Controlling memory effects of three-layer structured hybrid bistable devices based on graphene sheets sandwiched between two laminated polymer layers

Three-layer structured hybrid bistable devices (HBDs) utilizing graphene sheets sandwiched between polymer layers were fabricated by laminating two glass substrates coated with patterned electrodes and spacers. The hybrid devices using polystyrene (PS) and poly(vinyl-carbazole) (PVK) as matrix layer for graphene sheets demonstrated write-once-read-many-time and volatile memory effects, respectively. It is found that the memory properties of the HBDs can be tailored by varying the depth of the charge traps formed between the polymer matrix and graphene sheets. The possible operating mechanisms of the HBDs were analyzed based on the investigation of current–voltage characteristics for the hybrid devices.

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► A tri-layer hybrid memory was fabricated by laminating two substrates with spacers.
► By using PVK as matrix for graphene sheets, the device exhibits WORM effect.
► The device shows volatile memory effect if graphene was sandwiched between PS layers.
► The behavior was due to various depth of traps formed between polymer and graphene.