Flexible organic bistable devices based on [6,6]-phenyl-C85 butyric acid methyl ester clusters embedded in a polymethyl methacrylate layer

Flexible organic bistable devices (OBDs) consisting of [6,6]-phenyl-C85 butyric acid methyl ester ([84]PCBM) blended with a polymethyl methacrylate (PMMA) layer were fabricated on indium-tin-oxide (ITO) coated polyethylene terephthalate (PET) substrates. Current-voltage curves of the Al/[84]PCBM:PMMA/ITO/PET device at 300 K showed a current bistability. The maximum ON/OFF ratios of the OBDs at flat and bent conditions were about 7.5 × 102 and 2.7 × 103, respectively. The cycle endurance was larger than 1 × 105 cycles. The memory mechanisms of the OBDs were attributed to trapping and detrapping processes of electrons into and from the PCBM clusters.