Abstract
Co3O4 thin layers were produced through spray pyrolysis, varying the spray duration from 10 to 25 minutes. Various characterizations were employed to explore the impact of spray durations on the sprayed layers properties. They exhibited a cubic structure with strong preferred orientation along the (111) direction. Morphological analysis indicated a good morphology as the duration increased. Compositional analysis confirmed the predominant presence of Co and O in the growing layer. Optical properties revealed an augmentation in absorption with prolonged duration. The band-gap energy decreased from 1.45 to 1.40 eV for durations from 10 to 20 minutes. The optical and electrical properties were influenced by duration. Notably, Co3O4 (20 minutes) exhibited a significant variation in resistance between light ON and OFF. These findings highlight the ability to tailor the properties of Co3O4 compound by optimizing the spray duration for the effective fabrication of photo-sensors.
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