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Hanul Moon,Mincheol Kim,Seunghyup Yoo IEEE 2011 IEEE electron device letters Vol.32 No.8
<P>We propose a systematic fabrication method for stable high-performance organic thin-film transistors (TFTs) that are potentially compatible with high-density integrated circuits. Ag/PEDOT:PSS bilayers provide source/drain (S/D) electrodes with low sheet resistance and efficient hole injection capabilities, leading to high-performance bottom-contact pentacene TFTs with a saturation mobility of 0.19 cm<SUP>2</SUP>/ V·s. Patterned dielectric layers based on a fluoropolymer Cytop function as a hydrophobic bank structure to define S/D electrodes in a self-aligned manner from Ag ink and a PEDOT:PSS solution while simultaneously improving the electrical stability of pentacene TFTs.</P>
Controlling the Threshold Voltage of Organic Thin-Film Transistors by Transition Metal Oxides
Hanul Moon,Dongmo Im,Seunghyup Yoo IEEE 2013 IEEE electron device letters Vol.34 No.8
<P>We demonstrate an effective, noble metal-free method to control the threshold voltages (VT) of organic thin-film transistors (OTFTs). Through covering an Al gate electrode with a high work function (WF) transition metal oxide (TMO) layer of WO<SUB>3</SUB> or MoO<SUB>3</SUB>, VT is shifted in a positive direction from -2.15 V to -1.40 V or -0.89 V, respectively, with respect to that of OTFTs with a bare Al gate electrode. Together with a thin dielectric layer of cross-linked Cytop, the reduced magnitude of V<SUB>T</SUB> allows for a low-voltage switching operation with a gate voltage as small as 2 V. The amount of V<SUB>T</SUB> shift is shown to correlate well with the change in the WF of the gate electrode upon TMO deposition.</P>
Complementary p- and n-Type Polymer Doping for Ambient Stable Graphene Inverter
Yun, Je Moon,Park, Seokhan,Hwang, Young Hwan,Lee, Eui-Sup,Maiti, Uday,Moon, Hanul,Kim, Bo-Hyun,Bae, Byeong-Soo,Kim, Yong-Hyun,Kim, Sang Ouk American Chemical Society 2014 ACS NANO Vol.8 No.1
<P>Graphene offers great promise to complement the inherent limitations of silicon electronics. To date, considerable research efforts have been devoted to complementary p- and n-type doping of graphene as a fundamental requirement for graphene-based electronics. Unfortunately, previous efforts suffer from undesired defect formation, poor controllability of doping level, and subtle environmental sensitivity. Here we present that graphene can be complementary p- and n-doped by simple polymer coating with different dipolar characteristics. Significantly, spontaneous vertical ordering of dipolar pyridine side groups of poly(4-vinylpyridine) at graphene surface can stabilize n-type doping at room-temperature ambient condition. The dipole field also enhances and balances the charge mobility by screening the impurity charge effect from the bottom substrate. We successfully demonstrate ambient stable inverters by integrating p- and n-type graphene transistors, which demonstrated clear voltage inversion with a gain of 0.17 at a 3.3 V input voltage. This straightforward polymer doping offers diverse opportunities for graphene-based electronics, including logic circuits, particularly in mechanically flexible form.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-1/nn4053099/production/images/medium/nn-2013-053099_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn4053099'>ACS Electronic Supporting Info</A></P>
Taxonomic study of subfamily Epipaschiinae (Lepidoptera, Pyralidae) in Korea
Hanul Kim,Ulziijargal Bayarsaikhan,Chang-Moon Jang,Jeong-Nam Kim,Seokhoon Choi,Yang-Seop Bae 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
The subfamily Epipaschiinae belongs to the family Pyralidae in the superfamily Pyraloidea. Moths of the epipaschiine are mostly medium-sized, and around 705 species have been described worldwide, with most of them distributed in Tropical and Temperate Regions (Nuss et al., 2023). In this study, 24 species of 10 genera of the subfamily Epipaschiinae are identified. All of the species are accompanied by distributions, host plants, and collection site information. Illustrations of adults, male and female genitalia are provided.