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    Nanoscale Surface Photovoltage Mapping of 2D Materials and Heterostructures by Illuminated Kelvin Probe Force Microscopy

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    acs.jpcc.7b12579.pdf
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    Description:
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    Type
    Article
    Authors
    Shearer, Melinda J.
    Li, Ming-yang cc
    Li, Lain-Jong cc
    Jin, Song
    Hamers, Robert J
    KAUST Department
    KAUST Catalysis Center (KCC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2018-01-31
    Online Publication Date
    2018-01-31
    Print Publication Date
    2018-06-28
    Permanent link to this record
    http://hdl.handle.net/10754/627064
    
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    Abstract
    Nanomaterials are interesting for a variety of applications, such as optoelectronics and photovoltaics. However, they often have spatial heterogeneity, i.e. composition change or physical change in the topography or structure, which can lead to varying properties that would influence their applications. New techniques must be developed to understand and correlate spatial heterogeneity with changes in electronic properties. Here we highlight the technique of surface photovoltage-Kelvin probe force microscopy (SPV-KFM), which is a modified version of non-contact atomic force microscopy capable of imaging not only the topography and surface potential, but also the surface photovoltage on the nanoscale. We demonstrate its utility in probing monolayer WSe2-MoS2 lateral heterostructures, which form an ultrathin p-n junction promising for photovoltaic and optoelectronic applications. We show surface photovoltage maps highlighting the different photoresponse of the two material regions as a result of the effective charge separation across this junction. Additionally, we study the variations between different heterostructure flakes and emphasize the importance of controlling the synthesis and transfer of these materials to obtain consistent properties and measurements.
    Citation
    Shearer MJ, Li M-Y, Li L-J, Jin S, Hamers RJ (2018) Nanoscale Surface Photovoltage Mapping of 2D Materials and Heterostructures by Illuminated Kelvin Probe Force Microscopy. The Journal of Physical Chemistry C. Available: http://dx.doi.org/10.1021/acs.jpcc.7b12579.
    Sponsors
    This work was supported by the Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering, under Award DE-FG02-09ER46664. M.J.S. also thanks the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1256259 for support. Support was also provided by the Graduate School and the Office of the Vice Chancellor for Research and Graduate Education at the University of Wisconsin-Madison with funding from the Wisconsin Alumni Research Foundation.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.7b12579
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.jpcc.7b12579
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.jpcc.7b12579
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; Material Science and Engineering Program; KAUST Catalysis Center (KCC); KAUST Catalysis Center (KCC)

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