A selector device based on graphene–oxide heterostructures for memristor crossbar applications

Most of the potential applications of memristive devices adopt crossbar architecture for ultra-high density. One of the biggest challenges of the crossbar architecture is severe residue leakage current (sneak path) issue. A possible solution is introducing a selector device with strong nonlinear current–voltage (I–V) characteristics in series with each memristor in crossbar arrays. Here, we demonstrate a novel selector device based on graphene–oxide heterostructures, which successfully converts a typical linear TaO x memristor into a nonlinear device. The origin of the nonlinearity in the heterostructures is studied in detail, which highlights an important role of the graphene–oxide interfaces.