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We have fabricated UV-sensitive photodetectors based on colloidal CdSnanocrystals and graphene. The nanocrystals act as a sensitizer layer thatimproves light harvesting leading to high responsivity of the detector. Despitethe slow relaxation of the photogenerated charges in the nanocrystal film,faster processes allowed to detect pulses up to a repetition rate of 2 kHz. Wehave performed time-resolved analysis of the processes occurring in our hybridsystem, and discuss possible photo-induced charge transfer mechanisms.

UV Light Detection from CdS Nanocrystal Sensitized Graphene Photodetectors at kHz Frequencies