• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.67-70
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• 2009

Printed electronics are emerging technology to realize various microelectronic devices via a cost-effective method. Here we introduce high performance inkjet printed polymer field-effect transistors and application to complementary integrated circuits with p-type and n-type conjugated polymers. The performance of devices highly depends on the selection of dielectrics, printing condition and device architecture. The device optimization and performances of various integrated circuits, e.g., complementary inverters and ring oscillators will be mainly discussed in this talk.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.575-578
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• 2009

Pentacene has excellent semi-conducting characteristics. But pentacene practically used in OTFTs gives rise to problems mainly due to its sensitivity to oxygen and its very low solubility. In order to make up the problems, 6,13-disubstituted pentacene derivatives were synthesized and characterized. The properties of the compounds were characterized by FT-IR, NMR spectroscopy and UV-visible spectrophotometer. Now we are measuring the charge transport mobility and the on/off current ratios.

• JSTS:Journal of Semiconductor Technology and Science
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• 제14권1호
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• pp.23-28
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• 2014

In this paper, we discuss on the optimal design scheme of the bilayer OLED (Organic Light Emitting Diodes) with micro-cavity structure. We carried out the optical simulation on the OLED device and calculated optimal scale of devices with taking the micro-cavity effect into account. Our emission model is based upon an ensemble of radiating dipole antennas. Consequently, we applied Maxwell's equation to this sequence, followed by the analysis on the electrical behaviors of OLED device using Poisson's equation. It contains carrier injection and transportation mechanism. In this process, we found out the thickness of each layer can affect the recombination rate at the emission layer. Therefore, we optimized the thickness of each layer to improve the efficiency of the device.

• 한국결정성장학회지
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• 제10권5호
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• pp.350-355
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• 2000

수평 Bridgeman방식으로 성장된 C축 방향의 사파이어 결정기판을 연마 가공하였으며, 또한 유기금속 기상화학 증착 방법으로 사파이어 기판 위에 GaN 박막을 증착하였다. 사파이어 인고트를 성장하여 2인치 사파이어 기판으로 이용하였으며 웨이퍼 절편장치 및 연마장치를 개발하였다. 이러한 다단계의 연마 가공은 기판 표면을 경면화하였다. 표면 평탄도 및 조도는 원자힘현미경으로 측정하였다. 개발된 사파이어 기판위에 성장된 GaN 박막의 특성 및 청색광소자로의 응용 가능성을 확인하였다.

• 마이크로전자및패키징학회지
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• 제9권4호
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• pp.31-34
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• 2002

For the mold die sticking mechanism, the major explanation is that the silica as a filler in EMC (epoxy molding compound) wears die surface to be roughened, which results in increase of adhesion strength. As the sticking behavior, however, showed strong dependency on the EMC models based on the experimental results from different semiconductor manufacturers, chemisorption or acid-base interaction is apt to be also functioning as major mechanisms. In this investigation, the plasma source ion implantation (PSII) using $O_2, N_2$, and $CF_4$ modifies sample surface to form a new dense layer and improve surface hardness, and change metal surface condition from hydrophilic to hydrophobic or vice versa. Through surface energy quantification by measuring contact angle and surface ion coupling state analysis by Auger, major governing mechanism for sticking issue was figured out to be a complex of mechanical and chemical factors.

• 한국전기전자재료학회논문지
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• 제29권1호
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• pp.6-10
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• 2016

In this study, the effects of soft baking temperature on the solution derived ZTO (Zn-Sn-O) TFTs (thin-film transistors) as a In-free oxide semiconductor were investigated. In spite of the same hard baking at high temperature($600^{\circ}C$), the electrical properties of ZTO TFT was greatly changed by a small difference in soft baking temperature($180{\sim}250^{\circ}C$). The performance of TFT was deteriorated as the soft baking temperature increased. Therefore, it is important to remove the water-related defects well as organic impurities from the ZTO films during soft baking for fabrication of solution-derived high performance of TFTs.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 D
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• pp.2079-2081
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• 2003

현재 산업화 사회가 가속됨에 따라 인체에 유해한 물질들이 발생한다. 그 중에서 VOC(Volatile Organic Component)는 인체에 치명적인 해를 일으키는 물질이다. 본 논문은 MOS(Metal Oxide Semiconductor) 센서를 이용하여 인체에 치명적인 유해 물질인 VOC를 측정하였다. 현재 VOC의 측정은 GC(Gas Chromatograph)를 이용하는데 이는 측정 시간이 길며 숙련된 측정자에 의해서만 측정이 가능하고 그 분석이 가능하다. 그러나 MOS 센서를 이용하면 숙련되지 않은 측정자도 측정이 가능하며 인공신경망을 이용하여 그 분석을 함으로서 누구나 쉽게 분석이 가능하고 실시간으로 측정이 가능하다.

• 한국광학회지
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• 제1권2호
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• pp.223-239
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• 1990

근래에 와서 통신 및 정보처리 기술에 있어서 기존의 전자공학적인 방법이 가지는 한계점을 광자공학적인 방법으로 보완하거나 극복하여 고속 및 대용량화를 가능케 하려는 움직임이 있다. 이러한 광통신 및 광정보처리 기술에 필요한 광재료 및 과자소자들에 적용되는 광자물리학을 살펴보고 또 앞으로의 연구 추세를 살펴보기로 한다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.211.1-211.1
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• 2013

We fabricate the conductive zinc oxide(ZnO) thin film using UV-enhanced atomic layer deposition. ZnO is semiconductor with a wide band gap(3.37eV) and transparent in the visible region. ZnO can be deposited with various method, such as metal organic chemical vapour deposition, magnetron sputtering and pulsed laser ablation deposition. In this experiment, ZnO thin films was deposited by atomic layer deposition using diethylzinc (DEZ) and D.I water as precursors with UV irradiation during water dosing. As a function of UV exposure time, the resistivity of ZnO thin films decreased dramatically. We were able to confirm that UV irradiation is one of the effective way to improve conductivity of ZnO thin film. The resistivity was investigated by 4 point probe. Additionally, we confirm the thin film composition is ZnO by X-ray photoelectron spectroscopy. We anticipate that this UV-enhanced ZnO thin film can be applied to electronics or photonic devices as transparent electrode.

• 한국안전학회지
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• 제38권2호
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• pp.30-35
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• 2023

Acetone is a widely used Volatile Organic Compound (VOC) in industries and laboratories. However, acetone affects human health adversely and causes fires and explosions. Early acetone detection and improved personnel training in safety and emergency management are necessary to prevent acetone-related accidents. The multi-VOC acetone detectors used currently have a sensitivity and selectivity limit. In this study, we discovered that Pt-loaded iron oxide (a metal oxide semiconductor) conversely, has high detection and selectivity for very low-levels of acetone gas. The loaded Pt catalyzes the reaction between the sensing materials' surface and the oxygen molecules in the air; this optimizes acetone detection and can decrease acetone-related illnesses, fires and explosions.