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Your search keyword '"Na, Seok-In"' showing total 680 results
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680 results on '"Na, Seok-In"'

8. Optical diffraction tomography and image reconstruction to measure host cell alterations caused by divergent Plasmodium species

Author

Ong, Jessica J.Y., Oh, Jeonghun, Yong Ang, Xiang, Naidu, Renugah, Chu, Trang T.T., Hyoung Im, Jae, Manzoor, Umar, Kha Nguyen, Tuyet, Na, Seok-Won, Han, Eun-Taek, Davis, Christeen, Sun Park, Won, Chun, Wanjoo, Jun, Hojong, Jin Lee, Se, Na, Sunghun, Chan, Jerry K.Y., Park, YongKeun, Russell, Bruce, Chandramohanadas, Rajesh, and Han, Jin-Hee

Published
2023
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25. Polarization‐Dependent and Color‐Tunable Electrochromic Smart Windows: Uniaxially Oriented and Polymer‐Stabilized Viologen‐Based Liquid Crystal Networks.

Author

Pham, Huan Huu, Rim, Minwoo, Wi, Youngjae, Ko, Hyeyoon, Yu, Dongmin, Hyeong, Jaeseok, Tran, Duy Thanh, Ha, Minjeong, Na, Seok‐In, and Jeong, Kwang‐Un

Subjects
PHASE transitions, ELECTROCHROMIC windows, CHEMICAL stability, COATING processes, LIQUID crystals
Abstract

Viologen‐based reactive mesogen (VRM) is newly designed and synthesized for the development of polarization‐dependent, color‐tunable, and transparent electrochromic (EC) smart windows. By controlling electric field, the color of VRM can be intentionally tuned due to the formation of dication (D state), cation‐radical (C state), and neutral state (N state). Based on the deep understanding of phase transition of VRM, a uniaxially oriented VRM hierarchical nanostructure is successfully constructed on the macroscopic area by simple coating and self‐assembly processes. The subsequent photopolymerization significantly improves thermal, mechanical, and chemical stabilities of the VRM thin film. In addition to the control of color, the transmittance of uniaxially oriented VRM‐based EC smart window can be precisely tuned by rotating a linear polarizer. [ABSTRACT FROM AUTHOR]

Published
2024
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47. Vacuum‐Assisted Deposition of Highly Hydrophobic Self‐Assembled Monolayer for High‐Efficiency Perovskite Solar Cells.

Author

Lee, Sang‐Heon, Lee, Hyun‐Jung, Kim, Do‐Ha, Noh, Yong‐Jin, Kwon, Sung‐Nam, Kim, Do‐Hyung, and Na, Seok‐In

Subjects
SOLAR cells, MONOMOLECULAR films, PEROVSKITE, CARBAZOLE, OPEN-circuit voltage, PHOSPHONIC acids, METHYL groups
Abstract

Recently, various carbazole‐based self‐assembled monolayers (SAMs) have been investigated for use in the hole transport layer (HTL) of perovskite solar cells (PSCs). In particular, [4‐(3,6‐dimethyl‐9H‐carbazol‐9‐yl)butyl] phosphonic acid (Me‐4PACz) is attracting attention as an HTL for high‐efficiency PSC due to its potential for high open‐circuit voltage (VOC) and fill factor (FF). However, Me‐4PACz has strong hydrophobicity due to its methyl group (–CH3) and long alkyl chain (C4H8), which makes it difficult to deposit a high‐quality perovskite layer on top of conventionally coated Me‐4PACz. In this study, to overcome these limitations, a new SAM deposition method based on a vacuum‐assisted deposition (VD) process is attempted. As a result, a uniform perovskite layer is deposited on top of Me‐4PACz through a very simple VD process, achieving 20.31% efficiency, which is not only close to the highest efficiency among Me‐4PACz‐based PSCs, but also improved long‐term stability of the device. It is believed that the findings of this study can be a cornerstone for using SAM‐based HTL with high hydrophobicity in the future. [ABSTRACT FROM AUTHOR]

Published
2024
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