• Title/Summary/Keyword: Hydrogen deposition

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Effect of Hydrogen Passivation on the Photoluminescence of Si Nanocrystallites Thin Flms (수소 Passivation에 따른 실리콘 나노결정 박막의 광학적 특성 변화 연구)

  • 전경아;김종훈;이상렬
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.29-32
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    • 2001
  • Hydrogen passivation of Si nanocrystals identifies luminescence mechanism indirectly. Si nanocrystallites thin films on p-type (100) Si substrate have been fabricated by pulsed laser deposition technique using a Nd:YAG laser After deposition, Si nanocrystallites thin films have been annealed at 600$^{\circ}C$ and 760$^{\circ}C$ in nitrogen ambient, respectively. Hydrogen passivation was subsequently performed at 500$^{\circ}C$ in forming gas (95 % N$_2$ + 5 % H$_2$) for an 1 hour. We report the photoluminescnece(PL) property of Si thin films by the hydrogen passivation. The luminescence mechanism of Si nanocrystallites has also been investigated.

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Field emission from hydrogen-free DLC

  • Suk Jae chung;Han, Eun-Jung;Lim, Sung-Hoon;Jin Jang
    • Journal of Korean Vacuum Science & Technology
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    • v.3 no.1
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    • pp.49-53
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    • 1999
  • We have studied the field emission characteristics of diamond-like-carbon (DLC) films deposited by a layer-by-layer technique using plasma enhanced chemical vapor deposition, in which the deposition of a thin layer of DLC and a CH4 plasma exposure on its surface were carried out alternatively. The hydrogen-free DLC can be deposited by CH4 plasma exposure for 140 sec on a 5 nm DLC layer. N2 gas-phase doping in the CH4 plasma was also carried out to reduce the work function of the DLC. The optimum [N2]/[CH4] flow rate ratio was found to be 9% for the efficient electron emission, at which the onset-field was 7.2 V/$\mu\textrm{m}$. It was found that the hydrogen-free DLC has a stable electron emitting property.

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New Selective Tungsten Deposition Process by the alternating Cyclic Hydrogen Reduction of $WF_6$ using LPCVD (LPCVD을 사용하여 $WF_6$의 교번적 수소환원 반응에 의한 새로운 선택적 텅스텐 박막 증착)

  • ;Arnold Reisman;Christopher Berry
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.39 no.7
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    • pp.692-701
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    • 1990
  • New selective tungsyen deposition deposition on silicon process is described which makes use of a previously unreported, alternating cyclic,

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The Physical Properties of Silicon and Silicon-Oxide by Epitaxial Growth (1) (기상성장에 의한 Si단결정과 Si산화막의 특성( 1 ))

  • 성영권;오석주;김석기;이상수
    • 전기의세계
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    • v.22 no.2
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    • pp.11-18
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    • 1973
  • This paper reports some results of Si and SiO$_{2}$ films obtained from the expitaxial growth by hydrogen reduction of SiCI$_{4}$ with a hydrogen and carbon dioxide mixture in an epitaxial-deposition chamber. The deposited Si and SiO$_{2}$ are studied by observing the process parameters affecting the rate of deposition, and the quantitative properties at the interface of Si and SiO$_{2}$ are also considered briefly according to the results of the optical absorption and the voltage-current characteristic of MOS etc. using step etching procedure for oxide films.

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$Ba[Ce_{0.9}Y_{0.1}]O_{3-\delta}$ - Ni Composite Membrane for Hydrogen Separation by Aerosol Deposition Method (에어로졸 증착법[aerosol depostion method]에 의한 $Ba[Ce_{0.9}Y_{0.1}]O_{3-\delta}$ - Ni 수소분리막 제조)

  • Park, Young-Soo;Byeon, Myeong-Seob;Choi, Jin-Sub;Kim, Jin-Ho;Hwang, Kwang-Taek
    • Transactions of the Korean hydrogen and new energy society
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    • v.21 no.2
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    • pp.117-122
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    • 2010
  • BCY($Ba(Ce_{0.9}Y_{0.1})O_{3-\delta}$) oxide, shows high protonic conductivity at high temperatures, and are referred to as hydrogen separation membrane. For high efficiency of hydrogen separation ($H_2$ flux and selectivity) and low fabrication cost, ultimate thin and dense BCY-Ni layer have to be coated on a porous substrate such as $ZrO_2$. Aerosol depostion (AD) process is a novel technique to grow ceramic film with high density and nano-crystal structure at room-temperature, and would be applied to the fabrication process of AD integration ceramic layer effectively. XRD and SEM measurements were conducted in order to analyze the characteristics of BCY-Ni membrane fabricated by AD process.

Hydrogen Storage Property of MgH2 Synthesized by Hydriding Chemical Vapor Deposition (Hydriding Chemical Vapor Deposition 방법으로 제조된 MgH2의 수소저장 특성)

  • Park, Kyung-Duck;Han, Jeong-Seb;Kim, Jin-Ho;Kim, Byung-Kwan
    • Transactions of the Korean hydrogen and new energy society
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    • v.22 no.3
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    • pp.380-385
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    • 2011
  • $MgH_2$ was synthesized by hydriding chemical vapor deposition (HCVD). In this study, we examined the hydrogen storage property of $MgH_2$ synthesized by HCVD. The results of pressure-composition-temperature (PCT) measurement showed that the HCVDed $MgH_2$ reversibly absorbed hydrogen as much as 6 wt%. Each hydrogenation rate was very greater than the conventional alloy methods. The reason was that the particle size made by HCVD was small as approximately 1 ${\mu}m$. The PCT of $MgH_2$ made by HCVD methode was similar to a commercial $MgH_2$. The ${\Delta}H$ and ${\Delta}S$ value are respectively -76.8 $kJ/mol{\cdot}H_2$ and -137.4 $kJ/mol{\cdot}H_2$. Mg made by HCVD methode was activated easily than commercial Mg. Also the initial reaction rate was faster than that of commercial $MgH_2$. 70% of the total storage were stored during 400s.

The Effect of Sputtering Process Variables on the Properties of Pd Alloy Hydrogen Separation Membranes (스퍼터 공정변수가 팔라듐 합금 수소분리막의 특성에 미치는 영향)

  • Han, Jae-Yun;Joo, Sae-Rom;Lee, Jun-Hyong;Park, Dong-Gun;Kim, Dong-Won
    • Journal of the Korean institute of surface engineering
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    • v.46 no.6
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    • pp.248-257
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    • 2013
  • It is generally recognized that thin Pd-Cu alloy films fabricated by sputtering show a wide range of microstructures and properties, both of which are highly dependent on the sputtering conditions. In view of this, the present study aims to investigate the relationship between the performance of hydrogen separation membranes and the microstructure of Pd alloy films depending on sputtering deposition conditions such as substrate temperature, working pressure, and DC power. We fabricated thin and dense Pd-Cu alloy membranes by the micro-polishing of porous Ni support, an advanced Pd-Cu sputtered multi-deposition under the conditions of high substrate temperature / low working pressure / high DC power, and a followed by Cu-reflow heat-treatment. The result of a hydrogen permeation test indicated that the selectivity for $H_2/N_2$ was infinite because of the void-free and dense surface of the Pd alloy membranes, and the hydrogen permeability was 10.5 $ml{\cdot}cm^{-2}{\cdot}min^{-1}{\cdot}atm^{-1}$ for a 6 ${\mu}m$ membrane thickness.

Powder Synthesis and Membrane Deposition of BaCe0.9Y0.1O2.95 and SrCe0.9Y0.1O2.95 System for Hydrogen Separation Application (수소분리용 BaCe0.9Y0.1O2.95 및 SrCe0.9Y0.1O2.95 분말 합성 및 분리막 증착)

  • Kang, Kyung-Min;Yun, Young-Hoon
    • Transactions of the Korean hydrogen and new energy society
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    • v.22 no.6
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    • pp.759-764
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    • 2011
  • Mixed-conducting oxide powders, $BaCe_{0.9}Y_{0.1}O_{2.95}$ (BCY) and $SrCe_{0.9}Y_{0.1}O_{2.95}$ (SCY) powders have been prepared by a solid-state reaction method. Xray diffraction patterns of the prepared powders showed the sharp peaks of the $BaCe_{0.9}Y_{0.1}O_{2.95}$ and $SrCe_{0.9}Y_{0.1}O_{2.95}$ phases. The oxide powders that were prepared by attrition milling showed rather large particles and severe necking between particles in FE-SEM images as well as residual reactant ($BaCO_3$) and secondary phases ($SrCeO_3$ and $CeO_2$) in XRD patterns. The oxide powders prepared using ball milling showed particles under approximately 500 nm and typical XRD patterns of the $BaCe_{0.9}Y_{0.1}O_{2.95}$ and $SrCe_{0.9}Y_{0.1}O_{2.95}$ phases. Ceramic membranes of the $BaCe_{0.9}Y_{0.1}O_{2.95}$ and $SrCe_{0.9}Y_{0.1}O_{2.95}$ phases were fabricated by the aerosol deposition method using the oxide powders synthesized.