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Hassinen, Tomi,Ahn, ByoungJoon,Ko, Sunglim IOP Publishing 2014 Japanese journal of applied physics Vol.53 No.5
<P>One of the difficulties in printed electronics is the robustness and reliability of the thin film transistor gate dielectrics. Thin layers are needed for low voltage operation. Proportionally thicker layers can be used if a higher permittivity (high-k) dielectric is chosen. Here we present the experimental results of partly inkjet and gravure printed thin film transistors with a commercial blend of barium titanate and poly(methyl methacrylate) (PMMA). Poly(triarylamine) (PTAA) or single walled carbon nanotube (SWCNT) inks were deposited as the semiconductor layer. Gravure printing of the dielectric material worked very well. On the other hand the SWCNT ink printing resulted in very thin layers which did not work well in transistors. Large hysteresis and high off current was present in most cases. The reference PTAA transistor measurements show that also a polymer semiconductor can work without hysteresis on top of the high-k dielectric. (C) 2014 The Japan Society of Applied Physics</P>
인쇄 및 건조조건의 변화가 전도성 잉크를 이용한 그라비아 인쇄 성능에 미치는 영향
한경준(Kyoungjoon Han),안병준(Byoungjoon Ahn),고성림(Sunglim Ko) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
e-Printing is the new manufacturing technology based on traditional pnntmg technology for electronic products. And these products need wide area printing and to be very cheap. Therefore gravure printing system with roll to roll (R2R) system will be used to reduce cost and to keep the required accuracy. There are several kinds of factors influencing the performance of printed electronics : drying type, drying temperature, driving tension, driving velocity, ink viscosity, conductivity of ink, accuracy of patterns, geometry of dot. Above factors have close relationship with each other. We must find a matching condition to enhance the performance of electronic product. In this paper, lines and areas will be printed using gravure printer with conductive ink on various different factors. The printing result will be analyzed to investigate the influence of various different factors to the effect of the performance of electronic product.
Kim, Jaemin,Chae, Daehwan,Lee, Wi Hyoung,Park, Janghoon,Shin, Jaehak,Kwon, Byeong-Chan,Ko, Sunglim Elsevier 2018 ORGANIC ELECTRONICS Vol.59 No.-
<P><B>Abstract</B></P> <P>Thin film transistors (TFTs) constitute important components employed in several printed electronic applications. Many electronic devices comprise TFTs, and their performances are determined by transistor specifications. As such, the optimum performance of a TFT assumes paramount importance in electronic applications. This paper reports the enhanced performance of an organic TFT (OTFT) achieved through use of the structural scaling technique employed during the gravure printing process. Extremely thin 30 nm-thick gravure printed Ag was used as source-drain electrodes while dielectric and semiconductor layers were gravure printed using D series and SP series from Merck, respectively. By scaling thicknesses of the source–drain electrode and dielectric layer, the electrical performance of an OTFT was found to have improved, during the roll-to-roll gravure printing process, in terms of an enhanced mobility of 0.295 cm<SUP>2</SUP> V<SUP>-1</SUP> s<SUP>-1</SUP> and an on–off current ratio of 10<SUP>6</SUP>. Additionally, OTFTs fabricated using the proposed roll-to-roll gravure printing process exhibit a yield percentage of 95% with a maximum operating speed of 15 m min<SUP>−1</SUP>. Furthermore, the OTFT demonstrated uniform electrical characteristics owing to use of an amorphous polymer semiconductor, which reduces the variability of each transistor.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sharp channel length and pattern edge were appropriately fulfilled by high printing speed of 15 m min<SUP>−1</SUP>. </LI> <LI> The study fabricated OTFT devices by employing a 3-layer roll-to-roll and single-layer inkjet printing processes. </LI> <LI> Highly thin about 30 nm-thick Ag source–drain electrode layer contributes to an enhanced yield percentage. </LI> <LI> Roll-to-roll gravure and inkjet printed OTFT shows excellent performance compared with other previous study of solution processed polymer OTFT. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>