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

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Hematite (α-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.

Original languageEnglish
Pages (from-to)4207-4214
Number of pages8
JournalThe journal of physical chemistry letters
Issue number19
Early online date5 May 2022
Publication statusPublished - 19 May 2022

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