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Title
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Photovoltaic effect and evidence of carrier multiplication in graphene vertical homojunctions with asymmetrical metal contacts
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Author
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Abstract
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| Graphene exhibits exciting potentials for high-speed wideband photodetection and high quantum efficiency solar energy harvest because of its broad spectral absorption, fast photoelectric response, and potential carrier multiplication. Although photocurrent can be generated near a metalgraphene interface in lateral devices, the photoactive area is usually limited to a tiny one-dimensional line-like interface region. Here, we report photoelectric devices based on vertical graphene two-dimensional homojunction, which is fabricated via vertically stacking four graphene monolayers with asymmetric metal contacts. The devices show excellent photovoltaic output with excitation wavelength ranging from visible light to mid-infrared. The wavelength dependence of the internal quantum efficiency gives direct evidence of the carrier multiplication effect in graphene. The simple fabrication process, easy scale-up, large photoresponsive active area, and broadband response of the vertical graphene device are very promising for practical applications in optoelectronics and photovoltaics. |
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Language
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English
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Source (journal)
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ACS nano. - -
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Publication
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2015
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ISSN
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1936-0851
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DOI
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10.1021/ACSNANO.5B02356
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Volume/pages
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9
:9
(2015)
, p. 8851-8858
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ISI
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000361935800023
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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