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Unidirectional current flow (diode-like behavior) is observed in Al/Nanostructured Porous Silicon/Al structures (Al/SP/Al) after applying a forming electric field ( E ) for a long time. We found that rectifying characteristics depend on the direction of E . The forward direction coincides with the direction of E . The diode direction switches when E is inverted. The rectification factor passes from 200 to 26 from one direction to the other, the effect is reversible and can be repeated several times.
Marín et al. (Mon,) studied this question.