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    Laser Patterning of Epitaxial Graphene for Schottky Junction Photodetectors
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    Department of Physics, National University of Singapore, Singapore 117542, Singapore.
    Address correspondence to [email protected], [email protected]
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    ACS Nano

    Cite this: ACS Nano 2011, 5, 7, 5969–5975
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    https://doi.org/10.1021/nn201757j
    Published June 24, 2011
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    Abstract

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    Large-area patterning of epitaxial graphene for Schottky junction photodetectors has been demonstrated with a simple laser irradiation method. In this method, semimetal–semiconductor Schottky junctions are created in a controllable pattern between epitaxial graphene (EG) and laser-modified epitaxial graphene (LEG). The zero-biased EG-LEG-EG photodetector exhibits a nanosecond and wavelength-independent photoresponse in a broad-band spectrum from ultraviolet (200 nm) through visible to infrared light (1064 nm), distinctively different from conventional photon detectors. An efficient external photoresponsivity (or efficiency) of ∼0.1 A·W–1 is achieved with a biased interdigitated EG-LEG-EG photodetector. The fabrication method presented here opens a viable route to carbon optoelectronics for a fast and highly efficient photoconductive detector.

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    In situ photocurrent monitoring during the fabrication of single-line EG-LEG-EG junction device (video), detected signals of laser pulses over one second, pulse-energy-dependent photocurrent temporal profiles, Raman spectra of modified HOPG at different pulse energies, detailed analyses on the Raman spectra of LEG, I–V characteristics of the single-line EG-LEG-EG junction device, AFM images of EG before and after modification with laser beams and optical absorption spectra of EG and LEG. This material is available free of charge via the Internet at http://pubs.acs.org.

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    ACS Nano

    Cite this: ACS Nano 2011, 5, 7, 5969–5975
    Click to copy citationCitation copied!
    https://doi.org/10.1021/nn201757j
    Published June 24, 2011
    Copyright © 2011 American Chemical Society
    Request reuse permissions

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