JP5518755B2 - 可変非点焦点ビームスポットを用いたカッティング装置及びその方法 - Google Patents
可変非点焦点ビームスポットを用いたカッティング装置及びその方法 Download PDFInfo
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70383—Direct write, i.e. pattern is written directly without the use of a mask by one or multiple beams
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- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
- B23K26/0608—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams in the same heat affected zone [HAZ]
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
- B23K26/0613—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams having a common axis
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
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- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
- B23K26/0613—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams having a common axis
- B23K26/0617—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams having a common axis and with spots spaced along the common axis
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/066—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms by using masks
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/067—Dividing the beam into multiple beams, e.g. multifocusing
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/073—Shaping the laser spot
- B23K26/0736—Shaping the laser spot into an oval shape, e.g. elliptic shape
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/362—Laser etching
- B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/268—Bombardment with radiation with high-energy radiation using electromagnetic radiation, e.g. laser radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/40—Semiconductor devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
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Description
本願は、2003年2月19日に出願された共係属中の米国仮出願シリアル番号60/448503の優先権の利益を享受するものである。
図2に、可変非点焦点ビームスポットを形成する一方法を詳細に示す。レーザーからの未加工ビーム50のプロファイルは一般にガウシアン分布に約0.5mmから3mmの径を有する。未加工ビーム50はBET14によって拡大し、拡大されたビーム52は直径で約2.5倍である。拡大されたビーム52はエッジの切り取り(クロッピング)のためのビーム成形アイリス絞り22を通過し、拡大されエッジが切り取れたビーム54はアナモフィックレンズ系24の中心に向ける。アナモフィックレンズ系24は、一の主経線においてだけ拡大されエッジが切り取れたビーム54を加工し、わずかに圧縮されたビーム形状56が形成される。わずかに圧縮されたレーザービーム56はビームフォーカスレンズ30へ進むので、非点収差の程度はビーム形状で増大する。なぜなら、可変アナモフィックレンズ系24はビームを一の主経線だけにおいて収束するからである。続いて、高圧縮されたビーム57はビームフォーカスレンズ30を通過して非点焦点ビームスポット58を形成する。高圧縮ビーム57は一の主経線においてビーム特性を収束し、他方の主経線においてビーム特性を平行にするので、焦点はビームフォーカスレンズ30の後に各主経線において独立に形成される。非点焦点ビームスポット58を形成するこの方法は例示のBDS10との関連において説明したが、これはこの方法における制限ではない。
基板を描画するために、非点焦点ビームスポットは基板に向けられ、描画される材料に依存するパラメータ群(例えば、波長、エネルギー密度、パルス繰り返し率、ビームサイズ)を有して適用される。一の方法に従うと、非点焦点ビームスポットは、例えばウェハー分離又はダイシング応用において、半導体ウェハーを描画するために用いすることができる。この方法では、ウェハーは、合焦されたレーザービームの下で少なくとも一のカッティング方向に移動若しくは並進して、一又は二以上のレーザー描画カットを形成できる。半導体ウェハーからダイを切り出すために、x方向にウェハーを移動し、次いでウェハーを90°回転した後にy方向にウェハーを移動することによって、複数の描画カットを作製することができる。x方向及びy方向に描画するとき、ウェハーを回転してx及びy方向にカットを提供するので、非点ビームスポットは一般的には偏光因子に対して鈍感である。描画カットを作製後、当業者に公知の技術を用いてダイを作製するために描画カットに沿って半導体ウェハーを分離することができる。
12 固体レーザー
14 BET
16 球形平凹レンズ
18 球形平凸レンズ
22 ビーム成形アイリス絞り
24 可変アナモフィックレンズ系
26 円筒型平凹レンズ
28 円筒型平凸レンズ
30 ビームフォーカスレンズ
58 ビームスポット
60 焦点
Claims (15)
- GaN層を有するサファイア基板を溝加工する方法であって、
固体レーザーを用いて前記サファイア基板上の前記GaN層の表面に、非点焦点ビームスポットを形成するレーザーエネルギーのパルスを向ける段階であって、レーザーのパルスが有するエネルギーを前記GaN層に印加して前記サファイア基板のアブレーションを誘起するところの段階と、
前記サファイア基板に溝加工ラインをカットするように、前記パルスを溝加工パターンで前記サファイア基板にあてる段階と、を備えた方法。 - 前記非点焦点ビームスポットが、第一の焦点を有する合焦軸と前記第一の焦点から独立した第二の焦点を有する非点収差軸とを備えた細長形状を有し、前記非点焦点ビームスポットが、前記非点収差軸に沿った長さと前記合焦軸に沿った幅とを有し、該幅が該長さよりも短い、請求項1に記載の方法。
- 前記非点焦点ビームスポットを形成するレーザーエネルギーのパルスを向ける段階が、
未加工レーザービームを生成する段階と、
前記未加工レーザービームを拡大する段階と、
該拡大ビームを加工する段階であって、該加工ビームが一の主経線においてコリメートされ、他の主経線において収束するように加工する段階と、
前記加工ビームについてビームフォーカシングレンズを通過させる段階と、を備え、
前記第二の焦点が前記ビームフォーカシングレンズの公称焦点距離より短く、前記第一の焦点がほぼ前記ビームフォーカシングレンズの前記公称焦点距離に形成される、請求項1に記載の方法。 - 前記拡大ビームを加工する段階が、前記拡大ビームについて円筒型平凹レンズと円筒型平凸レンズとを備えたアナモフィックレンズ系を通過させることを含む、請求項3に記載の方法。
- 前記非点焦点ビームスポットによって提供されるエネルギー密度を調節するために前記加工ビームの収束性を変更する段階をさらに備えた請求項3に記載の方法。
- 前記非点焦点ビームスポットが20μmより狭い幅を有する、請求項1に記載の方法。
- 前記非点焦点ビームスポットが約5μmの幅を有する、請求項1に記載の方法。
- 前記非点焦点ビームスポットが、前記基板に対するターゲットエネルギー密度で前記GaN層の表面に向けられる、請求項1に記載の方法。
- 前記ターゲットエネルギー密度が約10J/cm2である、請求項8に記載の方法。
- 前記ターゲットエネルギー密度が約5J/cm2である、請求項8に記載の方法。
- 前記非点焦点ビームスポットが、固体レーザーを用いて約400nmより小さなUV範囲内で生成されるレーザービームから形成される、請求項1に記載の方法。
- 前記レーザービームが略40nsより短いパルス継続時間を有するように生成される、請求項11に記載の方法。
- 前記パルスを溝加工パターンで前記サファイア基板にあてる段階が、前記基板において少なくとも一つの部分的カットを得るために前記非点焦点ビームスポットが前記基板のアブレーションを生じさせるように、前記非点焦点ビームスポットの前記長さに沿ったカッティング方向に前記基板を移動する段階を含む、請求項1に記載の方法。
- 前記基板が前記基板上のデバイス層を含む半導体ウェハーの一部であり、前記非点焦点ビームスポットの前記長さに沿って前記半導体ウェハーを移動する段階が前記半導体ウェハーに少なくとも一つの溝加工線を形成する、請求項13に記載の方法。
- 前記非点焦点ビームスポットが、レーザービームについて円筒型平凹レンズと円筒型平凸レンズとを備えたアナモフィックレンズ系を通過させることによって形成される、請求項1に記載の方法。
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US20080242056A1 (en) | 2008-10-02 |
TWI248244B (en) | 2006-01-21 |
CN1761549B (zh) | 2010-05-05 |
ATE553475T1 (de) | 2012-04-15 |
JP2011073064A (ja) | 2011-04-14 |
JP2006514886A (ja) | 2006-05-18 |
EP1595250B1 (en) | 2012-04-11 |
EP1595250A4 (en) | 2008-06-25 |
CN1761549A (zh) | 2006-04-19 |
JP4704915B2 (ja) | 2011-06-22 |
TW200417096A (en) | 2004-09-01 |
KR100790644B1 (ko) | 2008-01-02 |
KR20050116798A (ko) | 2005-12-13 |
WO2004075174A2 (en) | 2004-09-02 |
US8502112B2 (en) | 2013-08-06 |
US20100301027A1 (en) | 2010-12-02 |
WO2004075174A3 (en) | 2005-07-07 |
EP1595250A2 (en) | 2005-11-16 |
US20040228004A1 (en) | 2004-11-18 |
US7388172B2 (en) | 2008-06-17 |
US7709768B2 (en) | 2010-05-04 |
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