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Erschienen in:
15.04.2016
Studies on the structural, morphological, electrical and optical properties of (CdO) x (ZnO)1−x thin films deposited by spray pyrolysis method
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 8/2016
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Abstract
Thin films of (CdO)
x
(ZnO)1−x
were deposited at 300 °C on glass substrates for various values of x (x = 0.0, 0.2, 0.4, 0.5, 0.6, 0.8 and 1.0) by spray pyrolysis method. As deposited films were annealed at 450 °C in the air atmosphere and characterized to study the effect of annealing on the structural, morphological, electrical and optical properties of (CdO)
x
(ZnO)1−x
films. X-ray diffraction study shows that the prepared (CdO)
x
(ZnO)1−x
films are polycrystalline in nature. ZnO film (for x = 0) belongs to the hexagonal wurtzite system and CdO film (for x = 1) belongs to the cubic system and mixed films were formed for x = 0.2, 0.4 and 0.5. The surface morphology of the film shows densely packed grains for ZnO (x = 0) and the surface nature of the film varies for various values of x. Electrical studies show the film deposited for x = 0.8 acquires lowest resistivity of 8.85 × 10−4 Ω cm and highest mobility of 33 cm2/Vs. Optical transmittance varies from 86 to 47 % and the band gap energy varies from 3.25 to 2.26 eV with various levels of x.