3.5. Optical properties
Optical transmittance spectra of the AZO films formed at various magnetic field strengths (0, 3.0 and 6.0 mT) were measured from spectrophotometer in the 350–850 nm wavelength range and presented in Fig. 8. It can be observed from the spectra that the transmittance properties of the AZO films were strongly influenced by the external magnetic field strength. The average optical transmittance of AZO films exhibited above 94% in the visible region. As Fig. 8 shows, the transmittance of the AZO-0 films was about 94.1% at 500 nm. When the magnetic field increased to 3.0 and 6.0 mT, significant enhancement in the optical transmittance was observed to 95.0% for AZO-3.0 films and 95.2% for AZO- 6.0 films. Similar transmittance spectra could be seen between the AZO-3.0 and AZO-6.0 films, which have better transmittance than the AZO-0 films. Significant improvement in the crystallinity of the AZO films has been responsible for the enhanced optical transmittance with minimized lattice defects through the variation in plasma density with applied magnetic field. As can be seen from the Fig. 8 that, sharp falling of optical absorption edge in the UV region. In addition, owing to development in the crystal quality of AZO films, the optical absorption edge showed a stronger blue shift phenomenon. The characteristic optical absorption coefficient (α) of AZO films can be calculated from the following equation [23]:
α=− 1/ ln T t ( )
3.5. Optical properties Optical transmittance spectra of the AZO films formed at various magnetic field strengths (0, 3.0 and 6.0 mT) were measured from spectrophotometer in the 350–850 nm wavelength range and presented in Fig. 8. It can be observed from the spectra that the transmittance properties of the AZO films were strongly influenced by the external magnetic field strength. The average optical transmittance of AZO films exhibited above 94% in the visible region. As Fig. 8 shows, the transmittance of the AZO-0 films was about 94.1% at 500 nm. When the magnetic field increased to 3.0 and 6.0 mT, significant enhancement in the optical transmittance was observed to 95.0% for AZO-3.0 films and 95.2% for AZO- 6.0 films. Similar transmittance spectra could be seen between the AZO-3.0 and AZO-6.0 films, which have better transmittance than the AZO-0 films. Significant improvement in the crystallinity of the AZO films has been responsible for the enhanced optical transmittance with minimized lattice defects through the variation in plasma density with applied magnetic field. As can be seen from the Fig. 8 that, sharp falling of optical absorption edge in the UV region. In addition, owing to development in the crystal quality of AZO films, the optical absorption edge showed a stronger blue shift phenomenon. The characteristic optical absorption coefficient (α) of AZO films can be calculated from the following equation [23]: α=− 1/ ln T t ( )
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