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Precise determination of optical band gap in Cr-doped semiconductor nanowires

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Abstract

Pristine and chromium-doped ZnO nanowires were prepared following the traditional co-precipitation method. X-ray diffraction data identified a pure wurtzite hexagonal crystal structure characteristic for ZnO, irrespective of the doping level. The particle size, as deduced form Williamson–Hall plots, was found to be 45–55 nm for all samples. Scanning electron microscopy revealed a clear nanowires morphology for the pure and doped samples, while elemental analysis ensured the successful Cr-doping. Distinct spectroscopic signatures of Cr-doping were revealed from a detailed deconvolution process applied to optical spectra of doped samples, where Cr3+ optical transitions were unambiguously identified at ~ 420 and ~ 665 nm. Particularly relevant, is the spectral decomposition here performed for the superimposed absorption edge (~ 385 nm) and Cr3+  optical resonance at ~ 420 nm, allowing to claim practically doping-independent optical band gap behavior in the present doping regime. This is further supported by identifying the characteristic ZnO near edge photoluminescence peak (~ 392 nm) which maintains fixed wavelength after Cr-doping. These findings contrast earlier studies on Cr-doped semiconductor nanoparticles and glass systems where the optical band gap has been largely underestimated. We attribute the inconsistence band gap values reported in literature for Cr-doped semiconductors to the proximity of Cr optical transitions to the semiconductor absorption edge.

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Authors and Affiliations

  1. Physics Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, 11884, Egypt

    Noori S. Anad, Zakaria M. Abd El-Fattah, M. M. El-Okr & H. H. El-Bahnasawy

  2. Department of Physics, College of Science, University of Anbar, Ramadi, Anbar, Iraq

    Noori S. Anad

  3. Basic Science Department, Higher Technological Institute, 10th of Ramadan City, Egypt

    M. Attallah

  4. Basic Science Department, Faculty of Engineering at Shoubra, Benha University, Cairo, Egypt

    Hanaa M. Ahmed

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  1. Noori S. Anad
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  2. Zakaria M. Abd El-Fattah
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  3. M. Attallah
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  4. Hanaa M. Ahmed
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  5. M. M. El-Okr
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  6. H. H. El-Bahnasawy
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Anad, N.S., El-Fattah, Z.M.A., Attallah, M. et al. Precise determination of optical band gap in Cr-doped semiconductor nanowires. Opt Quant Electron 54, 76 (2022). https://doi.org/10.1007/s11082-021-03462-1

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