Single-layer organic memory devices based on N,N′-di(naphthalene-l-yl)-N,N′-diphenyl-benzidine -: art. no. 023505

We report a single-layer organic electrically bistable device made of N,N-'-di(naphthalene-l-yl)-N,N-'-diphenyl-benzidine sandwiched between two electrodes. The measured current-voltage characteristics show two states of different conductivities at the same applied voltage-high-conductance state (ON state) and low-conductance state (OFF state)-and the two states are reproducible by applying a negative writing voltage. It was found that the ratio of the ON/OFF current depends strongly on the writing voltage, and the bistable characteristics were yet retained for up to hours and days before reading the device after applying a writing voltage. Furthermore, more than 10(6) write-read-erase-reread cycles have been performed in ambient conditions without degradation. These properties show the devices promising for high-density, low-cost memory application. (c) 2005 American Institute of Physics.