Publications by authors named "Seonhong Min"
Lead halide perovskites have emerged as a new class of semiconductor materials with exceptional optoelectronic properties, sparking significant research interest in photovoltaics and light-emitting diodes. However, achieving long-term operational stability remains a critical hurdle. The soft, ionic nature of the halide perovskite lattice renders them vulnerable to various instabilities.
View Article and Find Full Text PDFHalide ion exchange seen in metal halide perovskites provide a substantial opportunity to control their halide composition and corresponding optoelectronic properties. Halide ion mixing across colloidal 3D perovskite nanocrystals have been extensively studied while the mixing within colloidal 2D counterparts remain underexplored. In this study, the halide ion exchange kinetics across colloidally stable 2D Ruddlesden-Popper layered bromide (Br) and iodide (I) perovskites using two different spacer ligands such as aromatic phenethylammonium (PEA) versus linear butyammonium (BA) is demonstrated.
View Article and Find Full Text PDFArticle Synopsis
- Lead halide perovskite nanocrystals are promising materials for solar cells and LEDs due to their adjustable optoelectronic properties, which depend on their size.
- The growth of these nanocrystals is influenced by the type of halide bonding (ionic vs. covalent), and this study compares two types: CsPbCl (ionic) and CsPbI (covalent) to investigate their growth dynamics.
- The research finds that the growth activation energy is 92 kJ/mol for CsPbCl and 71 kJ/mol for CsPbI, highlighting how different halide bonds affect growth rates and enabling better control over nanocrystal properties.