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Li concentration dependence of structural properties and optical band gap of Li-doped ZnO films

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Abstract

Li-doped and undoped Zinc oxide thin film by the sol–gel method and spin-coated on glass substrate, and the effect of doping on structural, optical and stress properties have been investigated. X-ray diffraction analysis showed that all the films are polycrystalline with a hexagonal wurtzite structure. For a low amount of Li up to 12%, the texture coefficient increases with the Li amount ensuring an improvement of the c-axis orientation and the crystallinity. The crystallite size seems slightly affected and ranged in the nanometer range. Beyond this, Li amount value, the texture coefficient decreases drastically showing deterioration in the growth of ZnO along c-axis. Scanning electron microscopy (SEM) images show that the morphology of films was highly influenced by Li incorporation. For Li amount exceeding 12%, SEM images show the appearance of some cracks. The optical results revealed an improvement of the total transmission when increasing the Li amount up to 12%. A linear decrease of band gap energy with the Li content was observed. The stress was calculated and found depending on the Li amount analogously to the band gap energy. Thus, the band gap energy and the stress are correlated.

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Acknowledgements

The authors are grateful for the financial support from CNRST Morocco under Grant Number: 23UCA2015.

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Authors and Affiliations

  1. Groupe d’Étude des Matériaux Optoélectroniques (G.E.M.O), Faculté des Sciences et Techniques, Université Cadi Ayyad, Av. A. ElKhattabi, BP 549, 40000, Marrakech, Morocco

    Karima Meziane, Ahmed El Hichou, Asmae El Hamidi & Abdelmajid Almaggoussi

  2. Laboratoire Rayonnement Matière et Instrumentation, Faculté des Sciences et Techniques, Université Hassan 1, 26000, Settat, Morocco

    Mostafa Chhiba

  3. Laboratoire Procédés, Métrologie, Matériaux pour l’Énergie et Environnement (LP2M2E), Faculty of Sciences and Techniques, Department of Applied Physics, Cadi-Ayyad University, A.El Khattabi, Marrakech, Morocco

    Abdellatif Bourial

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  1. Karima Meziane
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  2. Ahmed El Hichou
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  3. Asmae El Hamidi
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  4. Mostafa Chhiba
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  5. Abdellatif Bourial
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  6. Abdelmajid Almaggoussi
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Correspondence to Ahmed El Hichou.

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Meziane, K., El Hichou, A., El Hamidi, A. et al. Li concentration dependence of structural properties and optical band gap of Li-doped ZnO films. Appl. Phys. A 123, 430 (2017). https://doi.org/10.1007/s00339-017-1039-6

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