| 1. |
- Conti, Giuseppina, et al.
(author)
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X-ray standing-wave spectroscopy : A powerful method for probing buried interfaces
- 2023
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In: Encyclopedia of Solid-Liquid Interfaces. - 9780323856690 ; 1-3, s. 1-335
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Book chapter (peer-reviewed)abstract
- In this chapter we present a non-destructive method for characterizing buried interfaces with high depth resolution combining X-rays standing wave and photoemission electron spectroscopy. This method incorporates the power of the X-rays photoelectron spectroscopy, which is a surface sensitive technique in the nanometer and sub-nanometer regime, with the depth selectivity of X-ray standing wave. This method has been successfully applied to study solid/solid interfaces and, more recently, solid/gas and solid/liquid interfaces, as we demonstrate on several examples. In addition, we also describe a few examples of liquid/solid interface characterization by standing wave X-ray fluorescence relevant for catalysis, energy science and biomedical applications.
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| 2. |
- Lischner, Johannes, et al.
(author)
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Accurate determination of the valence band edge in hard x-ray photoemission spectra using GW theory
- 2016
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In: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 119:16
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Journal article (peer-reviewed)abstract
- We introduce a new method for determining accurate values of the valence-band maximum in x-ray photoemission spectra. Specifically, we align the sharpest peak in the valence-band region of the experimental spectrum with the corresponding feature of a theoretical valence-band density of states curve from ab initio GW theory calculations. This method is particularly useful for soft and hard x-ray photoemission studies of materials with a mixture of valence-band characters, where strong matrix element effects can render standard methods for extracting the valence-band maximum unreliable. We apply our method to hydrogen-terminated boron-doped diamond, which is a promising substrate material for novel solar cell devices. By carrying out photoemission experiments with variable light polarizations, we verify the accuracy of our analysis and the general validity of the method. Published by AIP Publishing.
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