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Effect of Li doping on passivation of trap states and improvement in charge transport in \(\hbox {TiO}_{2}\) thin films

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Abstract

In the framework of this study, pure and Li-doped \(\hbox {TiO}_{2}\) (0.5, 1.5, 2.5 at.%) thin film samples were synthesised via sol–gel spin coating method. The structural, morphological and optical properties were examined by using X-ray diffraction, scanning electron microscopy (SEM) and UV–Vis spectroscopy respectively. XRD pattern reveals the polycrystalline nature of Li-doped \(\hbox {TiO}_{2}\) thin films with anatase crystal phase. The average crystallite sizes were found to be in the range of 19–23 nm. The energy-dispersive X-ray spectroscopy (EDS) demonstrates the oxidation states of Ti, O and Li in the deposited thin films. The optical band gap of \(\hbox {TiO}_{2}\) thin films was varied from 3.15 to 3.26 eV on increasing Li doping. For the study of light emission properties of Li-doped \(\hbox {TiO}_{2}\) thin films, the PL spectra were recorded in the wavelength range of 350–700 nm. The doping of Li on \(\hbox {TiO}_{2}\) films show improved charge transport properties which can be used in optoelectronics and energy storage devices.

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Authors and Affiliations

  1. Semiconductor Research Lab, Department of Physics, Gurukul Kangri University, Haridwar, 249 404, India

    Mohini Panday, Gaurav K Upadhyay & L P Purohit

Authors
  1. Mohini Panday
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  2. Gaurav K Upadhyay
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  3. L P Purohit
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Correspondence to L P Purohit.

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Panday, M., Upadhyay, G.K. & Purohit, L.P. Effect of Li doping on passivation of trap states and improvement in charge transport in \(\hbox {TiO}_{2}\) thin films. Pramana - J Phys 95, 132 (2021). https://doi.org/10.1007/s12043-021-02167-0

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  • DOI: https://doi.org/10.1007/s12043-021-02167-0

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