JP6747386B2 - Soiウェーハの製造方法 - Google Patents
Soiウェーハの製造方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 24
- 230000003647 oxidation Effects 0.000 claims description 128
- 238000007254 oxidation reaction Methods 0.000 claims description 128
- 238000009826 distribution Methods 0.000 claims description 88
- 238000010438 heat treatment Methods 0.000 claims description 56
- 238000005468 ion implantation Methods 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 7
- 235000012431 wafers Nutrition 0.000 description 91
- 238000005498 polishing Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000032798 delamination Effects 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000001698 pyrogenic effect Effects 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
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Description
前記犠牲酸化処理を施すSOIウェーハを、前記SOI層が特定の方向に傾斜した片流れ形状の膜厚分布を有するものとし、
前記犠牲酸化処理における熱酸化を、ウェーハ表面を水平方向に回転させる機構を有する縦型熱処理炉を使用し、前記SOIウェーハを回転させずに熱酸化を行う無回転酸化と、前記SOIウェーハを回転させながら熱酸化を行う回転酸化とを組み合わせて行うことにより、前記SOI層の片流れ形状の膜厚分布を相殺するように、前記SOI層の表面に片流れ形状の酸化膜厚分布を有する熱酸化膜を形成し、
該形成された熱酸化膜を除去することで、片流れ形状の膜厚分布が解消されたSOI層を有するSOIウェーハを製造することを特徴とするSOIウェーハの製造方法を提供する。
前記犠牲酸化処理を施すSOIウェーハを、前記SOI層が特定の方向に傾斜した片流れ形状の膜厚分布を有するものとし、
前記犠牲酸化処理における熱酸化を、ウェーハ表面を水平方向に回転させる機構を有する縦型熱処理炉を使用し、前記SOIウェーハを回転させずに熱酸化を行う無回転酸化と、前記SOIウェーハを回転させながら熱酸化を行う回転酸化とを組み合わせて行うことにより、
前記SOI層の片流れ形状の膜厚分布を相殺するように、前記SOI層の表面に片流れ形状の酸化膜厚分布を有する熱酸化膜を形成し、
該形成された熱酸化膜を除去することで、片流れ形状の膜厚分布が解消されたSOI層を有するSOIウェーハを製造することを特徴とするSOIウェーハの製造方法を提供する。
<片流れ形状のSOI層膜厚分布を有するSOIウェーハの作製>
下記のボンドウェーハ(熱酸化膜付き)の表面に下記イオン注入条件でイオン注入層を形成し、下記のベースウェーハの表面と熱酸化膜を介して貼り合わせた後、下記条件で剥離熱処理を行ってイオン注入層でボンドウェーハを剥離することにより、SOI層を有するSOIウェーハを作製し、該SOIウェーハに対して、下記条件で結合熱処理及び平坦化熱処理を施すことによって、SOIウェーハを作製した。
(ボンドウェーハ)
Si単結晶ウェーハ、直径300mm、<100>、p型、10Ωcm
熱酸化膜25nm付
(ベースウェーハ)
Si単結晶ウェーハ、直径300mm、<100>、
(イオン注入条件)
H+イオン、50keV、6×1016/cm2
(剥離熱処理)500℃、30分、窒素雰囲気
(結合熱処理)1050℃、1時間、酸化性雰囲気
(平坦化処理)1200℃、3時間、H2ガス100%
上記のSOIウェーハに対して行う犠牲酸化条件(1000℃、パイロジェニック酸化、酸化膜約410nm形成)において、モニターウェーハ(Si単結晶ウェーハ、直径300mm、<100>、p型、10Ωcm)を用い、無回転酸化のみで形成される酸化膜厚分布を測定した。その結果、酸化膜厚レンジは約5nmであり、その分布形状は、図4のように、炉の手前側から炉の奥方向に向かって酸化膜が薄くなる片流れ形状となっていることを確認した。
SOIウェーハのSOI膜厚が最も厚い位置が炉の手前側になるようにウェーハボートにセットし、その状態で30分の無回転酸化(1000℃、パイロジェニック酸化)を行った直後にウェーハボートを1rpmの回転速度で回転させ、そのまま2時間の回転酸化(1000℃、パイロジェニック酸化)を行った。犠牲酸化終了後のSOIウェーハを希フッ酸に浸漬してSOI層表面の酸化膜を除去した後、SOI層膜厚分布を測定した。その結果、SOI層の片流れ形状の膜厚分布が解消され、膜厚レンジ(Max−Min)は0.5nmに改善されていた。
犠牲酸化を、回転酸化(1rpm)のみで行ったこと以外は実施例1と同一条件で犠牲酸化処理を行い、SOI層膜厚分布を測定した。その結果、SOI層の片流れ形状の膜厚分布は解消されておらず、膜厚レンジ(Max−Min)は0.9nmに悪化していた。
犠牲酸化における無回転酸化及び回転酸化(1rpm)の時間を表1中に示すように設定した以外は、実施例1と同一条件で犠牲酸化処理を行い、SOI層膜厚分布を測定した。実施例2では、SOI層の片流れ形状は、犠牲酸化処理前に比べて解消が進み、ほぼ均一な形状になり、膜厚レンジ(Max−Min)も0.6nmに改善されていた。また、比較例2〜4では、SOI層の片流れ形状の膜厚分布の相殺を越えて、片流れ形状が逆に傾いてしまい、膜厚レンジ(Max−Min)も悪化した。
Claims (3)
- SOIウェーハに対し、SOI層表面を熱酸化し、形成された熱酸化膜を除去する犠牲酸化処理を施すことにより、前記SOIウェーハのSOI層を減厚調整する工程を有するSOIウェーハの製造方法において、
前記犠牲酸化処理を施すSOIウェーハを、前記SOI層が特定の方向に傾斜した片流れ形状の膜厚分布を有するものとし、
前記犠牲酸化処理における熱酸化を、ウェーハ表面を水平方向に回転させる機構を有する縦型熱処理炉を使用し、前記SOIウェーハを回転させずに熱酸化を行う無回転酸化と、前記SOIウェーハを回転させながら熱酸化を行う回転酸化とを組み合わせて行うことにより、
前記SOI層の片流れ形状の膜厚分布を相殺するように、前記SOI層の表面に片流れ形状の酸化膜厚分布を有する熱酸化膜を形成し、
該形成された熱酸化膜を除去することで、片流れ形状の膜厚分布が解消されたSOI層を有するSOIウェーハを製造することを特徴とするSOIウェーハの製造方法。 - 前記犠牲酸化処理における熱酸化として、前記無回転酸化を行った後に前記回転酸化を行うことを特徴とする請求項1に記載のSOIウェーハの製造方法。
- 前記SOI層が片流れ形状の膜厚分布を有する前記SOIウェーハを、イオン注入剥離法によりイオン注入層で剥離されたSOI層表面を平坦化するための平坦化熱処理を加えることによって作製することを特徴とする請求項1又は請求項2に記載のSOIウェーハの製造方法。
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