Hole Dynamics in Photoexcited Hematite Studied with Femtosecond Oxygen K-edge X-ray Absorption Spectroscopy
Publication date
2022-05-19
Authors
Uemura, Yohei
Ismail, Ahmed S.M.
Park, Sang Han
Kwon, Soonnam
Kim, Minseok
Elnaggar, Hebatalla
Frati, Federica
Wadati, Hiroki
Hirata, Yasuyuki
Zhang, Yujun
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Document Type
Article
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Abstract
Hematite (α-Fe 2O 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.
Keywords
SDG 7 - Affordable and Clean Energy
Citation
Uemura, Y, Ismail, A S M, Park, S H, 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, B M & de Groot, F M F 2022, 'Hole Dynamics in Photoexcited Hematite Studied with Femtosecond Oxygen K-edge X-ray Absorption Spectroscopy', The journal of physical chemistry letters, vol. 13, no. 19, pp. 4207-4214. https://doi.org/10.1021/acs.jpclett.2c00295