ADVANCED ELECTRON
MICROSCOPY & FUNCTIONAL
IMAGING LABORATORY

Our research focuses on the application of aberration-corrected
STEM with emphasis on the unprecedented atomic scale imaging
techniques aimed at unraveling and understanding the various material
property-dependent device performance.

For several decades, studying the microstructure of materials was quite challenging as most of the research works were theoretical. More importantly, providing direct evidence of atomic scale evolution of material properties was nearly impossible due to the limited analytical tools and techniques. However, with the invention of new analysis and interpretational techniques, elucidating the correlation between material nanostructure and device characteristics has become increasingly important for the development of novel materials. Our research focuses on applying aberration-corrected STEM techniques, emphasizing the unprecedented atomic scale imaging techniques to unravel and understand the material property-dependent device performance at the atomic scale. In-depth investigations of phenomena such as atomic scale visualization of antisite defects (such as those observed in LiFePO4) are tackled.

PUBLICATIONS

  • GunWoo Yoo, Taejoon Mo, Yong-Sung Kim, Chang-Won Choi, Gunho Moon, SuMin Lee, Chan-Cuk Hwang, Woo-Ju Lee, Min-Yeong Choi, JongYun Choi, Si-Young Choi*, Moon-Ho Jo* and Cheol-Joo Kim* (equally contributed authors), "Interstitially bridged van der Waals interface enabling stacking-fault-free, layer-by-layer epitaxy", ACS Nano XX, XX (2025) [DOIhttps://pubs.acs.org/doi/10.1021/acsnano.5c07577

  • Dong Kyu Lee, Sungwon Lee, Hyeji Sim, Si-Young Choi and Junwoo Son*, "Compliant Nanomembranes Enable a Crack-Free Heteroepitaxial Film with a Steep Metal-Insulator Transition beyond the Critical Thickness", Nano Letters XX, XX (2025) [DOI] https://doi.org/10.1021/acs.nanolett.5c01392

  • Jaerim Kim, Sung-Hyuk Her, Dong-Seok Kim, Bongwon Kim, Sang-Mun Jung, Jiye Kim, Hyeonwoong Hwang, Kyu-Su Kim, Yong-Tae Kim, Si-Young Choi, Jong Kyu Kim*, "Stabilized Co Single-Atom Catalyst via Ion Implantation for Efficient Hydrogen Production", Small XX, XX (2025) [DOI] https://doi.org/10.1002/smll.202505383

  • Hyun Sik Moon, Yu-Jeong Yang, Getasew Mulualem Zewdie, Geon Youn, Yi-An Chen, Yu-Peng Chang, Kai-Chi Hsiao, Ting-Han Lin, Yi-Dong Lin, Jun Kue Park, Yucheol Park, Yang-Gu Lin, Ming-Chung Wu, Yung-Jung Hsu, Hyeyoung Shin*, Si-Young Choi* and Kijung Yong*, "Tailoring Cu3Nx clusters on TiO2 nanosheets to the sub-nanometric scale for enhancing NH3 photosynthesis", Chemical Engineering Journal 515, 163915 (2025) [DOI] https://doi.org/10.1016/j.cej.2025.163915

  • Daseob Yoon, Gi-Yeop Kim, Sanbae Yu, Yujeong Lee, Si-Young Choi and Junwoo Son*, "Threading dislocation annihilation by oxygen vacancies in BaSnO3 epitaxial films with high electron mobility", Journal of Alloys and Compounds 1032, 181059 (2025) [DOI] https://doi.org/10.1016/j.jallcom.2025.181059