engleski

Influence of intercalated lithium on structural and electrical properties of V2O5, mixed V/Ce oxide and Fe2O3

We have prepared thin-films of V2O5, new V/Ce oxides and Fe2O3 with intercalated Li on conductive glass (SnO2:F) and glass substrate, respectively. Vanadium oxide and new V/Ce oxide films (at different concentration of V) were obtained by sol-gel process, while Fe2O3 was obtained by spray deposition technique. With different spectroscopic technique like the impedance spectroscopy (IS), thermally stimulated currents (TSC), Raman spectroscopy and grazingincidence small-angle X-ray scattering (GISAXS) at the ELETTRA synchrotron (Italy, Trieste) films were characterized. By combining these different experimental methods, the dependence of structural and electrical properties upon percentage of Li intercalated into the matrix of prepared metal-oxide films will be presented. The comparison of IS, TSC and Raman results reveals the increase of grain sizes upon inducing 1% of Li in Fe2O3 matrix followed by the decrease of grain sizes in the case of samples with 10% Li, as well as the decrease (increase) of conductivity, respectively. These changes are explained by the structural changes of grains (and grain boundaries) and with the impact of Li+ ions on the charge transfer. The average grain radius <R>, obtained by GISAXS increased in V/Ce oxide at 38 at. % of V upon the intercalation of Li+ ions. This particular morphology is quite suitable for application in electrochromic devices, in an advanced electrochemical cell concept and efficient new solar cells.

thin-films; impedance spectroscopy (IS); thermally stimulated currents (TSC); Raman spectroscopy; grazingincidence small-angle X-ray scattering (GISAXS); solar cells

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