JP2020077753A - 処理方法及び基板処理装置 - Google Patents
処理方法及び基板処理装置 Download PDFInfo
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- JP2020077753A JP2020077753A JP2018210072A JP2018210072A JP2020077753A JP 2020077753 A JP2020077753 A JP 2020077753A JP 2018210072 A JP2018210072 A JP 2018210072A JP 2018210072 A JP2018210072 A JP 2018210072A JP 2020077753 A JP2020077753 A JP 2020077753A
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- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
Abstract
Description
まず、基板処理装置1の一例について、図1を参照しながら説明する。一実施形態にかかる基板処理装置1は、容量結合型の平行平板の基板処理装置であり、略円筒形の処理容器2を有している。処理容器2の内部は、プラズマによりエッチング処理や成膜処理等のプラズマ処理が行われる処理室となっている。処理容器2の内面は、アルマイト処理(陽極酸化処理)されている。
ウェハW上に形成される半導体デバイスの微細化が進むにつれて、配線又はコンタクト抵抗が増大している。そのため、配線及びコンタクト抵抗のばらつきがデバイス性能のばらつきに影響するようになってきており、そのばらつきを抑制することが重要になっている。
図2及び図3を参照して、一実施形態に係る基板の処理工程の一例について説明する。図2は、一実施形態に係る基板の処理工程の一例を示す。図3は、一実施形態に係る基板の処理方法の一例を示すフローチャートである。図3に示す各ステップの処理は、制御部40により制御される。
図2(a)は、初期状態のウェハW上の積層膜を示す。ウェハWは、シリコン基板100上に順に積層されたシリコン酸化膜102、SOC膜104(Spin On Carbon)、SOG膜106(Spin On Glass)、レジスト膜108を有する。
次に、ステップS2において、制御部40は、レジスト膜108をH2ガスのプラズマ又はHBrのプラズマによりトリートメントする。図2(b)では、H2ガス及びArガスを供給する例が示されている。これにより、レジスト膜108の表面をトリートメントし、パターン形状を良好にすることができる。ただし、ステップS2の処理は省略してもよい。
図3に戻り、次に、制御部40は、レジスト膜108のマスクパターンのCDサイズを均一にするために、堆積工程と除去工程とを繰り返し実行するサイクルステップを制御する。ステップS3の処理において、制御部40は、レジスト膜108の上面、側面及び底面(SOG膜106の上面)に堆積物を堆積させ(堆積工程)、レジスト膜108のマスクパターンの側面のテーパ角を増加(大きく)させる(図5のテーパ角参照)。テーパ角とは、マスクパターンの側面を通る接線とマスクパターン底部の通る接線によってなす角度である(図5のθ)。この結果、図2(c)に示すように、レジスト膜108の上面、側面及び底面に有機膜の保護膜110が形成される。
ステップS5において、制御部40は、サイクルステップを所定回数繰り返したと判定した場合、ステップS6において、SOG膜106をエッチングする。その結果、図2(e)に示すように、レジスト膜108のマスクパターンにSOG膜106がエッチングされ、CDサイズ(例えば、CD1,CD2)が均一なコンタクトホールが形成される。そして、制御部40は、更にSOC膜104、シリコン酸化膜102の順にエッチングする。これにより、図2(f)に示すように、シリコン酸化膜102にCDサイズが均一なコンタクトホールが形成される。次に、図3のステップS7において、制御部40は、ウェハWを処理容器2外に搬出し、本処理を終了する。
以上に説明した基板の処理方法における各工程のプロセス条件に付いて説明する。
(トリートメント工程)
まず、図3のステップS2のトリートメント工程のプロセス条件は以下である。
ただし、トリートメント工程では、上記ガスに限られず、HBrガス、Arガスを供給してもよい。
次に、ステップS3の堆積工程のプロセス条件は以下である。
ただし、堆積工程では、上記ガスに限られず、例えば、CH4ガスは、その他のハイドロカーボン(CH)ガス、ハイドロフルオロカーボン(CHF)ガス及びフルオロカーボン(CF)ガスの少なくとも一つを含むガスを使用してもよい。堆積工程で使用するガスを第1のガスといい、堆積工程では、第1のガスを用いてプラズマ処理が実行される。第1のガスは、H2ガスを含まなくてもよい。また、Arガスに替えてN2ガスやその他の不活性ガスを使用してもよい。
次に、ステップS4の除去工程のプロセス条件は以下である。
ただし、除去工程では、上記ガスに限られず、例えば、CO2ガスに替えてO2ガス、COガス、N2ガス、H2ガスを使用してもよい。また、CH4ガスは、その他のハイドロカーボン(CH)ガス、ハイドロフロロカーボン(CHF)ガス、フロロカーボン(CF)ガスであってもよい。
次に、ステップS6のエッチング工程のプロセス条件は以下である。
ただし、エッチング工程では、上記ガスに限られない。
堆積工程では、コンタクトホールの側面に堆積物を付着させる。このとき、堆積物は狭いホールよりも広いホールにより多く付着する(Loading効果)。本実施形態では、この堆積物のLoading効果を利用する。
図5の右側に示すように、マスクパターンの側面が垂直のときのテーパ角を90°とする。マスクパターンが逆テーパ形状になるときのテーパ角は90°よりも大きく(増加)、マスクパターンがテーパ形状になるときのテーパ角は90°よりも小さい(減少)と定義する。
次に、堆積工程におけるガス依存性について、図7及び図8を参照しながら説明する。図7及び図8は、一実施形態に係る堆積工程におけるガス依存性を示す実験結果の一例を示す。
次に、堆積工程における圧力依存性について、図9を参照しながら説明する。図9は、一実施形態に係る堆積工程における圧力依存性を示す実験結果の一例を示す。図9(a)のグラフは、処理容器2内の圧力を変動させたときのテーパ角の変化を示す。図9(b)は、処理容器2内の圧力を変動させたときのL−CDU(3σ)/CDの変化を示す。
次に、堆積工程における温度依存性について、図10を参照しながら説明する。図10は、一実施形態に係る堆積工程における温度依存性を示す実験結果の一例を示す。図10(a)のグラフは、ウェハの温度を変動させたときのテーパ角の変化を示す。図10(b)のグラフは、ウェハの温度を変動させたときのL−CDU(3σ)/CDの変化を示す。図10の線Lに示す堆積工程において使用したガスは、図9の線Lに示す堆積工程において使用したガスと同じであり、堆積工程においてArガス、CH3Fガスを使用した場合の堆積工程後のテーパ角とL−CDU(3σ)/CDを示す。
次に、基板処理のサイクルステップにおけるテーパ角の調整について、図11及び図12を参照しながら説明する。図11及び図12は、一実施形態に係る基板の処理方法におけるテーパ角の調整を説明するための図である。
85°≦(ΔθD−ΔθT)×N+θ0≦95°・・・(2)
2 処理容器
3 ステージ
10 静電チャック
10a チャック電極
11 エッジリング
12 基台
12a 冷媒流路
17 ゲートバルブ
20 シャワーヘッド
22 ガス導入口
23 ガス供給源
25 ガス供給孔
26 可変直流電源
30 直流電源
32、34 高周波電源
33、35 整合器
36 チラー
37 伝熱ガス供給源
38 排気装置
40 制御部
102 シリコン酸化膜
104 SOC膜
106 SOG膜
108 レジスト膜
110 保護膜
Claims (15)
- 被エッチング膜の上にパターン化されたマスク層に堆積物を堆積させる第1の工程と、
前記マスク層の一部又は前記堆積物の一部の少なくともいずれかを除去する第2の工程と、を有し、
前記第1の工程と前記第2の工程とを1回以上繰り返し、前記マスク層のパターンの側面のテーパ角を所望の角度にする、処理方法。 - 前記第1の工程は、前記堆積物を堆積させ、前記マスク層のパターンの側面のテーパ角を増加させ、
前記第2の工程は、前記堆積物の一部を除去し、前記マスク層のパターンの側面のテーパ角を減少させる、
請求項1に記載の処理方法。 - 前記式(1)が成り立つように、前記第1の工程と前記第2の工程とのプロセス条件を調整する、
請求項3に記載の処理方法。 - 調整する前記プロセス条件は、前記第1の工程及び前記第2の工程の処理時間、前記第1の工程のガスの種類、前記第1の工程の圧力及び前記第1の工程の温度の少なくともいずれかである、
請求項4に記載の処理方法。 - 前記第1の工程は、ハイドロカーボン(CH)、ハイドロフルオロカーボン(CHF)及びフルオロカーボン(CF)の少なくとも一つを含む第1のガスのプラズマによる処理である、
請求項1〜5のいずれか一項に記載の処理方法。 - 前記第1のガスは、更に水素(H2)ガスを含む、
請求項6に記載の処理方法。 - 前記第1のガスのH原子の含有量は、F原子の含有量よりも大きい、
請求項6又は7に記載の処理方法。 - 前記第1の工程の前に、前記マスク層をH2ガスのプラズマ又はHBrのプラズマによりトリートメントする処理を実行する工程を有する、
請求項1〜8のいずれか一項に記載の処理方法。 - 前記第1の工程と前記第2の工程とを所定の回数N繰り返した後、前記マスク層のパターンに前記被エッチング膜をエッチングする工程を有する、
請求項1〜9のいずれか一項に記載の処理方法。 - 前記第1の工程と前記第2の工程とを繰り返す回数が2以上の場合、前記回数がn回目の第1の工程と、n+1回目の第1の工程とのプロセス条件は同じである、
請求項1〜10のいずれか一項に記載の処理方法。 - 前記第1の工程と前記第2の工程とを繰り返す回数が2以上の場合、前記回数がn回目の第1の工程と、n+1回目の第1の工程とのプロセス条件は異なる、
請求項1〜10のいずれか一項に記載の処理方法。 - 前記第1の工程と前記第2の工程とを繰り返す回数が2以上の場合、前記回数がn回目の第2の工程と、n+1回目の第2の工程とのプロセス条件は同じである、
請求項1〜12のいずれか一項に記載の処理方法。 - 前記第1の工程と前記第2の工程とを繰り返す回数が2以上の場合、前記回数がn回目の第2の工程と、n+1回目の第2の工程とのプロセス条件は異なる、
請求項1〜12のいずれか一項に記載の処理方法。 - 処理容器と、前記処理容器内にて被エッチング膜の上にパターン化されたマスク層を有する基板の処理を制御する制御部とを有し、
前記制御部は、
前記マスク層に堆積物を堆積させる第1の工程と、前記マスク層の一部又は前記堆積物の一部の少なくともいずれかを除去する第2の工程とを1回以上繰り返し、前記マスク層のパターンの側面のテーパ角を所望の角度にするように制御する、基板処理装置。
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