JP7072399B2 - タングステン膜の成膜方法、成膜システム及び記憶媒体 - Google Patents
タングステン膜の成膜方法、成膜システム及び記憶媒体 Download PDFInfo
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- JP7072399B2 JP7072399B2 JP2018029006A JP2018029006A JP7072399B2 JP 7072399 B2 JP7072399 B2 JP 7072399B2 JP 2018029006 A JP2018029006 A JP 2018029006A JP 2018029006 A JP2018029006 A JP 2018029006A JP 7072399 B2 JP7072399 B2 JP 7072399B2
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- 229910052721 tungsten Inorganic materials 0.000 title claims description 135
- 239000010937 tungsten Substances 0.000 title claims description 134
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims description 133
- 238000000034 method Methods 0.000 title claims description 51
- 239000007789 gas Substances 0.000 claims description 420
- 238000012545 processing Methods 0.000 claims description 133
- 229910052710 silicon Inorganic materials 0.000 claims description 59
- 239000010703 silicon Substances 0.000 claims description 59
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 58
- 239000000758 substrate Substances 0.000 claims description 25
- 230000015572 biosynthetic process Effects 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 20
- YOUIDGQAIILFBW-UHFFFAOYSA-J tetrachlorotungsten Chemical compound Cl[W](Cl)(Cl)Cl YOUIDGQAIILFBW-UHFFFAOYSA-J 0.000 claims description 20
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 235000012431 wafers Nutrition 0.000 description 97
- 230000007246 mechanism Effects 0.000 description 45
- 238000012546 transfer Methods 0.000 description 42
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- 238000010899 nucleation Methods 0.000 description 10
- 230000006911 nucleation Effects 0.000 description 9
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000005229 chemical vapour deposition Methods 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 230000007723 transport mechanism Effects 0.000 description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 3
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- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910008423 Si—B Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- 229910000077 silane Inorganic materials 0.000 description 1
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- Electrodes Of Semiconductors (AREA)
Description
本実施形態では、複数の成膜装置による成膜システムにより、成膜を実施する場合を例に説明する。最初に、本実施形態に係る成膜システムについて説明する。図1は、実施形態に係る成膜システムの全体の概略構成の一例を示す図である。成膜システム100は、表面に保護膜として、例えば、AlO膜が形成された基板に、シリコン膜の成膜を行い、シリコン膜を置換して初期タングステン膜の成膜を行い、初期タングステン膜の上に主タングステン膜を成膜してタングステン膜を成膜するためのものである。本実施形態では、基板をシリコンウエハとした場合を例に説明する。
第1成膜装置101及び第2成膜装置102は、略同様の構成とされている。以下では、第1成膜装置101の構成について主に説明し、第2成膜装置102の構成については異なる部分を主に説明する。
次に、上記のように構成された成膜システム100を用いて行われる、タングステン膜の成膜方法について説明する。図4は、実施形態に係る成膜方法の各工程の流れの一例を示すフローチャートである。図5は、実施形態に係る成膜方法の各工程でのウエハの状態の一例を模式的に示した断面図である。
次に、第1成膜装置101がシリコン膜を成膜する流れについて説明する。図6は、実施形態に係るシリコン膜を成膜する際のガス供給シーケンスの一例を示す図である。
次に、第2成膜装置102が初期タングステン膜を成膜する流を説明する。図7は、実施形態に係る初期タングステン膜を成膜する際のガス供給シーケンスの一例を示す図である。
次に、本実施形態に係る成膜方法の作用及び効果について説明する。図8は、本実施形態に係るウエハの層構成の一例を示す図である。図8は、本実施形態に係る成膜方法により成膜されたウエハWの層構成の一例を示したものである。ウエハWは、シリコン(SiO2)層の上に、保護膜としてAlO層が形成され、AlO層の上に、密着性や反応抑制の観点から、シリコン膜(Si)が形成されている。そして、ウエハWは、シリコン膜の上に、初期タングステン膜(Init.W)が形成され、初期タングステン膜の上に、主タングステン膜(Main W)が形成されることで、低抵抗のタングステン膜が形成されている。
温度:250~550℃
圧力:1~100Torr
SiH4:100~1000sccm
B2H6ガス:100~1000sccm
キャリアガス(N2):100~10000sccm
パージガス(N2):500~30000sccm
時間:
SiH4ガス:0.05~20秒
パージ:0.05~20秒
B2H6ガス:0.05~20秒
パージ:0.05~20秒
温度:400~650℃
圧力:1~60Torr
WCl6ガス:50~1500mg/min
キャリアガス(N2):100~3000sccm
パージガス(N2):500~10000sccm
H2ガス:500~30000sccm
時間:
WCl6ガス:0.05~5秒
パージ:0.05~5秒
H2ガス:0.05~5秒
パージ:0.05~5秒
温度:250~550℃
圧力:0.1~20Torr
WF6ガス:100~500sccm
キャリアガス(N2):500~10000sccm
パージガス(N2):0~10000sccm
H2ガス:500~20000sccm
時間:
WF6ガス:0.05~15秒
パージ:0.05~15秒
H2ガス:0.05~15秒
パージ:0.05~15秒
温度:250~550℃
圧力:1~100Torr
WF6ガス:10~500sccm
キャリアガス(N2):500~10000sccm
パージガス(N2):0~10000sccm
H2ガス:500~20000sccm
SiH4ガス:10~1000sccm
時間:
WF6ガス:0.05~15秒
パージ:0.05~15秒
SiH4ガス:0.05~15秒
パージ:0.05~15秒
温度:250~550℃
圧力:0.1~20Torr
WF6ガス:100~500sccm
キャリアガス(N2):1000~10000sccm
パージガス(N2):0~10000sccm
H2ガス:500~20000sccm
時間:
WF6ガス:0.05~15秒
パージ:0.05~15秒
H2ガス:0.05~15秒
パージ:0.05~15秒
温度:400~650℃
圧力:1~600Torr
塩化タングステンガス(WCl5、WCl6):50~1500mg/min
キャリアガス(N2):500~3000sccm
パージガス(N2):1000~10000sccm
時間:
塩化タングステンガス(WCl5、WCl6):0.05~300秒
5 ガス供給機構
6 制御部
W ウエハ
100 成膜システム
101 第1成膜装置
102 第2成膜装置
103 第3成膜装置
Claims (10)
- 表面に保護膜が形成された基板を処理容器内に配置し、減圧雰囲気でSiH4ガスとB2H6ガスを交互に供給して前記基板にシリコン膜を成膜する工程と、
前記シリコン膜が形成された前記基板に対して塩化タングステンガスと水素ガスを交互に供給して初期タングステン膜を成膜する工程と、
前記初期タングステン膜が形成された前記基板に対してタングステン含有ガスを供給して主タングステン膜を成膜する工程と、
を有することを特徴とするタングステン膜の成膜方法。 - 表面に保護膜が形成された基板を処理容器内に配置し、減圧雰囲気でSiH4ガスとB2H6ガスを交互に供給して前記基板にシリコン膜を成膜する工程と、
前記シリコン膜が形成された前記基板に対して塩化タングステンガスのみを供給して初期タングステン膜を成膜する工程と、
前記初期タングステン膜が形成された前記基板に対してタングステン含有ガスを供給して主タングステン膜を成膜する工程と、
を有することを特徴とするタングステン膜の成膜方法。 - 前記塩化タングステンガスのみの供給は、間欠的に供給される
ことを特徴とする請求項2に記載のタングステン膜の成膜方法。 - 前記塩化タングステンガスは、WCl5、または、WCl6である
ことを特徴とする請求項1から3の何れか1つに記載のタングステン膜の成膜方法。 - 前記初期タングステン膜の膜厚は、0.5-6nmとする
ことを特徴とする請求項1から4の何れか1つに記載のタングステン膜の成膜方法。 - 前記シリコン膜の膜厚は、0.5-3nmとすることを特徴とする請求項1から5の何れか1つに記載のタングステン膜の成膜方法。
- 前記シリコン膜を成膜する工程と、前記初期タングステン膜を成膜する工程は、同一装置内で行なわれることを特徴とする請求項1から6の何れか1つに記載のタングステン膜の成膜方法。
- 保護膜が形成され、第1の処理容器内に配置された基板を減圧雰囲気で加熱しつつSiH4ガスとB2H6ガスを交互に供給して前記基板の表面に、シリコン膜を成膜する制御を行なう第1の制御部を有する第1成膜装置と、
前記シリコン膜が形成され、第2の処理容器内に配置された前記基板を減圧雰囲気で加熱しつつ塩化タングステンガスと水素ガスを交互に供給して前記シリコン膜上に、初期タングステン膜を成膜する制御を行う第2の制御部を有する第2成膜装置と、
前記初期タングステン膜が形成され、第3の処理容器内に配置された前記基板を減圧雰囲気で加熱しつつタングステン含有ガスを供給して前記初期タングステン膜上に、主タングステン膜を成膜する制御を行う第3の制御部を有する第3成膜装置と、
を備えたことを特徴とする成膜システム。 - 保護膜が形成され、第1の処理容器内に配置された基板を減圧雰囲気で加熱しつつSiH4ガスとB2H6ガスを交互に供給して前記基板の表面に、シリコン膜を成膜し、当該シリコン膜上に、塩化タングステンガスと水素ガスを交互に供給して初期タングステン膜を成膜する制御を行う第1の制御部を有する第1成膜装置と、
前記初期タングステン膜が形成され、第2の処理容器内に配置された前記基板を減圧雰囲気で加熱しつつ前記初期タングステン膜上に、タングステン含有ガスを供給して主タングステン膜を成膜する制御を行う第2の制御部を有する第2成膜装置と、
を備えたことを特徴とする成膜システム。 - コンピュータ上で動作し、成膜装置を制御するためのプログラムが記憶された記憶媒体
であって、前記プログラムは、実行時に、上記請求項1から請求項7の何れか1つに記載のタングステン膜の成膜方法が行われるように、コンピュータに前記成膜装置を制御させることを特徴とする記憶媒体。
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