JP6840051B2 - タングステン膜上へシリコン酸化膜を形成する方法および装置 - Google Patents
タングステン膜上へシリコン酸化膜を形成する方法および装置 Download PDFInfo
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- JP6840051B2 JP6840051B2 JP2017149959A JP2017149959A JP6840051B2 JP 6840051 B2 JP6840051 B2 JP 6840051B2 JP 2017149959 A JP2017149959 A JP 2017149959A JP 2017149959 A JP2017149959 A JP 2017149959A JP 6840051 B2 JP6840051 B2 JP 6840051B2
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- silicon
- silicon oxide
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims description 75
- 229910052721 tungsten Inorganic materials 0.000 title claims description 75
- 239000010937 tungsten Substances 0.000 title claims description 75
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims description 66
- 229910052814 silicon oxide Inorganic materials 0.000 title claims description 52
- 238000000034 method Methods 0.000 title claims description 42
- 239000007789 gas Substances 0.000 claims description 268
- 239000001301 oxygen Substances 0.000 claims description 49
- 229910052760 oxygen Inorganic materials 0.000 claims description 49
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 47
- 229910052710 silicon Inorganic materials 0.000 claims description 47
- 239000010703 silicon Substances 0.000 claims description 47
- 230000007246 mechanism Effects 0.000 claims description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 35
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 claims description 28
- 230000015572 biosynthetic process Effects 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000004065 semiconductor Substances 0.000 claims description 14
- 230000003647 oxidation Effects 0.000 claims description 13
- 238000007254 oxidation reaction Methods 0.000 claims description 13
- 238000000137 annealing Methods 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 11
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 10
- BIVNKSDKIFWKFA-UHFFFAOYSA-N N-propan-2-yl-N-silylpropan-2-amine Chemical compound CC(C)N([SiH3])C(C)C BIVNKSDKIFWKFA-UHFFFAOYSA-N 0.000 claims description 10
- 239000000460 chlorine Substances 0.000 claims description 10
- 229910052801 chlorine Inorganic materials 0.000 claims description 10
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 9
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 9
- 229910000077 silane Inorganic materials 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 4
- LXEXBJXDGVGRAR-UHFFFAOYSA-N trichloro(trichlorosilyl)silane Chemical compound Cl[Si](Cl)(Cl)[Si](Cl)(Cl)Cl LXEXBJXDGVGRAR-UHFFFAOYSA-N 0.000 claims description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 229910001882 dioxygen Inorganic materials 0.000 claims description 3
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 235000012431 wafers Nutrition 0.000 description 64
- 229910004298 SiO 2 Inorganic materials 0.000 description 54
- 239000010410 layer Substances 0.000 description 24
- 239000006185 dispersion Substances 0.000 description 17
- 239000010453 quartz Substances 0.000 description 14
- 125000006850 spacer group Chemical group 0.000 description 14
- 230000004888 barrier function Effects 0.000 description 12
- 238000010926 purge Methods 0.000 description 10
- 239000007800 oxidant agent Substances 0.000 description 9
- 238000005192 partition Methods 0.000 description 8
- 238000001039 wet etching Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- CGRVKSPUKAFTBN-UHFFFAOYSA-N N-silylbutan-1-amine Chemical compound CCCCN[SiH3] CGRVKSPUKAFTBN-UHFFFAOYSA-N 0.000 description 2
- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 2
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 2
- WZUCGJVWOLJJAN-UHFFFAOYSA-N diethylaminosilicon Chemical compound CCN([Si])CC WZUCGJVWOLJJAN-UHFFFAOYSA-N 0.000 description 2
- AWFPGKLDLMAPMK-UHFFFAOYSA-N dimethylaminosilicon Chemical compound CN(C)[Si] AWFPGKLDLMAPMK-UHFFFAOYSA-N 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001930 tungsten oxide Inorganic materials 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- UOERHRIFSQUTET-UHFFFAOYSA-N N-propyl-N-silylpropan-1-amine Chemical compound CCCN([SiH3])CCC UOERHRIFSQUTET-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000011553 magnetic fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
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Description
まず、本発明の一実施形態に係るタングステン膜上へのシリコン酸化膜の形成方法が適用される構造の一例について説明する。図1は、本発明の一実施形態に係るタングステン膜上へのシリコン酸化膜の形成方法が適用される3D−NAND型不揮発性半導体装置の製造過程におけるタングステン膜を形成した後の状態を示す断面図である。
次に、本発明の実施形態に係るタングステン膜上へのシリコン酸化膜の形成方法について説明する。ここでは、図1の状態のウエハWにおいて、スリット30の内側部分にスペーサSiO2膜を形成する場合について説明する。
WO3+Si+Heat → W(還元)+SiO2 (1)
(a)第1工程(ステップ4−1)
・プラズマALD
・Si含有ガス:アミノシラン(好ましくはDIPAS(商品名LTO520))
・酸化剤:酸素含有プラズマ(好ましくはO2ガスプラズマ)
・温度:室温付近(25〜35℃)
・圧力:1〜10Torr(133〜1333Pa)
・Si含有ガス供給時間:1〜10min
・酸化剤供給時間:1〜20min
・繰り返し数:5〜20回
・膜厚:1〜10nm
(b)第2工程(ステップ4−2)
・低圧ラジカル酸化(LPRO)を用いたALD
・Si含有ガス:塩素含有Si化合物ガス(好ましくはヘキサクロロジシラン(HCD)ガス)
・酸化剤:O2ガス+H2ガス(O2ガス流量/(O2ガス+H2ガス流量)=50〜90%)
・温度:700〜750℃
・圧力:1〜10Torr(133〜1333Pa)
・Si原料供給時間:1〜10min
・酸化剤供給時間:1〜10min
・繰り返し数:5〜100回
・膜厚:1〜100nm
(a)第1工程(ステップ4−1)
・熱ALD
・Si含有ガス:アミノシラン(好ましくはDIPAS(商品名LTO520))
・酸化剤:O3ガス
・温度:300〜350℃
・圧力:1〜10Torr(133〜1333Pa)
・Si原料供給時間:1〜10min
・酸化剤供給時間:1〜20min
・繰り返し数:5〜20回
・膜厚:1〜10nm
(b)第2工程(ステップ4−2)
・熱ALD
・Si含有ガス:アミノシランガス(好ましくはTDMAS)
・酸化剤:O3ガス
・温度:500〜550℃
・圧力:1〜10Torr(133〜1333Pa)
・Si原料供給時間:1〜10min
・酸化剤供給時間:1〜10min
・繰り返し数:5〜100回
・膜厚:1〜50nm
次に、上記実施形態に係るシリコン酸化膜の形成方法を実施するための処理装置について説明する。
まず、ステップ4を上記Case1により行うことができる処理装置の第1の例について説明する。図9は処理装置の第1の例を示す縦断面図、図10はその水平断面図である。
次に、ステップ4を上記Case2により行うことができる処理装置の第2の例について説明する。図11は処理装置の第2の例を示す縦断面図、図12はその水平断面図である。
以上、本発明の実施の形態について説明したが、この発明は、上記の実施形態に限定されることはなく、その趣旨を逸脱しない範囲で種々変形可能である。
14;タングステン膜
14a;自然酸化膜
41;Siシード層
42;SiO2膜
43;スペーサSiO2膜(ALD−SiO2膜)
43a;第1のALD−SiO2膜
43b;第2のALD−SiO2膜
100,100′;処理装置
120,120′;ガス供給機構
140;プラズマ生成機構
151;排気装置
152;加熱機構
160;制御部
W;半導体ウエハ(被処理体)
Claims (19)
- タングステン膜上へシリコン酸化膜を形成する方法であって、
表面に自然酸化膜が形成されたタングステン膜を有する被処理体を減圧下の処理容器内に配置された状態とする第1工程と、
前記タングステン膜にシリコン含有ガスを吸着させてシリコンシード層を形成する第2工程と、
次いで、前記被処理体をアニールして前記自然酸化膜と前記シリコンシード層との反応によりシリコン酸化膜を形成する第3工程と、
次いで、シリコン含有ガスと酸素活性種を用いたALDによりALDシリコン酸化膜を形成する第4工程と
を有する、方法。 - 前記第2工程で用いる前記シリコン含有ガスは、アミノシランガス、またはジシランガスを含む、請求項1に記載の方法。
- 前記第2工程で用いる前記シリコン含有ガスは、トリスジメチルアミノシランまたはジイソプロピルアミノシランを含む、請求項2に記載の方法。
- 前記第3工程は、不活性ガス雰囲気で、600〜700℃の範囲の温度で行う、請求項1から請求項3のいずれか1項に記載の方法。
- 前記第4工程は、前記シリコン含有ガスとして、塩素を含有するシラン系ガスおよびアミノシラン系ガスのいずれか、酸素活性種として、酸素ラジカルまたはオゾンガスを用いる、請求項1から請求項4のいずれか1項に記載の方法。
- 前記第4工程は、25〜350℃の低温成膜により第1のALDシリコン酸化膜を形成する第1ステップと、500〜750℃の中高温成膜により第2のALDシリコン酸化膜を形成する第2ステップとを有する、請求項1から請求項5のいずれか1項に記載の方法。
- 前記第4工程は、前記第1ステップを25〜35℃の範囲の温度で、前記シリコン含有ガスとしてアミノシラン系ガスを用い、前記酸素活性種として酸素プラズマにより生成された酸素ラジカルを用いて行い、前記第2ステップを700〜750℃の範囲の温度で、前記シリコン含有ガスとして塩素含有シラン系ガスを用い、前記酸素活性種として酸素ガスおよび水素ガスを用いた低圧ラジカル酸化におけるラジカルを用いて行う、請求項6に記載の方法。
- 前記第1ステップは、アミノシラン系ガスとしてジイソプロピルアミノシランガスを用いて行い、前記第2ステップは、塩素含有シラン系ガスとしてへキサクロロジシランガスを用いて行う、請求項7に記載の方法。
- 前記第4工程は、前記第1ステップを300〜350℃の範囲の温度で、前記シリコン含有ガスとしてアミノシラン系ガスを用い、前記酸素活性種としてオゾンガスを用いて行い、前記第2ステップを500〜550℃の範囲の温度で、前記シリコン含有ガスとしてアミノシラン系ガスを用い、前記酸素活性種としてオゾンガスを用いて行う、請求項6に記載の方法。
- 前記第1ステップは、アミノシラン系ガスとしてジイソプロピルアミノシランガスを用いて行い、前記第2ステップは、アミノシラン系ガスとしてトリスジメチルアミノシランガスを用いて行う、請求項9に記載の方法。
- 前記被処理体は、3D−NAND型不揮発性半導体装置を形成する半導体ウエハである、請求項1から請求項10のいずれか1項に記載の方法。
- タングステン膜上へシリコン酸化膜を形成する装置であって、
表面に自然酸化膜が形成されたタングステン膜を有する被処理体を収容する処理容器と、
前記処理容器内に所定のガスを供給するガス供給部と、
前記処理容器内を加熱する加熱機構と、
前記処理容器内を排気して減圧状態とする排気機構と、
前記ガス供給部、前記加熱機構、および前記排気機構を制御する制御部と
を具備し、
前記制御部は、
前記被処理体が前記処理容器内に配置された状態で、前記処理容器内が所定の減圧下に保持され、
前記処理容器内にシリコン含有ガスを供給して、前記タングステン膜にシリコン含有ガスを吸着させてシリコンシード層を形成し、
次いで、前記被処理体をアニールすることにより、前記自然酸化膜と前記シリコンシード層とを反応させてシリコン酸化膜を形成し、
次いで、シリコン含有ガスと酸素活性種を処理容器に交互に供給してALDによりALDシリコン酸化膜を形成するように、前記ガス供給部、前記加熱機構、および前記排気機構を制御する、装置。 - 前記制御部は、前記アニールが600〜700℃の範囲の温度で行われるように制御する、請求項12に記載の装置。
- 前記制御部は、前記ALDシリコン酸化膜において、25〜350℃の低温成膜により第1のALDシリコン酸化膜が形成され、500〜750℃の中高温成膜により第2のALDシリコン酸化膜が形成されるように制御する、請求項12または請求項13に記載の装置。
- 前記装置は、さらに酸素プラズマを生成する酸素プラズマ生成機構を有し、
前記制御部は、前記第1のALDシリコン酸化膜の形成を、
25〜35℃の範囲の温度で、前記シリコン含有ガスとしてアミノシラン系ガスを用い、前記酸素活性種として酸素プラズマにより生成された酸素ラジカルを用いて行い、前記第2のALDシリコン酸化膜の形成を、700〜750℃の範囲の温度で、前記シリコン含有ガスとして塩素含有シラン系ガスを用い、前記酸素活性種として酸素ガスおよび水素ガスを用いた低圧ラジカル酸化におけるラジカルを用いて行うように制御する、請求項14に記載の装置。 - 前記制御部は、前記第1のALDシリコン酸化膜を形成する際に、アミノシラン系ガスとしてジイソプロピルアミノシランガスを用い、前記第2のALDシリコン酸化膜を形成する際に、塩素含有シラン系ガスとしてへキサクロロジシランガスを用いるように制御する、請求項15に記載の装置。
- 前記制御部は、前記第1のALDシリコン酸化膜の形成を、300〜350℃の範囲の温度で、前記シリコン含有ガスとしてアミノシラン系ガスを用い、前記酸素活性種としてオゾンガスを用いて行い、前記第2のALDシリコン酸化膜の形成を、500〜550℃の範囲の温度で、前記シリコン含有ガスとしてアミノシラン系ガスを用い、前記酸素活性種としてオゾンガスを用いて行うように制御する、請求項14に記載の装置。
- 前記制御部は、前記第1のALDシリコン酸化膜を形成する際に、アミノシラン系ガスとしてジイソプロピルアミノシランガスを用い、前記第2のALDシリコン酸化膜を形成する際に、アミノシラン系ガスとしてトリスジメチルアミノシランガスを用いるように制御する、請求項17に記載の装置。
- コンピュータ上で動作し、タングステン膜上へシリコン酸化膜を形成する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、請求項1から請求項11のいずれかの方法が行われるように、コンピュータに前記装置を制御させる、記憶媒体。
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JP2019029582A (ja) | 2019-02-21 |
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