Abstract
In recent years, a transparent conducting oxide (TCO) SnO2 semiconductor have gained considerable attention due to their potential application in gas sensors. More number of studies on TCO oxide have focused on the semiconducting metal oxides in which an intensive argument is that the transparent semiconductors. The SnO2 thin films were deposited at 400 °C and then annealed at 500 °C and 600 °C and its structural, optical and electrical properties were characterized. The doping stoichiometric ratio was maintained as 4% and the resulting solution was sprayed on glass substrate which was kept at nozzle distance of 25 cm and the spray rate was 10 mL/min. The prepared pure SnO2 thin films have been characterized by different methods such as XRD, FESEM, UV-Vis NIR and EDAX analyses. It was found that the nanocrystalline SnO2 grains possesses structural features of the tetragonal rutile structure. Hence the prepared thin films are justified to be nanocrystalline and also the mean crystalline size decreased with respect to annealing temperature.
Highlights
Considerable research is being under process for the development of inexpensive nanocrystalline thin films of SnO2
The X-ray diffractogram of the pure SnO2 thin film prepared at the substrate temperature of Ts = 400 °C and annealed at 500 °C and 600 °C are shown in the Fig. 1
The prepared thin films are justified to be nanocrystalline and the mean crystalline size decreased with respect to annealing temperature
Summary
Considerable research is being under process for the development of inexpensive nanocrystalline thin films of SnO2. Due to its good optical properties such as transparency in visible light, reflectivity for infrared light, good electrical properties with low electrical sheet resistance, lead them to be a suitable candidate for a wide variety of applications such as gas sensors, adsorptive properties and chemical stability. It can be deposited onto glass, ceramics, SiO2 and other substrate materials [2,3]. Tin oxide thin film has been attracting interest for its applications on liquid gas sensors, solar cells and liquid crystals displays etc Many methods such as spray pyrolysis, sputtering, molecular beam epitaxy and spin coating has been used to produce thin film. The deposition and the characterization of SnO2 were reported and studied the effect of annealing temperature on standard electrical and optical properties of SnO2 thin films
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