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Enhancement of optical conductivity in the ultra-violet region of Cs doped ZnO sol gel thin films

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Abstract

Nano crystalline cesium (Cs) doped ZnO thin films were deposited on glass substrate by sol gel spin coating method with 1–3 mol.% doping concentration and different annealing temperatures. The deposited films were characterized by X-ray diffraction (XRD), Hall Effect, Photoluminescence (PL) and UV–Visible studies. XRD measurements reveal that all the samples abound in the wurtzite structure with polycrystalline nature. An increase in crystalline size from 19.60 to 44.54 nm is observed with the increase of doping concentration. Electrical conductivity of Cs doped ZnO films were observed from Hall effect measurements and the maximum carrier concentration obtained is 7.35 × 1018 cm−3. The near band emission (384 nm) peak intensity increases with the increase of Cs doping concentration and a maximum intensity 55,280 was observed for CZ3 film from PL spectrum. Also a low energy near infrared (NIR) emission peak centered at 1.62 eV appears for the Cs doped ZnO films. The average transmission of CZ film is 88 % and the absorption edge is red shifted with the increase of Cs doping concentration and also the optical conductivity increases in the UV region.

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Acknowledgments

This research was supported by University Grants Commission (UGC) India for financial assistance offered through a major research project.

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Authors and Affiliations

  1. Post Graduate & Research Department of Physics, Sri Paramakalyani College, Alwarkurichi, 627412, India

    R. Vettumperumal & S. Kalyanaraman

  2. Department of Applied Physics, Indian School of Mines, Dhanbad, India

    R. Thangavel

Authors
  1. R. Vettumperumal
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  2. S. Kalyanaraman
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  3. R. Thangavel
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Correspondence to S. Kalyanaraman or R. Thangavel.

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Vettumperumal, R., Kalyanaraman, S. & Thangavel, R. Enhancement of optical conductivity in the ultra-violet region of Cs doped ZnO sol gel thin films. J Sol-Gel Sci Technol 66, 206–211 (2013). https://doi.org/10.1007/s10971-013-2993-x

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  • DOI: https://doi.org/10.1007/s10971-013-2993-x

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