Abstract
Electrical properties of amorphous selenium films (~2.1 μm thick) were investigated at different temperatures between 225 K and room temperature. The samples were prepared using thermal evaporation method. The capacitance and conductance were measured and analyzed to study their changes with temperature and voltage. An anomalous peak is found in the conductance- and capacitance-temperature curves at ~245 K. The phenomenon can be linked to the distribution of defect states near the mid-gap and the change in ‘effective transport energy’ at which the transport takes place.
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