JP7290634B2 - リアクタの処理バッチサイズを増加させるための方法および装置 - Google Patents
リアクタの処理バッチサイズを増加させるための方法および装置 Download PDFInfo
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Description
本出願は、出願の開示全体があらゆる目的のために本明細書に組み込まれる、2017年10月31日に出願された、名称を「METHODS AND APPARATUSES FOR INCREASING REACTOR PROCESSING BATCH SIZE」とする米国特許出願第15/799,679号に基づく優先権の利益を主張する。
効率的な反応チャンバの生産性を達成することは、半導体製作において望ましいことである。ウエハのバッチは、従来、反応チャンバに供給され、反応チャンバ内でウエハ上に処理(例えば、堆積)が施される。しかし、材料が標的を外れた標的外、すなわち、チャンバの様々な内側表面(例えば、反応チャンバの側壁)に意図せず堆積すると、例えばチャンバ内で処理中のウエハ上にそのような材料が剥がれ落ちる(フレーキングを起こす)ことによって、最終的な粒子生成に影響を及ぼす可能性がある。そのような標的外の材料のフレーキングは、処理中のウエハを汚染し、処理されたウエハのバッチの全体的な品質を低下させる可能性があるため、望ましくない。
図1は、本開示によるプロセスおよび装置を実施可能とする反応チャンバまたは処理チャンバを例示する簡略図を提示する。処理チャンバ102は、チャンバ壁103と、チャンバ床104と、チャンバ天井105とを含む。処理チャンバ102内には、基板107を載置する基板支持体106が位置決めされる。処理チャンバ102はまた、入口108と、排気出口109とを含む。いくつかの実施形態では、リモートプラズマ源110が処理チャンバ102の上方に設けられる。リモートプラズマ源110は、リモートプラズマ源内でプラズマを生成するためのプラズマ発生器(図示せず)を含む。プラズマ発生器は、プラズマを発生するための機器(例えば、コイル、電極など)を含んでいる。ここで言うプラズマは、誘導結合プラズマ(ICP)、容量結合プラズマ(CCP)、またはマイクロ波生成プラズマなどでもよい。リモートプラズマ源110は、複数のシャワーヘッド穴112を有するシャワーヘッド111によって処理チャンバ102から分離されている。リモートプラズマ源110は、リモートプラズマの発生に使用されるガスを供給するための入口113を有する。
図7は、プロセスチャンバ702を有する原子層堆積(ALD)プロセスステーション700の一実施形態の概略図である。プロセスステーション700は、特定の開示の実施形態を実施するために使用することができる。例えば、プロセスステーション700は、典型的には、原子層堆積(ALD)によって膜を基板上に堆積するために使用され得るが、特定の構成では、プロセスステーション700を、例えば、原子層エッチング(ALE)または原子層洗浄(ALC)を行い、パターニングスキームにおいて炭素含有材料をそれぞれエッチングまたは洗浄するために使用され得る。いくつかの実施形態では、プロセスステーション700は、ALE、ALCおよびALDに使用されても良い。あるいは、いくつかの実施形態では、マルチステーションツールのいくつかのプロセスステーションは、真空を破ることなくALCステーションとALDステーションとの間で基板が搬送され得るように、ALEまたはALCのステーションと、ALDのステーションとを含み得る。
前述の実施形態は、明確な理解のために多少詳しく説明されてきたが、一定の変更および修正が添付の特許請求の範囲の範囲内で実施されてもよいことは明らかであろう。本実施形態のプロセス、システム、および装置の実施には多くの別の方法があることに注意されたい。したがって、本実施形態は、限定ではなく例示と見なされるべきであり、それらの実施形態は本明細書に述べられる詳細に限定されるべきではない。
Claims (30)
- 反応チャンバのバッチサイズを増加させる方法であって、
(a)前記反応チャンバ内においてウエハのバッチの一部を処理し、前記処理は、前記反応チャンバの内側表面に少なくともいくらかの材料の標的外の堆積をもたらし、
(b)前記反応チャンバの内側表面に蓄積した前記標的外の堆積材料を安定化するためにバッチ間反応チャンバ処理を実行し、
(c)前記反応チャンバ内において前記ウエハのバッチの別の部分を処理すること
を備え、
(b)は、前記材料が規定の厚さまで前記反応チャンバの前記内側表面に蓄積した後、蓄積した前記材料をプラズマに曝露することを含む、方法。 - 請求項1に記載の方法において、さらに、
前記ウエハのバッチの処理が完了するまで(b)~(c)を繰り返すことを備える、方法。 - 請求項1に記載の方法において、
前記反応チャンバのバッチサイズは、反応チャンバ洗浄サイクルの間に前記反応チャンバにおいて処理可能なウエハの数である、方法。 - 請求項1に記載の方法において、さらに、
前記反応チャンバ内におけるバッチ処理の前に、前記反応チャンバの前記内側表面をシーズニングすることを備える、方法。 - 請求項4に記載の方法において、
前記反応チャンバの前記内側表面のシーズニングは、(a)または(c)の最中に前記ウエハのバッチ上への堆積に使用される材料と同じ材料のコーティングを施すことを含む、方法。 - 請求項1に記載の方法において、
(a)または(c)は、前記ウエハのバッチ内の1枚のウエハ上に材料を堆積することを含む、方法。 - 請求項4に記載の方法において、
前記シーズニングは、前記反応チャンバにウエハが存在しない間に、原子層堆積(ALD)によって前記反応チャンバの内側表面にコーティングを施すことを含む、方法。 - 請求項1に記載の方法において、さらに、
(d)(c)の完了後に前記反応チャンバの内側表面を洗浄することを備える、方法。 - 請求項2に記載の方法において、さらに、
(d)前記ウエハのバッチの処理が完了した後に前記反応チャンバの内側表面を洗浄することを備える、方法。 - 請求項1に記載の方法において、
(b)は、前記ウエハのバッチの総バッチ蓄積限界に対して規定の間隔で実行される、方法。 - 請求項10に記載の方法において、
前記総バッチ蓄積限界は、さらなる処理を行う前に前記反応チャンバの洗浄が要求され、処理が阻害される、前記反応チャンバの内側表面に蓄積した材料の厚さである、方法。 - 請求項10に記載の方法において、
前記規定の間隔は、経験的に決定される、方法。 - 請求項10に記載の方法において、
前記規定の間隔は、前記チャンバの内側表面への材料の蓄積が、前記材料のフレーキングならびにウエハ欠陥の発生および/または粒子の発生をもたらす弊害レベルとなる前に生じる、方法。 - 請求項1に記載の方法において、
(b)は、前記反応チャンバの前記内側表面に蓄積した前記材料に結合する膜を堆積することを含む、方法。 - 請求項14に記載の方法において、
前記膜の圧縮性は、無線周波数(RF)電力レベル、反応チャンバ圧力、またはRF処理時間からなる群から選択される1つまたは複数を調整することによって強化される、方法。 - 請求項1に記載の方法において、
プラズマ曝露は、前記反応チャンバの前記内側表面に堆積された膜へのプラズマ拡散を促進するために、1Torr~10Torrの範囲内の圧力で実行される、方法。 - 請求項1に記載の方法において、
前記プラズマは、前記反応チャンバ内のシャワーヘッドのフェースプレート上で点火される、方法。 - 請求項1に記載の方法において、さらに、
前記プラズマが前記反応チャンバ全体に均一に消散することを許容するために、パージを停止することを備える、方法。 - 請求項1に記載の方法において、
前記プラズマは、水素、ヘリウム、アルゴン、または窒素含有源からなる群から選択されるいずれか1つに由来する、方法。 - 請求項1に記載の方法において、
前記プラズマへの曝露によって、前記反応チャンバの前記内側表面に蓄積した前記材料上に200Å未満の膜を堆積する、方法。 - 請求項20に記載の方法において、
前記堆積された膜は、前記反応チャンバの前記内側表面上の前記材料を安定化する、方法。 - 請求項20に記載の方法において、
前記プラズマへの前記曝露によって、前記堆積された膜を緻密化し、前記反応チャンバの前記内側表面上の前記材料を安定化する、方法。 - 請求項15に記載の方法において、
前記膜の圧縮性は、2kw~7kwの範囲の無線周波数(RF)電力の利用、2torr~10torrの範囲の高圧の利用、または0.2秒~から10秒のRFプラズマ時間の使用からなる群から選択される方法によって増加される、方法。 - 請求項15に記載の方法において、さらに、
(d)前記反応チャンバを接地することを備える、方法。 - 請求項9に記載の方法において、
(d)を実行するために使用されるプラズマは、リモートプラズマ洗浄ユニットによって供給される、方法。 - 請求項25に記載の方法において、
前記リモートプラズマ洗浄ユニットは、前記反応チャンバと共に搭載される、方法。 - 請求項1に記載の方法において、
前記プラズマは、400kHzの周波数を有する、方法。 - 基板を処理するためのプラズマ処理装置であって、
反応チャンバであって、
チャンバの内側表面、
前記反応チャンバ内で基板を支持するための基板支持体、
前記反応チャンバから材料を除去するための排気ポート
を備える反応チャンバと、
リモートプラズマチャンバであって、
前記リモートプラズマチャンバ内でプラズマを生成するためのプラズマ発生器、
前記リモートプラズマチャンバにガスを供給するための入口、
前記リモートプラズマチャンバで生成されたプラズマを前記反応チャンバに供給するための出口、
コントローラであって、
(a)前記反応チャンバ内でウエハのバッチの一部を処理し、前記処理は、前記反応チャンバの内側表面に少なくともいくらかの材料の標的外の堆積をもたらし、
(b)前記反応チャンバの内側表面に蓄積した前記標的外の堆積材料を安定化するためにバッチ間反応チャンバ処理を実行し、(b)は、前記材料が規定の厚さまで前記反応チャンバの前記内側表面に蓄積した後、蓄積した前記材料をプラズマに曝露することを含み、
(c)前記反応チャンバ内において前記ウエハのバッチの別の部分を処理する
ための命令を実行するように構成されているコントローラ
を備えるリモートプラズマチャンバと
を備える、プラズマ処理装置。 - 請求項28に記載のプラズマ処理装置において、
前記リモートプラズマチャンバは、前記反応チャンバから離れている、プラズマ処理装置。 - 請求項28に記載のプラズマ処理装置において、
前記コントローラは、さらに、
(d)(c)の完了後に前記反応チャンバの前記内側表面を洗浄する
ための命令を実行するように構成されている、プラズマ処理装置。
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