Негативна фотопровідність у напівпровідникових гетероструктурах

Abstract

This work examines negative photoconductivity in heterogeneous semiconductor structures formed by a crystalline matrix with cylindrical amorphous inclusions. Unlike conventional photoconductivity, the effect appears as a decrease in conductivity under illumination. It is attributed to trapping of photogenerated carriers at surface and interfacial states, which induces carrier depletion near the interface. The model predicts progressive recovery of photoconductivity with increasing distance from the interface. These results are relevant for understanding charge transport and designing advanced optoelectronic devices and sensor applications.