Electrical and photoelectrical properties of nondoped and doped zinc oxide films coated on glass plates by the
dip-coating method are investigated at room temperature in various ambient atmospheres. The dark conductivity
of the nondoped films exponentially decreased with decreasing film thickness while the conductivity under illumination of 350 nm light was almost constant at 100 S·cm-1 irrespective of the film thickness. Consequently thinner
films showed larger photoresponse than thicker films. This thickness dependence is explained by the variation of
ZnO particle size with the film thickness (fine particle model) and the additional effect of the Schottky barrier
generated between the film and gold electrodes.
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