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

  • Junghun Han†, Kyoung-June Go†, Jinhyuk Jang, Sejung Yang* , and Si-Young Choi* , "Materials property mapping from atomic scale imaging via machine learning based sub-pixel processing", npj Computational Materials 8, 196 (2022) [pdf]

  • Minguk Jo, Ye-Won Seo, HyoJin Yoon, Yeon-Seo Nam, Si-Young Choi, Byung Joon Choi and Junwoo Son* , "Embedded metallic nanoparticles facilitate metastability of switchable metallic domains in Mott threshold switches", Nature communications 13, 4609 (2022) [pdf]

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    Hyung-Jin Choi, Jinhyuk Jang, Soo Young Jung, Ruiguang Ning, Min-Seok Kim, Sung-Jin Jung, Jun Young Lee, Jin Soo Park, Byung Chul Lee, Ji-Soo Jang, Seong Keun Kim, Kyu Hyoung Lee, June Hyuk Lee, Sung Ok Won, Yulan Li, Shenyang Hu, Si-Young Choi and Seung-Hyub Baek* , "Thermal stress-assisted annealing to improve the crystalline quality of an epitaxial YSZ buffer layer on Si", J. Mater. Chem. C 10, 10027-10036 (2022) [pdf]

  • Ping-Luen Ho†, Zhihao Huang†, Lei Jin, Si-Young Choi, Rafal E. Dunin-Borkowski, Joachim Mayer, Shik Chi Edman Tsang, and Xiaoyan Zhong* († equally contributed authors), "Atomic-scale determination of cation and magnetic order in the triple perovskite Sr3Fe2ReO9", Microscopy and Microanalysis (2022) [In-press]

  • Yanzhe Dong, Xiaoyan Lu*, Jinhui Fan, Si-Young Choi and Hui Li*, "Strain Engineering of Domain Coexistence in Epitaxial Lead-Titanate Thin Films", Coatings 12, 040542 (2022) [html]