• 전자통신동향분석
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• 제28권5호
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• pp.34-42
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• 2013

대면적 태양전지와 디스플레이용 투명전극으로 지금까지는 투명전도성산화물(TCO: Transparent Conductive Oxide)이 일반적으로 사용되어 왔지만, 성능이 향상된 새로운 소자가 등장함에 따라 현재보다 우수한 광학 특성을 가지면서 낮은 전기저항을 갖는 새로운 투명전극을 개발하기 위한 관심이 집중되고 있다. 다양한 종류의 차세대 투명전극 기술 중 현재 응용 가능성이 가장 높은 투명합성전극(TCE: Transparent Composite Electrode, TCO/금속/TCO 구조) 기술은 단일 층 TCO를 사용하는 것보다 우수한 전기 광학적 특성을 보여주고, 더구나 플라스틱 기판 위에 저온에서도 공정이 가능하기 때문에 새로운 투명전극 기술로 부상하게 되었다. 본고에서는 투명합성전극 기술에 대해 소재의 선택, 전기 광학적 특성, 기계적 열적 습도 안정성과 소자 응용 관련 주요 현황에 대해 살펴보고자 한다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.430.1-430.1
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• 2016

We present the concept of reducible fugitive material that conformally surrounds core Cu nanowire (NW) to fabricate transparent conducting electrode (TCE). Reducing atmosphere can corrodes/erodes the underlying/surrounding layers and might cause undesirable reactions such impurity doing and contamination, so that hydrogen-/forming gas based annealing is impractical to make device. In this regards, we introduce novel reducible shell conformally surrounding indivial CuNW to provide a protection against the oxidation when exposed to both air and solvent. Uniform copper lactate shell formation is readily achievable by injecting lactic acid to the CuNW dispersion as the acid reacts with the surface oxide/hydroxide or pure copper. Cu lactate shell prevents the core CuNW from the oxidation during the storage and/or film formation, so that the core-shell CuNW maintains without signficant oxidation for long time. Upon simple thermal annealing under vacuum or in nitrogen atmosphere, the Cu lactate shell is easily decomposed to pure Cu, providing an effective way to produce pure CuNW network TCE with typically sheet resistance of $19.8{\Omega}/sq$ and optical transmittance of 85.5% at 550 nm. Our reducible copper lactate core-shell Cu nanowires have the great advantage in fabrication of device such as composite transparent electrodes or solar cells.

• 한국전기전자재료학회논문지
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• 제30권3호
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• pp.162-169
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• 2017

Indium tin oxide (ITO) thin films show a low sheet resistance and high transmittance in the visible range of the spectrum. Therefore, they play an important role as transparent electrodes for flat panel displays. However, their resistivity is rather high for use as a transparent electrode in large displays. One way to improve electrical and optical properties in large displays is to use ITO/Ag/ITO multilayer films. ITO/Ag/ITO multilayer films have lower sheet resistance than single layer ITO films with the same thickness. Prior to the ITO/Ag/ITO multilayer experiments, optimal condition for thickness change are necessary. Their thicknesses were deposited differently in order to analyze electrical and optical properties. However, when optimal single film characteristics are applied to ITO/Ag/ITO multilayer films, other phenomena appeared. After analyzing the electrical and optical properties by changing ITO and Ag film thickness, ITO/Ag/ITO multilayer films were optimized. By combining ITO film at $586\;{\AA}$ and Ag film at 10 nm, the ITO/Ag/ITO multilayer films showed optimized high optical transmittance of 87.65%, and the low sheet resistance of $5.5{\Omega}/sq$.