JP5248025B2 - SrTiO3膜の成膜方法およびコンピュータ読取可能な記憶媒体 - Google Patents
SrTiO3膜の成膜方法およびコンピュータ読取可能な記憶媒体 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 55
- 238000003860 storage Methods 0.000 title claims description 32
- 229910002370 SrTiO3 Inorganic materials 0.000 title description 2
- 239000007789 gas Substances 0.000 claims description 173
- 239000002994 raw material Substances 0.000 claims description 100
- 229910004356 Ti Raw Inorganic materials 0.000 claims description 39
- 239000007800 oxidant agent Substances 0.000 claims description 37
- 229910002367 SrTiO Inorganic materials 0.000 claims description 36
- 239000000758 substrate Substances 0.000 claims description 26
- 230000001590 oxidative effect Effects 0.000 claims description 20
- 238000010926 purge Methods 0.000 claims description 18
- 230000005587 bubbling Effects 0.000 claims description 15
- 239000002904 solvent Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 8
- 229910052712 strontium Inorganic materials 0.000 claims description 8
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical group CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 7
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 5
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 description 90
- 238000010790 dilution Methods 0.000 description 29
- 239000012895 dilution Substances 0.000 description 29
- 239000012159 carrier gas Substances 0.000 description 23
- 239000004065 semiconductor Substances 0.000 description 22
- 239000006200 vaporizer Substances 0.000 description 21
- 230000015572 biosynthetic process Effects 0.000 description 14
- -1 amine compound Chemical class 0.000 description 11
- 239000011261 inert gas Substances 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 10
- 238000000231 atomic layer deposition Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 150000002466 imines Chemical class 0.000 description 7
- 125000003253 isopropoxy group Chemical group [H]C([H])([H])C([H])(O*)C([H])([H])[H] 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 230000008016 vaporization Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 238000009834 vaporization Methods 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 230000003028 elevating effect Effects 0.000 description 3
- 229910003087 TiOx Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- HLLICFJUWSZHRJ-UHFFFAOYSA-N tioxidazole Chemical compound CCCOC1=CC=C2N=C(NC(=O)OC)SC2=C1 HLLICFJUWSZHRJ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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Description
J.H.Leeら "Plasma enhanced atomiclayer deposition of SrTiO3 thin films with Sr(tmhd)2 and Ti(i-OPr)4" J. Vac. Scl. Technol. A20(5),Sep/Oct 2002
また、このような方法を実行させる制御プログラムが記憶されたコンピュータ読取可能な記憶媒体を提供することを目的とする。
図1は、本発明に係る成膜方法の実施に用いることができる成膜装置の概略構成を示す断面図である。図1に示す成膜装置100は、例えばアルミニウムなどにより円筒状あるいは箱状に成形された処理容器1を有しており、処理容器1内には、被処理基板である半導体ウエハWが載置される載置台3が設けられている。載置台3は厚さ1mm程度の例えばカーボン素材、窒化アルミニウムなどのアルミニウム化合物等により構成される。
まず、ゲートバルブ38を開にして搬入出口39から、半導体ウエハWを処理容器1内に搬入し、載置台3上に載置する。載置台3はあらかじめ加熱ランプ32により放出され透過窓30を透過した熱線により加熱されており、その熱により半導体ウエハWを加熱する。そして、希釈ガス供給源55から希釈ガスとして例えばArガスを100〜800mL/sec(sccm)の流量で供給しつつ、図示しない真空ポンプにより排気口36および排気管37を介して処理容器1内を排気することにより処理容器1内の圧力を39〜665Pa程度に真空排気する。この際の半導体ウエハWの加熱温度は、例えば200〜400℃に設定される。
<実施例1>
上記図1の装置において、ランプパワーを調節して、載置台の温度を成膜温度である270℃に設定し、搬送ロボットのアームを用いて処理容器内に200mmSiウエハを搬入し、SrTiO3膜を成膜した。Sr原料としてはC24H46N4Srを用い、これを150℃に加熱した容器に保持し、Arガスをキャリアガスとしてバブリング法で処理容器に供給した。Ti原料としてはTi(OiPr)4を用い、これを40℃に加熱した容器に保持し、同様にArガスをキャリアガスとしてバブリング法で処理容器に供給した。また、酸化剤としてはO3ガスとO2ガスを用いた。配管および処理容器の温度は155℃とした。そして、Siウエハをアームにより載置台に設置した後、希釈Arガスを300mL/min(sccm)の流量で30secフローさせつつ133Pa(1Torr)の圧力でSiウエハを成膜温度に昇温後、希釈ガスを同様の流量に維持しつつ、10secで圧力を成膜圧力である106Pa(0.8Torr)に制御し、上述のステップ1〜8により成膜を行った。
上記図1の装置において、ランプパワーを調節して、載置台の温度を成膜温度である340℃に設定し、搬送ロボットのアームを用いて処理容器内に200mmSiウエハを搬入し、SrTiO3膜を成膜した。Sr原料としてはC26H50N4Srを用い、これをオクタンに0.4mol/Lの濃度で溶解し、150℃に加熱した気化器にHeで圧送し、Arガスをキャリアガスとして気化して処理容器に供給した。Ti原料としてはTi(OiPr)4を用い、これを40℃に加熱した容器に保持し、Arガスをキャリアガスとしてバブリング法で処理容器に供給した。酸化剤としてはO3ガスとO2ガスを用いた。配管および処理容器の温度は155℃とした。そして、Siウエハをアームにより載置台に設置した後、希釈Arガスを300mL/min(sccm)の流量で30secの間、フローさせつつ133Pa(1Torr)の圧力でSiウエハを成膜温度に昇温後、希釈ガスを同様の流量に維持しつつ、10secで圧力を成膜圧力である106Pa(0.8Torr)に制御し、上述のステップ1〜8により成膜を行った。
<比較例1>
上記図1の装置において、ランプパワーを調節して、載置台の温度を成膜温度である320℃に設定し、搬送ロボットのアームを用いて処理容器内に200mmSiウエハを搬入し、SrTiO3膜を成膜した。Sr原料としてはSr(DPM)2を用い、これを200℃に加熱した容器に保持し、Arガスをキャリアガスとしてバブリング法で処理容器に供給した。Ti原料としてはTi(OiPr)4を用い、これを40℃に加熱した容器に保持し、同様にArガスをキャリアガスとしてバブリング法で処理容器に供給した。酸化剤としてはO3ガスを用いた。配管および処理容器の温度は180℃とした。そして、Siウエハをアームにより載置台に設置した後、希釈Arガスを300mL/min(sccm)の流量で30secフローさせつつ133Pa(1Torr)の圧力でSiウエハを成膜温度に昇温後、希釈ガスを同様の流量に維持しつつ、10secで圧力を成膜圧力である40Pa(0.3Torr)に制御し、上述のステップ1〜8により成膜を行った。
成膜温度を350℃とし、Sr原料であるSr(DPM)2をTHFに溶解して気化器で気化して供給し、原料容器と気化器を310℃に加熱し、成膜圧力を133Pa(1Torr)とした以外は、比較例1と同じ条件でSrTiO3膜を成膜した。SrTiO3膜の厚さを測定したところ、6nmと比較例1よりも大きいものの実施例よりも小さい膜厚であった。これは、気化温度が高く気化量は増加したが、配管や処理容器の温度が180℃のままであるため、Sr(DPM)2が配管や処理容器の壁部で再固化し、ウエハに到達する原料が少なくなったためと考えられる。
配管および処理容器の温度を320℃とした以外は比較例2と同じ条件でSrTiO3膜を成膜した。その結果、膜厚は12nmと実施例と同等となったが、配管および処理容器の温度を高くするために部材を耐熱性の高いものとする必要があり、樹脂バルブからオールメタルバルブ、処理容器材料をアルミニウムからステンレス鋼へ変更、シャワーヘッド材料をアルミニウムからハステロイに変更等、設備負担が過大となり、実現が困難であった。
例えば、上記実施形態では、ALD法を用いて成膜した場合について示したが、通常のCVD法によって成膜する場合にも適用可能である。また、成膜装置としてランプ加熱で被処理基板を加熱するものを示したが、抵抗加熱ヒータで加熱するものであってもよい。さらに、上記実施形態では被処理基板として半導体ウエハを用いた場合を示したが、半導体ウエハに限らず、FPD用ガラス基板等の他の基板を用いてもよい。
3;載置台
32;加熱ランプ
40;シャワーヘッド
50,50′;処理ガス供給機構
52,52′;Sr原料貯留部
53,53′;Ti原料貯留部
54,54′;酸化剤供給源
90;プロセスコントローラ
92;記憶部
100;成膜装置
101;気化器
Claims (8)
- 処理容器内に基板を配置し、基板を加熱し、Sr原料とTi原料と酸化剤とを気体状で前記処理容器内に導入し、加熱された基板上でこれらガスを反応させ、基板上にSrTiO3膜を成膜するSrTiO3膜の成膜方法であって、
前記Sr原料として、C 24 H 46 N 4 SrまたはC 26 H 50 N 4 Srで表される化合物を用いることを特徴とするSrTiO3膜の成膜方法。 - 処理容器内に基板を配置し、基板を加熱し、気体状のTi原料を前記処理容器内に導入して基板上にTiを吸着させる工程と、気体状の酸化剤を前記処理容器内に導入してTi膜を酸化させる工程と、気体状のSr原料を前記処理容器内に導入して従前の膜の上にSrを吸着させる工程と、気体状の酸化剤を前記処理容器内に導入してSrを酸化させる工程とを順次行い、これらを1サイクルとして複数サイクル繰り返して基板上にSrTiO3膜を成膜するSrTiO3膜の成膜方法であって、
前記Sr原料として、C 24 H 46 N 4 SrまたはC 26 H 50 N 4 Srで表される化合物を用いることを特徴とするSrTiO3膜の成膜方法。 - 前記各工程の間に前記処理容器をパージする工程を有することを特徴とする請求項2に記載のSrTiO3膜の成膜方法。
- 前記Sr原料は、100〜200℃に加熱された状態でバブリングにより供給されることを特徴とする請求項1から請求項3のいずれか1項に記載のSrTiO3膜の成膜方法。
- 前記Sr原料は、溶媒に溶解され、100〜200℃に気化器で加熱されて気化された状態で供給されることを特徴とする請求項1から請求項3のいずれか1項に記載のSrTiO3膜の成膜方法。
- 前記溶媒は長い直鎖の炭化水素または環状炭化水素であることを特徴とする請求項5に記載のSrTiO3膜の成膜方法。
- 前記溶媒はオクタンまたはシクロヘキサンであることを特徴とする請求項6に記載のSrTiO3膜の成膜方法。
- コンピュータ上で動作し、成膜装置を制御する制御プログラムが記憶されたコンピュータ読取可能な記憶媒体であって、前記制御プログラムは、実行時に、請求項1から請求項7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成膜装置を制御させることを特徴とするコンピュータ読取可能な記憶媒体。
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JP2007051374A JP5248025B2 (ja) | 2007-03-01 | 2007-03-01 | SrTiO3膜の成膜方法およびコンピュータ読取可能な記憶媒体 |
KR1020097018326A KR101156305B1 (ko) | 2007-03-01 | 2008-02-27 | SrTiO3막의 성막 방법 및 기억 매체 |
CN200880000105XA CN101542695B (zh) | 2007-03-01 | 2008-02-27 | SrTiO3膜的成膜方法 |
PCT/JP2008/053391 WO2008105451A1 (ja) | 2007-03-01 | 2008-02-27 | SrTiO3膜の成膜方法および記憶媒体 |
US12/529,356 US8361550B2 (en) | 2007-03-01 | 2008-02-27 | Method for forming SrTiO3 film and storage medium |
TW097107341A TW200902747A (en) | 2007-03-01 | 2008-03-03 | Method of forming srtio3 film and computer-readable recording medium |
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