Abstract Organic bistable devices (OBDs) based on [6,6]-phenyl-C85 butyric acid methyl ester (PCBM) embedded in a polymethyl methacrylate (PMMA) layer were fabricated by using a simple spin-coating technique. Atomic force microscope images showed that the surface roughness of the PCBM:PMMA composite layer was uniform. Current density–voltage curves for the memory device showed a current bistability. The maximum ON/OFF ratio of the current bistability of the OBDs was as large as 10 3. Write–read–erase–read characteristics showed OBDs with rewriteable nonvolatile memories, and the retention time of the OBDs was about 10 4 s. The ON state and the OFF state for 20 randomly-chosen cells demonstrated the high reproducibility of the fabricated OBDs.