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Element-specific electronic and structural dynamics using transient X-ray spectroscopy

Liu, Hanzhe and Klein, Isabel M. and Michelsen, Jonathan M. and Cushing, Scott K. (2021) Element-specific electronic and structural dynamics using transient X-ray spectroscopy. . (Unpublished)

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Transient X-ray absorption techniques can measure ultrafast dynamics of the elemental edges in a material or multiple layer junction, giving them immense potential for deconvoluting concurrent processes. However, the interpretation of the photoexcited changes to an X-ray edge is not as simple as directly probing a transition with optical or infrared wavelengths. The core hole left by the core-level transition distorts the measured absorption and reflection spectra, both hiding and revealing different aspects of a photo-induced process. In this perspective, we describe the implementation and interpretation of transient X-ray experiments. This description includes a guide of how to choose the best wavelength and corresponding X-ray sources when designing an experiment. As an example, we focus on the rising use of extreme ultraviolet (XUV) spectroscopy for understanding performance limiting behaviors in solar energy materials, such as measurements of polaron formation, electron and hole kinetics, and charge transport in each layer of a metal-oxide-semiconductor junction. The ability of measuring photoexcited carriers in each layer of a multilayer junction could prove particularly impactful in the study of molecules, materials, and their combinations that lead to functional devices in photochemistry and photoelectrochemistry.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Liu, Hanzhe0000-0001-9001-725X
Klein, Isabel M.0000-0001-6134-6732
Cushing, Scott K.0000-0003-3538-2259
Additional Information:Attribution 4.0 International (CC BY 4.0). This material is based upon work supported by the Air Force Office of Scientific Research under award number FA9550-21-1-0022. I.M.K. was supported by an NSF Graduate Research Fellowship (DGE-1745301). J.M.M. was supported by the Liquid Sunlight Alliance, which is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Fuels from Sunlight Hub under Award Number DE-SC0021266.
Group:Liquid Sunlight Alliance
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-21-1-0022
NSF Graduate Research FellowshipDGE-1745301
Department of Energy (DOE)DE-SC0021266
Record Number:CaltechAUTHORS:20220816-192448471
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116322
Deposited By: George Porter
Deposited On:16 Aug 2022 22:39
Last Modified:16 Aug 2022 22:39

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