を実施する。
上記分割工程を実施する前にウエーハの表面に貼着された保護部材を剥離する保護部材剥離工程を実施する。
この改質層形成工程は、先ず上述した図5に示すレーザー加工装置5のチャックテーブル51上に上記研削工程が実施された半導体ウエーハ2の保護テープ3側を載置する。そして、図示しない吸引手段によってチャックテーブル51上に半導体ウエーハ2を保護テープ3を介して吸着保持する(ウエーハ保持工程)。従って、チャックテーブル51上に保持された半導体ウエーハ2は、裏面2bが上側となる。このようにして、半導体ウエーハ2を吸引保持したチャックテーブル51は、図示しない加工送り手段によって撮像手段53の直下に位置付けられる。
波長 :1064nmのパルスレーザー
繰り返し周波数 :100kHz
平均出力 :0.3W
集光スポット径 :φ1μm
加工送り速度 :100mm/秒
図8に示す実施形態は、ダイシングテープTの表面に予め補強シート6が貼着された補強シート付きのダイシングテープを使用する。即ち、図8の(a)、(b)に示すように環状のフレームFの内側開口部を覆うように外周部が装着されたダイシングテープTの表面に貼着された補強シート6に、半導体ウエーハ2の裏面2bを装着する。このように補強シート付きのダイシングテープを使用する場合には、ダイシングテープTの表面に貼着された補強シート6に半導体ウエーハ2の裏面2bを装着することにより、補強シート6が装着された半導体ウエーハ2が環状のフレームFに装着されたダイシングテープTによって支持される。そして、図8の(b)に示すように半導体ウエーハ2の表面2aに貼着されている保護テープ3を剥離する(保護テープ剥離工程)。なお、図8の(a)、(b)に示す実施形態においては、環状のフレームFに外周部が装着されたダイシングテープTの表面に貼着された補強シート6に半導体ウエーハ2の裏面2bを装着する例を示したが、半導体ウエーハ2の裏面2bにダイシングテープTに貼着された補強シート6を装着するとともにダイシングテープTの外周部を環状のフレームFに同時に装着してもよい。
21:分割予定ライン
22:デバイス
210:改質層
3:保護テープ(保護部材)
4:研削装置
41:チャックテーブル
42:研削手段
424:研削ホイール
5:レーザー加工装置
51:チャックテーブル
52:レーザー光線照射手段
522:集光器
6:補強シート
7:加熱装置
71:処理ケース
74:ヒーター
8:テープ拡張装置
81:フレーム保持手段
82:テープ拡張手段
83:ピックアップコレット
F:環状のフレーム
T:ダイシングテープ
Claims (5)
- 表面に複数の分割予定ラインが格子状に形成されているとともに該複数の分割予定ラインによって区画された複数の領域にデバイスが形成されたウエーハを、分割予定ラインに沿って個々のデバイスに分割するウエーハの加工方法であって、
ウエーハの表面に保護部材を貼着する保護部材貼着工程と、
該保護部材貼着工程によって表面に保護部材が貼着されたウエーハの保護部材側を研削装置のチャックテーブルに保持し、ウエーハの裏面を研削して所定の厚みに形成する裏面研削工程と、
該裏面研削工程によって所定の厚みに形成されたウエーハの保護部材側をレーザー加工装置のチャックテーブルに保持し、ウエーハの裏面側からウエーハに対して透過性を有する波長のレーザー光線の集光点を分割予定ラインに対応する内部に位置付けて分割予定ラインに沿って照射し、ウエーハの内部に分割予定ラインに沿って改質層を形成する改質層形成工程と、
該改質層形成工程が実施されたウエーハの裏面に絶縁機能を備えた補強シートを装着するとともに補強シート側にダイシングテープを貼着し該ダイシングテープの外周部を環状のフレームによって支持するウエーハ支持工程と、
該ウエーハ支持工程が実施されたウエーハを加熱してウエーハの裏面に装着された補強シートを加熱することにより補強シートを固化させる補強シート加熱工程と、
ウエーハに外力を付与し、ウエーハを改質層が形成された分割予定ラインに沿って個々のデバイスに分割するとともに補強シートを個々のデバイスに沿って破断する分割工程と、を含む、
ことを特徴とするウエーハの加工方法。 - 該補強シート加熱工程を実施する前に該分割工程を実施し、該分割工程を実施した後に該補強シート加熱工程を実施する、請求項1記載のウエーハの加工方法。
- 該ウエーハ支持工程は、絶縁機能を備えた補強シートが貼着されたダイシングテープを用いて実施する、請求項1又は2記載のウエーハの加工方法。
- 該補強シート加熱工程を実施する前にウエーハの表面に貼着された保護部材を剥離する保護部材剥離工程を実施する、請求項1記載のウエーハの加工方法。
- 該分割工程を実施する前にウエーハの表面に貼着された保護部材を剥離する保護部材剥離工程を実施する、請求項2記載のウエーハの加工方法。
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