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Article

X-ray Diffraction, Micro-Raman and X-ray Photoemission Spectroscopic Investigations for Hydrothermally Obtained Hybrid Compounds of Delafossite CuGaO2 and Wurtzite ZnO

1
Field of Advanced Ceramics, Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466-8555, Japan
2
Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstraße 7, DE-91058 Erlangen, Germany
3
Frontier Research Institute of Materials Science (FRIMS), Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466-8555, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Anna Lukowiak
Ceramics 2022, 5(4), 655-672; https://doi.org/10.3390/ceramics5040048
Received: 30 August 2022 / Revised: 10 September 2022 / Accepted: 14 September 2022 / Published: 22 September 2022
(This article belongs to the Special Issue Advances in Ceramics)
P-type delafossite CuGaO2 is a wide-bandgap semiconductor for optoelectronic applications, and its lattice parameters are very similar to those of n-type semiconductor wurtzite ZnO. Accordingly, the investigation of crystalline heterostructures of CuGaO2 and ZnO has attracted significant attention. In this study, interfacial CuGaO2/ZnO hetero-compounds were examined through X-ray diffraction (XRD) analysis, confocal micro-Raman spectroscopy, and X-ray photo-electron spectroscopy (XPS). XRD and Raman analysis revealed that the hydrothermal deposition of ZnO on hexagonal platelet CuGaO2 base crystals was successful, and the subsequent reduction process could induce a unique, unprecedented reaction between CuGaO2 and ZnO, depending on the deposition parameters. XPS allowed the comparison of the binding energies (peak position and width) of the core level electrons of the constituents (Cu, Ga, Zn, and O) of the pristine CuGaO2 single crystallites and interfacial CuGaO2/ZnO hybrids. The presences of Cu2+ ions and strained GaO6 octahedra were the main characteristics of the CuGaO2/ZnO hybrid interface. The XPS and modified Auger parameter analysis gave an insight into a specific polarization of the interface, promising for further development of CuGaO2/ZnO hybrids. View Full-Text
Keywords: p-type semiconductor; hetero-interface; hydrothermal synthesis; hexagonal platelet hybrids; X-ray photoemission spectroscopy; Raman spectroscopy p-type semiconductor; hetero-interface; hydrothermal synthesis; hexagonal platelet hybrids; X-ray photoemission spectroscopy; Raman spectroscopy
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MDPI and ACS Style

Choi, M.; Brabec, C.; Hayakawa, T. X-ray Diffraction, Micro-Raman and X-ray Photoemission Spectroscopic Investigations for Hydrothermally Obtained Hybrid Compounds of Delafossite CuGaO2 and Wurtzite ZnO. Ceramics 2022, 5, 655-672. https://doi.org/10.3390/ceramics5040048

AMA Style

Choi M, Brabec C, Hayakawa T. X-ray Diffraction, Micro-Raman and X-ray Photoemission Spectroscopic Investigations for Hydrothermally Obtained Hybrid Compounds of Delafossite CuGaO2 and Wurtzite ZnO. Ceramics. 2022; 5(4):655-672. https://doi.org/10.3390/ceramics5040048

Chicago/Turabian Style

Choi, Minuk, Christoph Brabec, and Tomokatsu Hayakawa. 2022. "X-ray Diffraction, Micro-Raman and X-ray Photoemission Spectroscopic Investigations for Hydrothermally Obtained Hybrid Compounds of Delafossite CuGaO2 and Wurtzite ZnO" Ceramics 5, no. 4: 655-672. https://doi.org/10.3390/ceramics5040048

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