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41 results on '"Lim, Yonghyun"'

12. Laminated Structure of Al2O3and TiO2for Enhancing Performance of Reverse Electrowetting-On-Dielectric Energy Harvesting

Author

Yang, Hwichul, Lee, Hojae, Lim, Yonghyun, Christy, Maria, and Kim, Young-Beom

Abstract

Reverse electrowetting-on-dielectric (REWOD) is a novel energy harvesting technique that has been gaining considerable amount of attention owing to its high power output even with the small amount of disturbance. To enhance the output power of REWOD, the dielectric layers in the system require a high capacitance. Nevertheless, current leakage is inevitable in such high-k dielectric materials. In this work, the application of a high-k dielectric material TiO2has been investigated along with a new leakage barrier layer Al2O3that acts as a lamination, in order to minimize the current leakage and maximize the power output. As expected, the laminated structure with TiO2and Al2O3exhibited reduced current leakage and relatively high capacitance compared to the single layer of TiO2or Al2O3, respectively. As the electrical energy is generated through the interaction of liquid droplets and the multilayered dielectric film, the energy-harvesting performance displayed different behavior about current generation with respect to the top surface material that is in contact with the conductive droplet. Overall, the laminated REWOD energy harvesting system produced an enhanced power density of 15.36 mW cm−2at a low bias voltage.

Published
2024
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26. Atomic layer deposition of GDC cathodic functional thin films for oxide ion incorporation enhancement.

Author

Yang, Hwichul, Lee, Hojae, Lim, Yonghyun, and Kim, Young‐Beom

Subjects
ATOMIC layer deposition, THIN films, OXIDE coating, SOLID oxide fuel cells, SURFACE chemistry
Abstract

In this paper, we report successful fabrication of a gadolinia‐doped ceria (GDC) thin film using atomic layer deposition (ALD) for improving the performance of solid oxide fuel cells (SOFCs). By varying the deposition conditions and adjusting the configuration of the ALD supercycle, the doping ratio of ALD GDC was controlled. The morphology, crystallinity, and chemical composition of ALD GDC thin films were analyzed. ALD GDC showed different surface chemistry, including oxidation states, at different doping ratios. The application of ALD GDC in a SOFC led to an output power density enhancement greater than 2.5 times. With an anodic aluminum oxide (AAO) porous support structure, an ALD GDC thin film SOFC (TF‐SOFC) showed a high power density of 288.24 mW/cm2 at an operating temperature of 450°C. [ABSTRACT FROM AUTHOR]

Published
2021
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31. Overlay control for nanoimprint lithography

Author

Fukuhara, Kazuya, additional, Suzuki, Masato, additional, Mitsuyasu, Masaki, additional, Kono, Takuya, additional, Nakasugi, Tetsuro, additional, Lim, Yonghyun, additional, and Jung, Wooyung, additional

Published
2017
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