JP2004331480A - SiOX PARTICLE, ITS PRODUCTION METHOD AND APPLICATION - Google Patents
SiOX PARTICLE, ITS PRODUCTION METHOD AND APPLICATION Download PDFInfo
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- JP2004331480A JP2004331480A JP2003132866A JP2003132866A JP2004331480A JP 2004331480 A JP2004331480 A JP 2004331480A JP 2003132866 A JP2003132866 A JP 2003132866A JP 2003132866 A JP2003132866 A JP 2003132866A JP 2004331480 A JP2004331480 A JP 2004331480A
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- 239000002245 particle Substances 0.000 title claims abstract description 37
- 229910052814 silicon oxide Inorganic materials 0.000 title claims description 125
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000843 powder Substances 0.000 claims abstract description 64
- 238000006243 chemical reaction Methods 0.000 claims abstract description 39
- 239000011856 silicon-based particle Substances 0.000 claims abstract description 39
- 230000001590 oxidative effect Effects 0.000 claims abstract description 36
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000015556 catabolic process Effects 0.000 claims abstract description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 9
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 8
- 238000007865 diluting Methods 0.000 claims abstract description 6
- 230000003647 oxidation Effects 0.000 claims abstract description 6
- 239000010408 film Substances 0.000 claims description 97
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 94
- 230000001681 protective effect Effects 0.000 claims description 22
- 230000008021 deposition Effects 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 12
- 229910052801 chlorine Inorganic materials 0.000 claims description 8
- 239000011229 interlayer Substances 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000005401 electroluminescence Methods 0.000 claims description 7
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 239000010409 thin film Substances 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims 1
- 239000000758 substrate Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 72
- 239000002994 raw material Substances 0.000 abstract description 15
- 238000007740 vapor deposition Methods 0.000 abstract description 7
- 238000009413 insulation Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000047 product Substances 0.000 description 9
- 239000011258 core-shell material Substances 0.000 description 8
- 229910004298 SiO 2 Inorganic materials 0.000 description 7
- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000000460 chlorine Substances 0.000 description 7
- 239000012535 impurity Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 6
- 229910001873 dinitrogen Inorganic materials 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 229910001882 dioxygen Inorganic materials 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910001120 nichrome Inorganic materials 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 239000003085 diluting agent Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229920006280 packaging film Polymers 0.000 description 2
- 239000012785 packaging film Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000007539 photo-oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 1
- 239000005052 trichlorosilane Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Physical Vapour Deposition (AREA)
- Formation Of Insulating Films (AREA)
Abstract
Description
【0001】
【発明の属する技術分野】
本発明は、高純度・超微粒SiOx粒子・粉末及びその製造方法、並びにこれらを用いてなる半導体の保護膜又は絶縁膜等に関する。
【0002】
【従来の技術】
SiOx粒子又は粉末はその高い蒸気圧を利用し、食品包装用フィルムや光学部品にSiOx質の蒸着膜を形成させるための蒸着原料として用いられている。たとえば、水蒸気、酸素ガスの透過を防止して食品の劣化を防ぐため、食品包装用フィルムにSiOx膜からなるガスバリア膜を形成する原料に用いられている。
【0003】
従来、SiOx粒子又は粉末の製造方法としては、シリカと金属シリコン及び/又は炭素とを含む混合原料を、少なくとも8×104Pa以上の非窒化性雰囲気下で高温処理してSiO含有ガスを生成させ、それを1000℃/秒以下の冷却速度で冷却する方法(特許文献1参照)、SiO2粉末を不完全燃焼炎中で加熱してSi蒸気を発生させ、それを亜酸化する方法(特許文献2参照)等、が知られている。
【0004】
【特許文献1】特開2001−158613号公報。
【0005】
【特許文献2】特開平5−213606号公報。
【0006】
前記の従来法で、SiOx粒子又は粉末の高純度化を行うには、原料の調製から製品の捕集までの間に不純物が混入しないようにしなければならない。しかしながら、原料の高純度化には精製等の特殊処理が必要となる問題がある。また、原料を加熱してSiO蒸気又はSi蒸気を発生させるには、1500〜2000℃程度での高温操作が必要となり、高純度原料を用いても、炉材等からNa、Al、Mg、Ca、Fe等の不純物が混入し、高純度SiOx粒子又は粉末を製造することが困難である。尚、本発明でいう「高純度」とは、Na、Fe、Al、Clの合計量が10ppm以下のことである。
【0007】
また、従来法のSiOx粒子又は粉末は、Si粒子をコア、SiOxをシェルとするようなコア・シェル構造は有しておらず、概ね均一な粒子又は粉末であり、蒸着原料として用いる場合には蒸気圧を高くするために通常、x値(O/Siモル比)が2.0よりも1.0に近いものが用いられる。従って蒸着膜も原料同様に、組成SiOyにおけるy値(O/Siモル比)は2.0よりも1.0に近くなる。但し蒸着膜においては、O/Si値が小さい(y値が2.0よりも1.0に近い)程絶縁性が低下するので、従来法の蒸着膜は絶縁性が充分ではなかった。蒸着膜の絶縁性を向上させるために、x値が2である二酸化珪素(SiO2)粉末を原料に使用する試みもなされたが、蒸着に必要なほどの高い蒸気圧を有するSiO2粉末は、これまで見出されていない。
【0008】
【発明が解決しようとする課題】
本発明は、上記状況に鑑み、いろいろな形態のSiOxを得るべく検討したところ、ある特定の条件下でSi粒子をコア、SiOxをシェルとするコア・シェル構造を有する高純度で超微粒なSiOx粒子とそれを含む粉末が得られること、そして、それを用いてPVDを行うときに、熱並びに光酸化性に優れるSiOy膜が得られ、更に、従来よりも電気絶縁性に優れるSiOz膜をも容易に得ることができるという新しい知見を得て、本発明に至ったものである。
【0009】
即ち、本発明の目的は、Si粒子をコア、SiOxをシェルとするコア・シェル構造を有する高純度・超微粒SiOx粒子・粉末を提供すること、また、前記原料を用いていろいろな保護膜や絶縁膜として利用し得るSiOy膜を提供すること、更に、良好な絶縁破壊電圧を有しシリコン集積回路におけるゲート酸化膜等を始めとするいろいろな用途に利用可能なSiOz膜を提供することにある。
【0010】
【課題を解決するための手段】
即ち、本発明は、Si粒子を内包していることを特徴とするSiOx(x=1.0〜2.0)粒子であり、好ましくは、粒径が50nm以下であることを特徴とする前記のSiOx粒子である。
【0011】
本発明は、前記のSiOx粒子を当該粉末の90質量%以上含有することを特徴とするSiOx粉末であり、好ましくは、前記のSiOx粒子を含有し、Si粒子が5〜50質量%、Si粒子を包囲するSiOxが95〜50質量%からなることを特徴とするSiOx粉末であり、更に好ましくは、比表面積値が10m2/g以上であり、Na、Fe、Al、Clの合計量が10ppm以下であることを特徴とする前記のSiOx粉末である。
【0012】
本発明は、反応容器内に、モノシランガスと、前記モノシランガスを酸化するための酸化性ガスと、必要に応じて両者を希釈するための希釈ガスと、を導入してSiOx粉末を製造する方法であって、モノシランガスと酸化性ガスとを交互に前記反応容器内に供給することを特徴とするSiOx粉末の製造方法であり、好ましくは、反応容器内を、圧力が10〜1000kPa、温度が500〜1000℃の条件とすることを特徴とする前記のSiOx粉末の製造方法である。
【0013】
本発明は、前記のSiOx粉末を、光照射することなく、PVD蒸着して得られることを特徴とするSiOy(y=1.2〜1.8)膜であり、好ましくは、PVD蒸着時に基材を加熱することなく得られたSiOy膜であって、Si粒子含有量が0.1〜5質量%であることを特徴とする前記のSiOy膜であり、シリコン集積回路における保護膜若しくは層間絶縁膜、化合物半導体集積回路における保護膜、又はエレクトロルミネッセンス素子の保護膜であることを特徴とする前記のSiOy膜である。
【0014】
加えて、本発明は、前記のSiOx粉末を用いて、PVD蒸着しながら、又はPVD蒸着後に、光照射して得られることを特徴とするSiOz(zは1.5以上2.0未満)膜であり、好ましくは、光照射が100℃以下で行われ、しかも当該光照射時に酸化を伴って得られたSiOz膜であって、当該膜の絶縁破壊電圧が4MV/cm以上であることを特徴とする前記のSiOz膜であり、シリコン集積回路におけるゲート酸化膜、保護膜若しくは層間絶縁膜、化合物半導体集積回路における保護膜、薄膜トランジスタのゲート酸化膜若しくは絶縁性被膜、又はエレクトロルミネッセンス素子の保護膜であることを特徴とする前記のSiOz膜である。
【0015】
【発明の実施の形態】
まず、本発明に係るSiOx粉末の製造方法について、説明する。
本発明は、原料にモノシランガスを用いることによって、低温反応が可能となるので、従来法におけるような炉材等からの不純物混入を極限まで低下させることができ、その結果、生成するSiOx粉の高純度化と超微粉化が可能となるものである。
【0016】
本発明において用いるモノシラン(SiH4)ガスは市販品を用いることができる。モノシランガスは、塩素を構成成分としていない点でトリクロルシラン等のシラン系ガスよりも環境に及ぼす負荷が低く、優れている。また、モノシランの酸化性ガス(以下、単に「酸化性ガス」という。)としては、酸素ガス、乾燥空気の他に、モノシランに対して酸化性を有する例えばNO2、CO2、H2O等のガスを用いることができる。これらの酸化性ガスは、不純物が極限まで除去されていることが好ましい。
【0017】
モノシランガスと酸化性ガスの反応は、圧力10〜1000kPaの非酸化性ガス雰囲気下、温度500〜1000℃で行わせることが好ましい。圧力が10kPa未満であると、生成したSiOx膜が反応容器壁面に付着成長し、排出部を閉塞するので長期操業が容易でなくなることがあるし、1000kPaをこえると、反応装置の耐圧を高めるのに大がかりな設備が必要になるうえ、不純物が増加する傾向となるからである。好ましい圧力は、50〜300kPaである。
【0018】
一方、反応場の温度が500℃未満であると主としてSiO2が生成し易く、また1000℃をこえると単体のSiが生成し易くなると共に、炉材等からの不純物がより多く混入する恐れが高くなることから、いずれの場合も高純度・超微粉SiOx粉の製造が容易でなくなる。前記温度範囲の中で、550〜950℃が好ましく、更に650〜850℃が一層好ましい範囲である。
【0019】
本発明において、モノシランガスと酸化性ガスは、一度にではなく、それぞれが別々の時期に交互に反応容器内へ導入される。これよってSi粒子を内包するSiOx粒子、条件によっては、Si粒子をコア、SiOxをシェルとするコア・シェル構造の粒子が形成される。その理由は、先ずモノシランガス導入時に、モノシランが熱分解してSi粒子のコアが形成され、その後、酸化性ガスが導入された際にSiコアの外周が酸化されてSiOxシェルが形成されるためであると考えられる。
【0020】
本発明において、モノシランガスと酸化性ガスの反応は、必要に応じて、非酸化性ガスからなる希釈ガスの存在下で行われる。これによって、生成したSiOx粉の容器壁への付着をより少なくすることができる。希釈ガス(以下、非酸化性ガスともいう)としては、アルゴン、ヘリウムのような不活性ガスが最適であるが、反応を妨げない範囲で、H2、N2、NH3、CO等を用いることもできる。酸化性ガスとして乾燥空気を用いた場合、非酸化性ガスと酸化性ガスの両方を用いたことになる。非酸化性ガスの量は、モノシランガス量と酸化性ガスの酸化反応に与る酸素量との合計量よりも多くすることが好ましく、モル比で2倍以上、特に10倍以上であることが好ましい。ここで、酸化性ガスの酸化反応に与る酸素量とは、たとえば乾燥空気の場合には、それに含まれる酸素量であり、NO2とCO2の場合は、それを構成する酸素原子分の酸素量である。
【0021】
反応容器としては、石英ガラス等の高純度材料で製作されたものが使用できる。その形状は、底付きのコップ形状とすることもできるが、管状が好ましく、その向きは縦型設置、横型設置のいずれであっても良い。反応容器の加熱方法については、抵抗加熱発熱体、高周波加熱、赤外輻射加熱等の手段を用いることができる。
【0022】
反応容器内で生成したSiOx粉は、非酸化性ガス及び副成ガスと共に系外に排出され、バッグフィルター等の従来公知の粉末回収装置を用いて回収される。
【0023】
本発明の製造方法においては、モノシランガスと酸化性ガスの比率を変えることによって、x値すなわちO/Siモル比の異なるSiOx粉を制御して製造できる。
【0024】
本発明に係るSiOx粒子のx値は1.0〜2.0である。x値が1.0未満であると、PVD等の蒸着原料としたときに、蒸着速度が低下し、蒸着温度をあげる必要が生じるので、望ましくなく、本発明者の実験的検討に基づけば、好ましいx値は1.2〜1.8である。尚、x値は、SiOx中のSiモル量をJIS−R;6124(炭化けい素質研削材の化学分析)に準じて測定し、また酸素モル量をO/N同時分析装置(例えばLECO社「TC−136」)を用いて測定し、それらのモル比から算出することができる。
【0025】
前記した通りに、本発明のSiOx粉の製造方法によって、Si粒子を内包し、またはSi粒子をコア、SiOxをシェルとするコア・シェル構造を有し、粒径が50nm以下のSiOx粒子、そして前記SiOx粒子を当該粉末の90質量%以上含有する、比表面積が10m2/g以上であり、Na,Fe,Al,Clの合計量が10ppm以下である高純度で超微粉のSiOx粉末を容易に得ることができる。更に、前記SiOx粉末は、前記特有な構造のSiOx粒子を含有し、Si粒子が5〜50質量%、Si粒子を包囲するSiOxが95〜50質量%からなるSiOx粉末をも得ることができる。
【0026】
本発明に係る高純度、超微粉のSiOx粉の粒径は、透過型電子顕微鏡(TEM)観察によって測定できる。またSiOx粉がSi粒子を内包すること、またはSi粒子をコア、SiOxをシェルとするコア・シェル構造を有することは、TEM観察並びにラマン分光分析におけるSi粒子に帰属されるピークの位置及び形態によって確認できる。SiOx粉に内包されるかコアとして存在するSi粒子の量は、SiOx粉を加熱したフッ化水素酸中で煮沸後、残留物をSi粒子とみなし、質量を測定して求められる。
【0027】
本発明のSiOx粉において、Na、Fe、Al、Clの合計量が10ppmをこえると、これを用いて層間絶縁膜等を形成した場合に、絶縁不良、腐食の原因となることがあるので好ましくなく、5ppm以下であることが一層好ましい。尚、これらの不純物は、ICP等の発光分析法によって測定することができる。また、比表面積が10m2/g未満であると、前述した通りに、蒸着開始温度が高くなることがある。比表面積は50m2/g以上であることが一層好ましい。
【0028】
本発明の高純度、超微粉のSiOxを蒸着原料に用いて、光照射することなくPVD蒸着すると、y=1.2〜1.8のSiOy膜が得られ、このSiOy膜は酸化されやすい特徴を有している。特に、前記SiOx粉末を原料にして、基材を加熱することなく得られたSiOy膜であって、Si粒子含有量が0.1〜5質量%であるSiOy膜は、そのものが適度の絶縁破壊特性を有していて、シリコン高集積回路における保護膜若しくは層間絶縁膜、化合物半導体集積回路における保護膜、又はエレクトロルミネッセンス素子の保護膜等に好適に用いることができると共に、後述する通りに、更に容易に酸化されて絶縁破壊特性が一層優れるSiOz膜(1.5≦z<2.0)を提供できる特徴を有している。y値は1.5以上、2.0未満に達する。SiOy膜中のSi粒子含有量は、X線光電子スペクトル(XPS)におけるSi2pスペクトルの、SiOyに帰属されるピークとSi粒子に帰属されるピークの強度比(面積比)より求められる。
【0029】
前記の酸化性に優れるSiOy膜がSiOx粉末を用いて容易に得られることの原因について、本発明者は、SiOx粒子中にSi粒子が内在されているが、この構造が蒸発後の蒸着膜中に取り残されるように蒸着が行われ、前記の構造が存在することにより、蒸着膜中のSi粒子が活性化されており、熱酸化或いは光酸化されやすいためであると考えている。
【0030】
つまり、本発明のSiOy膜は、蒸着後に例えば酸素を含む雰囲気中400℃で2時間程度加熱すること等によって、酸化の程度をさらに進めることも可能である。そして、SiOy膜は酸化の度合いが大きくなると、それにつれて絶縁性が向上する特徴を有している。
【0031】
また、本発明は、前述のSiOx粉末を蒸着原料に用い、蒸着中もしくは蒸着後に得られる蒸着膜に光照射を行うことにより得られるSiOz膜(1.5≦z<2.0)である。特に、前記光照射が100℃以下で酸化を現象を伴って行われた前記SiOz膜は、絶縁破壊電圧が4MV/cm以上の極めて優れた電気絶縁特性を有するので、シリコン集積回路におけるゲート酸化膜、保護膜若しくは層間絶縁膜、化合物半導体集積回路における保護膜、薄膜トランジスタのゲート酸化膜若しくは絶縁性被膜、又はエレクトロルミネッセンス素子の保護膜として好適に使用することができる特徴がある。
【0032】
【実施例】
以下、実施例、比較例をあげて更に詳細に本発明を説明する。
【0033】
(実施例1〜5、比較例1〜4)
図1に例示する装置を用いてSiOx粉末を作製した。
まず、モノシランガス、窒素ガス、酸素ガス(いずれも、純度が99.999質量%以上)を用意し、それぞれのガスを、質量流量計を通じて石英ガラス製反応容器(内径60mm×長さ1500mm)1に導入した。
モノシランガスは、石英ガラス製のモノシランガス導入管4(内径5mm)を通し、窒素ガスと混合して反応容器1内に吹き出すようにして供給した。また酸素ガスは、石英ガラス製の酸化性ガス導入管3(内径5mm)を通し、窒素ガスと混合して反応容器1内に吹き出すようにして供給した。この際、モノシランガス導入管4および酸化性ガス導入管3の途中にタイマーで動作する電磁式バルブ7を設け、(1)モノシランガスを2秒間導入、(2)ガス導入を2秒間遮断、(3)酸化性ガスを2秒間導入、(4)ガス導入を2秒間遮断のサイクルを繰り返して反応させた。
【0034】
ここで、反応容器1は、その外周を巻回させたニクロム線ヒーター2に通電を行い、所定の反応温度(表1参照)に保たれるように加熱されている。温度調整は、反応容器中央部中心に設置された熱電対で測温し、ニクロム線ヒーター2の電力を制御して行った。
【0035】
反応容器1内の圧力は、多くの実験では大気圧下とほぼ同等の101kPaで実施した。反応容器内の大気圧未満の減圧は、排出側に設けた真空ポンプで減圧しつつバルブの開度を調節することによって行い、大気圧をこえる加圧は、反応容器1の外側にステンレス製容器をかぶせ2重構造にして行った。この際、ニクロム線ヒーター2とステンレスの間には繊維質断熱材を埋め込むと共に、反応容器1とステンレスの間には、反応容器1内の圧力と同等になるように窒素ガスを導入し、反応容器1の内外でのガス圧を均衡させた。
【0036】
生成したSiOx粉は、副生ガス、窒素ガスと共に、排出管8から排出され、途中に設けられたバグフィルター9で回収された。回収した粉末について、SiOx粉のx値、比表面積、不純物を測定した。Si粒子の質量分率は、生成物を加熱したフッ化水素酸中で煮沸後、残留物をSi粒子とみなし、質量を測定して求めた。SiO2の質量分率は、生成物を真空中1100℃で加熱してSiOx分を揮発させた後の残留物を、さらに加熱したフッ化水素酸中で煮沸し、この時の質量減少分をSiO2とみなして求めた。SiOx分の質量分率は、全体の質量からSi粒子とSiO2の質量を差し引いて算出した。また、透過型電子顕微鏡(TEM)観察及びラマン分光分析を行い、粒径及び粒子内のSi粒子内包(Siコア)有無を確認した。それらの結果を表2に示す。
【0037】
反応容器1内の圧力を5kPaとした比較例3では、少量の生成物しか回収できず、大部分が反応容器の排出部に付着していた。また、回収粉末の色調も実施例で得られた薄茶色ないしは茶褐色に対し白いものであった。一方、反応容器1内の圧力を1200kPaに高めた比較例4では、比表面積、純度ともに目的とするものが得られなかった。
【0038】
【表1】
【0039】
【表2】
【0040】
(実施例6)
窒素ガスの代わりにアルゴンガスを用い、それ以外は実施例1と同様にして反応を行い、生成物を分析した結果を表2に示す。
【0041】
(実施例7)
モノシランガスおよび酸化性ガス導入の間隔を、(1)モノシランガスを1秒間導入、(2)ガス導入を1秒間遮断、(3)酸化性ガスを1秒間導入、(4)ガス導入を1秒間遮断のサイクルとし、それ以外は実施例1と同様にして反応を行い、生成物を分析した結果を表2に示す。
【0042】
(比較例5)
モノシランガスおよび酸化性ガスを、交互にではなく同時に反応容器に導入し、それ以外は実施例1と同様にして反応を行い、生成物を分析した結果を表2に示す。
【0043】
表1及び表2から、本発明の製造方法によって、Si粒子を内包し、またはSi粒子をコア、SiOxをシェルとするコア・シェル構造を有し、粒径が50nm以下のSiOx粒子が得られていること、また、比表面積が10m2/g以上で、Na、Fe、Al、Clの合計量が10ppm以下である高純度・超微粉SiOx(x=1.0〜2.0)粉が製造できるが明瞭である。
【0044】
(実施例8〜10、比較例6〜8)
実施例1、実施例6、実施例7、比較例1、比較例5のそれぞれのSiOx粉、並びに市販のSiO粉末(Merck製、Patinal 7725)を蒸着用原料として用い、圧力1.3×10−5Pa、蒸発温度1100℃で、温度45℃の砒化ガリウム(GaAs)単結晶ウェハー上に20分間蒸着を行い、厚さ約300nmの蒸着膜を形成させた。
【0045】
得られた膜に含まれるSi粒子の量を、X線光電子スペクトル(XPS)におけるSi2pスペクトルの、SiOyに帰属されるピークとSi粒子に帰属されるピークの強度比(面積比)より求めた。また膜の組成(SiOyにおけるy値)、並びに前記膜について、酸素を含む雰囲気中でハロゲンランプを用い室温で光を照射した後の組成(SiOzにおけるz値)を、XPSのSi2p、O1sピークの強度比から求めた。また光照射後の膜の絶縁破壊電圧を測定した。これらの結果を表3に示した。
【0046】
【表3】
【0047】
(実施例11、比較例9〜10)
実施例1、比較例5のSiOx粉、又比較例8で用いた市販のSiO粉末を蒸着用原料として用い、圧力1.3×10−5Pa、蒸発温度1100℃で、温度45℃の砒化ガリウム(GaAs)単結晶ウェハー上に20分間ハロゲンランプで光照射を行いながら蒸着を行って厚さ約300nmの蒸着膜を形成させた。得られた膜の組成(SiOzにおけるz値)をXPSのSi2p、O1sピークの強度比から求めた。また膜の絶縁破壊電圧を測定した。これらの結果を表3に示した。
【0048】
【発明の効果】
本発明によれば、Si粒子を内包し、またはSi粒子をコア、SiOxをシェルとするコア・シェル構造を有し、粒径が50nm以下、比表面積が10m2/g以上、Na、Fe、Al、Clの合計量が10ppm以下である高純度で超微粉のSiOx(x=1.0〜2.0)粉が提供される。
【0049】
本発明のSiOx粉は、これを用いてPVD蒸着するときに絶縁破壊電圧の高いSiOy膜を容易に得ることができるし、更に、前記SiOy膜は光照射により酸化して一層絶縁破壊電圧の高いSiOz膜を容易に形成することができる特徴を有している。
【0050】
本発明のSiOy膜、SiOz膜は、絶縁破壊電圧が極めて高いので、シリコン高集積回路におけるゲート酸化膜、保護膜若しくは層間絶縁膜、化合物半導体集積回路における保護膜、薄膜トランジスタのゲート酸化膜若しくは絶縁性被膜、又はエレクトロルミネッセンス素子の保護膜等のいろいろな用途に好適に使用できるので、非常に有用である。
【図面の簡単な説明】
【図1】本発明の実施例に係るSiOx粉末の製造に用いた反応装置概略図。
【符号の説明】
1 反応容器
2 ニクロム線ヒーター
3 酸化性ガス導入管
4 モノシランガス導入管
5 希釈ガス(非酸化性ガス)導入管
6 流量コントローラー
7 タイマーで動作する電磁式バルブ
8 排出管
9 バグフィルター[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a high-purity ultra-fine SiOx particle / powder, a method for producing the same, and a semiconductor protective film or insulating film using the same.
[0002]
[Prior art]
SiOx particles or powders are used as vapor deposition raw materials for forming vapor-deposited SiOx films on food packaging films and optical components by utilizing their high vapor pressure. For example, it is used as a raw material for forming a gas barrier film made of a SiOx film on a food packaging film in order to prevent permeation of water vapor and oxygen gas to prevent food deterioration.
[0003]
Conventionally, as a method for producing SiOx particles or powder, a mixed raw material containing silica, metallic silicon, and / or carbon is subjected to high-temperature treatment in a non-nitriding atmosphere of at least 8 × 10 4 Pa or more to generate an SiO-containing gas. (See Patent Document 1), a method of heating SiO 2 powder in an incomplete combustion flame to generate Si vapor, and sub-oxidizing it (Patent Document 1). Reference 2) is known.
[0004]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-158613.
[0005]
[Patent Document 2] JP-A-5-213606.
[0006]
In order to purify SiOx particles or powder by the above-mentioned conventional method, it is necessary to prevent impurities from being mixed between preparation of raw materials and collection of products. However, there is a problem that a high-purity raw material requires special treatment such as purification. In addition, in order to generate SiO vapor or Si vapor by heating the raw material, a high-temperature operation at about 1500 to 2000 ° C. is required. Even if a high-purity raw material is used, Na, Al, Mg, Ca , Fe and the like are mixed, and it is difficult to produce high-purity SiOx particles or powder. In the present invention, "high purity" means that the total amount of Na, Fe, Al, and Cl is 10 ppm or less.
[0007]
In addition, conventional SiOx particles or powders do not have a core-shell structure such as Si particles as a core and SiOx as a shell, and are generally uniform particles or powders. In order to increase the vapor pressure, one having an x value (O / Si molar ratio) closer to 1.0 than 2.0 is usually used. Therefore, the y value (O / Si molar ratio) in the composition SiOy is closer to 1.0 than 2.0 in the deposited film as in the raw material. However, as the O / Si value of the deposited film is smaller (the y value is closer to 1.0 than 2.0), the insulating property is reduced. Therefore, the insulating property of the conventional deposited film is not sufficient. Attempts have been made to use a silicon dioxide (SiO 2 ) powder having an x value of 2 as a raw material in order to improve the insulating properties of the deposited film. However, SiO 2 powder having a high vapor pressure necessary for vapor deposition has been used. , Has not been found so far.
[0008]
[Problems to be solved by the invention]
In view of the above situation, the present invention has been studied to obtain various forms of SiOx. Under certain conditions, a high-purity ultrafine SiOx having a core-shell structure in which Si particles are used as a core and SiOx is used as a shell is used. Particles and powders containing the particles can be obtained, and when PVD is performed using the particles, a SiOy film having excellent thermal and photooxidative properties can be obtained. The present inventors have obtained a new finding that they can be easily obtained, and have reached the present invention.
[0009]
That is, an object of the present invention is to provide high-purity, ultrafine SiOx particles and powder having a core-shell structure in which Si particles are used as a core and SiOx is used as a shell. An object of the present invention is to provide a SiOy film which can be used as an insulating film, and a SiOz film which has a good dielectric breakdown voltage and can be used for various uses such as a gate oxide film in a silicon integrated circuit. .
[0010]
[Means for Solving the Problems]
That is, the present invention provides SiOx (x = 1.0 to 2.0) particles containing Si particles, and preferably has a particle size of 50 nm or less. Are SiOx particles.
[0011]
The present invention is a SiOx powder characterized by containing the above-mentioned SiOx particles in an amount of 90% by mass or more of the powder, preferably containing the above-mentioned SiOx particles, 5 to 50% by mass of Si particles, and Si particles. Is a SiOx powder characterized by comprising 95 to 50% by mass of SiOx, more preferably having a specific surface area of 10 m 2 / g or more, and a total amount of Na, Fe, Al, and Cl of 10 ppm. It is the above-mentioned SiOx powder characterized by the following.
[0012]
The present invention is a method for producing SiOx powder by introducing a monosilane gas, an oxidizing gas for oxidizing the monosilane gas, and a diluting gas for diluting both as necessary, into a reaction vessel. A monosilane gas and an oxidizing gas are alternately supplied into the reaction vessel, wherein the pressure is preferably 10 to 1000 kPa and the temperature is 500 to 1000 kPa in the reaction vessel. The method for producing SiOx powder described above, wherein the temperature is set to ° C.
[0013]
The present invention is a SiOy (y = 1.2 to 1.8) film obtained by subjecting the above-mentioned SiOx powder to PVD deposition without irradiating light. A SiOy film obtained without heating a material, wherein the content of Si particles is 0.1 to 5% by mass, wherein the SiOy film is a protective film or an interlayer insulating film in a silicon integrated circuit. The SiOy film described above, which is a film, a protective film in a compound semiconductor integrated circuit, or a protective film of an electroluminescence element.
[0014]
In addition, the present invention provides a SiOz (z is 1.5 or more and less than 2.0) film obtained by irradiating light using the above-mentioned SiOx powder during PVD deposition or after PVD deposition. Preferably, the SiOz film is irradiated with light at a temperature of 100 ° C. or lower, and is oxidized during the light irradiation, and has a dielectric breakdown voltage of 4 MV / cm or more. A gate oxide film, a protective film or an interlayer insulating film in a silicon integrated circuit, a protective film in a compound semiconductor integrated circuit, a gate oxide film or an insulating film of a thin film transistor, or a protective film of an electroluminescence element. The above-described SiOz film is characterized in that there is a.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
First, a method for producing a SiOx powder according to the present invention will be described.
According to the present invention, the use of monosilane gas as a raw material enables a low-temperature reaction, so that the contamination of impurities from a furnace material or the like as in the conventional method can be reduced to the utmost, and as a result, a high SiOx powder generated can be obtained. Purification and ultra-fine pulverization become possible.
[0016]
As the monosilane (SiH 4 ) gas used in the present invention, a commercially available product can be used. A monosilane gas is superior to a silane-based gas such as trichlorosilane in that it does not use chlorine as a component, and thus has a lower load on the environment. Examples of the oxidizing gas of monosilane (hereinafter, simply referred to as “oxidizing gas”) include not only oxygen gas and dry air, but also NO 2 , CO 2 , H 2 O, and the like having an oxidizing property to monosilane. Can be used. These oxidizing gases preferably have impurities removed to the utmost.
[0017]
The reaction between the monosilane gas and the oxidizing gas is preferably performed at a temperature of 500 to 1000 ° C. in a non-oxidizing gas atmosphere at a pressure of 10 to 1000 kPa. If the pressure is less than 10 kPa, the formed SiOx film adheres and grows on the wall surface of the reaction vessel and closes the discharge portion, so that long-term operation may not be easy. If the pressure exceeds 1000 kPa, the pressure resistance of the reactor may be increased. This is because large-scale equipment is required, and impurities tend to increase. The preferred pressure is between 50 and 300 kPa.
[0018]
On the other hand, if the temperature of the reaction field is lower than 500 ° C., mainly SiO 2 is easily generated, and if the temperature exceeds 1000 ° C., single Si is easily generated and more impurities from the furnace material and the like may be mixed. In any case, it becomes difficult to produce high-purity, ultrafine SiOx powder. In the above-mentioned temperature range, 550-950 ° C is preferred, and 650-850 ° C is a more preferred range.
[0019]
In the present invention, the monosilane gas and the oxidizing gas are alternately introduced into the reaction vessel at different times, not at once. As a result, SiOx particles containing Si particles and, depending on conditions, particles having a core-shell structure in which the Si particles are a core and the SiOx is a shell are formed. The reason is that when monosilane gas is introduced, monosilane is thermally decomposed to form a core of Si particles, and then, when an oxidizing gas is introduced, the outer periphery of the Si core is oxidized to form a SiOx shell. It is believed that there is.
[0020]
In the present invention, the reaction between the monosilane gas and the oxidizing gas is performed, if necessary, in the presence of a diluent gas composed of a non-oxidizing gas. Thereby, the adhesion of the generated SiOx powder to the container wall can be further reduced. As a diluent gas (hereinafter also referred to as a non-oxidizing gas), an inert gas such as argon or helium is optimal, but H 2 , N 2 , NH 3 , CO or the like is used as long as the reaction is not hindered. You can also. When dry air is used as the oxidizing gas, both the non-oxidizing gas and the oxidizing gas are used. The amount of the non-oxidizing gas is preferably larger than the total amount of the monosilane gas and the amount of oxygen that contributes to the oxidation reaction of the oxidizing gas, and is preferably at least 2 times, particularly preferably at least 10 times the molar ratio. . Here, the amount of oxygen that contributes to the oxidation reaction of the oxidizing gas is, for example, the amount of oxygen contained in the case of dry air, and the amount of oxygen atoms contained in the case of NO 2 and CO 2 . It is the amount of oxygen.
[0021]
As the reaction vessel, a vessel made of a high-purity material such as quartz glass can be used. The shape may be a cup shape with a bottom, but a tubular shape is preferred, and the orientation may be either vertical installation or horizontal installation. With respect to the method of heating the reaction vessel, means such as a resistance heating heating element, high-frequency heating, and infrared radiation heating can be used.
[0022]
The SiOx powder generated in the reaction vessel is discharged out of the system together with the non-oxidizing gas and the by-product gas, and is recovered using a conventionally known powder recovery device such as a bag filter.
[0023]
In the production method of the present invention, by changing the ratio of the monosilane gas to the oxidizing gas, it is possible to control and produce SiOx powder having different x values, that is, different O / Si molar ratios.
[0024]
The x value of the SiOx particles according to the present invention is 1.0 to 2.0. When the x value is less than 1.0, when a deposition material such as PVD is used, the deposition rate is decreased, and the deposition temperature needs to be increased. Therefore, it is not desirable, and based on the experimental study of the present inventors, Preferred x values are 1.2 to 1.8. The x value is obtained by measuring the molar amount of Si in SiOx according to JIS-R; 6124 (chemical analysis of silicon carbide abrasives), and measuring the molar amount of oxygen by an O / N simultaneous analyzer (for example, LECO “ TC-136 ") and can be calculated from their molar ratios.
[0025]
As described above, according to the method for producing SiOx powder of the present invention, SiOx particles containing Si particles, or having a core-shell structure in which Si particles are used as a core and SiOx as shells, and have a particle size of 50 nm or less, and A high-purity, ultrafine SiOx powder containing 90% by mass or more of the SiOx particles and having a specific surface area of 10 m 2 / g or more and a total amount of Na, Fe, Al and Cl of 10 ppm or less is easily prepared. Can be obtained. Further, the SiOx powder contains the SiOx particles having the above-mentioned specific structure, and can provide a SiOx powder comprising 5 to 50% by mass of Si particles and 95 to 50% by mass of SiOx surrounding the Si particles.
[0026]
The particle size of the high-purity, ultrafine SiOx powder according to the present invention can be measured by transmission electron microscope (TEM) observation. The fact that the SiOx powder contains Si particles or has a core-shell structure in which the Si particles are a core and the SiOx is a shell depends on the position and form of the peaks attributed to the Si particles in TEM observation and Raman spectroscopic analysis. You can check. The amount of the Si particles contained in the SiOx powder or present as the core can be determined by boiling the SiOx powder in heated hydrofluoric acid, treating the residue as Si particles, and measuring the mass.
[0027]
In the SiOx powder of the present invention, when the total amount of Na, Fe, Al, and Cl exceeds 10 ppm, when using this to form an interlayer insulating film or the like, it may cause poor insulation or corrosion, which is preferable. And it is more preferable that the content be 5 ppm or less. In addition, these impurities can be measured by an emission analysis method such as ICP. Further, when the specific surface area is less than 10 m 2 / g, the deposition start temperature may increase as described above. The specific surface area is more preferably at least 50 m 2 / g.
[0028]
When the high-purity, ultrafine SiOx of the present invention is used as a deposition raw material and PVD deposition is performed without light irradiation, a SiOy film with y = 1.2 to 1.8 is obtained, and this SiOy film is easily oxidized. have. In particular, a SiOy film obtained from the above-mentioned SiOx powder as a raw material without heating the base material and having a Si particle content of 0.1 to 5% by mass has a moderate dielectric breakdown. It has characteristics and can be suitably used as a protective film or an interlayer insulating film in a silicon high integrated circuit, a protective film in a compound semiconductor integrated circuit, or a protective film of an electroluminescence element, and further, as described later. It is characterized by being able to provide a SiOz film (1.5 ≦ z <2.0) which is easily oxidized and has more excellent dielectric breakdown characteristics. The y value reaches 1.5 or more and less than 2.0. The content of Si particles in the SiOy film is determined from the intensity ratio (area ratio) of the peak attributed to SiOy and the peak attributed to the Si particles in the Si 2p spectrum in the X-ray photoelectron spectrum (XPS).
[0029]
Regarding the reason that the SiOx film having excellent oxidizability is easily obtained by using SiOx powder, the present inventor has reported that Si particles are contained in SiOx particles. It is considered that the vapor deposition is performed so as to be left behind, and the presence of the above structure activates the Si particles in the vapor-deposited film and easily causes thermal oxidation or photo-oxidation.
[0030]
That is, the degree of oxidation of the SiOy film of the present invention can be further increased by, for example, heating at 400 ° C. for about 2 hours in an atmosphere containing oxygen after vapor deposition. The SiOy film has a feature that as the degree of oxidation increases, the insulating property increases accordingly.
[0031]
Further, the present invention is an SiOz film (1.5 ≦ z <2.0) obtained by using the above-mentioned SiOx powder as a deposition material and irradiating a deposited film obtained during or after the deposition with light. In particular, the SiOz film in which the light irradiation is performed at a temperature of 100 ° C. or less with the phenomenon of oxidation has a very excellent electric insulation property of a dielectric breakdown voltage of 4 MV / cm or more. , A protective film or an interlayer insulating film, a protective film in a compound semiconductor integrated circuit, a gate oxide film or an insulating film of a thin film transistor, or a protective film of an electroluminescence element.
[0032]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
[0033]
(Examples 1 to 5, Comparative Examples 1 to 4)
SiOx powder was produced using the apparatus illustrated in FIG.
First, a monosilane gas, a nitrogen gas, and an oxygen gas (all having a purity of 99.999% by mass or more) are prepared, and the respective gases are put into a quartz glass reaction vessel (inner diameter 60 mm × length 1500 mm) 1 through a mass flow meter. Introduced.
The monosilane gas was supplied through a monosilane gas introduction pipe 4 (inner diameter: 5 mm) made of quartz glass, mixed with nitrogen gas, and blown into the
[0034]
Here, the
[0035]
In many experiments, the pressure in the
[0036]
The generated SiOx powder was discharged from the discharge pipe 8 together with the by-product gas and the nitrogen gas, and was recovered by the
[0037]
In Comparative Example 3 in which the pressure in the
[0038]
[Table 1]
[0039]
[Table 2]
[0040]
(Example 6)
The reaction was carried out in the same manner as in Example 1 except that argon gas was used instead of nitrogen gas, and the results of analysis of the products are shown in Table 2.
[0041]
(Example 7)
The intervals between the introduction of the monosilane gas and the oxidizing gas were as follows: (1) introduction of the monosilane gas for 1 second, (2) interruption of the introduction of the gas for 1 second, (3) introduction of the oxidizing gas for 1 second, and (4) interruption of the introduction of the gas for 1 second. The reaction was carried out in the same manner as in Example 1 except for the cycle, and the results of analysis of the products are shown in Table 2.
[0042]
(Comparative Example 5)
Monosilane gas and oxidizing gas were introduced into the reaction vessel at the same time instead of alternately, and the reaction was carried out in the same manner as in Example 1 except that the results were analyzed.
[0043]
From Tables 1 and 2, according to the production method of the present invention, SiOx particles containing Si particles or having a core-shell structure in which Si particles are used as a core and SiOx is used as a shell and having a particle size of 50 nm or less can be obtained. In addition, a high-purity ultra-fine powder SiOx (x = 1.0 to 2.0) powder having a specific surface area of 10 m 2 / g or more and a total amount of Na, Fe, Al, and Cl of 10 ppm or less is obtained. Manufacturable but clear.
[0044]
(Examples 8 to 10, Comparative Examples 6 to 8)
The SiOx powder of each of Example 1, Example 6, Example 7, Comparative Example 1, and Comparative Example 5 and a commercially available SiO powder (Patinal 7725 manufactured by Merck) were used as raw materials for vapor deposition, and the pressure was 1.3 × 10 3. Evaporation was performed for 20 minutes on a gallium arsenide (GaAs) single crystal wafer at −5 Pa and an evaporation temperature of 1100 ° C. and a temperature of 45 ° C. to form an evaporated film having a thickness of about 300 nm.
[0045]
The amount of Si particles contained in the obtained film was determined from the intensity ratio (area ratio) of the peak attributed to SiOy and the peak attributed to the Si particles in the Si 2p spectrum in X-ray photoelectron spectrum (XPS). . The composition of the film (y value in SiOy) and the composition (z value in SiOz) of the film after irradiation with light using a halogen lamp in an atmosphere containing oxygen at room temperature (Si value of XPS) are represented by Si 2p and O 1s of XPS. It was determined from the peak intensity ratio. Further, the dielectric breakdown voltage of the film after light irradiation was measured. Table 3 shows the results.
[0046]
[Table 3]
[0047]
(Example 11, Comparative Examples 9 to 10)
The SiOx powders of Example 1 and Comparative Example 5 and the commercially available SiO powder used in Comparative Example 8 were used as raw materials for vapor deposition, at a pressure of 1.3 × 10 −5 Pa, an evaporation temperature of 1100 ° C. and an arsenic temperature of 45 ° C. Evaporation was performed on a gallium (GaAs) single crystal wafer while irradiating light with a halogen lamp for 20 minutes to form an evaporated film having a thickness of about 300 nm. The composition (z value in SiOz) of the obtained film was determined from the intensity ratio of Si 2p and O 1s peaks in XPS. The dielectric breakdown voltage of the film was measured. Table 3 shows the results.
[0048]
【The invention's effect】
According to the present invention, it has a core-shell structure containing Si particles or having Si particles as a core and SiOx as a shell, and has a particle size of 50 nm or less, a specific surface area of 10 m 2 / g or more, Na, Fe, A high-purity, ultrafine SiOx (x = 1.0 to 2.0) powder having a total amount of Al and Cl of 10 ppm or less is provided.
[0049]
The SiOx powder of the present invention can easily obtain a SiOy film having a high dielectric breakdown voltage when performing PVD deposition using the same, and further, the SiOy film is oxidized by light irradiation to have a higher dielectric breakdown voltage. The feature is that the SiOz film can be easily formed.
[0050]
Since the SiOy film and the SiOz film of the present invention have a very high dielectric breakdown voltage, a gate oxide film, a protective film or an interlayer insulating film in a silicon highly integrated circuit, a protective film in a compound semiconductor integrated circuit, a gate oxide film or an insulating film of a thin film transistor. It is very useful because it can be suitably used for various applications such as a coating film or a protective film for an electroluminescence element.
[Brief description of the drawings]
FIG. 1 is a schematic view of a reaction apparatus used for producing SiOx powder according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF
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JP2009041080A (en) * | 2007-08-09 | 2009-02-26 | Univ Of Electro-Communications | OXIDE FILM FORMATION METHOD, MOS DEVICE MANUFACTURING METHOD, MOS TRANSISTOR MANUFACTURING METHOD, SiOx POWDER AND SiOx POWDER PRODUCTION METHOD |
WO2012000858A1 (en) * | 2010-06-29 | 2012-01-05 | Umicore | Submicron sized silicon powder with low oxygen content |
JP2013530919A (en) * | 2010-06-30 | 2013-08-01 | エボニック デグサ ゲーエムベーハー | Modification of silicon layers composed of silane-containing compounds |
JP2016530189A (en) * | 2013-07-10 | 2016-09-29 | ユミコア | Silicon-based powder and electrode containing the same |
WO2024049235A1 (en) * | 2022-08-31 | 2024-03-07 | 주식회사 엘지에너지솔루션 | Negative active material, method for preparing same, negative electrode composition, negative electrode comprising same for lithium secondary battery, and lithium secondary battery comprising negative electrode |
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