3.1.2. Optical Properties

The optical transmittance spectra of AZO films deposited on glass and PET are shown in Figure 2. The spectra of glass and PET blank substrates are also included for reference as well as commercially available ITO/glass substrate. As seen in comparison to the blank PET substrate, the absorption edges of AZO films on glass and PET are shifted to the longer wavelengths and follow a similar transmittance behavior (around 80% transmittance in visible and near-infrared regions).

**Figure 2.** Transmittance spectra of AZO/glass and AZO/PET. Blank glass and PET spectra are also shown for reference, as well as commercial indium tin oxide (ITO)/glass.
