UV Light Detection from CdS Nanocrystal Sensitized Graphene Photodetectors at kHz Frequencies
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- 作者：Davide Spirito ; Stefan Kudera ; Vaidotas Miseikis ; Carlo Giansante ; Camilla Coletti ; Roman Krahne
- 刊名：Journal of Physical Chemistry C
- 出版年：2015
- 出版时间：October 22, 2015
- 年：2015
- 卷：119
- 期：42
- 页码：23859-23864
- 全文大小：401K
- ISSN：1932-7455
文摘
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 photoinduced charge transfer mechanisms.