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    Spatiotemporal Observation of Electron-Impact Dynamics in Photovoltaic Materials Using 4D Electron Microscopy

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    Type
    Article
    Authors
    Shaheen, Basamat S. cc
    Sun, Jingya
    Yang, Ding-Shyue cc
    Mohammed, Omar F. cc
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
    Date
    2017-05-22
    Online Publication Date
    2017-05-22
    Print Publication Date
    2017-06
    Permanent link to this record
    http://hdl.handle.net/10754/625022
    
    Metadata
    Show full item record
    Abstract
    Understanding light-triggered charge carrier dynamics near photovoltaic-material surfaces and at interfaces has been a key element and one of the major challenges for the development of real-world energy devices. Visualization of such dynamics information can be obtained using the one-of-a-kind methodology of scanning ultrafast electron microscopy (S-UEM). Here, we address the fundamental issue of how the thickness of the absorber layer may significantly affect the charge carrier dynamics on material surfaces. Time-resolved snapshots indicate that the dynamics of charge carriers generated by electron impact in the electron-photon dynamical probing regime is highly sensitive to the thickness of the absorber layer, as demonstrated using CdSe films of different thicknesses as a model system. This finding not only provides the foundation for potential applications of S-UEM to a wide range of devices in the fields of chemical and materials research, but also has impact on the use and interpretation of electron beam-induced current for optimization of photoactive materials in these devices.
    Citation
    Shaheen BS, Sun J, Yang D-S, Mohammed OF (2017) Spatiotemporal Observation of Electron-Impact Dynamics in Photovoltaic Materials Using 4D Electron Microscopy. The Journal of Physical Chemistry Letters 8: 2455–2462. Available: http://dx.doi.org/10.1021/acs.jpclett.7b01116.
    Sponsors
    The work reported here was supported by King Abdullah University of Science and Technology (KAUST). D.-S.Y. acknowledges the support from the R. A. Welch Foundation (Grant No. E-1860). The authors acknowledge B. Murali for providing standard SEM images for the CdSe films.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry Letters
    DOI
    10.1021/acs.jpclett.7b01116
    PubMed ID
    28514160
    Additional Links
    http://pubs.acs.org/doi/abs/10.1021/acs.jpclett.7b01116
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.jpclett.7b01116
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Solar Center (KSC)

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