Abstract
Effects of light and electrical current on the electrical transport properties of oxygen-deficient La7/8Sr1/8MnO3−δ thin films have been investigated. The light illumination causes a resistance drop to show photoconductivity effect. Moreover, the photoconductivity can be remarkably enhanced by increasing the electrical current, that is, it exhibits current-enhanced photoconductivity (CEPC) effect. The CEPC ratio achieves 80% at 300 K with light intensity of 56.7 mW cm−2 and electrical current of 20 μA. The phenomena are explained by a photoinduced localized insulator-metal transition and stabilization of conducting paths by the electrical current. These results may be important for practical applications in photoelectric devices.
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