Journal of the American Chemical Society, Vol.129, No.12, 3486-3486, 2007
A memory effect controlled by a pulsed voltage in photoinduced conductivity switching in an organic charge-transfer salt
We report that the photoinduced high conductivity (HC) state in the organic charge-transfer salt alpha-(BEDT-TTF)(2)I-3, which is initially triggered by a pulsed voltage and synchronous photoirradiation, can be repeatedly recovered without further photoirradiation by application of a pulsed voltage even after the current has been reduced to zero. The recovery to the HC state can be controlled by adjusting the pulse width and/or amplitude. By proper selection of pulsed voltage parameters, the switching can be made reversible or irreversible. Hysteresis loops in the current-voltage and current-irradiation intensity curves of the circuit demonstrate a memory effect with potential application in unconventional photoswitching operations. The characteristic of the hysteresis loop and current bistability can be flexibly varied by changing the width of the applied pulsed voltage.