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전기수력학 젯 프린팅 공정으로 제작된 Poly(3-hexylthiophene) (P3HT) 전계효과 트랜지스터
이형동(Hyungdong Lee),정용진(Yong Jin Jeong),이병선(Byoung-Sun Lee),박선욱(Seonuk Park),Hadi Teguh Yudistira,Chwee-Lin Choong,박종진(Jong-Jin Park),박찬언(Chan Eon Park),변도영(Doyoung Byun) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this study, direct micropatterning lines of poly(3-hexylthiophene) (P3HT) without any polymer binder were prepared by electrohydrodynamic jet printing to form organic field-effect transistors (OFETs). We controlled the dielectric surface by introducing self-assembled monolayers and polymer thin films to investigate the effect of surface modifications on the characteristics of printed P3HT lines and electrical performances of the OFETs. The morphology of the printed P3HT lines depended on the surface energy and type of substrate. The resulting OFETs exhibited high performance on octadecyltrichlorosilane-modified substrates, which was comparable to that of other printed P3HT OFETs. In order to realize the commercialization of the OFETs, we also fabricated a large-area transistor array, including 100 OFETs and low-operating-voltage flexible OFETs.
Jeong, Yong Jin,Lee, Hyungdong,Lee, Byoung-Sun,Park, Seonuk,Yudistira, Hadi Teguh,Choong, Chwee-Lin,Park, Jong-Jin,Park, Chan Eon,Byun, Doyoung American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.13
<P>In this study, direct micropatterning lines of poly(3-hexylthiophene) (P3HT) without any polymer binder were prepared by electrohydrodynamic jet printing to form organic field-effect transistors (OFETs). We controlled the dielectric surface by introducing self-assembled monolayers and polymer thin films to investigate the effect of surface modifications on the characteristics of printed P3HT lines and electrical performances of the OFETs. The morphology of the printed P3HT lines depended on the surface energy and type of substrate. The resulting OFETs exhibited high performance on octadecyltrichlorosilane-modified substrates, which was comparable to that of other printed P3HT OFETs. In order to realize the commercialization of the OFETs, we also fabricated a large-area transistor array, including 100 OFETs and low-operating-voltage flexible OFETs.</P>
Lee, Byoung-Sun,Yang, Ho-Sung,Jung, Heechul,Jeon, Seung-Yeol,Jung, Changhoon,Kim, Sang-Won,Bae, Jihyun,Choong, Chwee-Lin,Im, Jungkyun,Chung, U-In,Park, Jong-Jin,Yu, Woong-Ryeol RSC Pub 2014 Nanoscale Vol.6 No.11
<P>Silicon/carbon (Si/C) nanocomposites have recently received much attention as Li-ion battery negative electrodes due to their mutual synergetic effects in capacity and mechanical integrity. The contribution of Si to the total capacity of the Si/C nanocomposites determines their structural efficiency. Herein, we report on a multi-layered, one-dimensional nanostructure that exhibits the theoretical specific capacity of Si in the nanocomposite. Concentrically tri-layered, compartmentalized, C-core/Si-medium/C-shell nanofibers were fabricated by triple coaxial electrospinning. The pulverization of Si was accommodated inside the C-shell, whereas the conductive pathway of the Li-ions and electrons was provided by the C-core, which was proven by ex situ Raman spectroscopy. The compartmentalized Si in between the C-core and C-shell led to excellent specific capacity at a high current rate (>820 mA h g(-1) at 12000 mA g(-1)) and the realization of the theoretical specific capacity of the Li15Si4 phase of Si nanoparticles (3627 mA h g(-1)). The electrochemical characterization and inductively coupled plasma-atomic emission spectrometry provided direct evidence of full participation of Si in the electrochemical reactions.</P>