Loss and recovery of bistability of organic bistable devices

The effect of voltage exceeding Vmin, the voltage corresponding to the local current minimum, on organic bistable devices is investigated. It is found that when the termination voltage VT exceeds Vmin, with the increasing VT, the bistable effect gets worse and finally lost at VT about 2Vmin. However, the bistable effect can be recovered by applying a voltage pulse with amplitude near Vmin for milliseconds or longer. The existence of localized conducting micro-channels is suggested to account for the bistable effect.