Kookmin University (President Jeong Seung Ryul) Graduate School of Chemistry Master's student Kim Jae Hyuk (Advisor: Kim Young Hoon) participated as first author in the paper “Dimensional tunability in SN2-based synthesis of CsPbI3 perovskite nanocrystals via regulating lattice-forming behavior of surface ligands,” published in the globally prestigious international journal Nano Research (IF: 9.0, Top 13.1% in JCR).

This research presents a novel synthesis strategy enabling simultaneous control over the dimensionality (2D~3D) and surface properties of CsPbI₃ perovskite nanocrystals. The research team precisely controlled the chemical reaction pathways of oleic acid (OA) and oleamine (OLA) in an SN2-based thermal ascending reaction. This enabled them to freely transform structures from nanoplates to nanocubes and finely tune colors. Furthermore, post-treatment utilizing OAM+–I– pairs reduced surface defects and improved photoluminescence efficiency from 71.9% to 81.7%.

This achievement is significant as it elucidates the correlation between perovskite structure and optical properties at the molecular level. It is expected to provide crucial clues for future development of high-efficiency optoelectronic devices such as LEDs, displays, and solar cells. Kim Jae Hyuk, the first author who led this research, stated his aspiration: “I will strive to conduct research at an even higher level in the future.”