Write-once-read-many-times (WORM) memory applications in a monolayer of donor/acceptor supramolecule

We demonstrate write-once-read-many-times (WORM) memory in a monolayer of a donor/acceptor (D/A) composite. Both molecular layer and multilayer films show irreversible memory-switching to a high-conducting state. The ratio between the conductivities of the two states is around 1 x 10(4). Although the individual components show a reversible nonvolatile memory or no memory at all, the composite system exhibits irreversible switching for WORM applications with a long retention time. Monolayer of a composite system as memory elements provides newer directions to introduce organic molecules in integrated electronic circuitry.