Study of functional properties stability of SnO2 films on the duration thermal exposure and temperature changes

Abstract

Thin films of tin oxide and composite systems based on them have found the greatest applications in solar energy. The properties of oxides depend on the obtaining technology and following processes. The choice of the optimal solution maturation time influences the functional properties of the films. In this research, solutions with the adding different volume of concentrated aqueous solution of ammonia (NH4OH) per 100 ml of the system were prepared: 0.8 ml (pH=1.40), (pH=1.46) and 1.6 ml (pH=1.49). This enabled the study of the properties of films obtained from solutions of different acidity. The resistance of the films was measured in the 10 different parts of the films. In addition, the effect of the isothermal annealing time at 2500C on the structural and optical properties of the samples was investigated. As a result of this study, there was found the correlation between an increase in the duration of annealing and a decrease in the transparency of films obtained from the SnCl4/EtOH. The annealing at temperature 2500C within 6 hours led to a change in transparency of films from 93% (λ=550nm) to 88%. The further increase of the annealing duration up to 9 hours does not affect the transparency of films