Photocarrier recombination dynamics in highly excited SrTiO_3 studied by transient absorption and photoluminescence spectroscopy

摘要

We studied photocarrier recombination processes in highly excited SrTiO_3 crystals using pump-probe transient absorption (TA) and photoluminescence (PL) spectroscopy at room temperature. TA signals of nondoped SrTiO_3 crystals clearly appear in the visible and infrared spectral region under intense interband photoexcitation, and TA spectra show Drude-like photon-energy dependence. Both TA and PL decay curves are well explained by the same simple rate equation including three-body Auger recombination and single-carrier trapping.