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 materials microstructure was quite challenging as majority of the research works were theoretical. More importantly, providing direct evidence of the atomic scale evolution of material property was nearly impossible due to the limited analysis tools and techniques. However, with the invention of the new analysis and interpretational techniques, elucidating the correlation between material nanostructure and device characteristics has become crucial for the development of novel materials. 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. In-depth investigation of the various phenomena such as atomic-scale visualization of antisite defects such as those observed in LiFePO4 are tackled.

RESEARCH INTEREST

PUBLICATIONS

  • Seokho Moon, Sung-Jae Chang, Youngjae Kim, Odongo Francis Ngome Okello, Jiye Kim, Jaewon Kim, Hyun-Wook Jung, Ho-Kyun Ahn, Dong-Seok Kim, Si-Young Choi, J.D. Lee, Jong-Won Lim, Jong Kyu Kim*, "Van der Waals Heterostructure of Hexagonal Boron Nitride with AlGaN/GaN Epitaxial Wafer for High-Performance Radio-frequency Applications", ACS Aplied Materials & Interfaces xx, xxx-xxx (2021, accepted)

  • Jongmin Lee†, Gi-Yeop Kim†, Seyeop Jeong, Mihyun Yang, Jong-Woo Kim, Byeong-Gwan Cho, Yongseong Choi, Sangmo Kim, Jin San Choi, Tae Kwon Lee, Jiwoong Kim, Dong Ryeol Lee, Seo Hyoung Chang, Sungkyun Park, Jong Hoon Jung, Chung Wung Bark, Tae-Young Koo, Philip J. Ryan, Kyuwook Ihm, Sanghoon Kim, Si-Young Choi*, Tae Heon Kim*, and Sanghan Lee*, "Template Engineering of Metal-to-Insulator Transition in Epitaxial Bilayer Nickelate Thin Films", ACS Applied Materials & Interfaces xx, xxx-xxx (2021, accepted) [pdf]

  • Shane Lindemann†, Julian Irwin†, Gi-Yeop Kim, Bo Wang, Kitae Eom, Jianjun Wang, Jiamian Hu, Long-Qing Chen, Si-Young Choi, Chang-Beom Eom*, and Mark S. Rzchowski*, "Low-voltage magnetoelectric coupling in membrane heterostructures", Science Advances 7, eabh2294 (2021) [pdf]

  • Odongo Francis Ngome Okello, Dong-Hwan Yang, Yu-seong Chu, Sejung Yang, and Si-Young Choi*, "Atomic-level defect modulation and characterization methods in 2D materials", APL Materials 9, 100902 (2021) [pdf]

  • Odongo Francis Ngome Okello†, Kyung-Yeon Doh†, Hye Su Kang, Kyung Song, Yong-Tae Kim, Kwang Ho Kim, Donghwa Lee*, and Si-Young Choi** († equally contributed authors), "Visualization of Transition Metal Decoration on h-BN Surface", Nano Letters xx, xxxx (2021) [pdf]