Experimental Investigations of Surface Photo-Charge Effect in Different Materials

Abstract This paper deals with some new experimental investigations, connected with so-called surface photo-charge effect. An experimental set-up for irradiating samples with white light is designed and it is used for investigating different types of materials: metals, superconducting, ceramics, conducting ferrites, semiconductor crystals. All of them exhibit the effect with a different response amplitude. The dependence of the signal amplitude on the incident light intensity for the different materials is plotted graphically. An experimental investigations on the influence on the modulation frequency, polarization (in the case of a monochromatic source) and propagation direction of the incident light with respect to the sample surface is carried out. ∗To whom correspondence should be addressed