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41 results on '"Kim, Un-Young"'

1. A non-linear Bishop-Phelps-Bollob\'as type theorem

Author

Dantas, Sheldon, García, Domingo, Kim, Sun Kwang, Kim, Un Young, Lee, Han Ju, and Maestre, Manuel

Subjects
Mathematics - Functional Analysis
Abstract

The main aim of this paper is to prove a Bishop-Phelps-Bollob\'as type theorem on the unital uniform algebra A_{w^*u}(B_{X^*}) consisting of all w^*-uniformly continuous functions on the closed unit ball B_{X^*} which are holomorphic on the interior of B_{X^*}. We show that this result holds for A_{w^*u}(B_{X^*}) if X^* is uniformly convex or X^* is the uniformly complex convex dual space of an order continuous absolute normed space. The vector-valued case is also studied.

Published
2017

7. Flexible Dye‐Sensitized Solar Cells

Author

Kim, Byung‐Man, primary, Han, Hyun‐Gyu, additional, Roh, Deok‐Ho, additional, Park, Junhyeok, additional, Kim, Kwang Min, additional, Kim, Un‐Young, additional, and Kwon, Tae‐Hyuk, additional

Published
2018
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10. A non-linear Bishop–Phelps–BollobÁs type theorem.

Author

Dantas, Sheldon, Kim, Un Young, García, Domingo, Maestre, Manuel, Kim, Sun Kwang, and Lee, Han Ju

Subjects
CONTINUOUS functions, BANACH spaces, DUAL space, LINEAR operators, HAUSDORFF spaces, CHOQUET theory
Abstract

The main aim of this paper is to prove a Bishop–Phelps–Bollobás type theorem on the unital uniform algebra A w * u (B X *) consisting of all w * -uniformly continuous functions on the closed unit ball B X * which are holomorphic on the interior of B X * ⁠. We show that this result holds for A w * u (B X *) if X * is uniformly convex or X * is the uniformly complex convex dual space of an order continuous absolute normed space. The vector-valued case is also studied. Throughout the paper, we consider complex Banach spaces. [ABSTRACT FROM AUTHOR]

Published
2019
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41. Surface State‐Mediated Charge Transfer of Cs2SnI6 and Its Application in Dye‐Sensitized Solar Cells.

Author

Shin, HyeonOh, Kim, Byung‐Man, Jang, Taehyung, Kim, Kwang Min, Roh, Deok‐Ho, Nam, Jung Seung, Kim, Jeong Soo, Kim, Un‐Young, Lee, Byunghong, Pang, Yoonsoo, and Kwon, Tae‐Hyuk

Subjects
CESIUM isotopes, SURFACE states, CHARGE transfer kinetics, DYE-sensitized solar cells, OXIDATION-reduction reaction, OXIDIZING agents
Abstract

A vacancy‐ordered double perovskite, Cs2SnI6, has emerged as a promising lead‐free perovskite in the optoelectronic field. However, the charge transfer kinetics mediated by its surface state remains unclear. Here, the charge transfer mechanism of Cs2SnI6 is reported and the role of its surface state in the presence of a redox mediator is clarified. Specifically, charge transfer through the surface state of Cs2SnI6 and its subsequent surface state charging are demonstrated by cyclic voltammetry and Mott–Schottky measurements, respectively. Because it is expected that the surface state of Cs2SnI6 is capable of regenerating oxidized organic dyes, a Cs2SnI6‐based regenerator is developed for a dye‐sensitized solar cell composed of fluorine‐doped tin oxide (FTO)/dyed mesoporous TiO2/regenerator/poly(3,4‐ethylenedioxythiophene)/FTO. As expected, the performance of the Cs2SnI6‐based regenerator is strongly dependent on the highest occupied molecular orbital of the dyes. Consequently, Cs2SnI6 shows efficient charge transfer with a thermodynamically favorable charge acceptor level, achieving a 79% enhancement in the photocurrent density (14.1 mA cm−2) compared with that of a conventional liquid electrolyte (7.9 mA cm−2). The results suggest that the surface state of Cs2SnI6 is the main charge transfer pathway in the presence of a redox mediator and should be considered in future designs of Cs2SnI6‐based devices. The surface state belonging to the bandgap of Cs2SnI6 is observed as the main charge transfer route in Cs2SnI6 with redox mediators, and the surface state‐mediated charge transfer of Cs2SnI6 is utilized as a charge regeneration in dye‐sensitized solar cells. [ABSTRACT FROM AUTHOR]

Published
2019
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