JP6482425B2 - 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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- JP6482425B2 JP6482425B2 JP2015144350A JP2015144350A JP6482425B2 JP 6482425 B2 JP6482425 B2 JP 6482425B2 JP 2015144350 A JP2015144350 A JP 2015144350A JP 2015144350 A JP2015144350 A JP 2015144350A JP 6482425 B2 JP6482425 B2 JP 6482425B2
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- Engineering & Computer Science (AREA)
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- High Energy & Nuclear Physics (AREA)
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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 環状溝
49 分離面
76 研削ホイール
82 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デバイス領域と該デバイス領域を囲繞する外周余剰領域とを備えたウエーハを薄化するウエーハの薄化方法であって、
該デバイス領域と該外周余剰領域との境界部に対応する該第二の面に薄化されたウエーハの仕上がり厚みに相当する厚みを残して環状溝を形成する環状溝形成ステップと、
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ウエーハの仕上がり厚みに相当する位置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、該環状溝に囲繞されたウエーハの仕上がり厚みに相当する位置に改質層及びクラック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と共に該外周余剰領域に対応する位置にリング状の補強部を形成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。
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015144350A JP6482425B2 (ja) | 2015-07-21 | 2015-07-21 | ウエーハの薄化方法 |
| TW105119574A TWI696539B (zh) | 2015-07-21 | 2016-06-22 | 晶圓之薄化方法 |
| MYPI2016702449A MY177495A (en) | 2015-07-21 | 2016-07-01 | Wafer thinning method |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |