Abstract
Persistent post-photocurrents (PPC) have been studied in organic field-effect transistors (FET) made of thin films of regioregular poly(3-octylthiophene). The phenomenon occurs after illumination of FET with UV light. The drain-source current persisting after switching off the illumination is ca. three orders of magnitude higher than that in a virgin sample, and lasts for a long time. It may be erased by applying a negative potential to the gate electrode or by reversing the drain-source voltage. The magnitude and kinetic behaviour of the current depend on ambient atmosphere, particularly on the presence of O 2 molecules. The effect has been explained by formation of mobile O 2 - anions during irradiation. These slowly recombining anions are responsible for the occurrence of PPC. The effect may be used in opto-electronic switches.
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