JP6625854B2 - 光デバイスウエーハの加工方法 - Google Patents
光デバイスウエーハの加工方法 Download PDFInfo
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- B23K2103/00—Materials to be soldered, welded or cut
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
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Description
しかるに、サファイア基板の裏面から表面に亘って成長するシールドトンネルによってサファイア基板の表面に積層されたn型窒化ガリウム半導体層およびp型窒化ガリウム半導体層からなる発光層(エピ層)にダメージを与え光デバイスの輝度の低下を招くという問題がある。
サファイア基板に対して透過性を有する波長のパルスレーザー光線の集光点をサファイア基板の裏面側から内部に位置付けて分割予定ラインに対応する領域に沿って照射し、細孔と該細孔をシールドする非晶質とを成長させてシールドトンネルを分割予定ラインに対応する領域に沿って形成するシールドトンネル形成工程と、
該シールドトンネル形成工程が実施されたサファイア基板の表面に発光層を積層して光デバイスウエーハを形成する発光層積層工程と、
該発光層積層工程が実施された光デバイスウエーハに外力を付与し、光デバイスウエーハを分割予定ラインに沿って個々の光デバイスに分割する分割工程と、を含み、
該シールドトンネル形成工程は、サファイア基板の裏面とシールドトンネルとの間にシールドトンネルを構成しない非加工領域を残して該非加工領域から該サファイア基板の表面に至る細孔と該細孔をシールドする非晶質を含むシールドトンネルを形成するものであって、該発光層積層工程を実施した後、該分割工程を実施する前に該非加工領域の全てを除去する非加工領域除去工程を実施する光デバイスウエーハの加工方法が提供される。
波長 :1030nm
繰り返し周波数 :40kHz
パルス幅 :10ps
平均出力 :0.5W
スポット径 :φ5μm
加工送り速度 :400mm/秒
集光レンズの開口数 :0.25
上述したアライメント工程を実施したならば、上記図3の(a)乃至(e)に示す第1の実施形態と同様に図4の(a)で示すようにサファイア基板2の表面2aに積層される後述する発光層に形成される所定の分割予定ラインと対応する領域の一端(図4の(a)において左端)が集光器322の直下に位置するように位置付ける。そして、集光器322の集光レンズ322aによって集光されるパルスレーザー光線LBの集光点Pをサファイア基板2の裏面2bから80〜85μm表面2a側の位置に位置付ける(位置付け工程)。
なお、上記シールドトンネル形成工程の第2の実施形態における加工条件は、上記第1の実施形態と同様でよい。
即ち、図5の(a)に示すようにエピタキシャル成長装置5の基板支持テーブル51上に上述したシールドトンネル形成工程が実施されたサファイア基板2の表面2aを上側に向けて裏面2bを載置する。そして、サファイア基板2の表面2aに水平方向からトリメチルガリウムやNH3などの原料ガス52を流しながら、原料ガス52をサファイア基板2の表面2aに押し付けるためにH2やN2などの不活性ガス53をサファイア基板2の表面2aに垂直な方向から流すことにより、サファイア基板2の表面2aにGaN膜が成長して、図5の(b)または(c)に示すようにn型窒化ガリウム半導体層201およびp型窒化ガリウム半導体層202からなる発光層20が例えば10μmの厚みで積層して形成される。なお、図5の(b)は上述したシールドトンネル形成工程の第1の実施形態が実施されたサファイア基板2の表面2aに発光層20を形成した例を示し、図5の(c)は上述したシールドトンネル形成工程の第2の実施形態が実施されたサファイア基板2の表面2aに発光層20を形成した例を示している。この発光層積層工程を実施する際に、図5の(b)に示すように上述したシールドトンネル形成工程の第1の実施形態が実施されたサファイア基板2のように裏面から表面に亘ってシールドトンネル21が形成されているとシールドトンネル21に沿って割れる虞があるが、図5の(c)に示すように上述したシールドトンネル形成工程の第2の実施形態が実施されたサファイア基板2のようにシールドトンネル21と裏面2bとの間に非加工領域22が形成されていることにより剛性が高くなるので割れが発生する虞はない。
なお、上述した実施形態においては、サファイア基板2の一方の面を表面と定義し他方の面を裏面と定義して他方の面である裏面側からパルスレーザー光線を照射してシールドトンネル形成工程を実施し、一方の面である表面に発光層20を積層した例を示したが、サファイア基板2の一方の面を裏面と定義し他方の面を表面を定義した場合には、一方の面である裏面側からパルスレーザー光線を照射してシールドトンネル形成工程を実施し、他方の面である表面に発光層20を積層する。
2c:オリエンテーションフラット
20:発光層(エピ層)
203:分割予定ライン
204:光デバイス
21:シールドトンネル
3:レーザー加工装置
31:レーザー加工装置のチャックテーブル
32:レーザー光線照射手段
322:集光器
5:エピタキシャル成長装置
6:研削装置
61:研削装置のチャックテーブル
62:研削手段
634:研削ホイール
7:分割装置
Claims (1)
- サファイア基板の表面に発光層が形成され格子状の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光デバイスが形成された光デバイスウエーハを個々の光デバイスに分割する光デバイスウエーハの加工方法であって、
サファイア基板に対して透過性を有する波長のパルスレーザー光線の集光点をサファイア基板の裏面側から内部に位置付けて分割予定ラインに対応する領域に沿って照射し、細孔と該細孔をシールドする非晶質とを成長させてシールドトンネルを分割予定ラインに対応する領域に沿って形成するシールドトンネル形成工程と、
該シールドトンネル形成工程が実施されたサファイア基板の表面に発光層を積層して光デバイスウエーハを形成する発光層積層工程と、
該発光層積層工程が実施された光デバイスウエーハに外力を付与し、光デバイスウエーハを分割予定ラインに沿って個々の光デバイスに分割する分割工程と、を含み、
該シールドトンネル形成工程は、サファイア基板の裏面とシールドトンネルとの間にシールドトンネルを構成しない非加工領域を残して該非加工領域から該サファイア基板の表面に至る細孔と該細孔をシールドする非晶質を含むシールドトンネルを形成するものであって、該発光層積層工程を実施した後、該分割工程を実施する前に該非加工領域の全てを除去する非加工領域除去工程を実施する光デバイスウエーハの加工方法。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2015198571A JP6625854B2 (ja) | 2015-10-06 | 2015-10-06 | 光デバイスウエーハの加工方法 |
TW105127298A TWI703623B (zh) | 2015-10-06 | 2016-08-25 | 光元件晶圓的加工方法 |
CN201610862695.3A CN107039563B (zh) | 2015-10-06 | 2016-09-28 | 光器件晶片的加工方法 |
US15/281,404 US10109527B2 (en) | 2015-10-06 | 2016-09-30 | Optical device wafer processing method |
KR1020160127587A KR102486694B1 (ko) | 2015-10-06 | 2016-10-04 | 광 디바이스 웨이퍼의 가공 방법 |
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JP2015198571A JP6625854B2 (ja) | 2015-10-06 | 2015-10-06 | 光デバイスウエーハの加工方法 |
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JP6625854B2 true JP6625854B2 (ja) | 2019-12-25 |
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CN (1) | CN107039563B (ja) |
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JP7184455B2 (ja) * | 2018-06-27 | 2022-12-06 | 株式会社ディスコ | ウェーハの加工方法 |
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KR102486694B1 (ko) | 2023-01-09 |
CN107039563B (zh) | 2021-01-12 |
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