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First record of the genus Daiconotrechus (Coleoptera: Carabidae) in Korea
Jangwon Seo,Jong-seok Park 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
The genus Daiconotrechus Ueno, 1971 is endemic genus of Japan with two subgenera, Daiconotrechus Ueno, 1971 and Tsuiblemus Ueno, 2007. Adults of all species in this genus are eyeless with depigmented and elongated body. These morphological features are typical characters of adaptation to subterranean environments. Distribution of all species of the subgenus Tsuiblemus is restricts to Tsushima Island, Japan. In this study, we report the genus Daiconotrechus for the first time in Korea, with a new species in the subgenus Tsuiblemus. Illustrations of morphological characters and habitus are also provided.
Seo, Jangwon,Kim, Sehoon,Gihm, Se Hoon,Park, Chong Rae,Park, Soo Young Royal Society of Chemistry 2007 Journal of materials chemistry Vol.17 No.48
<P>We have synthesized a novel class of excited-state intramolecular proton transfer-active molecule (DOXG) forming columnar liquid crystals with enhanced fluorescence emission. The intramolecularly H-bonded core of DOXG produced columnar hexagonal and rectangular phases during cooling as a result of strong core-to-core interactions. In its mesophase, DOXG produced tilted stacking (J-type) in the inner column due to the elliptical molecular shape, bringing about a strong (quantum yield of 34%) and large Stokes' shifted (∼173 nm) fluorescence emission.</P> <P>Graphic Abstract</P><P>We report a fluorescent columnar liquid crystal consisting of an ESIPT core of elliptical molecular shape that plays a key role in establishing a tilted columnar stacking and enhanced fluorescence emission. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b711883j'> </P>
Efficient and Stable Perovskite Solar Cells
Jangwon Seo(서장원) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Power conversion efficiencies (PCE) of perovskite solar cells (PSCs) has rising from the initial 3.8% to the state-of-the-art 25.5% within the past few years. Most highly efficient PSCs utilize an n-type layer of mesoporous titanium dioxide or tin oxide in an n-i-p device configuration, in which organic conductors are widely used to transport holes into an adjoined metal. In this talk, we will discuss several challenges that need to be addressed in improving the photovoltaic performance and enhancing the stability of the perovskite solar cells, i.e. (1) preparation of high crystalline film of (FAPbI3)1-x(MAPbBr3)x with controlled carrier mobility and light harvesting, (2) development of selective charge-transporting layers (CTL) with physically and electrically tuned property, (3) interfacial control between the perovskite and the CTLs for reducing the surface defect and preventing the interfacial recombination, and (4), new hole-transporting materials for device stability.
Benefits of very thin PCBM and LiF layers for solution-processed p–i–n perovskite solar cells
Seo, Jangwon,Park, Sangman,Chan Kim, Young,Jeon, Nam Joong,Noh, Jun Hong,Yoon, Sung Cheol,Seok, Sang Il The Royal Society of Chemistry 2014 ENERGY AND ENVIRONMENTAL SCIENCE Vol.7 No.8
<P>Highly efficient p–i–n perovskite solar cells employing a flat and thick CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> film and a thin PCBM film are fabricated by the solution-process at low temperature. Through attainment of optimized PCBM thickness and insertion of the LiF interlayer, the unit cell shows 14.1% of overall power conversion efficiency (PCE) with a <I>J</I><SUB>sc</SUB> of 20.7 mA cm<SUP>−2</SUP>, a <I>V</I><SUB>oc</SUB> of 0.866 V, and a FF of 78.3% under AM 1.5G 100 mW cm<SUP>−2</SUP> conditions, while a larger area 10 cell serially connected module (10 × 10 cm<SUP>2</SUP>) shows an 8.7% PCE. These PCE values are the highest reported to date for the planar perovskite–PCBM solar cells.</P> <P>Graphic Abstract</P><P>Optimal thickness of a PCBM layer and insertion of the LiF interlayer on a well-controlled flat surface of the perovskite film are essential for fabricating planar perovskite–PCBM solar cells. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4ee01216j'> </P>