Modification of structure, surface morphology and optical band gap by variation of Co3O4 film thickness
الباحث الأول:
Sarah Abbas Shakir
الباحثين الآخرين:
Adel H. Omran Alkhayatt
المجلة:
AIP
تاريخ النشر:
4 ديسمبر، 2023
مختصر البحث:
Co3O4 Cobalt oxide thin films of various thickness about (250,450 and 600) nm were synthesized on glass heated up to 400°C temperature using spraying pyrolysis method. Influence of the cobalt oxide layer thickness on the crystal structure, surface m…
Co3O4 Cobalt oxide thin films of various thickness about (250,450 and 600) nm were synthesized on glass heated up to 400°C temperature using spraying pyrolysis method. Influence of the cobalt oxide layer thickness on the crystal structure, surface morphology, and optical parameters were investigated. The crystal structure results of the prepared samples showed that the crystallization was improved as the thickness increased with polycrystalline structure of cubic phase. The surface morphology of the prepared samples of various thickness showed a homogeneous surface without any cracks and uniform densely distribution of well-defined grains, whereas the lower film thickness has smaller grain size without pores, cracks, and pinholes. Optical characteristics revealed that the prepared films include two energy gaps for allowed direct transitions. The direct forbidden energy gap was reduced from 2.15 eV to 1.99 eV with increase film thickness. From the variation of Co3O4 properties by varying its thickness, one can be conclude that the properties of the cobalt oxide films can be controlled by film thickness, which can be used in different and suitable applications for optoelectronics, and photodetector devices.
