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

Yohei Uemura,Ahmed S M Ismail,Sang Han Park,Soonnam Kwon,Minseok Kim,Hebatalla Elnaggar,Federica Frati,Hiroki Wadati,Yasuyuki Hirata,Yujun Zhang,Kohei Yamagami,Susumu Yamamoto,Iwao Matsuda,Ufuk Halisdemir,Gertjan Koster,Christopher Milne,Markus Ammann,Bert M Weckhuysen,Frank M F de Groot

JOURNAL OF PHYSICAL CHEMISTRY LETTERS（2022）

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摘要

Hematite (alpha-Fe2O3) 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.

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