JP6472347B2 - ウエーハの薄化方法 - Google Patents
ウエーハの薄化方法 Download PDFInfo
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- JP6472347B2 JP6472347B2 JP2015144351A JP2015144351A JP6472347B2 JP 6472347 B2 JP6472347 B2 JP 6472347B2 JP 2015144351 A JP2015144351 A JP 2015144351A JP 2015144351 A JP2015144351 A JP 2015144351A JP 6472347 B2 JP6472347 B2 JP 6472347B2
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- 238000000034 method Methods 0.000 title claims description 17
- 238000000926 separation method Methods 0.000 claims description 22
- 239000000758 substrate Substances 0.000 claims description 22
- 230000001678 irradiating effect Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 25
- 238000003825 pressing Methods 0.000 description 8
- 230000001681 protective effect Effects 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 230000001902 propagating effect Effects 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 239000002346 layers by function Substances 0.000 description 3
- 238000003672 processing method Methods 0.000 description 2
- 229910009372 YVO4 Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
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Description
波長 :1064nm
繰り返し周波数 :80kHz
平均出力 :3.2W
パルス幅 :4ns
スポット径 :10μm
集光レンズの開口数(NA) :0.45
インデックス量 :400μm
11 SiCインゴット
13,37 第一のオリエンテーションフラット
15,39 第二のオリエンテーションフラット
19 c軸
21 c面
30 レーザービーム照射ユニット
31 SiCウエーハ
36 集光器(レーザーヘッド)
41 保護テープ
43 改質層
45 クラック
47 分離面
66 研削ホイール
72 研削砥石
Claims (2)
- 第一の面と、該第一の面と反対側の第二の面と、該第一の面から該第二の面に至るc軸と、該c軸に直交するc面とを有するSiC基板の該第一の面に複数のデバイスが形成されたウエーハを薄化するウエーハの薄化方法であって、
SiC基板に対して透過性を有する波長のレーザービームの集光点を該第二の面からSiC基板の該第一の面近傍に位置付けると共に、該集光点とSiC基板とを相対的に移動してレーザービームを該第二の面に照射し、該第一の面に平行な改質層及びクラックとを形成して分離起点とする分離起点形成ステップと、
該分離起点形成ステップを実施した後、外力を付与して該分離起点から該第二の面を有するウエーハを複数のデバイスが形成された該第一の面を有するウエーハから分離して、該第一の面を有するウエーハを薄化するウエーハ薄化ステップと、を備え、
該分離起点形成ステップは、該第二の面の垂線に対して該c軸がオフ角分傾き、該第二の面と該c面との間にオフ角が形成される方向と直交する方向にレーザービームの集光点を相対的に移動して直線状の改質層を形成する改質層形成ステップと、
該オフ角が形成される方向に該集光点を相対的に移動して所定量インデックスするインデックスステップと、を含むことを特徴とするウエーハの薄化方法。 - 該ウエーハ薄化ステップを実施した後、複数のデバイスが形成された該第一の面を有するウエーハの裏面を研削して平坦化する研削ステップを更に備えた請求項1記載のウエーハの薄化方法。
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