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KIEEME 2021, Pyeongchang, Korea

June 30 - July 2, 2021 (Wed. - Fri.), Alpensia



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Design of Orthogonal Polymer Semiconductor Gels for High Physical and Chemical Resistance

Ryungyu Lee, Keun-Yeong Choi, Han Wool Park, and Do Hwan Kim, Hojin Lee


Abstract


  Presently commercialized organic light-emitting diode (OLED) displays have limitations in implementing future high-resolution displays as fine metal mask (FMM) methods are commonly utilized to implement pixel patterns. To this end, lots of research have been done through printing methodology including inkjet printing, screen printing, and organic vapor jet printing to implement high-resolution OLED pixel array. However, the printing process suffers from critical problems associated with cross contamination, pattern uniformity, and deterioration of unique physical/photoelectric characteristics during the sequential process of pixel formation. In this regard, light-emitting organic semiconductor as a core material of OLED requires physical and chemical resistance to improve durability. In this work, we propose an OLED with differentiated technologies by implementing orthogonal polymer semiconductor gel (OPSG) conversion technology that is durable against external stimuli and maintain intrinsic photoelectric propose.

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KIEEME 2021, Pyeongchang, Korea

June 30 - July 2, 2021 (Wed. - Fri.), Alpensia



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Wireless-Powered VOCs Sensor Based on Energy-Harvesting Metamaterial

Hojin Lee


Abstract


  Metamaterials, that can manipulate the electromagnetic (EM) waves and induce unique electromagnetic properties, have been explored as novel sensing platforms having superior sensing capabilities including high sensitivity, rapid sensing response, and high sensitivity owing to their high-quality resonance characteristics. However, most metamaterial-based gas sensor systems require bulky and complicated measurement system that limits real-time application.

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KIEEME 2021, Pyeongchang, Korea

June 30 - July 2, 2021 (Wed. - Fri.), Alpensia


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Electromagnetic Wave Focusing Metasurface based Novel Wireless Power Transfer System for Bio-Implantable Device

Semin Jo, Wonwoo Lee, and Hojin Lee


Abstract


  Implantable devices require miniaturization, stability, and long-term operation characteristics for monitoring and stimulation within the tissue. Generally, batteries have been used in the implantable device for long-term operation ability. However, implantable devices using batteries have limitations such as large size, short lifetime, and periodical replacement surgery. Therefore, wireless power transfer (WPT) system has been reported as alternative method to long-term operation of implantable devices. Recently, WPT systems based on metasurfaces, that exhibit exotic electromagnetic (EM) characteristics with sub-wavelength thickness, were introduced in bioelectronics to improve the efficiency and to reduce the geometrical dimension of WPT system.

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2021.07.16 20:49

KIEEME 2021, Pyeongchang

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KIEEME 2021, Pyeongchang, Korea

June 30 - July 2, 2021 (Wed. - Fri.), Alpensia


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Low-Power Capacitive Pressure Sensor Circuit Based on Coplanar a-IGZO TFTs Using Photo-Patternable Ionic Polymer Gate Dielectric

Heejoo Park, Yongchan Kim, Changhyeon Cho, and Hojin Lee


Abstract


Pressure sensor circuits based on thin-film transistors (TFTs) have emerged as promising candidates for future technologies such as human-machine interfaces, wearable health monitoring, and electronic skins. To be utilized in the future sensing system, high performance and low-operating voltage are essential factors, and, in this regard, ionic polymer electrolytes have attracted considerable attention as gate dielectric of TFT to give superior advantages including exhibit high capacitance, excellent mechanical flexibility, and optical transparency. However, most approaches for patterning ionic polymer electrolyte such as transfer or nozzle-based printing methods often suffer from low spatial resolution and inaccurate fine pattern control.

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KIEEME 2020, Pyeongchang, Korea

July 8 - 10, 2020 (Wed. - Fri.), Phoenix Park


Wi-Fi Energy-Harvesting Metamaterial and Ionic Thermoplastic Polyurethance Based Wireless VOCs Sensor System

Hojin Lee (Invited Talk)


Abstract 


  Metamaterials, that possesses powerful ability to manipulate the electromagnetic (EM) waves exhibiting the unprecedented EM properties, have attracted considerable attention as new sensing platform having great sensing capability of high sensitivity, rapid sensing response, and non-destructive detection. However, conventional metamaterial based sensor systems require expensive and complicated measurement system that limits real-time application. In this paper, wireless-powered volatile organic compound (VOCs) sensor is presented by combining energy-harvesting metamaterial (EH-MM) as wireless sensing platform and ionic thermoplastic polyurethane (i-TPU) electrolyte as a VOCs sensing material. Especially, to accomplish the practical wireless-powered sensing system, proposed EH-MM based sensor is designed to operate by harvesting the widespread commercial 2.4 GHz Wi-Fi source. When i-TPU electrolyte was exposed to VOCs, diffusivity of ionic liquid increases leading to decrease in resistance of i-TPU electrolyte that can be identified with differential harvested energy level induced from resonance property variation of the EH-MM. By analyzing variation of the energy-harvesting rate as output DC voltage levels, proposed sensor system could provide sensitive and accurate VOCs sensing results without complicated analyzing system. Also, using multi-analyte sensing capability of i-TPU electrolyte, the EH-MM sensor could classify differential VOCs including toluene, hexane, ethanol, and acetone that causes harmful effects for human by simply displaying the differential output voltage levels. Furthermore, the EH-MM sensor shows fast responses (< 1 sec), wide range of VOCs concentration (> 1000 ppm) and high stability (> 1 month) in ambient condition. As a result, a novel method for designing the simple and portable VOCs sensing system is presented offering the satisfactory sensing abilities with easily accessible sensing platform. It is expected that the proposed sensor system is expected to offer new route to real-time and wireless sensor systems which make it possible for the proposed sensor to be widely used in the various sensing applications.

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