JP7110204B2 - イントリンシックゲッタリングおよびゲート酸化物完全性歩留まりを有するシリコンウエハを処理する方法 - Google Patents
イントリンシックゲッタリングおよびゲート酸化物完全性歩留まりを有するシリコンウエハを処理する方法 Download PDFInfo
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- JP7110204B2 JP7110204B2 JP2019535384A JP2019535384A JP7110204B2 JP 7110204 B2 JP7110204 B2 JP 7110204B2 JP 2019535384 A JP2019535384 A JP 2019535384A JP 2019535384 A JP2019535384 A JP 2019535384A JP 7110204 B2 JP7110204 B2 JP 7110204B2
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- 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
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- Crystals, And After-Treatments Of Crystals (AREA)
Description
本出願は、2016年12月28日に出願された米国仮特許出願第62/439,621号に対する優先権を主張する。その開示内容は、その全体が、参照により本明細書に組み入れられる。
I.基板
II.急速熱アニール
本発明の方法によれば、急速熱処理を実施してウエハ内の酸素析出のためのプロファイルまたはテンプレートを確立する酸素析出核の分布を形成する。1つまたは複数の実施形態では、テンプレートは、ウエハバルク内に酸素析出物を有するが、本明細書では無析出帯または“デヌーデッドゾーン(Denuded Zone)”と呼ぶことがある表面近傍領域に低密度の、好ましくは本質的に存在しない酸素析出物を有するウエハ用である。有利には、任意の所望の深さのデヌーデッドゾーンを得ることができる。いくつかの実施形態では、デヌーデッドゾーンの深さは、ウエハの前面から中心面に向かって測定したときに少なくとも約1マイクロメートル、少なくとも約3マイクロメートル、または少なくとも約5マイクロメートルであり得る。いくつかの実施形態では、デヌーデッドゾーンの深さは、ウエハの前面から中心面に向かって測定したとき、約30マイクロメートル未満、または20マイクロメートル未満、15マイクロメートル未満などの約40マイクロメートル未満、またはウエハの前面から中心面に向かって測定して、10マイクロメートル未満でさえあり得る。さらに、テンプレートは、酸素析出物のピーク密度(酸素析出物を形成するのに十分な後のアニールから生じる)が、ウエハ表面の約40マイクロメートル以内、例えばウエハ表面の約30マイクロメートル以内、またはウエハ表面から約10マイクロメートル~約20マイクロメートルの間で起こり得る。
III.酸化アニール
IV.ゲート酸化膜の完全性歩留まり
2Oi=+Si-->SiO2+4e-
V.酸素析出熱処理
VI.ウエハの後プロセス
1.エッチング
2.研磨
3.エピタキシャル層
4.シリコンオンインシュレータ(SOI)
Claims (12)
- 単結晶シリコンウエハを処理するプロセスであって、
前記プロセスは、
(1)(a)約1100℃~約1200℃の間の温度で、約1秒~約60秒の間の時間、窒素含有ガスを含む第1の雰囲気中で前記単結晶シリコンウエハを熱処理して、(b)その後、約1200℃~約1300℃の間の温度で、約1秒~約60秒の間の時間、窒素含有ガスを含む第1の雰囲気中で熱処理をするステップであって、前記単結晶シリコンウエハは、2つの主要な平行面、そのうちの1つは、前面であり、1つは背面であり、前記前面と前記背面との間の中心面、前記前面と前記背面を接合する周縁部、および前記前面と前記中心面との間のバルク領域と、を含み、前記単結晶シリコンウエハは、2×1017原子/cm3~9×1017原子/cm3の間の酸素濃度を有し、さらに前記第1の雰囲気中でのウエハの熱処理は、前記単結晶シリコンウエハの前記バルク領域の結晶格子空孔の密度を増加させ、さらに前記第1の雰囲気中での熱処理は、前記単結晶シリコンウエハの前記前面に窒化シリコン層を形成する、ステップと、
(2)前記単結晶シリコンウエハの前記前面から前記窒化シリコン層を除去するステップと、
(3)酸素含有ガスを含む第2の雰囲気中で、約900℃~約1100℃の間の温度で30分を超える時間、前記単結晶シリコンウエハを熱処理して、前記単結晶シリコンウエハの前記前面に、少なくとも約50オングストロームおよび約1000オングストローム未満の最小厚さを有する酸化シリコン層を形成するステップと、
(4)前記単結晶シリコンウエハの前記前面から前記酸化シリコン層を除去するステップと、
(5)前記単結晶シリコンウエハを、700℃を超える温度で、前記ウエハの前記バルク領域に酸素析出物を形成するのに十分な持続時間でアニールするステップであって、前記単結晶シリコンウエハ中の深さDを有する前面層は、約4×10 8 析出物/cm3未満の密度で酸素析出物を含み、さらに前記前面層の深さDは、6.8マイクロメートル以上かつ約40マイクロメートル未満である、ステップと、
をステップ(1)、(2)、(3)、(4)、(5)の順序で行うことを含む、プロセス。 - 前記窒素含有ガスを含む前記第1の雰囲気は、窒素、アンモニア、または窒素とアンモニアの組み合わせを含む請求項1に記載のプロセス。
- 前記窒化シリコン層を、研磨、化学エッチング、またはプラズマエッチングによって除去する請求項1に記載のプロセス。
- 前記酸素含有ガスを含む前記第2の雰囲気は、酸素、水蒸気、または酸素と水蒸気の組み合わせを含む請求項1に記載のプロセス。
- 前記単結晶シリコンウエハを、前記酸素含有ガスを含む前記第2の雰囲気中で、約900℃~約1100℃の間の温度で120分を超える時間、熱処理する請求項1に記載のプロセス。
- 前記単結晶シリコンウエハを、前記酸素含有ガスを含む前記第2の雰囲気中で、約950℃~約1100℃の間の温度で60分を超える時間、熱処理する請求項1に記載のプロセス。
- 前記単結晶シリコンウエハを、前記酸素含有ガスを含む前記第2の雰囲気中で、約1000℃~約1100℃の間の温度で30分を超える時間、熱処理する請求項1に記載のプロセス。
- 前記バルク領域は、酸素を含む前記第2の雰囲気中での熱処理後に、少なくとも約1×108析出物/cm3の密度で酸素析出物を含む請求項1に記載のプロセス。
- 前記バルク領域は、酸素を含む前記第2の雰囲気中での熱処理後に、少なくとも約1×109析出物/cm3の密度で酸素析出物を含む請求項1に記載のプロセス。
- 前記バルク領域は、酸素を含む前記第2の雰囲気中での熱処理後に、少なくとも約5×109析出物/cm3のピーク密度で酸素析出物を含む請求項1に記載のプロセス。
- 前記酸化シリコン層を、研磨、化学エッチング、またはプラズマエッチングによって除去する請求項1に記載のプロセス。
- ステップ(5)のアニールは、
(a)前記単結晶シリコンウエハを800℃で4~8時間アニールするステップと、
(b)前記単結晶シリコンウエハを1000℃で16時間アニールするステップと、
をこの順序で行うことを含む請求項1に記載のプロセス。
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