Gate-activated photoresponse in a graphene p-n junction.
basic_science · Level V
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- Record sourced from PubMed, PMID 21879753.
- Also identified by DOI 10.1021/nl2019068.
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Abstract
We study photodetection in graphene near a local electrostatic gate, which enables active control of the potential landscape and carrier polarity. We find that a strong photoresponse only appears when and where a p-n junction is formed, allowing on-off control of photodetection. Photocurrents generated near p-n junctions do not require biasing and can be realized using submicrometer gates. Locally modulated photoresponse enables a new range of applications for graphene-based photodetectors including, for example, pixilated infrared imaging with control of response on subwavelength dimensions.