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원자층 증착법으로 제조된 Al-doped ZnO 투명전도막의 특성평가
정현준,신웅철,윤순길,Jung, Hyun-June,Shin, Woong-Chul,Yoon, Soon-Gil 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.2
AZO transparent conductive thin films were grown on $SiO_2$/Si and glass substrates using diethylzinc (DEZ) and trimethylaluminium (TMA) as the precursor and $H_2O$ as oxidant by atomic layer deposition. The structural, electrical, and optical properties of the AZO films were characterized as a function of film thickness at a deposition temperature of $150^{\circ}C$. The AZO films with various thicknesses show well-crystallized phases and smooth surface morphologies. The 190-nm-thick AZO films grown on Coming 1737 glass substrates exhibit rms(root mean square) roughness of 8.8 nm, electrical resistivity of $1.5{\times}10^{-3}\;{\Omega}-cm$, and an optical transmittance of 84% at 600nm wavelength. Atomic layer deposition technique for the transparent conductive oxide films is possible to apply for the deposition on flexible polymer substrates.
Off-axis RF 마그네트론 스퍼터링법을 이용하여 저온에서 결정화된 ITO 박막의 특성
최형진,정현준,허성기,윤순길,Choi, Hyung-Jin,Jung, Hyun-June,Hur, Sung-Gi,Yoon, Soon-Gil 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.2
In this study, off-axis magnetron sputtering was used for the crystallized ITO thin films at a low temperature of about $120^{\circ}C$ instead of the conventional RF sputtering because the off-axis sputtering can avoid the damage for the plasma as well as fabrication of thin films with a high quality. The ITO thin films grown on PET substrate at $120^{\circ}C$ were crystallized with a (222) preferred orientation. 58-nm thick ITO films showed a resistivity of about $2{\times}10-4{\Omega}{\cdot}cm$ and a transmittance of about 75% at a wavelength of 550 nm. The transmittance of the ITO thin films by an insertion of SiO2 thin films on ITO films was improved.
ITO/CNT 나노 복합체의 염료감응형 태양전지의 이용
박종현,정현준,조태연,윤순길,Park, Jong-Hyun,Pammi, S.V.N,Jung, Hyun-June,Cho, Tae-Yeon,Yoon, Soon-Gil 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.1
The ITO/Cabon Nano Tube (CNT) nano composites were deposited by nano cluster deposition (ITO) and arc discharge deposition (CNT) on glass substrates. The structural, optical and photovoltaic performance of ITO/CNT nano composites as a counter electrode of dye-sensitized solar-cells (DSSCs) such films were investigated. At low temperature below $250^{\circ}C$, the ITO films deposited on CNT. The ITO/CNT nano composit showed a good optical and electrical property for the counter electrode of DSSCs. When the as-prepared ITO/CNT nano composites are used for the counter electrodes, the photovoltaic parameters are $V_{OC}$ = 0.69 V, $J_{SC}$ = 5.69 mA/$cm^2$, FF = 0.32, and $\eta$ = 0.53 %. The ITO/CNT nano composites showed the possibility for the counter electrode applications of DSSCs.
박경아,임미경,정현준,김재현,Park, Kyung-Ah,Lim, Mikyung,Jung, Hyun-June,Kim, Jae-Hyun 한국전기전자재료학회 2021 전기전자재료학회논문지 Vol.34 No.1
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.
윤민아(Min-Ah Yoon),김찬(Chan Kim),정현준(Hyun-June Jung),김재현(Jae-Hyun Kim),김광섭(Kwang-Seop Kim) 한국트라이볼로지학회 2018 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.34 No.2
Graphene is a monolayer of carbon atoms (approximately 0.34 nm), arranged in a honeycomb network. It has been hailed as a next-generation flexible and transparent material because it has high electrical and thermal conductivities, excellent mechanical properties, as well as flexible and transparent properties. The wettability of graphene alters its adhesion or surface energy, and it is therefore an important parameter influencing its application in the fabrication of next-generation flexible and transparent electronics. Studies on the wettability of graphene are numerous and various opinions exist. However, almost all of these studies use the wet transfer method to transfer the graphene. In this study, therefore, we investigated the effect of wet and dry transfer methods on water contact angles of graphene on a substrate. The contact angles of substrates vary depending on the type of substrate. It was found that after graphene is transferred to the substrate, regardless of transfer method, the graphene/substrate contact angle increases to a value. The contact angle of graphene transferred using the dry transfer method is higher than the contact angle of graphene transferred using wet transfer methods. The wet transferred graphene is affected by the poly(methyl methacrylate) (PMMA) residue and the polar surface of substrate. The dry transferred graphene is influenced by the conformal contact between graphene and substrate.
차기구축함 통합마스트에 적용을 위한 전자기파 메타물질 흡수체의 온도 환경 내구성 검증
라영은(Young-Eun Ra),김용준(Yongjune Kim),정현준(Hyun-June Jung),박평원(Pyoungwon Park),조정대(Jeongdai Jo),이준식(Joonsik Lee),김명준(Myungjoon Kim),정준교(Joonkyo Jung),이건민(Gun-Min Lee),이종학(Jong-Hak Lee),이학주(Hak-Joo Lee) 한국전기전자학회 2020 전기전자학회논문지 Vol.24 No.1
본 논문에서는 차기구축함에 탑재될 통합 마스트의 레이더 반사면적을 감소시킬 수 있는 스텔스 기술로 응용하기 위해 해양 환경이 모사된 온도 환경 조건에서 전자기파 메타물질 흡수체의 내구성을 검증하였다. 이를 위해 미국 군사 규격인 MIL-STD-810H의 Method 501.7 중 Procedure I 조건에 따라 주기적으로 온도를 조절할 수 있는 항온 챔버에 저장 후 전자기파 메타물질 흡수체의 반사도를 측정하였다. 고온 환경시험 전과 후 모두 X 밴드 전체에서 스텔스 성능을 충족시킬 수 있는 -10 dB 미만의 반사도가 확인되었다. In this paper, the durability of an electromagnetic metamaterial absorber is verified in a temperature varying condition mimicking a maritime environment for the purpose of applying it to reduce the radar cross section of an integrated mast of the next-generation destroyer. To validate the durability, the reflectance of the electromagnetic metamaterial absorber was measured after storing it in a chamber that can control the temperature according to Procedure I of Method 501.7 included in MIL-STD-810H. Before and after the environmental test, both of the measured reflectances were retained less than -10 dB over the X band, that can guarantee the stealth functionality.