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The films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical absorption spectroscopy technique. The films were studied after annealing in air at temperatures 550☌, 750☌ and 950☌ for 30 min. In this work, SnO2 thin films were deposited onto alumina substrates at 350☌ by spray pyrolysis technique. ► The thickness dependence on the dark and illuminated J-V characteristics was considered. ► The absorption mechanism is due indirect allowed transition. ► The films behave as p-type semiconductor. The photovoltaic characteristics of the device were studied under 100 mW/cm2 and the effect of film thickness was also considered.► The methyl orange film shows thermal stability.

A strong rectification characteristic of Au/MO/n-Si heterojunction was obtained from the current density–voltage measurements under dark condition. An allowed indirect optical transition was observed for MO and the band gap was found to be thickness independent and equal to 2.02 eV. The optical properties of MO films were investigated by UV–vis spectrophotometry which was analyzed to obtain the electronic transition, optical band gap (Eg) and Urbach energy (E0).

This dependence was found to be typical for p-type semiconductor which was correlated with the MO molecular structure. The temperature dependence of dark electrical conductivity (σ) and Seebeck's coefficient (S) for MO thin films in the temperature range of 300–450 K have been investigated for different thicknesses in the range 300–700 nm. The crystalline structure of MO powder and films were studied by using X-ray diffraction (XRD) and their lattice parameters were found to be the same. The surface morphology of thin films was studied by using scanning electron microscopy (SEM). Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were performed for studying the thermal stability of MO. Learn more about QuickBooks Connect here.Thin films of methyl orange (MO) were successfully prepared using thermal evaporation technique from their powder.