Monoclinic WO3 thin films have been effectively deposited by a simple spray pyrolysis technique at a molar concentration of 0.01 M on a glass substrate in the temperature range of 473 to 673 K. These WO3 films were used as an interlayer between the metal and the semiconductor, which formed the basic structure of the photodetector. Effect of substrate temperature on WO3 films during the process of the deposition was systematically interpreted with respect to the structural, morphological, optical and electrical properties of the WO3 films. The X-ray diffraction pattern revealed the polycrystalline nature of the prepared films with monoclinic phases. At the substrate temperature of 623 K, the nano-thin films were strongly bonded to each other as observed from the FE-SEM images. Visible and ultraviolet spectroscopies indicated the band gap (Eg) of the WO3 thin film is 3.30 eV. The dc electrical study recorded a sharp increase in the electrical conductivity of the prepared film at substrate temperature of 623 K for tungsten trioxide. It is worth noting that all diodes showed a positive photoresponse under illumination. In particular, the photodetector with the thickness of 300 nm showed higher responsivity 0.02 A/W and detection specificity 8.29 x 1010 Jones.
Chemical spraying pyrolysis technique has used to deposit tungsten oxide on glass substrates with varied concentrations ranging from 50 to 90 mM at the optimum deposition temperature of 350 ͦ C. All films exhibit a monoclinic phase, with highest structural properties at a molar concentration of 80 mM. Miller's plain at (200) was found to be the most dominant in all films. The film has a fibrous network with an increasing diameter with increasing concentration, according to FE-SEM. The EDX revealed that the ratio of W/O at the optimum concentration (80mM) was 2.62, with a stoichiometric of 68.6%. The rate of grain size grew with concentration, whereas the rate of roughness reduced with concentration, according to atomic force microscopy investigations of thin films. The mean electrical conductivity increased gradually with concentration up to 4.176 x10-8 S/cm-1 and subsequently declined to 4.542x 10-10 S/cm-1 , while the activation energy climbed gradually with concentration up to reach 0.298eV before decreasing significantly
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