Abstract
In this work, we are reporting the current conduction mechanism in ZnO thin films of various thicknesses under the dark and optical stimulus. The ZnO thin films of different thicknesses (45, 70, 110, 160, 220 nm) were grown on a glass substrate at 250 °C using the spray pyrolysis method. For photoconductivity measurements, electrodes were made using silver paste by putting a ∼1 mm gap between the electrodes. The photocurrent under UV illumination increases with increasing film thickness. Linear fitting of the data suggests the major role of space charges in the film for the rise in the photocurrent. Therefore the obtained conduction mechanism is found to be space charge-limited conduction in ZnO thin films under UV illumination.
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