Abstract
In this study, electrically bistable devices were fabricated by incorporating cuprous sulfide (Cu2S) nanospheres with mean size less than 10 nm into a poly(N-vinylcarbazole) (PVK) matrix. A remarkable electrical bistability was clearly observed in the current–voltage curves of the devices due to an electric-field-induced charge transfer between the dodecanethiol-capped Cu2S nanospheres and PVK. The maximum ON/OFF current ratio reached up to value as large as 104, which was dependent on the mass ratios of Cu2S nanospheres to PVK, the amplitude of the scanning voltages, and the film thickness. The charge-transport mechanisms of the electrically bistable devices were described on the basis of the experimental results using different theoretical models of organic electronics.
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