• 제목/요약/키워드: advanced materials

검색결과 11,355건 처리시간 0.053초

WETTING PROPERTIES AND INTERFACIAL REACTIONS OF INDIUM SOLDER

  • Kim, Dae-Gon;Lee, Chang-Youl;Hong, Tae-Whan;Jung, Seung-Boo
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2002년도 Proceedings of the International Welding/Joining Conference-Korea
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    • pp.475-480
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    • 2002
  • The reliability of the solder joint is affected by type and extent of the interfacial reaction between solder and substrates. Therefore, understanding of intermetallic compounds produced by soldering in electronic packaging is essential. In-based alloys have been favored bonding devices that demand low soldering temperatures. For photonic and fiber optics packaging, m-based solders have become increasingly attractive as a soldering material candidate due to its ductility. In the present work, the interfacial reactions between indium solder and bare Cu Substrate are investigated. For the identification of intermetallic compounds, both Scanning Electron Microscopy(SEM) and X-Ray Diffraction(XRD) were employed. Experimental results showed that the intermetallic compounds, such as Cu$_{11}$In$_{9}$ was observed for bare Cu substrate. Additionally, the growth rate of these intermetallic compounds was increased with the reaction temperature and time. We found that the growth of the intermetallic compound follows the parabolic law, which indicates that the growth is diffusion-controlled.d.

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MOCVD로 성장된 ZnO 하이브리드 구조의 합성과 특성 분석 (Growth and characterization of ZnO hybrid structure grown by MOCVD)

  • 최미경;박지웅;김주희;민해정;허한나;김동찬;공보현;조형균
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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    • pp.420-420
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    • 2007
  • ZnO 나노막대는 산화물 반도체로서 넓은 밴드캡 (3.37eV)을 가진 반도체이며, 테라급의 전계 효과 트랜지스터(FET), 대기오염물질 모니터링 센서, 태앙전지용 전극, UV 발광소자, 전계방출 디스플레이의 팀 등 나노기술 전반에 활용해 최근 각광을 받고 있는 물질이다. 최근 디바이스 응용의 효율을 높이기 위한 방편으로 나노막대에서 박막으로의 연구가 활발하다. 본 실험은 MOCVD률 이용하여 p-si 기판위에 나노막대를 성장시킨 후 압력 및 온도 등의 공정변수를 조절하여 나노막대에서 박막으로 성장형태를 변화시켰다. SEM으로 1 차원 나노막대에서 2차원의 나노박막으로 성장이 된 ZnO 하이브리드 구조를 확인할 수 있었다. 또, PL장비를 이용해 ZnO의 UV영역의 파장을 확인할 수 있었다.

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Effect of Impregnation on Permalloy Powder Core

  • Kim, Hyo-Jin;You, Jae-Hyoung;Choi, Hyun-Sik;Kim, Gu-Hyun;Choi, Gwang-Bo;Han, Heung Nam;Yoo, Sang-Im
    • 한국자기학회:학술대회 개요집
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    • 한국자기학회 2013년도 자성 및 자성재료 국제학술대회
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    • pp.54-54
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    • 2013
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Luminescent characteristics of a blue-emitting $CaAl_2Si_2O_8:Eu^{2+}$ phosphor and the effect of boron ion substitution

  • Kwon, Byoung-Hwa;Vaidyanathan, Sivakumar;Li, Hui;Jang, Ho-Seoung;Yoo, Hyoung-Sun;Jeon, Duk-Young
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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    • pp.578-580
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    • 2008
  • Blue-emitting $CaAl_2Si_2O_8:Eu^{2+}(CAS:Eu^{2+})$ phosphor, prepared by solid-state reaction, is described in this paper. We researched the effect of boron ion substitution in the host materials. The phase and luminescent properties were investigated using the powder X-ray diffraction(XRD) and photoluminescence(PL) spectra.

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