J. W. Yoon

Sungkyunkwan University, Sŏul, Seoul, South Korea

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Publications (2)1.96 Total impact

  • Source
    J. H. Lee · S. J. Kwak · J. W. Yoon · K. B. Min · M. J. Kim · S. H. Kim · S. K. Oh
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    ABSTRACT: There has been a rapidly increasing demand for the high numerical aperture (NA) in specialty optical fibers used in recent high power fiber lasers and remote sensing applications. Various polymer clad resins (PCR) have been reported aimed for a low refractive index to achieve a high NA, which resulted in a lower modulus. In this study, we report a novel PCR with a higher modulus whilst maintaining a high NA over 0.44 using newly designed fluorinated oligomer and monomer having low refractive index and high functionality. Some resins prepared various formulations using synthesized oligomers and then compared curing speed.
    Preview · Article · Nov 2008 · Proceedings of SPIE - The International Society for Optical Engineering
  • J.H. Lee · J.W. Yoon · I.G. Kim · J.S. Oh · H.J. Nam · D. Y. Jung
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    ABSTRACT: PDMS (polydimethylsiloxane) shadow masks were fabricated by replica molding using laser-patterned metal shadow masks as primary templates, which were applied to solution as well as vapor deposition to prepare patterned thin films on solid substrates. We demonstrated a method of fabricating cadmium sulfide (CdS) thin-film transistors (TFTs) using the prepared PDMS shadow masks thanks to their solution-tight, free-standing and elastic characteristics. The patterned CdS thin films were deposited by chemical solution deposition in aqueous solution and aluminum metal electrodes were deposited by thermal evaporation. The electrical characteristics of the CdS/SiO2/n-Si transistors consisted of a field effect mobility of ~0.5 cm2/Vs, a threshold voltage of ~14 V and an on/off ratio of ~107.
    No preview · Article · Jul 2008 · Thin Solid Films