Speaker
Description
Wide bandgap oxides (WBGOs) have exhibited superior material properties for power electronics and optoelectronics. However, transient electronic dynamics right after high-density carrier injection into the conduction band of WBGOs has not been fully understood. In this study, we achieved transient carrier injection in a simple cubic perovskite WBGO via ultrafast above-gap photoexcitation and revealed its sub-picosecond carrier dynamics across the bandgap. A fast hot-carrier cooling lifetime of 1ps due to electron-phonon scattering along with clear exciton bleach and excitonic enhancement resulting from photo-excited free carriers are unveiled. The collective carrier behaviour under many-body interactions in this study provides fundamental information to investigate the underlying physics in perovskite WBGOs.
