JP2005520340A - レーザー熱処理用の熱誘導反射率スイッチ - Google Patents
レーザー熱処理用の熱誘導反射率スイッチ Download PDFInfo
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Abstract
Description
本発明は以下に述べるように動作する。図1および図2に示すように、アモルファスドープ領域30を活性化させるために、レーザー放射線10を軸Aに沿って膜積層体6に向けることによってウエハWのLTPを行う。反射率スイッチ層60は、最初は実質的に透明である。したがって、レーザー放射線10のほとんどは層60を通過し、吸収層50に入射する。放射線10は層50に吸収され、層50が加熱される。加熱された吸収層50は、アモルファスドープ領域30および反射率スイッチ層60に熱を再放射する。その結果、アモルファスドープ領域30が1100〜1410℃の活性温度まで加熱されるとともに、反射率スイッチ層60も臨界温度まで加熱される。活性温度の範囲では、ドーパント34は格子サイトに取り込まれ、「活性化」される。しかし、吸収層50に過量のレーザー放射線が入射すると、アモルファス領域30に過度の熱が与えられる。本発明は、ワークピースに望ましくない影響(例えば溶解)が及ぼされることのない上限温度である最大ワークピース温度以上にワークピース(ウエハW)が到達することを防止する。このような余分な熱によって、下地の結晶シリコン領域20が溶融することがある。これは、アモルファスドープ領域30の特性に悪影響を及ぼす。後者がトランジスタのソースまたはドレイン領域を構成している場合には、そのような過熱はトランジスタのゲート領域(図示せず)にダメージを与えることがある。
層40:二酸化シリコン:10nm
層50:チタン:40nm
層62:二酸化シリコン:80nm
層64:アモルファスシリコン:163nm
これらの材料からなる積層体の場合、膜積層体6は6%の(室温における)最小反射率を有し、(領域30の活性化温度における)最大反射率は70%であることが予想される。
層40:二酸化シリコン:10nm
層50:チタン:20nmおよび窒化チタン:20nm
層62:二酸化シリコン:80nm
層64:アモルファスシリコン:163nm
波長が1064nmでパルス長が30ナノ秒の場合には、
層40:二酸化シリコン:10nm
層50:チタン:20nmおよび窒化チタン:20nm
層62:二酸化シリコン:266nm
層64:アモルファスシリコン:50nm
したがって、反射率スイッチ層60は、アモルファスドープ領域30が約1410℃の温度に到達する前であって、1100℃のドーパント活性化温度に到達した後に、反射率の変化が起こる臨界温度に到達するように設計される。これは、上述したように断熱層62を適切に設計することによって達成される。上述したように厚みと熱的特性を選択することによって、反射率が適切な温度で切り替わるように遷移層64の温度を設定することができる。反射率スイッチ層64が低反射率状態RLから高反射率状態RHに移行すると、入射レーザー放射線10は図2の反射放射線10’に示すように反射される。これによって吸収層50がさらに加熱されることを防止することができるため、アモルファスドープ領域30がさらに加熱されることを防止することができる。
上述の内容に基づき、本発明は半導体ウエハから半導体デバイスを形成する方法を含む。図5Aに示すように、本発明の方法は、それぞれが活性化温度を有するソースおよびドレイン領域110Sおよび110Dなどのアモルファスドープシリコン領域を有するデバイス100を含む半導体ウエハWに、1以上の処理領域を形成する工程を含む。以降の工程では、処理領域上に吸収層を成膜し、吸収層上に反射率スイッチ層を成膜し、反射率スイッチ層を介して吸収層に放射線を照射して、吸収層と反射率スイッチ層を加熱する。これらの工程は上述した通りであり、反射率スイッチ層が活性化温度に到達するまで吸収層からの熱で処理領域を加熱する工程と同様である。ここで、反射率スイッチ層が高反射率状態に切り替わり、吸収層に入射する放射線の量が減少する。最後の工程では、吸収層と反射率スイッチ層を除去する。この工程は、通常のエッチング技術を使用して行うことができる。
Claims (30)
- ワークピースの1以上の処理領域を吸収層で被覆すること;
臨界温度で反射率が変化するように設計された反射率スイッチ層を前記吸収層上に形成し、前記反射率スイッチ層を介して前記吸収層に入射する放射線から前記吸収層に吸収され、前記1以上の処理領域に移動する熱の量を制限すること;
を含むことを特徴とする方法。 - 前記放射線照射はレーザー放射線を使用して行なわれる、請求項1に記載の方法。
- 前記レーザー放射線はパルス照射される、請求項2に記載の方法。
- 前記レーザー放射線はスキャン照射される、請求項2に記載の方法。
- 前記レーザー放射線は500〜1100nmの波長を有する、請求項2に記載の方法。
- 前記吸収層と前記ワークピースとの間に剥離可能層を形成することをさらに含む、請求項1に記載の方法。
- 前記剥離可能層の形成は、二酸化シリコンおよび/または窒化シリコンを成膜することを含む、請求項3に記載の方法。
- 前記1以上の処理領域は活性化温度を有するとともに、前記ワークピースは溶融温度を有し、前記反射率スイッチ層の前記臨界温度を、前記活性化温度よりも高く、前記溶融温度よりも低くなるように設計することをさらに含む、請求項1に記載の方法。
- 前記1以上の処理領域の少なくとも1つを、ドープされたアモルファスシリコンを含むように形成することを含む、請求項1に記載の方法。
- 前記吸収層の形成は、チタン、窒化チタン、タンタル、窒化タングステン、二酸化シリコン、窒化シリコンからなる群から選択される1以上の材料を成膜することを含む、請求項1に記載の方法。
- ワークピースの1以上の処理領域を吸収層で被覆すること;
臨界温度で反射率が変化する反射率スイッチ層を前記吸収層上に形成すること;
を含むことを特徴とする方法。 - 前記反射率スイッチ層を介して前記吸収層に放射線を照射して前記吸収層を加熱すること;
前記吸収層からの熱を前記1以上の処理領域と前記反射率スイッチ層に移動させること;
を含む、請求項11に記載の方法。 - 前記吸収層上に断熱層を形成し、前記断熱層上に遷移層を形成することによって、前記反射率スイッチ層を形成することを含む、請求項11に記載の方法。
- 前記断熱層の厚みを調節して前記臨界温度を設定することを含む、請求項11に記載の方法。
- 前記断熱層の形成は、二酸化シリコンを成膜することを含む、請求項13に記載の方法。
- 前記遷移層の形成は、アモルファスシリコンまたは多結晶シリコンを成膜することを含む、請求項15に記載の方法。
- 前記二酸化シリコンを約10〜250nmの厚みに成膜することを含む、請求項15に記載の方法。
- 前記アモルファスシリコンまたは多結晶シリコンの成膜は、約10〜250nmの厚みを有するアモルファスシリコンまたは多結晶シリコンの層を形成するように行われる、請求項16に記載の方法。
- 前記反射率スイッチ層が高反射率状態に切り替わるまで、低反射率状態の前記反射率スイッチ層を介して前記吸収層にレーザー放射線を照射することを含む、請求項11に記載の方法。
- 前記レーザー放射線は500〜1100nmの波長を有する、請求項19に記載の方法。
- 前記放射線照射はパルスレーザー放射線を照射することを含む、請求項12に記載の方法。
- 前記放射線照射はスキャンレーザー放射線を照射することを含む、請求項12に記載の方法。
- 低反射率状態から高反射率状態に変化させる時に、前記反射率スイッチ層を固体から液体に変化させることをさらに含む、請求項12に記載の方法。
- 前記1以上の処理領域が異なる熱容量を有し、高い熱容量を有する前記処理領域上に位置する前記反射率スイッチ層の部分が、低い熱容量を有する前記処理領域上に位置する前記反射率スイッチ層の部分とは異なる時点で低反射率状態から高反射率状態に切り替わる、請求項12に記載の方法。
- 前記1以上の処理領域が異なる反射率を有し、高い反射率を有する前記処理領域上に位置する前記反射率スイッチ層の部分が、低い反射率を有する前記処理領域上に位置する前記反射率スイッチ層の部分とは異なる時点で低反射率状態から高反射率状態に切り替わる、請求項12に記載の方法。
- 1以上の処理領域を有する基板を用意すること;
前記1以上の処理領域を吸収層で被覆すること;
臨界温度で反射率が低反射率状態から高反射率状態に変化するように設計された反射率スイッチ層で前記吸収層を被覆すること;
を含むことを特徴とする方法。 - 前記反射率スイッチ層を介して前記吸収層に放射線を照射して前記吸収層を加熱することをさらに含む、請求項26に記載の方法。
- 前記放射線照射は、500〜1100nmの波長を有するレーザー放射線を照射することを含む、請求項26に記載の方法。
- 前記放射線照射はパルスレーザー放射線を照射することを含む、請求項26に記載の方法。
- 前記放射線照射はスキャンレーザー放射線を照射することを含む、請求項26に記載の方法。
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-
2002
- 2002-02-19 US US10/078,842 patent/US6635588B1/en not_active Expired - Lifetime
- 2002-12-19 KR KR1020047012743A patent/KR100696921B1/ko not_active IP Right Cessation
- 2002-12-19 EP EP02799972A patent/EP1485947A4/en not_active Withdrawn
- 2002-12-19 WO PCT/US2002/041091 patent/WO2003079423A1/en active Application Filing
- 2002-12-19 JP JP2003577321A patent/JP2005520340A/ja active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008277696A (ja) * | 2007-05-07 | 2008-11-13 | Toshiba Corp | 半導体装置の製造方法 |
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KR100696921B1 (ko) | 2007-03-20 |
WO2003079423A1 (en) | 2003-09-25 |
KR20040091054A (ko) | 2004-10-27 |
EP1485947A1 (en) | 2004-12-15 |
EP1485947A4 (en) | 2008-03-19 |
US6635588B1 (en) | 2003-10-21 |
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