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Oh, Joon Hak
Organic Electronics Lab
Research Interests
  • Nano Molecular Electronics, Flexible Electronics, Organic Electronic Materials
  • Fabrication of Organic and Polymer Nanomaterials and Their Applications in Nanodevices
  • Nanoelectronics Based on Graphene and Carbon Nanotubes
  • Nano-/Micro-Patterning, Self-Assembly
  • Charge Transport Phenomenon

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Graphene-Ruthenium Complex Hybrid Photodetectors with Ultrahigh Photoresponsivity

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Title
Graphene-Ruthenium Complex Hybrid Photodetectors with Ultrahigh Photoresponsivity
Author
Liu, XienLee, Eun KwangOh, Joon Hak
Keywords
graphene-ruthenium complex; field-effect transistors; photodetectors; phototransistors
Issue Date
2014-09
Publisher
WILEY-V C H VERLAG GMBH
Citation
SMALL, v.10, no.18, pp.3700 - 3706
Abstract
The maximum responsivity of a pure monolayer graphene-based photodetector is currently less than 10 mA W-1 because of small optical absorption and short recombination lifetime. Here, a graphene hybrid photodetector functionalized with a photoactive ruthenium complex that shows an ultrahigh responsivity of approximate to 1 x 10(5) A W-1 and a photoconductive gain of approximate to 3 x 10(6) under incident optical intensity of the order of sub-milliwatts is reported. This responsivity is two orders of magnitude higher than the precedent best performance of graphene-based photodetectors under a similar incident light intensity. Upon functionalization with a 4-nm-thick ruthenium complex, monolayer graphene-based photodetectors exhibit pronounced n-type doping effect due to electron transfer via the metal-ligand charge transfer (MLCT) from the ruthenium complex to graphene. The ultrahigh responsivity is attributed to the long lifetime and high mobility of the photoexcited charge carriers. This approach is highly promising for improving the responsivity of graphene-based photodetectors.
URI
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DOI
10.1002/smll.201400403
ISSN
1613-6810
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BME_Journal Papers
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