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.

PUBLICATIONS

  • Hyeji Sim, Kyung-Yeon Doh, Yunkyu Park, Kyung Song, Gi-Yeop Kim, Junwoo Son, Donghwa Lee*, Si-Young Choi* († equally contributed authors), "Crystallographic Pathways to Tailoring Metal-Insulator Transition through Oxygen Transport in VO2", Small xx, 2402260 (2024) [pdf]

  • Heonsu Ahn, Gunho Moon, Hang-gyo Jung, Bingchen Deng, Dong-Hwan Yang, Sera Yang, Cheolhee Han, Hyunje Cho, Youngki Yeo, Cheol-Joo Kim, Chan-Ho Yang, Jonghwan Kim, Si-Young Choi, Hongkun Park, Jongwook Jeon, Jin-Hong Park & Moon-Ho Jo* († equally contributed authors), "Integrated 1D epitaxial mirror twin boundaries for ultrascaled 2D MoS2 field-effect transistors", Nature Nanotechnology xx, xx (2024) [pdf]

  • Jiye Kim, Jaesub Song, Hyunjoung Kwak, Chang-Won Choi, Kyungmi Noh, Seokho Moon, Hyeonwoong Hwang, Inyong Hwang, Hokyeong Jeong, Si-Young Choi, Seyoung Kim, Jong Kyu Kim*, "Attojoule Hexagonal Boron Nitride-Based Memristor for High-Performance Neuromorphic Computing", Small xx202403737 (2024) [pdf]

  • Jieun Kim, Muqing Yu, Jung-Woo Lee, Shun-Li Shang, Gi-Yeop Kim, Pratap Pal, Jinsol Seo, Neil Campbell, Kitae Eom, Ranjani Ramachandran, Mark S. Rzchowski, Sang Ho Oh, Si-Young Choi, Zi-Kui Liu, Jeremy Levy, and Chang-Beom Eom* († equally contributed authors), Electronic-grade epitaxial (111) KTaO3 heterostructuresScience Advances 10, eadk4288 (2024) [pdf]

  • Yujeong Lee, Daseob Yoon, Yeon-Seo Nam, Sangbae Yua, Chaesung Limb, Hyeji Sim, Yunkyu Park, Jeong Woo Han, Si-Young Choi*, and Junwoo Son(† equally contributed authors), Accelerating metal nanoparticle exsolution by exploiting tolerance factor of perovskite stannateMaterials Horizons XX, XXXX (2024) [pdf]