Photoconductivity and enhanced memory effects in hybrid C ₆₀-graphene transistors

We describe the observation of photoconductivity and enhanced memory effects in graphene devices functionalized with clusters of alkylated C ₆₀ molecules. The alkylated C ₆₀ clusters were adsorbed on chemical vapor deposition-grown graphene devices from an aprotic medium. The resulting alkylated C ₆₀-graphene hybrid devices showed reproducible photoconductive behavior originating from the electron-accepting nature of the C ₆₀ molecules. Significantly enhanced gate hysteresis was observed upon illumination with visible light, thereby enabling the use of C ₆₀-graphene hybrid devices in three-terminal photo-memory applications.