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한국전기전자재료학회> 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.)> DLC 박막이 코팅된 폴리머 애자의 표면 및 물리적 특성

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DLC 박막이 코팅된 폴리머 애자의 표면 및 물리적 특성

Surface and Physical Properties of Polymer Insulator Coated with Diamond-Like Carbon Thin Film

김영곤 ( Young Gon Kim ) , 박용섭 ( Yong Seob Park )
  • : 한국전기전자재료학회
  • : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권1호
  • : 연속간행물
  • : 2021년 01월
  • : 16-20(5pages)
전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.)

DOI


목차

1. 서 론
2. 실험 방법
3. 결과 및 고찰
4. 결 론
ORCID
REFERENCES

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In this study, we tried finding new materials to improve the stain resistance properties of polymer insulating materials. Using the filtered vacuum arc source (FVAS) with a graphite target source, DLC thin films were deposited on silicon and polymer insulator substrates depending on their thickness to confirm the surface properties, physical properties, and structural properties of the thin films. Subsequently, the possibility of using a DLC thin film as a protective coating material for polymer insulators was confirmed. DLC thin films manufactured in accordance with the thickness of various thin films exhibited a very smooth and uniform surface. As the thin film thickness increased, the surface roughness value decreased and the contact angle value increased. In addition, the elastic modulus and hardness of the DLC thin film slightly increased, and the maximum values of elastic modulus and hardness were 214.5 GPa and 19.8 GPa, respectively. In addition, the DLC thin film showed a very low leakage current value, thereby exhibiting electrical insulation properties.

UCI(KEPA)

간행물정보

  • : 공학분야  > 전기공학
  • : KCI등재
  • :
  • : 격월
  • : 1226-7945
  • : 2288-3258
  • : 학술지
  • : 연속간행물
  • : 1988-2022
  • : 4601


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35권1호(2022년 01월) 수록논문
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1이차원 유전체 나노시트의 개발 동향

저자 : 임해나 ( Haena Yim ) , 최지원 ( Ji-won Choi )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 1-10 (10 pages)

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Two-dimensional materials have shown a great promise for the next-generation electronic materials due to their unique optical, physical, and chemical properties that are distinct from their bulk counterparts. Their atomic-level thickness, the feature for flexible tenability, and exposed huge surface allow various approaches for high-performance nanoscale devices. Especially, this review highlights the recent progress on two-dimensional dielectric nanosheets, which are obtained by cheap and mass-producible solution-based exfoliation process, accompanied by the preparation methods, various deposition methods, and the characteristics of devices using a dielectric nanosheet thin films. We also present a perspective on the advantages offered by this two-dimensional dielectric nanosheets for the upcoming future nanoelectonics.

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2저항변화식 가스센서 선택성 향상을 위한 멤브레인 및 촉매 연구동향

저자 : 장지수 ( Ji-soo Jang )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 11-17 (7 pages)

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Direct exposure to toxic and hazardous gases has always been considered as the most pervasive problem worldwide, leading to a gradual increase in the number of asthma patients due to NOx/SOx gases inhaling and exposure to 50 ppm formaldehyde gases. Therefore, the development of accurate gas sensors is a key issue for resolving these problems. To address such issues, the development of membranes for selective filtering of target molecules as well as nanocatalyst for enhancing the sensing selectivity is highly crucial. In this review, the research progress for porous membrane materials (e.g. MOFs, and graphene) and nanocatalyst technology for the development of selective and accurate gas sensors will be discussed.

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3이젯 프린터를 사용한 고분자/퀀텀닷 마이크로 패터닝 공정

저자 : 김시몬 ( Simon Kim ) , 이수언 ( Su Eon Lee ) , 김봉훈 ( Bong Hoon Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 18-23 (6 pages)

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이젯 프린팅은 직접적인 비접촉 마이크로 팹기술의 하나로서 노즐과 기판 사이에 강한 전기장을 가함으로써 넓은 범위의 마이크로/나노패턴 어레이를 구현할 수 있는 다목적 팹공정이다. 제조된 고분자/퀀텀닷 마이이크로 패턴의 모양과 두께는 자동화된 프린트 기계에 설치된 노즐 직경과 공정에 사용된 잉크 성분에 일반적으로 정밀한 의존성을 갖는다. 본 논문의 목적은 실험 결과에 영향을 미칠 수 있는 각각의 공정 변수 효과를 설명하기 위해서 이젯 프린팅된 고분자/퀀텀닷의 전형적인 실제 예를 설명하는데 있다. 여기서 우리는 마이크로/나노 해상도로 두께가 정밀하게 제어된 고분자/퀀텀닷 패턴을 제조할 수 있는 몇 가지 이젯 프린팅 공정을 구현하였다.


Electrohydrodynamic jet (e-jet) printing, a type of direct contactless microfabrication technology, is a versatile fabrication process that enables a wide range of micro/nanopattern arrays by applying a strong electric field between the nozzle and the substrate. In general, the morphology and the thickness of polymers/quantum dot micropatterns show a systematic dependence on the diameter of the nozzle and the ink composition with a fully automated printing machine. The purpose of this report is to provide typical examples of e-jet printed micropatterns of polymers/quantum dots to explain the effect of each process variable on the result of experiments. Here, we demonstrate several operating conditions that allow high-resolution printing of layers of polymers/quantum dots with a precise control over thickness and submicron lateral resolution.

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4Li2CO3와 B2O3를 첨가한 Bi1/2Na1/2TiO3-SrTiO3 무연 압전 세라믹스의 저온 소성 연구

저자 : 이상섭 ( Sang Sub Lee ) , 박영석 ( Young-seok Park ) , 즈엉짱안 ( Trang An Duong ) , 무클리샤아이샤데비타 ( Mukhlishah Aisyah Devita ) , 한형수 ( Hyoung-su Han ) , 이재신 ( Jae-shin Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 24-31 (8 pages)

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This study investigated microstructures, crystal structures, polarization, dielectric and electromechanical properties of 0.76Bi1/2Na1/2TiO3-0.24SrTiO3 (BNT-24ST)-based piezoceramcs by adding Li2CO3 and B2O3 (LB) as sintering aids for low-temperature sintering. All samples were successfully synthesized using conventional solid-state reaction method and sintered at 950, 1,000, 1,050, 1,100 and 1,175℃ for 2 hours. Without LB, specimens required sintering temperatures over 1,175℃ for sufficient densification, while the addition of 0.10-mol LB decreased the sintering temperatures down to 950℃. The average grain size and dielectric properties of BNT-24ST-10LB ceramics were enhanced with increasing sintering temperature. We found that the low-temperature sintered BNT-24ST piezoceramics by adding LB showed the d33*value of 402 pm/V at 4 kV/mm after sintering at 1,050℃, which was better than that of high-temperature fired specimens sintered at 1,175℃ without LB (242 pm/V). We believe that the results of this study promise a candidate for low-cost multilayer ceramic actuator applications.

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5RF 마그네트론 스퍼터링 시스템을 이용하여 증착한 AGZO 박막의 Ar 유량에 따른 구조적, 전기적, 광학적 특성

저자 : 장석현 ( Seok-hyeon Jang ) , 김덕규 ( Deok Kyu Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 32-36 (5 pages)

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AGZO thin films were deposited on glass substrates using RF magnetron sputtering system under Ar flow rates, and their structural, electrical, and optical properties were analyzed systematically. As a result of the XRD pattern, the peak of the (002) (2θ≈33.7˚) orientation was observed, and it was found to have a hexagonal wurtzite structure. The sheet resistance of Ar 5 sccm was 3.073×102 Ω/sq and showed the best electrical properties because of the improvement of mobility due to the increase of the grain size and the variation of RMS roughness. In addition, the average transmittance was more than 90% for all samples, which demonstrated good optical properties. It is expected that the TCO characteristics can be improved by controlling Ar flow rates, and this will increase the efficiency of photoelectronic devices such as OLED and solar cells.

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6금속층 두께에 따른 ITO/Ag/ITO 다층 투명 전극의 발열 특성 연구

저자 : 민혜진 ( Hye-jin Min ) , 강예지나 ( Ye-jina Kang ) , 손혜원 ( Hye-won Son ) , 신소현 ( So-hyun Sin ) , 황민호 ( Min-ho Hwang ) , 이현용 ( Hyun-yong Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 37-43 (7 pages)

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In this study, we investigated the optical, electrical and exothermic characteristics of ITO/Ag/ITO multilayer structures prepared with various Ag thicknesses on quartz and PI substrates. The transparent conducting properties of the ITO/Ag/ITO multilayer films depended on the thickness of the mid-layer metal film. The ITO/Ag (14 nm)/ITO showed the highest Haccke's figure of merit (FOM) of approximately 19.3×10-3 Ω-1. In addition, the exothermic property depended on the substrate. For an applied voltage of 3.7 V, the ITO/Ag (14 nm)/ITO multilayers on quartz and PI substrates were heated up to 110℃ and 200℃, respectively. The bending tests demonstrated a comparable flexibility of the ITO/Ag/IT multilayer to other transparent electrodes, indicating the potential of ITO/Ag/ITO multilayer as a flexible transparent conducting heater.

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7다중준위 상변환 메모리를 위한 Ge2Sb2Te5/Ti/W-Ge8Sb2Te11 구조의 전기적 특성 연구

저자 : 오우영 ( Woo-young Oh ) , 이현용 ( Hyun-yong Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 44-49 (6 pages)

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In this paper, we investigated current (I)- and voltage (V)-sweeping properties in a double-stack structure, Ge2Sb2Te5/Ti/W-doped Ge8Sb2Te11, a candidate medium for applications to multilevel phase-change memory. 200-nm-thick Ge2Sb2Te5 and W-doped Ge8Sb2Te11 films were deposited on p-type Si(100) substrate using magnetron sputtering system, and the sheet resistance was measured using 4 point-probe method. The sheet resistance of amorphous-phase W-doped Ge8Sb2Te11 film was about 1 order larger than that of Ge2Sb2Te5 film. The I- and V-sweeping properties were measured using sourcemeter, pulse generator, and digital multimeter. The speed of amorphous-to-multilevel crystallization was evaluated from a graph of resistance vs. pulse duration (t) at a fixed applied voltage (12 V). All the double-stack cells exhibited a two-step phase change process with the multilevel memory states of high-middle-low resistance (HR-MR-LR). In particular, the stable MR state is required to guarantee the reliability of the multilevel phase-change memory. For the Ge2Sb2Te5 (150 nm)/Ti (20 nm)/WGe8Sb2Te11 (50 nm), the phase transformations of HR→MR and MR→LR were observed at t<30ns and t<65ns, respectively. We believe that a high speed and stable multilevel phase-change memory can be optimized by the double-stack structure of proper Ge-Sb-Te films separated by a barrier metal (Ti).

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8Nanosheet FETs에서의 효과적인 전열어닐링 수행을 위한 기계적 안정성에 대한 연구

저자 : 왕동현 ( Dong-hyun Wang ) , 박준영 ( Jun-young Park )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 50-57 (8 pages)

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Reliability of CMOS has been severed under aggressive device scaling. Conventional technologies such as lightly doped drain (LDD) and forming gas annealing (FGA) have been applied for better device reliability, but further advances are modest. Alternatively, electro-thermal annealing (ETA) which utilizes Joule heat produced by electrodes in a MOSFET, has been newly introduced for gate dielectric curing. However, concerns about mechanical stability during the electro-thermal annealing, have not been discussed, yet. In this context, this paper demonstrates the mechanical stability of nanosheet FET during the electro-thermal annealing. The effect of mechanical stresses during the electro-thermal annealing was investigated with respect to device design parameters.

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9스핀 코팅 공정에 따른 액정디스플레이용 폴리이미드 배향막 특성 분석

저자 : 김진아 ( Jin-ah Kim ) , 최세훈 ( Se-hoon Choi ) , 박홍규 ( Hong-gyu Park )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 58-65 (8 pages)

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The field of liquid crystal display (LCD) is constantly in the spotlight and the process of depositing an alignment layer in the LCD manufacturing process is very important to obtain excellent performance such as low-power driving and high-speed response to improve LCD performance. Therefore, research on liquid crystal (LC) alignment is being actively conducted. When manufacturing LCD, it is necessary to consider the effect of the alignment layer thickness as one of the factors affecting various LCD performances. In addition, previous studies confirmed the LC alignment characteristics correlate with the rotation speed in the spin coating process. Therefore, the electro-optical properties of the LCD were investigated by manufacturing a polyimide alignment layer by varying the rotation speed in the spin coating process in this study. It was confirmed that the thickness of the polyimide alignment layer was controlled according to the spin coating conditions. The average transmittances of anti-parallel LC cells at the spin coating speed of 2,500 rpm and 3,000 rpm are about 60%, which indicates that the LC cell has relatively higher performance. At the spin coating speed of 3,000 rpm, the voltage-transmittance curve of twisted nematic (TN) LC cell was below 1.5 V, which means that the TN LC cell operated at a low power. In addition, high-speed operating characteristics were confirmed with a response time of less than 30 ms. From these derived data, we confirmed that the ideal spin coating speed is 3,000 rpm. And these results provide an optimized polyimide alignment layer process when considering enhanced future LCD manufacturing.

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10송전선로용 고전압 절연체의 최적 형상에 대한 유한요소 해석

저자 : 김태용 ( Taeyong Kim ) , 산얄심피 ( Simpy Sanyal ) , 라벨로마데우스 ( Matheus Rabelo ) , 이준신 ( Junsin Yi )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 66-71 (6 pages)

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The insulator used for the transmission line is a device that is bonded with a cap, pin, ceramic, and cement to withstand insulation capacity and mechanical load. The insulator design can help to reduce the dispersion of the electric field; thus, the optimization of today's design, especially as demanded power grows, is critical. The designs of four manufacturers were used to perform a comparative analysis. Under dry circumstances of the new product, an electric field distribution study was done with no pollutants attached. Manufacturer D's design has the best voltage uniformity of 24.33% and the arc length of 500 mm or more. Manufacturer C's design has an equalizing voltage of more than 2% higher than that of other manufacturers. The importance of the design of the insulator and the number of connections according to the installation conditions is very efficient for transmission lines that will increase in the future.

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1Bi0.5Na0.5TiO3-BiFeO3-SrTiO3 삼성분계 무연 압전 세라믹스의 강유전체-완화형 강유전체 상전이 거동

저자 : 이상섭 ( Sang Sub Lee ) , 이창헌 ( Chang-heon Lee ) , 즈엉짱안 ( Trang An Duong ) , 웬호앙티엔코이 ( Hoang Thien Khoi Nguyen ) , 한형수 ( Hyoung-su Han ) , 이재신 ( Jae-shin Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 1호 발행 연도 : 2021 페이지 : pp. 1-7 (7 pages)

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This study investigated the structural, dielectric, ferroelectric, and strain properties of (0.98-x)Bi1/2Na1/2TiO3- 0.02BiFeO3-xSrTiO3 (BNT-BF-100xST, x=0.20, 0.22, 0.24, 0.26, and 0.28). All samples were successfully synthesized using the conventional solid-state reaction method and sintered at 1,175℃ for 2 h. The average grain size of the BNT-BF-100x ceramics decreased with increasing ST content. Furthermore, we observed that the ferroelectric- relaxor transition temperature (TF-R) decreased with increasing ST content, which eventually vanished in the BNT-BF-24ST ceramics. The results indicated that a ferroelectric to relaxor phase transition could be induced by ST modification. Consequently, a large electromechanical strain of 633 pm/V at 4 kV/mm was observed for the BNT-BF-26ST ceramics. These results imply that our materials have the competitive advantage of larger strain under lower operating field conditions compared with other BNT-based lead-free piezoelectric ceramics. We expect that BNT-BF-ST lead-free piezoelectric ceramics are promising candidates as a novel ternary BNT-based system and can find potential applications in actuators.

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2Light Intensity 및 명암비 향상을 위한 마이크로 LED의 사파이어 기판 형상 변화 연구

저자 : 차유정 ( Yu-jung Cha ) , 곽준섭 ( Joon Seop Kwak )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 1호 발행 연도 : 2021 페이지 : pp. 8-15 (8 pages)

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Micro-LEDs can be applied to various parts of a product. However, it has disadvantages compared to general LEDs in large displays such as low efficiency, intensity, and contrast ratio, among others, owing to their short history of study. The simulations were carried out using ray-tracing software to investigate the change in light intensity and light distribution according to pattern shapes on the sapphire substrate of the flip-chip micro-LED (FC μ-LED) array. Three patterns-concave square patterns, convex square patterns, and Ag coated convex patterns-which existed on the opposite side of FC μ-LEDs (115 ㎛ × 115 ㎛) array, were applied. The intensity of FC μ-LEDs on the center of the receivers depends on the pattern depth with shape. The concave square patterns having FC μ-LEDs arrays show that decreasing intensity as the patterns depth. On the contrary, the convex square patterns having FC μ-LEDs arrays shows that increasing intensity as the patterns depth. In addition, the highest intensity shows that FC μ-LEDs having Ag-coated convex patterns on the opposite side of sapphire lead to a reduction in light crosstalk owing to the Ag film.

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3DLC 박막이 코팅된 폴리머 애자의 표면 및 물리적 특성

저자 : 김영곤 ( Young Gon Kim ) , 박용섭 ( Yong Seob Park )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 1호 발행 연도 : 2021 페이지 : pp. 16-20 (5 pages)

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In this study, we tried finding new materials to improve the stain resistance properties of polymer insulating materials. Using the filtered vacuum arc source (FVAS) with a graphite target source, DLC thin films were deposited on silicon and polymer insulator substrates depending on their thickness to confirm the surface properties, physical properties, and structural properties of the thin films. Subsequently, the possibility of using a DLC thin film as a protective coating material for polymer insulators was confirmed. DLC thin films manufactured in accordance with the thickness of various thin films exhibited a very smooth and uniform surface. As the thin film thickness increased, the surface roughness value decreased and the contact angle value increased. In addition, the elastic modulus and hardness of the DLC thin film slightly increased, and the maximum values of elastic modulus and hardness were 214.5 GPa and 19.8 GPa, respectively. In addition, the DLC thin film showed a very low leakage current value, thereby exhibiting electrical insulation properties.

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4포토 리소그래피 공정을 위한 Ti(10 nm)-Buffered층 위에 직접 성장된 고품질 무전사 단층 그래핀 공정

저자 : 오거룡 ( Keo-ryong Oh ) , 한이레 ( Yire-han ) , 엄지호 ( Ji-ho Eom ) , 윤순길 ( Soon-gil Yoon )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 1호 발행 연도 : 2021 페이지 : pp. 21-26 (6 pages)

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Single-layer graphene is grown directly on Ti-buffered SiO2 at 100℃. As a result of the AFM measurement of the Ti buffer layer, the roughness of approximately 0.2 nm has been improved. Moreover, the Raman measurement of graphene grown on it shows that the D/G intensity ratio is extremely small, approximately 0.01, and there are no defects. In addition, the 2D/G intensity ratio had a value of approximately 2.1 for single-layer graphene. The sheet resistance is also 89 Ω/□, demonstrating excellent characteristics. The problem was solved by using graphene and a lift-off patterning method. Low-temperature direct-grown graphene does not deteriorate after the patterning process and can be used for device and micro-patterning research.

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5다층 그래핀/유리 구조체의 적외선 열복사 특성 연구

저자 : 박경아 ( Kyung-ah Park ) , 임미경 ( Mikyung Lim ) , 정현준 ( Hyun-june Jung ) , 김재현 ( Jae-hyun Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 1호 발행 연도 : 2021 페이지 : pp. 27-32 (6 pages)

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In this study, we fabricated multilayer graphene on a glass substrate by stacking the monolayer graphene synthesized via chemical vapor deposition. The electrical sheet resistance and optical transmittance were evaluated to confirm the quality of the stacked multilayer graphene. Using the fabricated multilayer graphene/glass structure, we characterized its thermal radiative property in terms of the integrated emissivity. The integrated emissivity of the multilayer graphene/glass structure was tuned from 0.91 to 0.72 when the number of graphene layers was changed from 1 to 12. We also demonstrated that the emissivity tunability provided a way to control the apparent temperature of an object that can be used in infrared stealth applications.

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6스퍼터링 질화탄소 박막의 트라이볼로지 및 전기적 특성의 기판 온도 영향

저자 : 박찬일 ( Chan Il Park )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 1호 발행 연도 : 2021 페이지 : pp. 33-38 (6 pages)

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Using facing target magnetron sputtering (FTMS) with a graphite target source, carbon nitride thin films were deposited on silicon and glass substrates at different substrate temperatures to confirm the tribological, electrical, and structural properties of thin films. The substrate temperatures were room temperature, 150℃, and 300℃. The tribology and electrical properties of the carbon nitride thin films were measured as the substrate temperature increased, and a study on the relation between these results and structural properties was conducted. The results show that the increase in the substrate temperature during the fabrication of the carbon nitride thin films increased the hardness and elastic modulus values, the critical load value was increased, and the residual stress value was reduced. Moreover, the increase in the substrate temperature during thin-film deposition was attributed to the improvement in the electrical properties of carbon nitride thin film.

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7태양전지 응용을 위한 ZnO:Al 박막의 전기적·물리적 특성에서 증착 온도의 영향

저자 : 박찬일 ( Chan Il Park )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 1호 발행 연도 : 2021 페이지 : pp. 39-43 (5 pages)

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In the case of ZnO:Al thin films, it is the best material that can replace ITO that is mainly used as a transparent electrode in electronic devices such as solar cells and flat-panel displays. In this study, ZnO:Al films were fabricated by using the RF dual magnetron sputtering method at various substrate temperatures. As the substrate temperature increased, the crystallinity of the ZnO:Al thin films was improved, and the electrical conductivity and electrical properties of the thin film improved owing to the increase in grain size. In addition, the surface roughness of the ZnO:Al thin films increased due to changes in the surface and density of the thin films. Moreover, the substrate temperature increased the density of thin films and improved their transmittance. To be applied to solar cells and other several electronic devices in the future, the hardness and adhesion properties of the thin film improve as the substrate temperature increases.

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8다파장 IR과 NIR 모듈의 평균 수명 예측에 관한 연구

저자 : 김동표 ( Dong Pyo Kim ) , 김경섭 ( Kyung Seob Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 1호 발행 연도 : 2021 페이지 : pp. 44-49 (6 pages)

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Recently, infrared (IR) and near-infrared (NIR) light-emitting diodes (LEDs) were widely used for home medical applications owing to its low output power and wide exposed area for curing. For deep penetration of the light under the skin, multiple LEDs with wavelengths of 700~10,000 nm were located on a flexible printed circuit board. When multiple wavelengths of LEDs were soldered on a circuit board, the lifetime of LED module highly depends on LEDs with a short lifetime. The mean time to failure (MTTF) was able to calculate with the experimental results under high temperature and the Arrhenius model. The results of this study could help companies to approve the warranty of LED modules and its product.

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9진공인터럽터용 신규 접점소재에 대한 차단 성능 평가

저자 : 차영광 ( Young-kwang Cha ) , 이일회 ( Il-hoi Lee ) , 주흥진 ( Heung-jin Ju ) , 신태용 ( Tae-yong Shin ) , 박경태 ( Kyong-tae Park )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 1호 발행 연도 : 2021 페이지 : pp. 50-55 (6 pages)

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Copper-chromium alloys have been used as contact materials of vacuum interrupters in circuit breakers, but new materials with highly stable performance are required to break the high voltage and high current barrier due to the recent increase in breaking capacity. In this paper, a new contact material was fabricated from a ternary alloy instead of existing Cu-Cr alloys. Its breaking performance and endurance were verified from a synthetic test and compared with that of various contact materials. The test results verified that the breaking performance of the new contact material was excellent.

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10촉매법을 적용한 오존 저감형 플라즈마 기기

저자 : 전신영 ( Sin Young Jeon ) , 김동준 ( Dong Jun Kim ) , 김종엽 ( Jong Yeop Kim ) , 권진구 ( Jin Gu Gwon ) , 전용민 ( Young Min Jeon ) , 도계령 ( Gye Ryung Do ) , 이성의 ( Seong Eui Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 1호 발행 연도 : 2021 페이지 : pp. 56-62 (7 pages)

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In this study, we created a DBD plasma device and a MnO2 catalyst mesh filter for evaluating ozone reduction of devices via the catalyst method. The DBD plasma device was manufactured by applying MnO2 paste to soda lime glass via the screen-printing method. The MnO2 catalyst mesh filter was manufactured by mixing MnO2 powder with binder with a 10% difference in concentration from 10% to 50% and then applying it using the dip-coating method. Finally, we sintered a MnO2 catalyst mesh filter in an electric furnace. We evaluated the characteristics of ozone generation according to the MnO2 gas flow of DBD plasma devices, the opening ratio, and ozone reduction performance of the MnO2 catalyst filters. Ozone reduction performance was approximately 20.4% at MnO210 wt%, 37.8% at MnO2 30 wt% and 50% at MnO2 50 wt%.

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