Abstract
Abstract High-speed transient currents are often observed in chalcogenige glasses. We explain these effects by invoking the presence of Valence Alternation Pairs (VAPs). After an electric field is applied across the chalcogenide glass, carriers can tunnel directly from the electrodes onto the appropriately charged defect centers. This leads to the appearance of potential barriers near the contacts, resulting in a rapid decay of the current. Such a mechanism cannot occur in materials without a large concentration of negatively correlated defects.
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