JP7166431B2 - 基板処理方法、半導体装置の製造方法、基板処理装置、およびプログラム - Google Patents
基板処理方法、半導体装置の製造方法、基板処理装置、およびプログラム Download PDFInfo
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- JP7166431B2 JP7166431B2 JP2021506099A JP2021506099A JP7166431B2 JP 7166431 B2 JP7166431 B2 JP 7166431B2 JP 2021506099 A JP2021506099 A JP 2021506099A JP 2021506099 A JP2021506099 A JP 2021506099A JP 7166431 B2 JP7166431 B2 JP 7166431B2
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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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- C23C16/45523—Pulsed gas flow or change of composition over time
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Description
(a)第1温度下で、第1下地と第2下地とが表面に露出した基板に対して、吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面に吸着させる工程と、
(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面に前記吸着抑制剤を吸着させた後の前記基板を熱アニールする工程と、
(c)前記第2温度よりも低い第3温度下で、前記熱アニール後の前記基板に対して成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する工程と、
を行う技術が提供される。
以下、本開示の一態様について、主に、図1~図4を参照しながら説明する。
図1に示すように、処理炉202は加熱機構(温度調整部)としてのヒータ207を有する。ヒータ207は円筒形状であり、保持板に支持されることにより垂直に据え付けられている。ヒータ207は、ガスを熱で活性化(励起)させる活性化機構(励起部)としても機能する。
上述の基板処理装置を用い、半導体装置の製造工程の一工程として、基板としてのウエハ200の表面に露出した複数種類の下地のうち特定の下地の表面上に選択的に膜を成長させて形成する選択成長(選択成膜)の処理シーケンス例について、主に、図4、図5(a)~図5(d)を用いて説明する。以下の説明において、基板処理装置を構成する各部の動作はコントローラ121により制御される。
第1温度下で、タングステン膜(W膜)を含む第1下地(下地200a)とシリコン窒化膜(SiN膜)を含む第2下地(下地200b)とが表面に露出したウエハ200に対して、吸着抑制剤としてDMATMSガスを供給し、下地200aおよび下地200bのうち一方の下地(ここでは下地200b)の表面に吸着させるステップAと、
第1温度よりも高い第2温度下で、下地200bの表面にDMATMSを吸着させた後のウエハ200を熱アニールするステップBと、
第2温度よりも低い第3温度下で、熱アニール後のウエハ200に対して成膜ガスとしてTiCl4ガスおよびNH3ガスを供給することにより、下地200aおよび下地200bのうち上述の一方の下地とは異なる他方の下地(ここでは下地200a)の表面上に、膜として、TiおよびNを含む膜であるチタン窒化膜(TiN膜)を形成するステップCと、を行う。
複数枚のウエハ200がボート217に装填(ウエハチャージ)されると、シャッタ開閉機構115sによりシャッタ219sが移動させられて、マニホールド209の下端開口が開放される(シャッタオープン)。その後、図1に示すように、複数枚のウエハ200を支持したボート217は、ボートエレベータ115によって持ち上げられて処理室201内へ搬入(ボートロード)される。この状態で、シールキャップ219は、Oリング220bを介してマニホールド209の下端をシールした状態となる。
処理室201内、すなわち、ウエハ200が存在する空間が所望の圧力(真空度)となるように、真空ポンプ246によって真空排気(減圧排気)される。この際、処理室201内の圧力は圧力センサ245で測定され、この測定された圧力情報に基づきAPCバルブ244がフィードバック制御される。また、処理室201内のウエハ200が所望の処理温度となるように、ヒータ207によって加熱される。この際、処理室201内が所望の温度分布となるように、温度センサ263が検出した温度情報に基づきヒータ207への通電具合がフィードバック制御される。また、回転機構267によるウエハ200の回転を開始する。処理室201内の排気、ウエハ200の加熱および回転は、いずれも、少なくともウエハ200に対する処理が終了するまでの間は継続して行われる。
その後、次のステップA~Cを順次実行する。
このステップでは、第1温度下で、処理室201内のウエハ200、すなわち、表面に下地200a~200cがそれぞれ露出したウエハ200に対してDMATMSガスを供給する。
DMATMSガス供給流量:50~1000sccm、好ましくは50~500sccm
DMATMSガス供給時間:1~60分、好ましくは10~30分
N2ガス供給流量(ガス供給管毎):0~10000sccm
処理温度(第1温度):50~300℃、好ましくは80~200℃
処理圧力:10~1000Pa、好ましくは100~500Pa
が例示される。ここで述べた条件は、処理室201内においてDMATMSガスが気相分解(熱分解)しない条件である。
このステップでは、第1温度よりも高い第2温度下で、下地200b,200cの表面にDMATMSを吸着させた後のウエハ200を熱アニールするように、ヒータ207の出力を調整する。このステップは、バルブ243d~243fを開き、処理室201内へN2ガスを供給した状態で行ってもよく、また、バルブ243d~243fを閉じ、処理室201へのN2ガスの供給を停止した状態で行ってもよい。
N2ガス供給流量(ガス供給管毎):0~1000sccm、好ましくは50~500sccm
処理温度(第2温度):400~600℃、好ましくは450~550℃
処理圧力:1~1000Pa、好ましくは100~500Pa
処理時間:1分~12時間、好ましくは1~5時間
が例示される。
このステップでは、ステップC1,C2を順次実行する。
このステップでは、処理室201内のウエハ200、すなわち、熱アニール後のウエハ200に対してTiCl4ガスを供給する。
TiCl4ガス供給流量:1~1000sccm、好ましくは10~500sccm
TiCl4ガス供給時間:1~60秒、好ましくは2~10秒
処理温度(第3温度):50~250℃、好ましくは150~200℃
処理圧力:1~500Pa、好ましくは10~100Pa
が例示される。他の処理条件は、ステップAにおける処理条件と同様とする。
このステップでは、処理室201内のウエハ200、すなわち、下地200a上に形成されたTi含有層に対してNH3ガスを供給する。
NH3ガス供給流量:100~2000sccm、500~1000sccm
NH3ガス供給時間:10~200秒、好ましくは20~120秒
処理圧力:1~1000Pa、好ましくは50~500Pa
が例示される。他の処理条件は、ステップC1における処理条件と同様とする。
上述したステップC1,C2を非同時に、すなわち、同期させることなく行うサイクルを所定回数(n回、nは1以上の整数)行うことにより、図5(d)に示すように、ウエハ200の表面に露出した下地200a~200cのうち下地200aの表面上にTiN膜を選択的に形成することができる。上述のサイクルは、複数回繰り返すのが好ましい。すなわち、1サイクルあたりに形成されるTiN層の厚さを所望の膜厚よりも薄くし、TiN層を積層することで形成される膜の膜厚が所望の膜厚になるまで、上述のサイクルを複数回繰り返すのが好ましい。
下地200aの表面上へのTiN膜の選択的な形成が完了した後、ノズル249a~249cのそれぞれからパージガスとしてのN2ガスを処理室201内へ供給し、排気口231aより排気する。これにより、処理室201内がパージされ、処理室201内に残留するガスや反応副生成物等が処理室201内から除去される(アフターパージ)。その後、処理室201内の雰囲気が不活性ガスに置換され(不活性ガス置換)、処理室201内の圧力が常圧に復帰される(大気圧復帰)。
処理室201内の圧力が常圧に復帰された後、ボートエレベータ115によりシールキャップ219が下降され、マニホールド209の下端が開口される。そして、処理済のウエハ200が、ボート217に支持された状態でマニホールド209の下端から反応管203の外部に搬出(ボートアンロード)される。ボートアンロードの後は、シャッタ219sが移動させられ、マニホールド209の下端開口がOリング220cを介してシャッタ219sによりシールされる(シャッタクローズ)。処理済のウエハ200は、反応管203の外部に搬出された後、ボート217より取り出される(ウエハディスチャージ)。
本態様によれば、以下に示す1つ又は複数の効果が得られる。
以上、本開示の態様を具体的に説明した。しかしながら、本開示は上述の態様に限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能である。
DMATMS→ANL→(TiCl4→NH3→O2)×n ⇒ TiON
DMATMS→ANL→(TiCl4→O3)×n ⇒ TiO
DMATMS→ANL→(4CS→NH3→O2)×n ⇒ SiON
DMATMS→ANL→(DCS→BCl3→NH3)×n ⇒ SiBN
DMATMS→ANL→(DCS→C3H6→BCl3→NH3)×n ⇒ SiBCN
DMATMS→ANL→(HCDS→C3H6→NH3)×n ⇒ SiCN
DMATMS→ANL→(HCDS→C3H6→NH3→O2)×n ⇒ SiOCN
DMATMS→ANL→(HCDS→TEA→O2)×n ⇒ SiOC(N)
DMATMS→ANL→(3DMAS→O3)×n ⇒ SiO
200a 下地(第1下地)
200b 下地(第2下地)
200c 下地(第3下地)
Claims (23)
- (a)第1温度下で、酸素非含有の金属元素含有膜を含む第1下地と酸素非含有の半金属元素含有膜を含む第2下地とを表面に有する基板に対して、吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面に吸着させる工程と、
(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面に前記吸着抑制剤を吸着させた後の前記基板をアニールする工程と、
(c)前記第2温度よりも低い第3温度下で、前記アニール後の前記基板に対して成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する工程と、
を有する基板処理方法。 - (a)では、前記吸着抑制剤の前記他方の下地の表面への吸着を抑制しつつ、前記吸着抑制剤を前記一方の下地の表面に吸着させる請求項1に記載の基板処理方法。
- (a)を、前記吸着抑制剤が気相分解しない条件下で行う請求項1に記載の基板処理方法。
- (a)での前記一方の下地の表面への前記吸着抑制剤の吸着状態は、物理吸着を含む請求項1に記載の基板処理方法。
- (b)では、前記一方の下地の表面への前記吸着抑制剤の吸着状態を、化学吸着へ移行させる請求項4に記載の基板処理方法。
- (b)では、前記一方の下地の表面への前記吸着抑制剤の吸着状態を、(a)での前記一方の下地の表面への前記吸着抑制剤の吸着状態よりも安定な吸着状態へ変化させる請求項1に記載の基板処理方法。
- (c)では、前記一方の下地の表面上に前記膜を形成することなく、前記他方の下地の表面上に前記膜を形成する請求項1に記載の基板処理方法。
- (a)第1温度下で、第1下地と第2下地と第3下地とを表面に有する基板に対して、吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面と、前記第3下地の表面と、に吸着させる工程と、
(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面と、前記第3下地の表面と、に前記吸着抑制剤を吸着させた後の前記基板をアニールする工程と、
(c)前記第2温度よりも低い第3温度下で、前記アニール後の前記基板に対して成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する工程と、
を有する基板処理方法。 - (a)での前記第3下地の表面への前記吸着抑制剤の吸着状態は、化学吸着を含む請求項8に記載の基板処理方法。
- (a)での前記第3下地の表面への前記吸着抑制剤の吸着状態は、(a)での前記一方の下地の表面への前記吸着抑制剤の吸着状態よりも安定な吸着状態である請求項8に記載の基板処理方法。
- (c)では、前記一方の下地の表面上、および、前記第3下地の表面上に前記膜を形成することなく、前記他方の下地の表面上に前記膜を形成する請求項8に記載の基板処理方法。
- 前記第1下地は酸素非含有の金属元素含有膜を含み、前記第2下地は酸素非含有の半金属元素含有膜を含み、前記第3下地は酸素含有膜を含む請求項8に記載の基板処理方法。
- 前記第1下地は導電性の金属元素含有膜を含み、前記第2下地は窒化膜を含み、前記第3下地は酸化膜を含む請求項8に記載の基板処理方法。
- 前記第1下地は遷移金属含有膜を含み、前記第2下地はシリコンおよび窒素を含有する膜を含み、前記第3下地はシリコンおよび酸素を含有する膜を含む請求項8に記載の基板処理方法。
- 前記一方の下地は前記第2下地であり、前記他方の下地は前記第1下地である請求項12に記載の基板処理方法。
- 前記一方の下地は前記第2下地であり、前記他方の下地は前記第1下地である請求項1に記載の基板処理方法。
- (a)、(b)、および(c)のうち少なくともいずれかをノンプラズマの雰囲気下で行う請求項1~16のいずれか1項に記載の基板処理方法。
- (a)第1温度下で、酸素非含有の金属元素含有膜を含む第1下地と酸素非含有の半金属元素含有膜を含む第2下地とを表面に有する基板に対して、吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面に吸着させる工程と、
(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面に前記吸着抑制剤を吸着させた後の前記基板をアニールする工程と、
(c)前記第2温度よりも低い第3温度下で、前記アニール後の前記基板に対して成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する工程と、
を有する半導体装置の製造方法。 - (a)第1温度下で、第1下地と第2下地と第3下地とを表面に有する基板に対して、吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面と、前記第3下地の表面と、に吸着させる工程と、
(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面と、前記第3下地の表面と、に前記吸着抑制剤を吸着させた後の前記基板をアニールする工程と、
(c)前記第2温度よりも低い第3温度下で、前記アニール後の前記基板に対して成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する工程と、
を有する半導体装置の製造方法。 - 基板が処理される処理室と、
前記処理室内の基板に対して吸着抑制剤を供給する吸着抑制剤供給系と、
前記処理室内の基板に対して成膜ガスを供給する成膜ガス供給系と、
前記処理室内の基板を加熱するヒータと、
前記処理室内において、(a)第1温度下で、酸素非含有の金属元素含有膜を含む第1下地と酸素非含有の半金属元素含有膜を含む第2下地とを表面に有する基板に対して、前記吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面に吸着させる処理と、(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面に前記吸着抑制剤を吸着させた後の前記基板をアニールする処理と、(c)前記第2温度よりも低い第3温度下で、前記アニール後の前記基板に対して前記成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する処理と、を行わせるように、前記吸着抑制剤供給系、前記成膜ガス供給系、および前記ヒータを制御することが可能なよう構成される制御部と、
を有する基板処理装置。 - 基板が処理される処理室と、
前記処理室内の基板に対して吸着抑制剤を供給する吸着抑制剤供給系と、
前記処理室内の基板に対して成膜ガスを供給する成膜ガス供給系と、
前記処理室内の基板を加熱するヒータと、
前記処理室内において、(a)第1温度下で、第1下地と第2下地と第3下地とを表面に有する基板に対して、前記吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面と、前記第3下地の表面と、に吸着させる処理と、(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面と、前記第3下地の表面と、に前記吸着抑制剤を吸着させた後の前記基板をアニールする処理と、(c)前記第2温度よりも低い第3温度下で、前記アニール後の前記基板に対して前記成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する処理と、を行わせるように、前記吸着抑制剤供給系、前記成膜ガス供給系、および前記ヒータを制御することが可能なよう構成される制御部と、
を有する基板処理装置。 - (a)第1温度下で、酸素非含有の金属元素含有膜を含む第1下地と酸素非含有の半金属元素含有膜を含む第2下地とを表面に有する基板に対して、吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面に吸着させる手順と、
(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面に前記吸着抑制剤を吸着させた後の前記基板をアニールする手順と、
(c)前記第2温度よりも低い第3温度下で、前記アニール後の前記基板に対して成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する手順と、
をコンピュータによって基板処理装置に実行させるプログラム。 - (a)第1温度下で、第1下地と第2下地と第3下地とを表面に有する基板に対して、吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面と、前記第3下地の表面と、に吸着させる手順と、
(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面と、前記第3下地の表面と、に前記吸着抑制剤を吸着させた後の前記基板をアニールする手順と、
(c)前記第2温度よりも低い第3温度下で、前記アニール後の前記基板に対して成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する手順と、
をコンピュータによって基板処理装置に実行させるプログラム。
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