• 제목/요약/키워드: Technology Fusion

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p-InGaN/GaN 초격자구조에서 열처리 조건에 따른 오믹전극의 특성 (Characteristics of p-InGaN/GaN Superlattice structure of the p-GaN according to annealing conditions)

  • 장선호;김세민;이영웅;이영석;이종선;박민정;박일규;장자순
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2010년도 하계학술대회 논문집
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    • pp.160-160
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    • 2010

  • In this work, we investigate ohmic contacts to p-type GaN using a Pt/Cu/Au metallization scheme in order to achieve low resistance and thermally stable ohmic contact on p-GaN. An ohmic contact formed by a metal electrode deposited on a highly doped InGaN/GaN superlattice sturucture on p-GaN layer. The specific contact resistance is $1.56{\times}10^{-6}{\Omega}cm^2$ for the as-deposited sample, $1.35{\times}10^{-4}{\Omega}cm^2$ for the sample annealed at $250^{\circ}C$ and $6.88{\times}10^{-3}{\Omega}cm^2$ for the sample annealed at $300^{\circ}C$.

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Frustration of Rod-Disc Molecule in Reorientation under Vertical Electric Field

  • Jung, Jun-Ho;Ha, Kyung-Su;Chae, Mi-Na;Park, Seul-Ki;Song, Eun-Gyoung;Lee, Myong-Hoon;Jeong, Kwang-Un;Lee, Seung-Hee
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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    • pp.610-613
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    • 2009

  • New rod-disc liquid crystal (LC) molecule RD12 (12 is the number of carbon atoms between the rod and disc mesogenic liquid crystals) was synthesized via the chemical attachment of six cyanobiphenly calamitic mesogens linked to the triphenyl discotic mesogen with six alkyl chain linkage. Aligning characteristics associated with homogenous alignment is investigated at first and then field-dependent molecular reorientation under a vertical electric field is studied. Interestingly, they show abnormal slow molecular transition from initiate state (no electric field condition) to certain voltage. In this condition, we observe the molecular competition during reorientation. However, once a tilting direction of disk molecules are defined, the frustration is not observed anymore. The origin of this phenomenon is explained with a suggested model for the first time.

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N2 plasma treatment of pigments with minute particle sizes to improve their dispersion properties in deionized water

  • Zhang, Jingjing;Park, Yeong Min;Tan, Xing Yan;Bae, Mun Ki;Kim, Dong Jun;Jang, Tae Hwan;Kim, Min Su;Lee, Seung Whan;Kim, Tae Gyu
    • Journal of Ceramic Processing Research
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    • 제20권6호
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    • pp.589-596
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    • 2019

  • Pigments with minute particle sizes, such as carbon black (CB) and pigment red 48:2 (P.R.48:2), are the most important types of pigment and have been widely used in many industrial applications. However, minute particles have large surface areas, high oil absorption and low surface energy. They therefore tend to be repellent to the vehicle and lose stability, resulting in significant increases in viscosity or reaggregation in the vehicle. Therefore, finding the best way to improve the dispersion properties of minute particle size pigments presents a major technical challenge. In this study, minute particle types of CB and P.R.48:2 were treated with nitrogen gas plasma generated via radio frequency-plasma enhanced chemical vapor deposition (RF-PECVD) to increase the dispersion properties of minute particles in deionized (DI) water. The morphologies and particle sizes of untreated and plasma treated particles were evaluated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The average distributions of particle size were measured using a laser particle sizer. Fourier transform infrared spectroscopy was carried out on the samples to identify changes in molecular interactions during plasma processing. The results of our analysis indicate that N2 plasma treatment is an effective method for improving the dispersibility of minute particles of pigment in DI water.

  • https://doi.org/10.36410/jcpr.2019.20.6.589 인용