Nonvolatile write-once-read-many times memory devices based on the composites of poly(4-vinylphenol)/Vulcan XC-72

We fabricated write-once-read-many times (WORM) type organic memory devices in 8×8 cross-bar structure. The active material for organic based WORM memory devices is mixture of both poly(4-vinyphenol) (PVP) and Vulcan XC-72s. From the electrical characteristics of the WORM memory devices, we observed two different resistance states, low resistance state and high resistance state, with six orders of ON/OFF ratio (/ _ON// _OFF ∼ 10 ⁶). In addition, the WORM memory devices were maintained for longer than 50000 seconds without any serious degradation.