Abstarct: In this research work we have studied the morphological, structural, optical, electrical and thermo-electrical properties of pure and doped tungsten oxide (WO3) laxyers grown on glass substrate by spray pyrolysis method. We then characterized our samples using field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV-Vis-NIR spectroscopy, current-voltage (I-V) measurement and Seebeck effect experiment. In the grown samples we have used ammonium tungstate ((NH4)2WO4) solutions, using tungstate oxide powder (WO3) (99.9 %), and ammonia solution (NH3). In fabrication of WO3 laxyers various parameters were investigated. These are including: molarity of the solution, spray rate plus annealing the samples in the air atmosphere, and finally the doping effect with Cu (WO3:Cu) and Li (WO3: Li) atoms, using lithium chloride (LiCl) and copper acetate (Cu(CH3COO)2.H2O) salts.