Abstract
Photocurrents have been measured in tantalum pentoxide (Ta 2O 5) films with evaporated semitransparent electrodes. The maximum in the photocurrents at room temperature has been observed at around 270 nm, irrespective of electrode material. However, the magnitude and the polarity of the photocurrents depend on the electrode material. An aluminium electrode causes the transient photocurrent to decay over time, while a gold electrode provides a steady current with a slow initial rise. In the case of a gold electrode, electrons flow towards the tantalum the counterelectrode, being retarded by electron space charges trapped in the vicinity of the aluminium electrode.
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