Hole Dynamics in Photoexcited Hematite Studied with Femtosecond Oxygen K-edge X-ray Absorption Spectroscopy.

Yohei Uemura Ahmed S M IsmailSang Han ParkSoonnam KwonMinseok KimHebatalla ElnaggarFederica FratiHiroki WadatiYasuyuki HirataYujun ZhangKohei YamagamiSusumu Yamamoto Iwao MatsudaUfuk HalisdemirGertjan KosterChristopher MilneMarkus Ammann Bert M Weckhuysen Frank M F DeGroot

Published in: The journal of physical chemistry letters (2022)

Hematite (α-Fe 2 O 3 ) is a photoelectrode for the water splitting process because of its relatively narrow bandgap and abundance in the earth's crust. In this study, the photoexcited state of a hematite thin film was investigated with femtosecond oxygen K-edge X-ray absorption spectroscopy (XAS) at the PAL-XFEL in order to follow the dynamics of its photoexcited states. The 200 fs decay time of the hole state in the valence band was observed via its corresponding XAS feature.

Keyphrases

high resolution
solid state
single molecule
dual energy
perovskite solar cells
machine learning
mass spectrometry
solar cells
deep learning
atomic force microscopy
antibiotic resistance genes
neural network