Journal Article

PUBDB-2025-01450

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Role of sample thickness and self-absorption effects in simultaneous XEOL-XAS measurements on single crystalline ZnO and GaN

Levcenko, S. (Corresponding author)DESY* ; Ritter, K.Extern* ; Falk, H.Extern* ; Pfeiffelmann, T.Extern* ; Trefflich, L. ; Welter, E.DESY* ; Grundmann, M.Extern* ; Schnohr, C.Extern*

2025
APS College Park, MD

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Please use a persistent id in citations: doi:10.1103/PhysRevResearch.7.023066  doi:10.3204/PUBDB-2025-01450

Abstract: The x-ray excited optical luminescence (XEOL) for defect and near band edge (NBE) transitions combinedwith simultaneous x-ray absorption measurements are experimentally and theoretically studied on single crystalline ZnO and GaN across the Zn and Ga K edges, respectively, in a wide range of sample thicknesses.Increasing the sample thickness leads to the appearance of an inverted line shape and negative edge jump forthe XEOL defect response, whereas the line shape of the XEOL NBE edge remains positive. A one-dimensionaltransport model is developed, which includes experimental geometry, the creation of x-ray generated excitations,diffusion and recombination of the carriers, and reabsorption of x-ray fluorescence and XEOL photons. Themodel calculations reproduce the experimentally observed changes of the edge shape in the XEOL spectra causedby variation of the sample thickness and reveal surface recombination and optical absorption as the main factorsdetermining the XEOL edge shape for a given sample thickness.

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Contributing Institute(s):

1. FS DOOR-User (FS DOOR-User)
2. Experimentebetreuung PETRA III (FS-PET-S)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: II-20200005 (II-20200005) (II-20200005)
4. FS-Proposal: I-20220601 (I-20220601) (I-20220601)
5. 05K19OL1 - Identifizierung von Defekten durch elementspezifische Anregung optischer Lumineszenz (BMBF-05K19OL1) (BMBF-05K19OL1)

Experiment(s):

1. PETRA Beamline P65 (PETRA III)

Appears in the scientific report 2025

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