Journal
APPLIED PHYSICS LETTERS
Volume 91, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2769961
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The authors report field-programmable rectification in crystals of rutile TiO2. A programming voltage is applied between two Pt electrodes on the surface of a crystal. Afterwards, current can pass in the direction of the programming voltage, but not in the reverse direction. The polarity of the rectification can be reversed by applying a programming voltage of opposite sign. The effect was observed on the (110) and (100) surfaces, but not the (001) surface. The proposed mechanism is field-induced motion of oxygen vacancies, which pile up under the negative terminal, eliminating a Schottky barrier, but leaving one at the positive terminal intact.
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