JP2019096888A - パルス化された低周波数rf電力による高選択性かつ低応力のカーボンハードマスク - Google Patents
パルス化された低周波数rf電力による高選択性かつ低応力のカーボンハードマスク Download PDFInfo
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
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- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0332—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their composition, e.g. multilayer masks, materials
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
- C23C16/505—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using radio frequency discharges
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
- C23C16/515—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using pulsed discharges
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- H01L21/02104—Forming layers
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- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/02274—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition in the presence of a plasma [PECVD]
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- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
Abstract
Description
実施形態は、プラズマ化学気相成長(PECVD)反応器において実施することができる。このような反応器は、多くの異なる形態をとり得る。様々な実施形態が、既存の半導体処理装置に適合し、具体的には、ラムリサーチ社(Lam Research Corporation)から入手可能なSequel(登録商標)またはVector(登録商標)反応チャンバなどのPECVD反応器である。様々な実施形態を、マルチステーションまたはシングルステーション・ツールで実施することができる。具体的な実施形態では、4ステーション成膜方式の300mm Lam Vector(登録商標)ツール、または6ステーション成膜方式の200mm Sequel(登録商標)ツールが使用される。
以下の例は、いくつかの実施形態の様々な側面について、さらに説明するために提示する。これらの例は、様々な側面について例示し、より明確に説明するために提示するものであって、限定するものではない。以下で記載する高周波(RF)電力レベルは、300mmウェハ用に構成された4ステーションのツールの場合のものである。
上記の実施形態は、明確な理解を目的として、ある程度詳細に記載したが、添付の請求項の範囲内でいくらかの変更および変形を実施することができることは明らかであろう。なお、本発明の実施形態のプロセス、システム、および装置を実現する数多くの代替的方法があることに留意すべきである。よって、本発明の実施形態は例示とみなされるべきであって、限定するものではなく、また、実施形態は、本明細書で提示した詳細に限定されるものではない。
上記の実施形態は、明確な理解を目的として、ある程度詳細に記載したが、添付の請求項の範囲内でいくらかの変更および変形を実施することができることは明らかであろう。なお、本発明の実施形態のプロセス、システム、および装置を実現する数多くの代替的方法があることに留意すべきである。よって、本発明の実施形態は例示とみなされるべきであって、限定するものではなく、また、実施形態は、本明細書で提示した詳細に限定されるものではない。
適用例1:アッシャブル・ハードマスクを形成する方法であって、
炭化水素前駆体ガスを含む処理ガスに半導体基板を暴露し、
高周波数(HF)成分と低周波数(LF)成分とを含むデュアル高周波(RF)プラズマ源により生成されるプラズマを用いて、プラズマ化学気相成長(PECVD)プロセスによって前記基板上にアッシャブル・ハードマスクを堆積させることを備え、
堆積中は、HF電力は一定である一方で、LF電力はパルス化される、方法。
適用例2:前記LF電力は、非ゼロ電力レベル間でパルス化される、請求項1に記載の方法。
適用例3:前記LF電力は、前記LF電力をオンとオフで切り替えることによりパルス化される、適用例1に記載の方法。
適用例4:LF RF電力の周波数は、約400kHzである、適用例1から3のいずれか一項に記載の方法。
適用例5:前記LF電力は、約2Hz〜約200Hzの間の周波数でパルス化される、適用例1から4のいずれか一項に記載の方法。
適用例6:前記LF電力は、約2Hz〜約10Hzの間の周波数でパルス化される、適用例1から5のいずれか一項に記載の方法。
適用例7:前記堆積されるハードマスクは、応力に対する弾性率の比が1である、適用例1から6のいずれか一項に記載の方法。
適用例8:前記堆積されるハードマスクは、酸化物層、窒化物層、またはポリシリコン層に対するエッチング選択性が約3.6〜4.4の間である、適用例1から7のいずれか一項に記載の方法。
適用例9:前記堆積されるハードマスクは、水素含有量が約15%未満である、適用例1から8のいずれか一項に記載の方法。
適用例10:前記アッシャブル・ハードマスクは、約275℃〜550℃の間の処理温度で堆積される、適用例1から9のいずれか一項に記載の方法。
適用例11:アモルファスカーボン層を形成する方法であって、
炭化水素前駆体ガスを含む処理ガスに半導体基板を暴露し、
高周波数(HF)成分と低周波数(LF)成分とを含むデュアル高周波(RF)プラズマ源により生成されるプラズマを用いて、プラズマ化学気相成長(PECVD)プロセスによって前記基板上にアモルファスカーボン層を堆積させることを備え、
堆積中は、HF電力は一定である一方で、LF電力はパルス化される、方法。
適用例12:前記LF電力は、非ゼロ電力レベル間でパルス化される、適用例11に記載の方法。
適用例13:前記LF電力は、前記LF電力をオンとオフで切り替えることによりパルス化される、適用例11に記載の方法。
適用例14:前記LF電力は、約2Hz〜約10Hzの間の周波数でパルス化される、適用例11から13のいずれか一項に記載の方法。
適用例15:半導体基板を処理するように構成されている装置であって、
(a)成長チャンバであって、
シャワーヘッドと、
高周波数(HF)成分と低周波数(LF)成分とを含むデュアル高周波(RF)プラズマ発生器と、
整合ネットワークと、
基板サポートと、
1つまたは複数のガス導入口と、を有する成長チャンバと、
(b)当該装置の動作を制御するためのコントローラであって、
炭化水素前駆体ガスを含む処理ガスに半導体基板を暴露し、
HF電力をオンに切り替え、
LF電力をパルス化し、
プラズマ化学気相成長(PECVD)プロセスによって前記基板上にアッシャブル・ハードマスクを堆積させるための機械可読命令を含む、コントローラと、を備え、
前記HF電力は一定である一方で、前記LF電力はパルス化される、装置。
Claims (15)
- アッシャブル・ハードマスクを形成する方法であって、
炭化水素前駆体ガスを含む処理ガスに半導体基板を暴露し、
高周波数(HF)成分と低周波数(LF)成分とを含むデュアル高周波(RF)プラズマ源により生成されるプラズマを用いて、プラズマ化学気相成長(PECVD)プロセスによって前記基板上にアッシャブル・ハードマスクを堆積させることを備え、
堆積中は、HF電力は一定である一方で、LF電力はパルス化される、方法。 - 前記LF電力は、非ゼロ電力レベル間でパルス化される、請求項1に記載の方法。
- 前記LF電力は、前記LF電力をオンとオフで切り替えることによりパルス化される、請求項1に記載の方法。
- LF RF電力の周波数は、約400kHzである、請求項1から3のいずれか一項に記載の方法。
- 前記LF電力は、約2Hz〜約200Hzの間の周波数でパルス化される、請求項1から4のいずれか一項に記載の方法。
- 前記LF電力は、約2Hz〜約10Hzの間の周波数でパルス化される、請求項1から5のいずれか一項に記載の方法。
- 前記堆積されるハードマスクは、応力に対する弾性率の比が1である、請求項1から6のいずれか一項に記載の方法。
- 前記堆積されるハードマスクは、酸化物層、窒化物層、またはポリシリコン層に対するエッチング選択性が約3.6〜4.4の間である、請求項1から7のいずれか一項に記載の方法。
- 前記堆積されるハードマスクは、水素含有量が約15%未満である、請求項1から8のいずれか一項に記載の方法。
- 前記アッシャブル・ハードマスクは、約275℃〜550℃の間の処理温度で堆積される、請求項1から9のいずれか一項に記載の方法。
- アモルファスカーボン層を形成する方法であって、
炭化水素前駆体ガスを含む処理ガスに半導体基板を暴露し、
高周波数(HF)成分と低周波数(LF)成分とを含むデュアル高周波(RF)プラズマ源により生成されるプラズマを用いて、プラズマ化学気相成長(PECVD)プロセスによって前記基板上にアモルファスカーボン層を堆積させることを備え、
堆積中は、HF電力は一定である一方で、LF電力はパルス化される、方法。 - 前記LF電力は、非ゼロ電力レベル間でパルス化される、請求項11に記載の方法。
- 前記LF電力は、前記LF電力をオンとオフで切り替えることによりパルス化される、請求項11に記載の方法。
- 前記LF電力は、約2Hz〜約10Hzの間の周波数でパルス化される、請求項11から13のいずれか一項に記載の方法。
- 半導体基板を処理するように構成されている装置であって、
(a)成長チャンバであって、
シャワーヘッドと、
高周波数(HF)成分と低周波数(LF)成分とを含むデュアル高周波(RF)プラズマ発生器と、
整合ネットワークと、
基板サポートと、
1つまたは複数のガス導入口と、を有する成長チャンバと、
(b)当該装置の動作を制御するためのコントローラであって、
炭化水素前駆体ガスを含む処理ガスに半導体基板を暴露し、
HF電力をオンに切り替え、
LF電力をパルス化し、
プラズマ化学気相成長(PECVD)プロセスによって前記基板上にアッシャブル・ハードマスクを堆積させるための機械可読命令を含む、コントローラと、を備え、
前記HF電力は一定である一方で、前記LF電力はパルス化される、装置。
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