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

Abstract

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

11 pages, 5 figures

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Cited by in corpus (3)

• Graphene-based light sensing: fabrication, characterisation, physical properties and performance
• Perfecting the Growth and Transfer of Large Single-Crystal CVD Graphene: A Platform Material for Optoelectronic Applications
• There's Plenty of Surface at the Bottom: Surface Chemistry Enhances Light Absorption by Colloidal Semiconductor Nanocrystals