Publications by authors named "Hyeon-Kyeong So"
Two-dimensional Ruddlesden-Popper series are an excellent system for tuning physical properties of the perovskite by controlling the layer number (). For instance, bandgap and exciton binding energies of the series gradually increase upon reducing via enhanced quantum and dielectric confinements. Here, we present findings that challenge the anticipated trend in electron-hole exchange interaction within (BA)MAPbBr ( = 1-3), which causes spin-dependent exciton level splitting into bright and dark states, where the latter is partially visible near the surface of the Br-based two-dimensional Ruddlesden-Popper series.
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- - Two-dimensional semiconductors, particularly 2D halide perovskite crystals, serve as an ideal environment for exploring excitons and biexcitons, though traditional photoluminescence interpretations may inaccurately estimate biexciton binding energies.
- - The study reveals that biexcitons form via the binding of two dark excitons, with a significant bright-dark energy separation affecting spectral observations, leading to an underestimation of actual binding energies.
- - Doping with manganese (Mn) enhances biexciton stability and paramagnetism, resulting in a slight increase in binding energy and exciton capture coefficient, though the measured values are still lower than previously reported, suggesting the need for reevaluation of bie