Abstract
Organic-based devices with an 8 × 8 array structure using titanium dioxide nanoparticles (TiO 2 NPs) embedded in poly(9-vinylcarbazole) (PVK) film exhibited bistable resistance states and a unipolar nonvolatile memory effect. TiO 2 NPs were a key factor for realizing the bistability and the concentration of TiO 2 NPs influenced ON/OFF ratio. From electrical measurements, switching mechanism of PVK:TiO 2 NPs devices was closely associated with filamentary conduction model and it was found that the OFF state was dominated by thermally activated transport while the ON state followed tunneling transport. PVK:TiO 2 NPs memory devices in 8 × 8 array structure showed a uniform cell-to-cell switching, stable switching endurance, and a high retention time longer than 10 4 s.
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