A. Mami, K. Ben Messaoud, O. Kamoun
Mar 1, 2019
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Journal
Journal of Materials Science: Materials in Electronics
Abstract
This paper covers a successfully grown process of iron ditelluride (FeTe2) thin films deposited on glass substrates. Structural, morphological and optical properties were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical measurements. As well as, photoluminescence (PL) spectroscopy, electrical, thermal and photocatalytic performance of iron ditelluride thin films were determined using photoluminescence spectroscopy, impedance spectroscopy technique and electro-pyroelectric method, for the first time in literature. The XRD results revealed that preferentially orientation along (111) direction at 2θ value of approximately 32.03° have been observed for FeTe2 films. Besides, the impedance spectroscopy was used to determine the resistance R, the electrical capacitance Ce, as well as the angular frequency of the maximum peak ωm depending on the effect of temperature. In addition, the activation energy was found equal to Eg = 0.23 eV for iron ditelluride thin film. The thermal measurement for the composite revealed the thermal conductivity and thermal diffusivity of FeTe2 are about 1.2 W m−1 K−1 and 3.9 × 10−7 m2 s−1, respectively. The photocatalytic activity and stability of this material under visible light irradiation towards the degradation of methylene blue dye was carried out. The iron ditelluride composite exhibited a high photocatalytic degradation performance.