3.4. Electrical properties
Fig. 7 shows the variations in electrical properties of the AZO films as a function of external magnetic field. It is found that, as the magnetic field increased from 0 to 6.0 mT, electrical resistivity decreased significantly, whereas both the Hall mobility and carrier concentration increased due to the variations observed in the grain size. The electrical resistivity of the films formed at without magnetic field condition (AZO-0) was found to 4.8 Ω cm. Further increase in the magnetic field to 6.0 mT, reaches to the lower electrical resistivity value 1.0 101 Ω cm because of better Hall mobility. The decreased electrical resistivity can be explained by the growth of better crystalline AZO films through the producing of more smooth and denser films. On the other hand, decreased electrical resistivity strongly depends on the formation of larger sized grains that greatly minimizes the electron scattering throughout the film surface. The increased grain size with smooth morphology helps to reduce the film porosity. This helps to provide a less electron scattering, thus it reduces the electrical resistivity value [21]. As mentioned above, the decreased electrical resistivity confirms the additional magnetic field not only influenced on the crystalline nature and optical properties of AZO films but also affected the electrical behavior. In addition, it is observed from the Hall analysis that, both the carrier concentration and Hall mobility showed an increasing tendency from 1.4 1018 to 7.0 1018 cm3 and 0.93–8.9 cm2 V1 s1 with increase of magnetic field from 0 to 6.0 mT respectively. It is obvious from the electrical results that, the mobility showed a better changes with the electrical resistivity than the charge carrier concentration. The sharp variation in mobility was the main reason for decreased electrical resistivity for the AZO-6.0 films. The increase in carrier concentration and Hall mobility is primarily associated with the better crystallinity and grain boundaries [22]. Among the deposited films, the effect of magnetic field on the AZO films was pronounced for the AZO-6.0 films, indicating the lowest electrical resistivity value, as well as the highest Hall mobility and carrier concentration than that of films deposited at lower deposition conditions.
3.4. ไฟฟ้าคุณสมบัติ Fig. 7 shows the variations in electrical properties of the AZO films as a function of external magnetic field. It is found that, as the magnetic field increased from 0 to 6.0 mT, electrical resistivity decreased significantly, whereas both the Hall mobility and carrier concentration increased due to the variations observed in the grain size. The electrical resistivity of the films formed at without magnetic field condition (AZO-0) was found to 4.8 Ω cm. Further increase in the magnetic field to 6.0 mT, reaches to the lower electrical resistivity value 1.0 101 Ω cm because of better Hall mobility. The decreased electrical resistivity can be explained by the growth of better crystalline AZO films through the producing of more smooth and denser films. On the other hand, decreased electrical resistivity strongly depends on the formation of larger sized grains that greatly minimizes the electron scattering throughout the film surface. The increased grain size with smooth morphology helps to reduce the film porosity. This helps to provide a less electron scattering, thus it reduces the electrical resistivity value [21]. As mentioned above, the decreased electrical resistivity confirms the additional magnetic field not only influenced on the crystalline nature and optical properties of AZO films but also affected the electrical behavior. In addition, it is observed from the Hall analysis that, both the carrier concentration and Hall mobility showed an increasing tendency from 1.4 1018 to 7.0 1018 cm3 and 0.93–8.9 cm2 V1 s1 with increase of magnetic field from 0 to 6.0 mT respectively. It is obvious from the electrical results that, the mobility showed a better changes with the electrical resistivity than the charge carrier concentration. The sharp variation in mobility was the main reason for decreased electrical resistivity for the AZO-6.0 films. The increase in carrier concentration and Hall mobility is primarily associated with the better crystallinity and grain boundaries [22]. Among the deposited films, the effect of magnetic field on the AZO films was pronounced for the AZO-6.0 films, indicating the lowest electrical resistivity value, as well as the highest Hall mobility and carrier concentration than that of films deposited at lower deposition conditions.
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