• Title/Summary/Keyword: Young Chu

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Organic Thin Film-Transistor using Pentacene

  • Kim, Seong-Hyun;Hwang, Do-Hoon;Park, Heuk;Chu, Hye-Young;Lee, Jeong-Ik;Do, Lee-Mi;Zyung, Tae-Hyoung
    • 한국정보디스플레이학회:학술대회논문집
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    • 2000.01a
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    • pp.215-216
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    • 2000

  • We fabricated the thin-film transistors using organic semiconductor, pentacene, on $SiN_x$, gate insulator. X-ray diffraction experiments were performed for the sample after heat-treatments at higher temperatures. We confirmed that we obtained "thin-film phase" from the condition used here. From the electrical measurements, we also confirmed that no charges are accumulated at the interface between organic and insulating layer, and FET characteristics of the organic FET using pentacene was discussed.

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Impedance Spectroscopy of ${\pi}$-Conjugated Organic Materials

  • Kim, Seong-Hyun;Chu, Hye-Yong;Zyung, Taeh-Young;Yang, Yong-Suk
    • ETRI Journal
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    • v.26 no.2
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    • pp.161-166
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    • 2004

  • AC electrical properties of organic light-emitting diodes with poly(2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylenevinylene) (MEH-PPV), poly[2,5-bia(dimethyloctylsilyl)-1,4-phenylenevinylene] (BDMOS-PPV), and tris-(8-hydroxyquinolate)-aluminum $(AlQ_3)$ as light-emitting materials are studied. The frequency-dependent real and imaginary parts of impedance were fitted using an equivalent circuit. We found that the conduction mechanism is a space-charge limited current with exponential trap distribution.

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Self Cleaning Hydrophilic Impregnant of Concrete Structure (자기세정 콘크리트 표면보호재 적용에 관한 연구)

  • Song, Hun;Kim, Young-Yup;Chu, Yong-Sik;Lee, Jong-Kyu
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.645-648
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    • 2006

  • Normally, deterioration in the concrete structure is due to carbonation and chloride ion attack. Therefore, concrete structure is needed to surface protection for increase durability using impregnant. Impregnant classify into two large groups in polymeric and silicate materials. Silicate impregnant is included silicate and alkali silicate(sodium and lithium silicate). Thus, this study is concerned with self cleaning hydrophilic property of concrete structure using silicate impregnant. From the experimental test result, TEOS and lithium silicate make good use of hydrophilic impregnant.

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