JP7012613B2 - 成膜方法及び成膜装置 - Google Patents
成膜方法及び成膜装置 Download PDFInfo
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Description
本開示の一実施形態に係る成膜装置について説明する。成膜装置は、基板の一例である半導体ウエハ(以下「ウエハ」という。)上に、互いに反応する塩化チタン(TiCl4)ガスとアンモニア(NH3)ガスとを交互に供給し、ALD法により反応生成物である窒化チタン(TiN)の薄膜を成膜する装置である。
(第1の実施形態)
第1の実施形態に係る成膜方法について説明する。以下で説明する成膜方法は、制御部6が成膜装置の各部の動作を制御することにより実行される。図3は、第1の実施形態に係る成膜方法を示すフローチャートである。図4は、図3の成膜方法におけるカウンターガスの供給シーケンスを示す図である。
成膜工程S1は、処理容器1内にカウンターガスを連続的に供給しながら、複数種類の反応ガスの各々について、反応ガス供給路に設けられた貯留タンクに反応ガスを貯留して昇圧した後、貯留タンクから処理容器1内に吐出する動作を順番に行う工程である。
判定工程S2は、成膜工程S1が予め定められた回数(所定の回数)行われたか否かを判定する工程である。判定工程S2において成膜工程S1が所定の回数行われたと判定されると、成膜工程S1を終了してパージ工程S3を行う。一方、判定工程S2において成膜工程S1が所定の回数行われていないと判定されると、再び成膜工程S1を行う。なお、所定の回数は、成膜工程S1において成膜する膜の厚さ等に応じて定められ、例えば25回であってよい。
パージ工程S3は、反応ガス供給路に設けられた貯留タンクにパージガスを貯留して成膜工程S11における対応する貯留タンクの昇圧時の圧力よりも高い圧力に昇圧し、貯留タンクから処理容器1内に吐出する動作を複数回繰り返す工程である。
第2の実施形態に係る成膜方法について説明する。以下で説明する成膜方法は、制御部6が成膜装置の各部の動作を制御することにより実行される。図5は、第2の実施形態に係る成膜方法を示すフローチャートである。図6は、図5の成膜方法におけるカウンターガスの供給シーケンスを示す図である。
成膜工程S11は、第1の実施形態において説明した成膜工程S1と同様とすることができる。
判定工程S12は、成膜工程S11が予め定められた回数(所定の回数)行われたか否かを判定する工程である。判定工程S12において成膜工程S11が所定の回数行われたと判定されると、成膜工程S11を終了してクリーニング工程S13を行う。一方、判定工程S12において成膜工程S11が所定の回数行われていないと判定されると、再び成膜工程S11を行う。なお、所定の回数は、成膜工程S1において成膜する膜の厚さ等に応じて定められ、例えば1000回であってよい。
クリーニング工程S13は、処理容器1内にクリーニング用流体を供給し、処理容器1内のクリーニングを行う工程である。
パージ工程S14は、第1の実施形態において説明したパージ工程S3と同様とすることができる。
コンディショニング工程S15は、成膜工程S11を行うための調整(コンディショニング)を行う工程であり、例えば処理容器1内に成膜工程S11で使用する反応ガスと同じガスを供給し、処理容器1内にプリコート膜を形成する工程である。
(実施例1)
実施例1では、図1に示される成膜装置を用いて、前述の成膜工程S1、判定工程S2、及びパージ工程S3を繰り返し行った。即ち、実施例1では、パージ工程S3において処理容器1内に供給するカウンターガスの流量が、成膜工程S1において処理容器1内に供給するカウンターガスの流量よりも小さい処理条件を用いた。また、判定工程S2における所定の回数を25回とした。
比較例1では、パージ工程S3において処理容器1内に供給するカウンターガスの流量を、成膜工程S1において処理容器1内に供給するカウンターガスの流量と同一とした。なお、その他の点については、実施例1と同様の処理条件を用いた。
比較例2では、判定工程S2及びパージ工程S3を行うことなく成膜工程S1を連続して行った。なお、その他の点については、実施例1と同様の処理条件を用いた。
図7は、ウエハの処理枚数とパーティクルの数との関係を示す図である。図7中、横軸は成膜工程、ウエハの処理枚数(枚)、縦軸はパーティクルの数(個)である。図7では、実施例1の結果を「●」で示し、比較例1の結果を「○」で示し、比較例2の結果を「△」で示す。
51 カウンターガス供給路
52 塩化チタン供給路
53 アンモニア供給路
54 カウンターガス供給路
61 貯留タンク
62 貯留タンク
W ウエハ
Claims (7)
- 真空雰囲気である処理容器内の基板に対して互いに反応する複数種類の反応ガスを、反応ガスの種類ごとに設けられた反応ガス供給路とは別に設けられたカウンターガス供給路からカウンターガスを連続的に供給しながら、前記反応ガス供給路を介して順番に供給し、反応生成物を積層して薄膜を形成する成膜方法であって、
前記カウンターガスを連続的に供給しながら、複数種類の反応ガスの各々について、前記反応ガス供給路に設けられた貯留部に反応ガスを貯留して昇圧した後、前記貯留部から前記処理容器内に吐出する動作を順番に行う成膜工程と、
前記反応ガス供給路に設けられた前記貯留部にパージガスを貯留して前記成膜工程における対応する前記貯留部の昇圧時の圧力よりも高い圧力に昇圧し、前記貯留部から前記処理容器内に吐出する動作を複数回繰り返すパージ工程と、
を有し、
前記パージ工程において前記処理容器内に供給する前記カウンターガスの流量は、前記成膜工程において前記処理容器内に供給する前記カウンターガスの流量よりも小さい、
成膜方法。 - 前記パージ工程は、前記成膜工程が所定の回数行われるごとに行われる、
請求項1に記載の成膜方法。 - 前記処理容器内にクリーニング用流体を供給し、前記処理容器内のクリーニングを行うクリーニング工程と、
前記処理容器内に前記成膜工程で使用する前記反応ガスと同じガスを供給し、前記処理容器内にプリコート膜を形成するコンディショニング工程と、
を更に有し、
前記パージ工程は、前記クリーニング工程の後であって、前記コンディショニング工程の前に行われる、
請求項1又は2に記載の成膜方法。 - 前記パージガスにより昇圧された貯留部から、前記パージガスを前記処理容器内に吐出した後、前記パージガスによる前記貯留部内の次の昇圧のために前記貯留部の下流側のバルブを閉じるときの前記貯留部内の圧力は、前記パージガスによる前記貯留部内の昇圧時の圧力の80%以上90%以下に設定されている、
請求項1乃至3のいずれか一項に記載の成膜方法。 - 前記カウンターガスは、前記パージガスと同じガスである、
請求項1乃至4のいずれか一項に記載の成膜方法。 - 前記カウンターガスは、アルゴンガス又は窒素ガスである、
請求項1乃至5のいずれか一項に記載の成膜方法。 - 真空雰囲気である処理容器内の基板に対して互いに反応する複数種類の反応ガスを順番に供給し、反応生成物を積層して薄膜を形成する成膜装置であって、
前記反応ガスの種類ごとに設けられたガス供給路と、
前記ガス供給路に設けられ、ガスの貯留によりその内部を昇圧する貯留部と、
前記ガス供給路における前記貯留部の上流側及び下流側の各々に設けられたバルブと、
前記貯留部にパージガスを供給するパージガス供給部と、
前記ガス供給路とは別に設けられ、前記反応ガスの種類ごとに設けられ、カウンターガスを供給するカウンターガス供給路と、
制御部と、
を有し、
前記制御部は、
前記処理容器内に前記カウンターガス供給路から前記カウンターガスを連続的に供給しながら、複数種類の反応ガスの各々について、前記貯留部に反応ガスを貯留して昇圧した後、前記貯留部から前記処理容器内に吐出する動作を順番に行う成膜工程と、
前記処理容器内に、前記成膜工程において前記処理容器内に供給する流量よりも小さい前記カウンターガスを供給しながら、前記貯留部に前記パージガスを貯留して前記成膜工程における対応する前記貯留部の昇圧時の圧力よりも高い圧力に昇圧し、前記貯留部から前記処理容器内に吐出する動作を複数回繰り返すパージ工程と、
を実行する、
成膜装置。
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