The bistable effects of CdSe/ZnS nanoparticles embedded in a conducting polyN-vinylcarbazole (PVK) polymer layer by using flexible poly-vinylidene difluoride(PVDF) and polyethylene terephthalate (PET) substrates were investigated.Transmission electron microscopy (TEM) images revealed that CdSe/ZnSnanoparticles were formed inside the PVK polymer layer. Current–voltage(I–V) measurement on theAl/[CdSe/ZnS nanoparticles+ PVK]/ITO/PVDFand Al/[CdSe/ZnS nanoparticles+ PVK ]/ITO/PET structures at 300 K showed a nonvolatile electrical bistabilitybehavior with a flat-band voltage shift due to the existence of the CdSe/ZnSnanoparticles, indicative of trapping, storing and emission of charges in theelectronic states of the CdSe nanoparticles. A bistable behavior for the fabricatedorganic bistable device (OBD) structures is described on the basis of theI–V results. These results indicate that OBDs fabricated by embedding inorganicCdSe/ZnS nanoparticles in a conducting polymer matrix on flexible substrates areprospects for potential applications in flexible nonvolatile flash memory devices.