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

Authors :: Uemura Y
Ismail ASM
Park SH
Kwon S
Kim M
Elnaggar H
Frati F
Wadati H
Hirata Y
Zhang Y
Yamagami K
Yamamoto S
Matsuda I
Halisdemir U
Koster G
Milne C
Ammann M
Weckhuysen BM
de Groot FMF
Source :: The journal of physical chemistry letters [J Phys Chem Lett] 2022 May 19; Vol. 13 (19), pp. 4207-4214. Date of Electronic Publication: 2022 May 05.
Publication Year :: 2022
Abstract: Hematite (α-Fe <subscript>2</subscript> O <subscript>3</subscript> ) 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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