Articles written in Pramana – Journal of Physics

    • Effect of Li doping on passivation of trap states and improvement in charge transport in TiO$_2$ thin films


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      In the framework of this study, pure and Li-doped 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 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 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 TiO$_2$ thin films, the PL spectra were recorded in the wavelength range of 350–700 nm. The doping of Li on TiO$_2$ films show improved charge transport properties which can be used in optoelectronics and energy storage devices.

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