• The Bulletin of The Korean Astronomical Society
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• v.24 no.2
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• pp.120-120
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• 1999

• Bulletin of the Korean Chemical Society
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• v.10 no.5
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• pp.463-465
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• 1989

• Journal of the Optical Society of Korea
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• v.13 no.1
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• pp.28-32
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• 2009

In order to obtain high quality images of thin objects, we performed an experiment of proton radiography by using low energy protons generated from the interaction of an ultrashort ultraintense laser with solid targets. The protons were produced from a thin polyimide target irradiated by the laser pulse, and their maximum energy was estimated at up to 1.8 MeV. A CR-39 nuclear track detector was used as a proton radiography screen. The proton images were obtained by using an optical microscope and the spatial resolution was evaluated by a Modulation Transfer Function (MTF). We have achieved about $10\;{\mu}m$ spatial resolution of images. The obtained spatial resolution shows about $4{\sim}5$ times better value than the conventional X-ray radiography for inspection or non-destructive test (NDT) purpose.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.05a
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• pp.84-87
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• 2005

본 논문에서는 p-type 고분자 물질인 P3HT (Poly-3-hexylthiophene)를 잉크젯 프린팅 방식으로 활성화층을 적층함으로써 Organic thin film transistor를 제작하여 이에 대한 특성을 연구하였다. Piezoelectric 방식의 잉크젯 프린팅을 이용하여 P3HT single drop jetting 시 두께 $150{\sim}200{\AA}$, 직경 약 70 ~ 80 um정도의 drop profile을 얻을 수 있었다. P3HT의 solvent로서 Chlorobenzene을 사용하여 농도 약 0.5 wt.%의 Ink-jet용 ink를 제작하여 이를 Channel Width 37, 236 um 크기의 Au 전극 위에 jetting 하여 각각의 특성을 측정하였다. 상기 실험은 상온의 외부환경에서 실시되었으며 실험 결과 최대 ${\mu}=1{\times}10^{-2}\;cm^2/Vsec$, $I_{on}/I_{off}=10^3{\sim}10^4$ 정도로서 off current가 높은 편이나 이동도 측면에서는 다른 방법의 박막 증착 실험결과와 비교할 때 동등 수준의 결과를 얻을 수 있었다.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.981-984
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• 2004

We have studied a printability of synthesized silver nano solon ITO glass substrate. The highly concentrated polymeric dispersant-assisted silver nano sol was prepared by variation of molecular weight and control of initial nucleation and growth of silver nanoparticles, to achive dispersion stability and controlling the size of silver nanoparticles. The synthesized silver nano-sol was tested for printability to explore the possibility of micro-electrodes patterning on ITO glass substrate. The silver micro-electrode with 50${\sim}100{\mu}m$ line width was formed on ITO glass substrate.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08b
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• pp.1216-1219
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• 2007

We have been developing printed organic TFTs for flexible displays. In this study, we have pay attention to the operation stability improvement of the organic TFTs, and studied several factors especially depending on the dielectric layers. From the detailed analysis of the effects of dielectric layers, we have proposed a new printed dielectric layer which is mainly consisting of metal oxide and gives high operation stability

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.1535-1538
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• 2008

Carbon nanotube arrays were fabricated using micro molding in capillary (MIMIC) process. Patterns remained on the surface in the pattern complementary to that present in the mold. CNTs were selectively grown on the MIMIC patterned sites with a triode PECVD. And turn on field for $10\;{\mu}A/cm^2$ electron emission current was $2.2\;V/{\mu}m$ turn on field.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.1386-1389
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• 2005

We report the light illumination effect on the performance of pentacene organic thin-film transistor (OTFT). The TFT performance with and without illumination were measured at various temperatures. The off-state currents increase linearly with light intensity in the region of gate voltage where the holes are majority carriers in the TFT channel. The minimum photocurrents of OTFT increase with increasing light intensity.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.1425-1428
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• 2006

We have proposed a novel cleaning technology with organic nanoparticles for high-performance TFT array. The surface of the TFT layer becomes more hydrophilic after cleaning by the nanoparticles. This is concluded from the comparison of contact angles for the samples cleaned by various methods. It is found that the drain currents in the subthreshold and off-state regions are less than those for the TFTs cleaned with conventional method.

• Bulletin of the Korean Chemical Society
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• v.32 no.3
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• pp.783-784
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• 2011