Dong Ha Kim
Professor, Department of Chemistry and Nano Science, Ewha Womans University
Flexible Plasmonics and Perovskite Optoelectronics
Dong Ha Kim (1,*), Ju Won Lim (2), Ji-Eun Lee and Unyong Jeong (2)
(1) Department of Chemistry and Nano Science, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, KOREA
(2) Department of Materials Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyungbuk 37673, KOREA
Plasmonic structures and properties have already been a prime concern and exploited for diverse applications[1-3]. Recently, increasing attention has been paid to explore unique plasmonic properties on stretchable substrates. Well-defined ordered arrays of plasmonic nanostructures were fabricated on stretchable substrates and tunable plasmon-coupling-based sensing properties were comprehensively demonstrated upon extension and contraction. Regular nanoprism patterns consisting of Ag, Au and Ag/Au bilayers were constructed on the stretchable polydimethylsiloxane substrate. The plasmonic sensor based on the Ag/Au bilayer showed a 6-fold enhanced surface enhanced Raman scattering signal under 20% uniaxial extension, whereas a 3-fold increase was observed upon 6% contraction, compared with the Au nanoprism arrays. The sensory behaviors were corroborated by finite-difference time-domain simulation, demonstrating tunable electromagnetic field enhancement effect via the localized surface plasmon resonance coupling. The advanced flexible plasmonic-coupling-based devices with tunable and quantifiable performance herein suggested are expected to unlock promising potential in practical bio-sensing, biotechnological applications and optical devices.
Developing perovskite solar cells (PSCs) toward high-efficiency and low-temperature process has great potential for realization of the roll-to-roll based large-scalable and low cost next-generation renewable energy source. Herein, we report interlayer-mediated efficient ETLs with one-step processed perovskite layer for viable flexible PSCs. Utilization of a polyethyleneimine ethoxylated layer on ZnO prevents direct contact between the perovskite and ETLs, avoiding the destruction, and maintaining the inherent phase of the perovskite. As a result, the PSC employing tailor-designed ETL interfaces exhibited maximum power conversion efficiency of 15.8 %, which was superior by 25.4 % to that of a control device (12.6 %).
 S. T. Kochuveedu, Y. H. Jang, D. H. Kim,* “A Study on the Mechanism for the Interaction of Light with Noble Metal-Metal Oxide Semiconductor Nanostructures for Various Photophysical Applications”, Chem. Soc. Rev. 2013, 42(21), 8467 − 8493.
 Y. H. Jang,§ Y. J. Jang,§ S. Kim, L. N. Quan, K. Chung, D. H. Kim,* “Plasmonic Solar Cells: From Rational Design to Mechanism Overview”, Chem. Rev. 2016, 116(24), 14982 – 15034.
 H. Wang, D. H. Kim,* “Perovskites-based Photodetectors: Materials and Devices”, Chem. Soc. Rev. 2017, 46, 5204 – 5236 (front cover article).
 J.-E. Lee, C. J. Park, K. Chung, J. W. Lim, U. Jeong,* D. H. Kim,* “Viable Stretchable Plasmonics Based on Unidirectional Nanoprisms”, Nanoscale 2018, 10, 4105.
Prof. Dong Ha Kim received Ph.D. degree in the Department of Fiber and Polymer Science at Seoul National University in 2000. He carried out postdoctoral research activities in the Polymer Science and Engineering Department at the University of Massachusetts at Amherst (from 2000 to 2003) with Prof. Thomas P. Russell and in the Materials Science Department at the Max Planck Institute for Polymer Research (from 2003 to 2005) with Prof. Wolfgang Knoll. Then, he joined the Samsung Electronics Co. in the Memory Division of Semiconductor R & D Center as a senior scientist. He assumed a faculty position in the Department of Chemistry and Nano Science at Ewha Womans University in 2006, and currently is a Full Professor and Ewha Fellow. His research interests include development of hybrid nanostructures for energy storage and conversion, environmental remediation, memory devices, display devices, and biomedical diagnosis/therapy. He has authored 155 SCI publications and holds 32 Korean and 2 US patents. Currently, he is Fellow of Royal Society of Chemistry, Editorial Board Member of Scientific Reports and Advisory Board Member of Journal of Materials Chemistry A and Nanoscale.
Ewha was founded by a Methodist missionary called Mary F. Scranton in 1886. Mrs. Scranton’s first-year class consisted of a single student. It was King Kojong who gave the school its name in 1887, and “Ewha” means “Pear Blossoms.” The true idea of beauty to Ewha is to recover the image of the creator that is inherent in human and enhance the freedom and individuality in each individuals. Ewha seeks to raise intellectuals who will create and integrate culture by multilateral education and realize the three virtues, Knowledge, Goodness, and Beauty.