JP7195106B2 - 成膜方法及び基板処理システム - Google Patents
成膜方法及び基板処理システム Download PDFInfo
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- JP7195106B2 JP7195106B2 JP2018193768A JP2018193768A JP7195106B2 JP 7195106 B2 JP7195106 B2 JP 7195106B2 JP 2018193768 A JP2018193768 A JP 2018193768A JP 2018193768 A JP2018193768 A JP 2018193768A JP 7195106 B2 JP7195106 B2 JP 7195106B2
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/28556—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic System by chemical means, e.g. CVD, LPCVD, PECVD, laser CVD
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Description
一実施形態の成膜方法について説明する。図1は、成膜方法の一例を示すフローチャートである。
上記の成膜方法を実現する基板処理システムについて、工程S10、工程S20及び工程S30を、真空搬送室を介して接続された別の処理容器内で行う場合を例に挙げて説明する。図3は、基板処理システムの構成例を示す概略図である。
次に、基板処理システムの動作の一例について、図3を参照して説明する。
図4を参照して、処理装置101の動作について説明する。まず、バルブ51e,53e,55e,57eが閉じられた状態で、ゲートバルブ12を開いて搬送機構(図示せず)によりウエハWを処理容器1内に搬送し、搬送位置にある載置台2に載置する。搬送機構を処理容器1内から退避させた後、ゲートバルブ12を閉じる。載置台2のヒータ21によりウエハWを所定の温度に加熱すると共に載置台2を処理位置まで上昇させ、処理空間38を形成する。また、排気機構42の圧力制御バルブ(図示せず)により処理容器1内を所定の圧力に調整する。
ウエハ温度:460~650℃
処理容器内圧力:3~5Torr(400~667Pa)
TiCl4ガス流量:150~300sccm
NH3ガス流量:3800~7000sccm
キャリアガス(N2ガス)流量:1000~6000sccm
また、処理装置101に高周波電源を設け、TDMAT及びArの混合ガスの供給とNH3、Ar及びH2の混合ガスの供給とをパージガスの供給を挟んで交互に繰り返すことにより、凹部内にTiN膜をコンフォーマルに形成してもよい。このとき、NH3、Ar及びH2の混合ガスはプラズマ化することが好ましい。この場合の好ましい成膜条件の一例は以下の通りである。
ウエハ温度:200~400℃
処理容器内圧力:1~5Torr(133~667Pa)
TDMAT/Ar流量:50~200sccm/1000~6000sccm
NH3/Ar/H2流量:500~1500sccm/500~5000sccm/500~5000sccm
高周波電力:300~1500W
(処理装置102の動作)
図5を参照して、処理装置102の動作について説明する。まず、バルブ51e,52e,53e,55e,57eが閉じられた状態で、ゲートバルブ12を開いて搬送機構(図示せず)によりウエハWを処理容器1内に搬送し、搬送位置にある載置台2に載置する。搬送機構を処理容器1内から退避させた後、ゲートバルブ12を閉じる。載置台2のヒータ21によりウエハWを所定の温度に加熱すると共に載置台2を処理位置まで上昇させ、処理空間38を形成する。また、排気機構42の圧力制御バルブ(図示せず)により処理容器1内を所定の圧力に調整する。
ウエハ温度:100~300℃
処理容器内圧力:0.5~5Torr(67~667Pa)
Cl2ガス流量:30~1000sccm
キャリアガス(N2ガス):1000~6000sccm
また、ガス供給機構5AとしてClF3ガス供給源を設け、処理容器1内にClF3ガスを供給することにより、凹部の内壁上部の絶縁膜の表面を露出させ、凹部内の底部にTiN膜を残存させるようにTiN膜をエッチングしてもよい。この場合の好ましいエッチング条件の一例は以下の通りである。
ウエハ温度:100~200℃
処理容器内圧力:0.5~5Torr(67~667Pa)
ClF3ガス流量:5~500sccm
キャリアガス(N2ガス):1000~6000sccm
(処理装置103の動作)
図6を参照して、処理装置103の動作について説明する。まず、バルブ61e~64e,66e~68eが閉じられた状態で、ゲートバルブ12を開いて搬送機構(図示せず)によりウエハWを処理容器1内に搬送し、搬送位置にある載置台2に載置する。搬送機構を処理容器1内から退避させた後、ゲートバルブ12を閉じる。載置台2のヒータ21によりウエハWを所定の温度に加熱すると共に載置台2を処理位置まで上昇させ、処理空間38を形成する。また、排気機構42の圧力制御バルブ(図示せず)により処理容器1内を所定の圧力に調整する。
ウエハ温度:450~650℃
処理容器内圧力:15~40Torr(2.0~5.3kPa)
WCl6ガス流量:3~30sccm
H2ガス流量:1000~9000sccm
キャリアガス(N2ガス)流量:1000~8000sccm
また、ガス供給機構6としてRu3(CO)12ガス供給機構を設け、Ru3(CO)12ガスを用いた熱CVD法により、凹部内の底部に残存するTiN膜の上にルテニウム膜を選択的に成長させてもよい。なお、Ru3(CO)12ガス供給機構は、例えば固体状のRu3(CO)12を収容して加熱可能な原料容器と、原料容器内にキャリアガスとしてのCOガスを供給可能なキャリアガス供給配管と、を有する。この場合の好ましい成膜条件の一例は以下の通りである。
ウエハ温度:100~250℃
処理容器内圧力:1~100mTorr(0.13~13.3Pa)
Ru3(CO)12ガス流量:1~5sccm
COガス流量:300~700sccm
(実験例)
次に、実験例について説明する。図7は、ルテニウム膜の選択成長の実験手順の説明図である。
200 真空搬送室
600 全体制御部
F1 基板
F2 絶縁膜
F3 下地膜
F4 金属膜
W ウエハ
Claims (9)
- 絶縁膜を表面に有する凹部が形成された基板に対し、前記凹部内に金属膜を埋め込む成膜方法であって、
前記凹部内に下地膜をコンフォーマルに形成する工程と、
ハロゲンガスを用いたプラズマレスのエッチングにより、前記凹部の内壁上部の前記絶縁膜の表面を露出させ、前記凹部内の底部に前記下地膜を残存させるように前記下地膜をエッチングする工程と、
前記凹部内の底部に残存する前記下地膜の上に金属膜を選択的に成長させる工程と、
を有する、
成膜方法。 - 前記下地膜をエッチングする工程は、供給律速状態で行われる、
請求項1に記載の成膜方法。 - 前記金属膜を選択的に成長される工程は、前記絶縁膜よりも前記下地膜に対するインキュベーションタイムが短いガスを供給することにより行われる、
請求項1又は2に記載の成膜方法。 - 前記下地膜をコンフォーマルに形成する工程と、前記下地膜をエッチングする工程と、前記金属膜を選択的に成長させる工程とは、同一の処理容器内で連続して行われる、
請求項1乃至3のいずれか一項に記載の成膜方法。 - 前記下地膜をコンフォーマルに形成する工程と、前記下地膜をエッチングする工程と、前記金属膜を選択的に成長させる工程とは、真空搬送室を介して接続された別の処理容器内で行われる、
請求項1乃至3のいずれか一項に記載の成膜方法。 - 前記下地膜をコンフォーマルに形成する工程は、チタン含有ガスを用いたALD法により行われる、
請求項1乃至5のいずれか一項に記載の成膜方法。 - 前記金属膜を選択的に成長させる工程は、タングステン含有ガス又はルテニウム含有ガスを用いたCVD法又はALD法により行われる、
請求項1乃至6のいずれか一項に記載の成膜方法。 - 絶縁膜を表面に有する凹部が形成された基板に対し、前記凹部内に金属膜を埋め込む成膜方法を実行する基板処理システムであって、
減圧状態で基板を搬送可能な搬送機構を内部に有する真空搬送室と、
前記真空搬送室に接続された第1の処理装置、第2の処理装置及び第3の処理装置と、
制御部と、
を備え、
前記制御部は、
前記搬送機構により前記基板を前記第1の処理装置に搬送し、前記第1の処理装置において前記凹部内に下地膜をコンフォーマルに形成する工程と、
前記搬送機構により前記基板を前記第1の処理装置から前記真空搬送室を介して前記第2の処理装置に搬送し、ハロゲンガスを用いたプラズマレスのエッチングにより、前記凹部の内壁上部の前記絶縁膜の表面を露出させ、前記凹部内の底部に前記下地膜を残存させるように前記下地膜をエッチングする工程と、
前記搬送機構により前記基板を前記第2の処理装置から前記真空搬送室を介して前記第3の処理装置に搬送し、前記凹部内の底部に残存する前記下地膜の上に金属膜を選択的に成長させる工程と、
をこの順序で実行するように、前記真空搬送室、前記第1の処理装置、前記第2の処理装置及び前記第3の処理装置を制御する、
基板処理システム。 - 絶縁膜を表面に有する凹部が形成された基板に対し、前記凹部内に金属膜を埋め込む成膜方法を実行する基板処理システムであって、
処理装置と、
制御部と、
を備え、
前記制御部は、
前記処理装置に基板を搬送し、前記処理装置において、
前記凹部内に下地膜をコンフォーマルに形成する工程と、
ハロゲンガスを用いたプラズマレスのエッチングにより、前記凹部の内壁上部の前記絶縁膜の表面を露出させ、前記凹部内の底部に前記下地膜を残存させるように前記下地膜をエッチングする工程と、
前記凹部内の底部に残存する前記下地膜の上に金属膜を選択的に成長させる工程と、
をこの順序で連続して実行するように、前記処理装置を制御する、
基板処理システム。
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