LATERAL PHOTOEFFECT OF ULTRATHIN METAL FILMS AND INDIUM TIN OXIDE FILMS DEPOSITED ON n-Si SUBSTRATE

Ultrathin metal films and indium tin oxide (ITO) films were prepared by vacuum evaporation on n-type Si substrate. These structures exhibit interesting photoelectronic properties, and lateral photovoltage was observed. The photovoltaic output can be a linear function of the position of light spot (localized illumination) with zero output for the light spot in the center; it reverses sign when the light spot scans from one side to the other side of the center position. The mechanism for this photovoltaic behavior is discussed.