JP6118149B2 - ルテニウム膜の形成方法および記憶媒体 - Google Patents
ルテニウム膜の形成方法および記憶媒体 Download PDFInfo
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- JP6118149B2 JP6118149B2 JP2013059021A JP2013059021A JP6118149B2 JP 6118149 B2 JP6118149 B2 JP 6118149B2 JP 2013059021 A JP2013059021 A JP 2013059021A JP 2013059021 A JP2013059021 A JP 2013059021A JP 6118149 B2 JP6118149 B2 JP 6118149B2
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- 238000000034 method Methods 0.000 title claims description 68
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 title claims description 63
- 229910052707 ruthenium Inorganic materials 0.000 title claims description 63
- 238000003860 storage Methods 0.000 title claims description 17
- 239000007789 gas Substances 0.000 claims description 206
- 150000003304 ruthenium compounds Chemical class 0.000 claims description 129
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 claims description 99
- 229910001925 ruthenium oxide Inorganic materials 0.000 claims description 66
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 38
- 239000001257 hydrogen Substances 0.000 claims description 37
- 229910052739 hydrogen Inorganic materials 0.000 claims description 37
- 238000005229 chemical vapour deposition Methods 0.000 claims description 34
- 238000010926 purge Methods 0.000 claims description 34
- 238000012545 processing Methods 0.000 claims description 29
- 239000000758 substrate Substances 0.000 claims description 28
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 25
- 229910001882 dioxygen Inorganic materials 0.000 claims description 25
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 20
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 150000001336 alkenes Chemical class 0.000 claims description 17
- 239000012495 reaction gas Substances 0.000 claims description 11
- 150000001412 amines Chemical class 0.000 claims description 10
- 150000002825 nitriles Chemical class 0.000 claims description 10
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 7
- 125000003277 amino group Chemical group 0.000 claims description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims description 7
- 125000002560 nitrile group Chemical group 0.000 claims description 7
- 239000007792 gaseous phase Substances 0.000 claims 1
- 239000012071 phase Substances 0.000 claims 1
- 230000009467 reduction Effects 0.000 description 41
- 239000002994 raw material Substances 0.000 description 25
- 230000008569 process Effects 0.000 description 22
- 238000011282 treatment Methods 0.000 description 19
- 230000005587 bubbling Effects 0.000 description 13
- 150000001875 compounds Chemical class 0.000 description 13
- 238000002441 X-ray diffraction Methods 0.000 description 12
- 238000000231 atomic layer deposition Methods 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- 239000003990 capacitor Substances 0.000 description 10
- 239000012528 membrane Substances 0.000 description 8
- 239000004065 semiconductor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 229910002367 SrTiO Inorganic materials 0.000 description 4
- 239000012159 carrier gas Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 238000011946 reduction process Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000011534 incubation Methods 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000003446 ligand Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- KHZGUWAFFHXZLC-UHFFFAOYSA-N 5-methylhexane-2,4-dione Chemical compound CC(C)C(=O)CC(C)=O KHZGUWAFFHXZLC-UHFFFAOYSA-N 0.000 description 1
- IGMOYJSFRIASIE-UHFFFAOYSA-N 6-Methylheptan-2,4-dione Chemical compound CC(C)CC(=O)CC(C)=O IGMOYJSFRIASIE-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229940125898 compound 5 Drugs 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000011066 ex-situ storage Methods 0.000 description 1
- ILPNRWUGFSPGAA-UHFFFAOYSA-N heptane-2,4-dione Chemical compound CCCC(=O)CC(C)=O ILPNRWUGFSPGAA-UHFFFAOYSA-N 0.000 description 1
- NDOGLIPWGGRQCO-UHFFFAOYSA-N hexane-2,4-dione Chemical compound CCC(=O)CC(C)=O NDOGLIPWGGRQCO-UHFFFAOYSA-N 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- GJYXGIIWJFZCLN-UHFFFAOYSA-N octane-2,4-dione Chemical compound CCCCC(=O)CC(C)=O GJYXGIIWJFZCLN-UHFFFAOYSA-N 0.000 description 1
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 description 1
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
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- H01L28/60—Electrodes
- H01L28/65—Electrodes comprising a noble metal or a noble metal oxide, e.g. platinum (Pt), ruthenium (Ru), ruthenium dioxide (RuO2), iridium (Ir), iridium dioxide (IrO2)
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Description
本発明はこのような知見に基づいて完成されたものである。
<ルテニウム膜の形成方法全般>
図1は、本発明のルテニウム膜の形成方法の工程を示すフローチャートである。
2C16H22O6Ru+39O2→2RuO2+22H2O↑+32CO2↑
2C16H22O6Ru+37O2→2Ru+22H2O↑+32CO2↑
この式は、上記酸化ルテニウム(RuO2)の生成反応と比較して供給される酸素の量が異なるだけである。つまり、上記(3)式のルテニウム化合物を用い、強酸化した場合には酸化ルテニウムが形成され、弱酸化した場合にはルテニウムが形成される。したがって、このルテニウム化合物を用いてルテニウム膜を形成するためには、強酸化されないように、酸素ガスの流量(分圧)を低くするか、または成膜圧力を低くする必要があり、ステップカバレッジおよび成膜レートが低くならざるを得ない。これに対して、酸化ルテニウムを形成する場合にはこのような制約はなく、ステップカバレッジ、成膜レート、およびスループットを高くすることができる。
RuO2+2H2→Ru+2H2O
次に、本発明の好ましい実施形態について詳細に説明する。
図7は、本発明の好ましい実施形態を実施するための処理装置の一例を示す模式図である。
ゲートバルブ25を開け、搬送装置(図示せず)によりウエハWを、搬入出口24を介してチャンバー1内に搬入し、サセプタ2上に載置する。
酸化ルテニウム(RuO2)膜の形成に際しては、チャンバー1内を排気装置23により排気してチャンバー1内を所定の圧力にし、サセプタ2を成膜温度に加熱し、ヒーター31aにより、例えば80〜200℃に加熱されている原料タンク31に配管32からキャリアガスとしてArガスを所定の流量で供給し、上記(1)式の構造を有するルテニウム化合物をバブリングにより気化させ、原料ガスとして、原料ガス送出配管36、第1の導入路11、シャワーヘッド10を介してチャンバー1内へ供給し、還元ガスとしてのO2ガスをO2ガス供給源42から分岐配管40a、還元ガス供給配管40、第2の導入路12、シャワーヘッド10を介してチャンバー1内に供給する。
次に、本発明の実験例について説明する。
最初の例では、Ru化合物として上記(3)式の構造のものを用い、還元ガスとしてO2ガスを用いてCVD法によりウエハ上にRuO2膜を形成し、このRuO2膜に水素を含有するRu化合物ガスとして、RuO2膜の形成の際と同様の(3)式のルテニウム化合物ガスを流量5mL/min(sccm)で、0〜300secの間で供給時間を変化させて供給して還元処理をおこなった。還元処理のウエハ温度は255℃とした。
なお、本発明は、上記実施の形態に限定されることなく種々変形可能である。例えば、上記実施の形態においては、酸化ルテニウム(RuO2)膜を形成する際に、主に上記(1)式のルテニウム化合物ガスとO2ガスとを用いてCVD法(ALD法を含む)により形成する例を示したが、上述したようにCVDの際のルテニウム化合物ガスの種類は限定されず、また、酸化ルテニウム(RuO2)膜を形成する手法はCVD法に限定されない。また、還元処理の際に用いる水素を含有するルテニウム化合物についても上記(1)式のルテニウム化合物ガスに限定されるものではなく、水素を含有していればよく、またCVDに用いる原料に限定されるものでもない。
2;サセプタ
5;ヒーター
10;シャワーヘッド
30;ガス供給機構
31;原料タンク
42;O2ガス供給源
50;制御部
51;プロセスコントローラ
53;記憶部
W;半導体ウエハ
Claims (14)
- 基板上に酸化ルテニウム膜を形成する工程と、
形成された前記酸化ルテニウム膜を還元してルテニウム膜とする工程とを有し、
前記酸化ルテニウム膜を還元する工程は、少なくとも、還元剤として水素を含有するルテニウム化合物ガスを供給することを含むことを特徴とするルテニウム膜の形成方法。 - 前記酸化ルテニウム膜を形成する工程は、ルテニウム化合物ガスを用いてCVD法により酸化ルテニウム膜を形成することを特徴とする請求項1に記載のルテニウム膜の形成方法。
- 前記酸化ルテニウム膜を形成する工程は、Ruに2個のβ−ジケトン、および、2個の、オレフィン、アミン、ニトリル、およびカルボニルから選ばれる基が配位した以下の(1)式の構造を有するルテニウム化合物を気相状態で基板上に供給し、かつ酸素ガスを基板上に供給して、これらの反応により基板上に酸化ルテニウム膜を形成することを特徴とする請求項2に記載のルテニウム膜の形成方法。
- 前記酸化ルテニウム膜を形成する工程は、前記ルテニウム化合物ガスと酸素ガスとを同時に供給することを特徴とする請求項3に記載のルテニウム膜の形成方法。
- 前記酸化ルテニウム膜を形成する工程は、前記ルテニウム化合物ガスと酸素ガスとをパージを挟んで交互的に供給することを特徴とする請求項3に記載のルテニウム膜の形成方法。
- 前記酸化ルテニウム膜を還元する工程において、還元剤として供給される水素を含有するルテニウム化合物ガスは、前記酸化ルテニウム膜を形成する際に用いるルテニウム化合物ガスと同じものであることを特徴とする請求項2から請求項5のいずれか1項に記載のルテニウム膜の形成方法。
- 前記酸化ルテニウム膜を還元する工程に用いる前記水素を含有するルテニウム化合物ガスは、Ruに2個のβ−ジケトン、および、2個の、オレフィン、アミン、ニトリル、およびカルボニルから選ばれる基が配位した以下の(1)式の構造を有することを特徴とする請求項1から請求項6のいずれか1項に記載のルテニウム膜の形成方法。
- 前記酸化ルテニウム膜を還元する工程は、還元剤として水素を含有するルテニウム化合物ガスを供給し、その後、前記水素を含有するルテニウム化合物ガスを分解する反応ガスを供給することを特徴とする請求項1から請求項7のいずれか1項に記載のルテニウム膜の形成方法。
- 前記酸化ルテニウム膜を還元する工程は、還元剤としての水素を含有するルテニウム化合物ガスと、前記水素を含有するルテニウム化合物ガスを分解する反応ガスとをパージを挟んで交互に複数回供給することを特徴とする請求項1から請求項7のいずれか1項に記載のルテニウム膜の形成方法。
- 基板上に酸化ルテニウム膜を形成する工程と、
形成された前記酸化ルテニウム膜を還元してルテニウム膜とする工程とを有し、
前記酸化ルテニウム膜を形成する工程は、Ruに2個のβ−ジケトン、および、2個の、オレフィン、アミン、ニトリル、およびカルボニルから選ばれる基が配位した以下の(1)式の構造を有するルテニウム化合物を気相状態で基板上に供給し、かつ酸素ガスを基板上に供給して、これらの反応により基板上に酸化ルテニウム膜を形成し、
前記酸化ルテニウム膜を還元する工程は、還元剤として以下の(1)式の構造を有するルテニウム化合物を用いることを特徴とするルテニウム膜の形成方法。
- 前記酸化ルテニウム膜を還元する工程は、還元剤として前記(1)式の構造を有するルテニウム化合物ガスを供給し、その後、酸素ガスを供給することを特徴とする請求項10に記載のルテニウム膜の形成方法。
- 前記酸化ルテニウム膜を還元する工程は、還元剤としての前記(1)式の構造を有するルテニウム化合物ガスと、酸素ガスとをパージを挟んで交互に複数回供給することを特徴とする請求項10に記載のルテニウム膜の形成方法。
- 前記酸化ルテニウム膜を還元する工程における前記(1)式の構造を有するルテニウム化合物ガスと、酸素ガスとの繰り返し供給回数は2〜500回であることを特徴とする請求項12に記載のルテニウム膜の形成方法。
- コンピュータ上で動作し、処理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13のいずれかのルテニウム膜の形成方法が行われるように、コンピュータに前記処理装置を制御させることを特徴とする記憶媒体。
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