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

[Image: see text] 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 spe...

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Detalles Bibliográficos
Autores principales: Uemura, Yohei, Ismail, Ahmed S. M., Park, Sang Han, Kwon, Soonnam, Kim, Minseok, Elnaggar, Hebatalla, Frati, Federica, Wadati, Hiroki, Hirata, Yasuyuki, Zhang, Yujun, Yamagami, Kohei, Yamamoto, Susumu, Matsuda, Iwao, Halisdemir, Ufuk, Koster, Gertjan, Milne, Christopher, Ammann, Markus, Weckhuysen, Bert M., de Groot, Frank M. F.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9125685/
https://www.ncbi.nlm.nih.gov/pubmed/35512383
http://dx.doi.org/10.1021/acs.jpclett.2c00295
Descripción
Sumario:[Image: see text] 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.

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