• Title, Summary, Keyword: ink-jet printing

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Pentacene Thin-Film Transistor with PEDOT:PSS S/D Electrode by Ink-jet Printing Method (잉크젯 프린팅 방법을 이용한 Pentacene 박막 트랜지스터의 제작 및 특성 분석)

  • Kim, Jae-Kyoung;Kim, Jung-Min;Lee, Hyun Ho;Yoon, Tae-Sik;Kim, Yong-Sang
    • Proceedings of the KIEE Conference
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    • pp.1277-1278
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    • 2008
  • Pentacene 박막 트랜지스터의 소스/드레인 전극을 폴리머인 Poly(3,4-ethylene dioxythiophene) poly(styrenesulfonate) (PEDOT:PSS)를 사용하여 잉크젯 프린팅 방법으로 제작하였다. 펜타신 박막 트랜지스터는 열 증착법을 사용하여 폴리며 기판위에 100nm의 두께로 증착하였다. 게이트 절연막은 $SiO_2$ 위에 Polymethly Methacrylate (PMMA)를 증착시킨 double layer를 사용하였다. PMMA 위에 증착시킨 pentacene 결정립이 $SiO_2$ 위에 증착한 pentacene 결정립 보다 크게 성장하였고, double layer의 절연막을 씀으로 인해 게이트 누설 전류가 감소함을 보였다. Pentacene 증착 온도에 따른 결정립 크기를 비교하여 가장 적절한 온도를 찾았다. 프린팅 방법을 사용하여 만든 박막 트랜지스터는 전계효과 이동도가 ${\mu}_{FET}=0.023cm^2/Vs$ 이고, 문턱이전 기울기 S.S=0.49V/dec, 문턱전압 $V_{th}=-18V$, $I_{on}/I_{off}$ 전류비 >$10^3$의 전기적 특성을 보였다.

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Color Gamut Mapping and Dithering for Ink-Jet Color Printing (잉크젯 칼라 프린팅을 위한 색역 사상과 디더링)

  • Lee, Chae-Soo;Kim, Kyeong-Man;Lee, Cheol-Hee;Ha, Yeong-Ho
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.35S no.6
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    • pp.137-146
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    • 1998
  • Recently many devices print electronic images in a variety of ways. The reproduced color, however, is different from the original color because of the difference of hardware characteristics. To maintain device independent color, gamut mapping method is proposed. The proposed color gamut mapping uses nonlinear intensity mapping and clipping for saturation mapping on HSI color space. In the dithering operation, expanded nonlinear ordered dithering and modified error diffusion are proposed. The proposed ordered dithering uses expanded nonlinear quantization which considers overlapping phenomena of neighbored printing dots. In the modified error diffusion, quantization errors to be diffused are adjusted to improve both image blur and color change produced in the error diffusion. So, the printed image is similar to the image of monitor. Our results indicate that proposed algorithm can produce high quality image in the low bit color devices.

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Performance Improvement of TIPS-pentacene OTFTs by blending with Polystyrene (절연고분자 polystyrene 혼합에 의한 TIPS-pentacene OTFT의 성능 개선)

  • Kim, Jae Seon;Song, Chung Kun
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.7
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    • pp.96-101
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    • 2013
  • In this paper we analyzed the effects of polystyrene(PS) blended in TIPS-pentacene on the performance of OTFTs. With the various molecular weight and the content of PS the performance of TIPS-pentacene OTFTs was examined and the proper molecular weight and the content were extracted for the best results. With the molecular weight of 9,580 and 0.3 wt% of PS OTFTs produced the mobility of $1.0{\pm}0.19cm^2/V{\cdot}sec$, the subthreshold slope $0.22{\pm}0.05$ V/dec, the threshold voltage $-1.19{\pm}1.21$ V, the current on/of ratio $7.12{\pm}2.09{\times}10^6$. Additionally the suitable substrate temperature for ink jet printing of the blended TIPS-pentacene OTFTs was also extracted and it was $46^{\circ}C$.

Evaluation for Adhesion Characteristics of UV-curable Bump Shape Stamp for Transfer Process (전사공정을 위한 UV 경화성 범프형 스탬프의 점착특성 평가)

  • Jeong, Yeon-Woo;Kim, Kyung-Shik;Lee, Chung-Woo;Lee, Jae-Hak;Kim, Jae-Hyun;Kim, Kwang-Seop
    • Tribology and Lubricants
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    • v.32 no.3
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    • pp.75-81
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    • 2016
  • Future electronics such as electronic paper and foldable cellphone are required to be flexible and transparent and should have a high performance. In order to fabricate the flexible electronics using flexibility transfer process, techniques for transferring various devices from rigid substrate onto flexible substrate by elastomeric stamp, have been developed. Adhesion between the elastomeric stamp and various devices is crucial for successful transfer process. The adhesion can be controlled by the thickness of the stamp, separation velocity, contact load, and stamp surface treatment. In this study, we fabricated the bump shape stamp consisting of a UV-curable polymer and investigated the effects of curing condition, separation velocity, and contact load on the adhesion characteristics of bumps. The bumps with hemispherical shape were fabricated using a dispensing process, which is one of the ink-jet printing techniques. Curing conditions of the bumps were controlled by the amount of UV irradiation energy. The adhesion characteristics of bumps are evaluated by adhesion test. The results show that the pull-off forces of bumps were increased and decreased as UV irradiation energy increased. For UV irradiation energies of 300 and 500 mJ/cm2, the pull-off forces were increased as the separation velocity increased. The pull-off forces also increased with the increase of contact load. In the case of UV irradiation energy above 600 mJ/cm2, however, the pull-off forces were not changed. Therefore, we believe that the bump shape stamp can be applied to roll-based transfer process and selective transfer process as an elastomeric stamp.