Tungsten Trioxide Film Transmittance (2)

By comparing the magnetron sputtering method and sol-gel method producing tungsten trioxide films respectively found little difference in light transmittance. But the films producing by magnetron sputtering method the spectrum peaks and valleys more obvious that is the film producing by magnetron sputtering absorb different wavelengths light greater than the sol- gel method.

Analysis films transmission spectra which are producing by gel-sol method at different annealing temperatures before and after. Tungsten trioxide film producing by sol-gel method, the annealing temperature is higher, the lower the light transmittance of it. At 300℃ annealing for 30min, film transmittance fell by an average of 10%, peaks and valleys wavelength position will move to ultraviolet wave slightly which is not obvious. At 380℃ annealing transmittance of the film was reduced by 20% to 25%, and in the infrared portion the light transmittance decline rapidly, the peak number did not change, the difference between the peaks and troughs of the light transmittance becomes smaller. After annealing at 400 ℃ film transmittance decreased by 25% to 30%, and in the infrared portion the light transmittance decline was particularly pronounced.

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