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Transient XUV spectroscopy is growing in popularity for the measurement ofsolar fuel and photovoltaic materials as it can separately measure electron andhole energies for multiple elements at once. However, interpretation oftransient XUV measurements is complicated by changes in core-valence excitonand angular momentum effects after photoexcitation. Here, we report thephotoexcited electron and hole dynamics for ZnTe, a promising material for CO2reduction, following 400 nm excitation. We apply a newly developed, ab-initiotheoretical approach based on density functional theory and the Bethe-Salpeterequation to accurately predict the excited state change in the measuredtransient XUV spectra. Electrons excited to the conduction band are measuredwith a thermalization rate of 70 $\pm$ 40 fs. Holes are excited with an averageexcess energy of ~1 eV and thermalize in 1130 $\pm$ 150 fs. The theoreticalapproach also allows an estimated assignment of inter- and intra-valleyrelaxation pathways in k-space using the relative amplitudes of thecore-valence excitons.

Measuring photoexcited electron and hole dynamics in ZnTe and modeling excited state core-valence effects in transient XUV reflection spectroscopy