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Microwave Photodetection in an Ultraclean Suspended Bilayer Graphene p-n Junction

Title
Microwave Photodetection in an Ultraclean Suspended Bilayer Graphene p-n Junction
Authors
Jung, M[Jung, Minkyung]Rickhaus, P[Rickhaus, Peter]Zihlmann, S[Zihlmann, Simon]Makk, P[Makk, Peter]Schonenberger, C[Schonenberger, Christian]
DGIST Authors
Jung, M[Jung, Minkyung]
Issue Date
2016-11
Citation
Nano Letters, 16(11), 6988-6993
Type
Article
Article Type
Article
Keywords
Ballistic DevicesBallistic GrapheneBallisticsBi-Layer GrapheneCharge NeutralityGrapheneMicrowaveMicrowave AbsorptionMicrowavesOptical RadiationsPhoto-ThermoelectricPhoto-Thermoelectric EffectPhotocurrentPhotocurrent SignalsPhotocurrentsPhotodetectorPhotodetectorsPhotonsRe-Configurable HardwareSemiconductor JunctionsTransport Mechanism
ISSN
1530-6984
Abstract
We explore the potential of bilayer graphene as a cryogenic microwave photodetector by studying the microwave absorption in fully suspended clean bilayer graphene p-n junctions in the frequency range of 1-5 GHz at a temperature of 8 K. We observe a distinct photocurrent signal if the device is gated into the p-n regime, while there is almost no signal for unipolar doping in either the n-n or p-p regimes. Most surprisingly, the photocurrent strongly peaks when one side of the junction is gated to the Dirac point (charge-neutrality point CNP), while the other remains in a highly doped state. This is different to previous results where optical radiation was used. We propose a new mechanism based on the phototermal effect explaining the large signal. It requires contact doping and a distinctly different transport mechanism on both sides: one side of graphene is ballistic and the other diffusive. By engineering partially diffusive and partially ballistic devices, the photocurrent can drastically be enhanced. © 2016 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/1606
DOI
10.1021/acs.nanolett.6b03078
Publisher
American Chemical Society
Related Researcher
Files:
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Collection:
Intelligent Devices and Systems Research Group1. Journal Articles


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