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    Effect of Interlayer Coupling on Ultrafast Charge Transfer from Semiconducting Molecules to Mono- and Bilayer Graphene

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    Wang_2016_PhysRevApplied.pdf (1.079Mb)
    Issue Date
    2015-07-24
    Author
    Wang, Ti
    Liu, Qingfeng
    Caraiani, Claudiu
    Zhang, Yupeng
    Wu, Judy Z.
    Chan, Wai-Lun
    Publisher
    American Physical Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Rights
    © 2015 American Physical Society
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    Abstract
    Graphene is used as flexible electrodes in various optoelectronic devices. In these applications, ultrafast charge transfer from semiconducting light absorbers to graphene can impact the overall device performance. Here, we propose a mechanism in which the charge-transfer rate can be controlled by varying the number of graphene layers and their stacking. Using an organic semiconducting molecule as a light absorber, the charge-transfer rate to graphene is measured by using time-resolved photoemission spectroscopy. Compared to graphite, the charge transfer to monolayer graphene is about 2 times slower. Surprisingly, the charge transfer to A−B–stacked bilayer graphene is slower than that to both monolayer graphene and graphite. This anomalous behavior disappears when the two graphene layers are randomly stacked. The observation is explained by a charge-transfer model that accounts for the band-structure difference in mono- and bilayer graphene, which predicts that the charge-transfer rate depends nonintuitively on both the layer number and stacking of graphene.
    URI
    http://hdl.handle.net/1808/22184
    DOI
    https://doi.org/10.1103/PhysRevApplied.4.014016
    Collections
    • Physics and Astronomy Scholarly Works [1636]
    Citation
    Wang, T., Liu, Q., Caraiani, C., Zhang, Y., Wu, J., & Chan, W.-L. (2015). Effect of Interlayer Coupling on Ultrafast Charge Transfer from Semiconducting Molecules to Mono- and Bilayer Graphene. Physical Review Applied, 4(1). doi:10.1103/physrevapplied.4.014016

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    KU Libraries
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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