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Article Dans Une Revue Superlattices and Microstructures Année : 2018

Optical and structural properties of individual Co-doped ZnO microwires

O Kolomys
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V Strelchuk
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S Rarata
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R Hayn
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Fabien Giovannelli
F Delorme
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V Tkach
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Résumé

The Co-doped ZnO microwires (MWs) were grown using the optical furnace method. We used Scanning electron microscopy (SEM), polarized micro-Raman spectroscopy, photoluminescence (PL) and optical absorption spectroscopy to systematic investigation of the optical and structural properties of Co-doped ZnO MWs. The SEM analysis reveals that Co-doped ZnO MWs has hexagonal facets and cavity inside. The EDS results confirmed the presence and non-uniform distribution of Co impurities in the samples. Co doping of ZnO MWs leads to the decreased intensity, drastically broadening and high-energy shift of the NBE PL band. The red emission band at 1.85 eV originates from 2 E(2 G) / 4 A 2 (4 F) intra-3d-transition of Co 2þ in the ZnO lattice has been observed. The intense structured absorption bands within the near infrared ranges 3800e4800 and 5500e9000 cm À1 are caused by electronic spin-allowed transitions 4 T 2 (F)) 4 A 2 (F) and 4 T 1 (F)) 4 A 2 (F) of the tetrahedrally coordinated Co 2þ (3 d 7) ions substituting Zn 2þ ions in Co-doped ZnO MWs. Micro-Raman studies of Co doped ZnO MWs show doping/disorder induced additional modes as compared to the undoped sample. The resonant enhancement of the additional local Co-related A 1-symmetry Raman mode is observed in the parallel polarization geometryyðz; zÞy. For the Co doped ZnO MWs, the enhancement of the additional Co-related local vibration mode with an increase in the excitation photon energy is also observed in the Raman spectra.
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Dates et versions

hal-03586838 , version 1 (02-03-2022)

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O Kolomys, V Strelchuk, S Rarata, R Hayn, Adrien Savoyant, et al.. Optical and structural properties of individual Co-doped ZnO microwires. Superlattices and Microstructures, 2018, 118, pp.7 - 15. ⟨10.1016/j.spmi.2018.04.005⟩. ⟨hal-03586838⟩
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