“…SnO 2 films are widely used in optoelectronic applications, heat mirror coatings, photocatalysis, organic light emitting diodes, gas sensors, solar energy collectors [4][5][6][7][8][9]. There are several methods for preparing SnO 2 thin films: The screen printing technique, chemical vapor deposition, reactive evaporation, dc and rf sputtering , pulsed laser ablation, thermal evaporation, electron beam evaporation, metalorganic deposition, sol-gel deposition, spray pyrolysis and thermal evaporation [10][11][12][13][14][15][16][17][18][19]. Among these methods, spray ultrasonic has the advantages of producing high purity crystalline products and durable films in a single step [20].…”