JP7431343B2 - 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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- JP7431343B2 JP7431343B2 JP2022548328A JP2022548328A JP7431343B2 JP 7431343 B2 JP7431343 B2 JP 7431343B2 JP 2022548328 A JP2022548328 A JP 2022548328A JP 2022548328 A JP2022548328 A JP 2022548328A JP 7431343 B2 JP7431343 B2 JP 7431343B2
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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Description
(a)表面に第1下地と第2下地とが露出した基板に対して、成膜阻害ガスを供給し、前記第1下地の表面に成膜阻害層を形成する工程と、
(b)前記第1下地の表面に前記成膜阻害層を形成した後の前記基板に対して、成膜ガスを供給し、前記第2下地の表面上に膜を形成する工程と、
(c)前記第2下地の表面上に前記膜を形成した後の前記基板に対して、ノンプラズマの雰囲気下で、前記成膜阻害層および前記膜と化学反応するハロゲン非含有物質を供給する工程と、
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、図5(a)~図5(d)を参照しながら説明する。なお、以下の説明において用いられる図面は、いずれも模式的なものであり、図面に示される、各要素の寸法の関係、各要素の比率等は、現実のものとは必ずしも一致していない。また、複数の図面の相互間においても、各要素の寸法の関係、各要素の比率等は必ずしも一致していない。
図1に示すように、処理炉202は温度調整器(加熱部)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(デバイス)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。
表面に第1下地としての下地200aと第2下地としての下地200bとが露出したウエハ200に対して、成膜阻害ガスを供給し、下地200aの表面に成膜阻害層310を形成するステップAと、
下地200aの表面に成膜阻害層310を形成した後のウエハ200に対して、成膜ガス(原料ガス、反応ガス、触媒ガス)を供給し、下地200bの表面上に膜320を形成するステップBと、
下地200bの表面上に膜320を形成した後のウエハ200に対して、ノンプラズマの雰囲気下で、成膜阻害層310および膜320と化学反応するハロゲン非含有物質を供給するステップ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。
その後、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。
ステップAでは、処理室201内のウエハ200、すなわち、表面に下地200aと下地200bとが露出したウエハ200に対して、成膜阻害ガスを供給し、下地200aの表面に、成膜阻害層310を形成する。
処理温度:室温(25℃)~500℃、好ましくは室温~250℃
処理圧力:1~2000Pa、好ましくは5~1000Pa
成膜阻害ガス供給流量:1~3000sccm、好ましくは1~500sccm
成膜阻害ガス供給時間:1秒~120分、好ましくは30秒~60分
不活性ガス供給流量(ガス供給管毎):0~20000sccm
が例示される。
処理温度:室温(25℃)~500℃、好ましくは室温~250℃
処理圧力:1~30Pa、好ましくは1~20Pa
不活性ガス供給流量(ガス供給管毎):500~20000sccm
不活性ガス供給時間:10~30秒
が例示される。
ステップAが終了した後、ステップBを行う。ステップBでは、処理室201内のウエハ200、すなわち、下地200aの表面に成膜阻害層310が形成された後のウエハ200に対して、成膜ガス(原料ガス、反応ガス、触媒ガス)を供給し、下地200bの表面上に膜を形成する。
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の表面に成膜阻害層310が形成された後のウエハ200に対して、原料ガスおよび触媒ガスを供給する。
処理温度:室温~200℃、好ましくは室温~120℃
処理圧力:133~1333Pa
原料ガス供給流量:1~2000sccm
原料ガス供給時間:1~60秒
触媒ガス供給流量:1~2000sccm
不活性ガス供給流量(ガス供給管毎):0~20000sccm
が例示される。
第1層が形成された後、処理室201内のウエハ200、すなわち、下地200bの表面に形成された第1層に対して、酸化剤等の反応ガスおよび触媒ガスを供給する。
処理温度:室温~200℃、好ましくは室温~120℃
処理圧力:133~1333Pa
反応ガス供給流量:1~2000sccm
反応ガス供給時間:1~60秒
触媒ガス供給流量:1~2000sccm
不活性ガス供給流量(ガス供給管毎):0~20000sccm
が例示される。
上述したステップB1,B2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(c)に示すように、ウエハ200の表面に露出した下地200a,200bのうち下地200bの表面に、膜320を選択的に形成することが可能となる。上述のサイクルは、複数回繰り返すことが好ましい。すなわち、1サイクルあたりに形成される第2層の厚さを所望の膜厚よりも薄くし、第2層を積層することで、膜320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ことが好ましい。
ステップBが終了した後、ステップCを行う。ステップCでは、処理室201内のウエハ200、すなわち、下地200bの表面上に膜320が形成された後のウエハ200に対して、ノンプラズマの雰囲気下で、成膜阻害層310および膜320と化学反応するハロゲン非含有物質を供給する。
処理温度:200~1000℃、好ましくは400~700℃
処理圧力:1~120000Pa、好ましくは1~13300Pa
ハロゲン非含有物質供給流量:1~30000sccm、好ましくは1~20000sccm
ハロゲン非含有物質供給時間:1~18000秒、好ましくは120~10800秒
不活性ガス供給流量(ガス供給管毎):0~20000sccm
が例示される。
パラレルポストトリートメントが完了した後、ノズル249a~249cのそれぞれから不活性ガスを処理室201内へ供給し、排気口231aより排気する。ノズル249a~249cより供給される不活性ガスは、パージガスとして作用し、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)。
その後、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つまたは複数の効果が得られる。
本態様におけるステップCは、以下に示す変形例のように変更することができる。特に説明がない限り、各変形例の各ステップにおける処理手順、処理条件は、上述の基板処理シーケンスの各ステップにおける処理手順、処理条件と同様とすることができる。なお、以下に示す変形例は、上述の基板処理シーケンスとは、ステップCだけが異なり、変形例におけるステップAおよびステップBは、上述の基板処理シーケンスにおけるそれらと同様である。よって、以下に示す変形例の説明では、ステップAおよびステップBの説明を省略する。
ステップCでは、下地200bの表面上に形成された膜320の改質処理により、膜320の組成比を変化させるようにしてもよい。
ステップCでは、下地200bの表面上に形成された膜320の改質処理により、膜320中へ、膜320中に含まれていない元素(以下、他元素とも称する)であってハロゲン非含有物質に含まれる元素を添加(ドープ、ドーピング)するようにしてもよい。すなわち、ステップCでは、ステップBにより形成された膜320中に、他元素をドーピングするようにしてもよい。このように、膜320中に、他元素をドーピングする処理を、他元素添加、他元素ドーピング、または、他元素ドープとも称する。
ステップCでは、下地200bの表面上に形成された膜320の改質処理により、膜320を、膜320とは化学構造(例えば、化学成分、化学組成、分子構造等)が異なる膜へ変化させるようにしてもよい。
ステップCでは、下地200bの表面上に形成された膜320の改質処理により、膜320の表面の一部(例えば、表層)を、膜320とは化学構造(例えば、化学成分、化学組成、分子構造等)が異なる材料へ変化させるようにしてもよい。
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。
(原料ガス+触媒ガス→反応ガス)×n
(原料ガス→反応ガス+触媒ガス)×n
(原料ガス→反応ガス)×n
Claims (21)
- (a)表面に第1下地と第2下地とを有する基板に対して、成膜阻害ガスを供給し、前記第1下地の表面に成膜阻害層を形成する工程と、
(b)前記第1下地の表面に前記成膜阻害層を形成した後の前記基板に対して、成膜ガスを供給し、前記第2下地の表面上に膜を形成する工程と、
(c)前記第2下地の表面上に前記膜を形成した後の前記基板に対して、ノンプラズマの雰囲気下で、前記成膜阻害層および前記膜と化学反応するハロゲン非含有物質を供給する工程と、
を有する基板処理方法。 - (c)を、前記第1下地の表面に形成された前記成膜阻害層の除去および無効化のうち少なくともいずれかの処理が可能であって、かつ、前記第2下地の表面上に形成された前記膜の改質処理が可能な条件下で行う請求項1に記載の基板処理方法。
- (c)では、前記ハロゲン非含有物質の作用により、前記第1下地の表面に形成された前記成膜阻害層の除去および無効化のうち少なくともいずれかの処理と、前記第2下地の表面上に形成された前記膜の改質処理と、を同時に並行して行う請求項1に記載の基板処理方法。
- 前記ハロゲン非含有物質は、酸化ガスを含む請求項1に記載の基板処理方法。
- 前記ハロゲン非含有物質は、酸素および水素含有ガス、酸素含有ガス、並びに、酸素含有ガス+水素含有ガスのうち1以上を含む請求項1に記載の基板処理方法。
- 前記ハロゲン非含有物質は、H2O、H2O2、O2、O3、O2+H2、O3+H2、O2+NH3、及び、O3+NH3のうち1以上を含む請求項1に記載の基板処理方法。
- 前記ハロゲン非含有物質は、窒化ガスを含む請求項1に記載の基板処理方法。
- 前記ハロゲン非含有物質は、窒素および水素含有ガスを含む請求項1に記載の基板処理方法。
- 前記ハロゲン非含有物質は、NH3、N2H4、N2H2、N3H8のうち1以上を含む請求項1に記載の基板処理方法。
- (c)では、前記改質処理により、前記膜中に含まれる不純物を除去する請求項2または3に記載の基板処理方法。
- (c)では、前記改質処理により、前記膜の組成比を変化させる請求項2または3に記載の基板処理方法。
- (c)では、前記改質処理により、前記膜中へ、前記膜中に含まれていない元素であって前記ハロゲン非含有物質に含まれる元素を添加する請求項2または3に記載の基板処理方法。
- (c)では、前記改質処理により、前記膜を、前記膜とは化学構造が異なる膜へ変化させる請求項2または3に記載の基板処理方法。
- (c)では、前記改質処理により、前記膜の表面の一部を、前記膜とは化学構造が異なる材料へ変化させる請求項2または3に記載の基板処理方法。
- (c)における前記基板の温度を、(b)における前記基板の温度以上とする請求項1に記載の基板処理方法。
- 前記成膜阻害ガスは炭化水素基含有ガスを含み、前記成膜阻害層の表面には炭化水素基終端が形成される請求項1に記載の基板処理方法。
- 前記成膜阻害ガスはフッ素含有ガスを含み、前記成膜阻害層の表面にはフッ素終端が形成される請求項1に記載の基板処理方法。
- (b)では、前記基板に対して、前記成膜ガスとして、原料ガスと、反応ガスと、を交互に供給するか、もしくは、前記基板に対して、前記成膜ガスとして、原料ガスと、反応ガスと、を交互に供給し、前記原料ガスおよび前記反応ガスのうち少なくともいずれかと一緒に触媒ガスを供給する請求項1に記載の基板処理方法。
- (a)表面に第1下地と第2下地とを有する基板に対して、成膜阻害ガスを供給し、前記第1下地の表面に成膜阻害層を形成する工程と、
(b)前記第1下地の表面に前記成膜阻害層を形成した後の前記基板に対して、成膜ガスを供給し、前記第2下地の表面上に膜を形成する工程と、
(c)前記第2下地の表面上に前記膜を形成した後の前記基板に対して、ノンプラズマの雰囲気下で、前記成膜阻害層および前記膜と化学反応するハロゲン非含有物質を供給する工程と、
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成膜阻害ガスを供給する成膜阻害ガス供給系と、
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に対してハロゲン非含有物質を供給するハロゲン非含有物質供給系と、
前記処理室内において、(a)表面に第1下地と第2下地とを有する基板に対して、前記成膜阻害ガスを供給し、前記第1下地の表面に成膜阻害層を形成する処理と、(b)前記第1下地の表面に前記成膜阻害層を形成した後の前記基板に対して、前記成膜ガスを供給し、前記第2下地の表面上に膜を形成する処理と、(c)前記第2下地の表面上に前記膜を形成した後の前記基板に対して、ノンプラズマの雰囲気下で、前記成膜阻害層および前記膜と化学反応する前記ハロゲン非含有物質を供給する処理と、を行わせるように、前記成膜阻害ガス供給系、前記成膜ガス供給系、および前記ハロゲン非含有物質供給系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)表面に第1下地と第2下地とを有する基板に対して、成膜阻害ガスを供給し、前記第1下地の表面に成膜阻害層を形成する手順と、
(b)前記第1下地の表面に前記成膜阻害層を形成した後の前記基板に対して、成膜ガスを供給し、前記第2下地の表面上に膜を形成する手順と、
(c)前記第2下地の表面上に前記膜を形成した後の前記基板に対して、ノンプラズマの雰囲気下で、前記成膜阻害層および前記膜と化学反応するハロゲン非含有物質を供給する手順と、
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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WO2019023001A1 (en) | 2017-07-23 | 2019-01-31 | Applied Materials, Inc. | METHODS FOR SELECTIVE DEPOSITION ON SILICON-BASED DIELECTRICS |
JP2019195059A (ja) | 2018-05-02 | 2019-11-07 | エーエスエム アイピー ホールディング ビー.ブイ. | 堆積および除去を使用した選択的層形成 |
WO2019229785A1 (ja) | 2018-05-28 | 2019-12-05 | 株式会社Kokusai Electric | 半導体装置の製造方法、基板処理装置およびプログラム |
WO2020016915A1 (ja) | 2018-07-17 | 2020-01-23 | 株式会社Kokusai Electric | 半導体装置の製造方法、基板処理装置およびプログラム |
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CN115868007A (zh) | 2023-03-28 |
KR20230038256A (ko) | 2023-03-17 |
US20230183864A1 (en) | 2023-06-15 |
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