JP2014192339A - 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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- JP2014192339A JP2014192339A JP2013066524A JP2013066524A JP2014192339A JP 2014192339 A JP2014192339 A JP 2014192339A JP 2013066524 A JP2013066524 A JP 2013066524A JP 2013066524 A JP2013066524 A JP 2013066524A JP 2014192339 A JP2014192339 A JP 2014192339A
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- 238000003672 processing method Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims description 21
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- 230000015572 biosynthetic process Effects 0.000 abstract description 10
- 230000005494 condensation Effects 0.000 abstract 3
- 238000009833 condensation Methods 0.000 abstract 3
- 239000004065 semiconductor Substances 0.000 description 57
- 230000001681 protective effect Effects 0.000 description 12
- 230000003287 optical effect Effects 0.000 description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229910009372 YVO4 Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 230000011218 segmentation Effects 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
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Abstract
【解決手段】ウエーハ2に対して透過性を有する波長のレーザー光線をウエーハの裏面側から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、ウエーハに外力を付与することにより、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分割工程とを含み、改質層形成工程は、レーザー光線の集光点をウエーハの裏面近傍に位置付けて第1の改質層210を形成する第1改質層形成工程と、ウエーハにおける第1の改質層から離れた表面側にレーザー光線の集光点を位置付けて照射し、その後、順次該第1の改質層に至る領域に集光点を移動させながら複数の第2の改質層220を積層して形成する第2改質層形成工程とを含んでいる。
【選択図】図5
Description
また、改質層を複数積層して形成する場合は、レーザー光線の集光点を最初に表面近傍に位置付けて照射し、その後、順次裏面側に集光点を移動させながら改質層を積層している。(例えば、特許文献2参照。)
このように、ウエーハの表面側から順次裏面側に集光点を移動させながら改質層を積層して形成するのは、最初に裏面近傍に改質層を形成するとレーザー光線の集光点を表面側に近づける際に、既に形成された改質層がレーザー光線の照射を妨げるとの考えからである。
ウエーハに対して透過性を有する波長のレーザー光線をウエーハの裏面側から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に外力を付与することにより、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分割工程と、を含み、
該改質層形成工程は、レーザー光線の集光点をウエーハの裏面近傍に位置付けて照射することによりウエーハの裏面近傍に第1の改質層を形成する第1改質層形成工程と、
該第1改質層形成工程が実施されたウエーハにおける該第1の改質層から離れた表面側にレーザー光線の集光点を位置付けて照射し、その後、順次該第1の改質層に至る領域に集光点を移動させながら複数の第2の改質層を積層して形成する第2改質層形成工程と、を含んでいる、
ことを特徴とするウエーハの加工方法が提供される。
この改質層形成工程においては、先ずレーザー光線の集光点を半導体ウエーハ2の裏面近傍に位置付けて照射することにより半導体ウエーハ2の裏面近傍に第1の改質層を形成する第1改質層形成工程を実施する。この第1改質層形成工程を実施するには、上記図3に示すレーザー加工装置4のチャックテーブル41上に半導体ウエーハ2の表面2aに貼着された保護テープ3側を載置する。そして、図示しない吸引手段を作動することにより、チャックテーブル41上に半導体ウエーハ2を吸引保持する(ウエーハ保持工程)。従って、チャックテーブル41上に保護テープ3を介して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41は、図示しない加工送り手段によって撮像手段43の直下に位置付けられる。
光源 :LD励起QスイッチNd:YVO4レーザー
波長 :1064nmのパルスレーザー
繰り返し周波数 :1MHz
平均出力 :0.7W
集光スポット径 :φ1μm
加工送り速度 :700mm/秒
第2改質層形成工程は、図5の(a)で示すようにチャックテーブル41をレーザー光線を照射するレーザー光線照射手段42の集光器422が位置するレーザー光線照射領域に移動し、所定の分割予定ライン21の一端(図5の(a)において左端)をレーザー光線照射手段42の集光器422の直下に位置付ける。次に、集光器422から照射されるパルスレーザー光線の集光点Pを半導体ウエーハ2における第1の改質層210から離れた表面2a側に位置付ける。このとき、図示の実施形態においてはパルスレーザー光線の集光点Pを表面2aから例えば60μm裏面2b側の位置に位置付ける。そして、集光器422からシリコンウエーハに対して透過性を有する波長のパルスレーザー光線を照射しつつチャックテーブル41を図5の(a)において矢印X1で示す方向に所定の送り速度で移動せしめる。そして、図5の(b)で示すようにレーザー光線照射手段42の集光器422の照射位置が分割予定ライン21の他端の位置に達したら、パルスレーザー光線の照射を停止するとともにチャックテーブル41の移動を停止する。この結果、図5の(c)で示すように半導体ウエーハ2の表面2aから例えば60μm裏面2b側の位置を中心として分割予定ライン21に沿って第2の改質層220が形成される(第2改質層形成工程)。
光源 :LD励起QスイッチNd:YVO4レーザー
波長 :1064nmのパルスレーザー
繰り返し周波数 :1MHz
平均出力 :0.5W
集光スポット径 :φ1μm
加工送り速度 :700mm/秒
第3改質層形成工程は、図7の(a)で示すようにチャックテーブル41をレーザー光線を照射するレーザー光線照射手段42の集光器422が位置するレーザー光線照射領域に移動し、所定の分割予定ライン21の一端(図7の(a)において左端)をレーザー光線照射手段42の集光器422の直下に位置付ける。次に、集光器422から照射されるパルスレーザー光線の集光点Pを半導体ウエーハ2における第1の改質層210より表面2a側に位置付ける。このとき、図示の実施形態においてはパルスレーザー光線の集光点Pを半導体ウエーハ2の表面2aから例えば20μm裏面2b側の位置に位置付ける。そして、集光器422からシリコンウエーハに対して透過性を有する波長のパルスレーザー光線を照射しつつチャックテーブル41を図7の(a)において矢印X1で示す方向に所定の送り速度で移動せしめる。そして、図7の(b)で示すようにレーザー光線照射手段42の集光器422の照射位置が分割予定ライン21の他端の位置に達したら、パルスレーザー光線の照射を停止するとともにチャックテーブル41の移動を停止する。この結果、図7の(c)で示すように半導体ウエーハ2の表面2aから例えば20μm裏面2b側の位置を中心として分割予定ライン21に沿って第3の改質層230が形成される(第3改質層形成工程)。
なお、上記第3改質層形成工程における加工条件は、図示の実施形態においては上記第2改質層形成工程の加工条件を同一に設定されている。
このように半導体ウエーハ2の表面2a近傍に第3の改質層230を形成することにより、後述する分割工程におけるウエーハの分割が円滑に行われる。
21:分割予定ライン
22:デバイス
210:第1の改質層
220:第2の改質層
230:第3の改質層
3:保護テープ
4:レーザー加工装置
41:レーザー加工装置のチャックテーブル
42:レーザー光線照射手段
422:集光器
5:分割装置
51:フレーム保持手段
52:テープ拡張手段
53: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 (2)
- 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、
ウエーハに対して透過性を有する波長のレーザー光線をウエーハの裏面側から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に外力を付与することにより、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分割工程と、を含み、
該改質層形成工程は、レーザー光線の集光点をウエーハの裏面近傍に位置付けて照射することによりウエーハの裏面近傍に第1の改質層を形成する第1改質層形成工程と、
該第1改質層形成工程が実施されたウエーハにおける該第1の改質層から離れた表面側にレーザー光線の集光点を位置付けて照射し、その後、順次該第1の改質層に至る領域に集光点を移動させながら複数の第2の改質層を積層して形成する第2改質層形成工程と、を含んでいる、
ことを特徴とするウエーハの加工方法。 - 該第2改質層形成工程を実施した後に、該第2の改質層よりウエーハの表面側にレーザー光線の集光点を位置付けて照射することによりウエーハの表面近傍に第3の改質層を形成する第3改質層形成工程を実施する、請求項1記載のウエーハの加工方法。
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