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dc.contributor.authorShaheen, Basamat S.
dc.contributor.authorSun, Jingya
dc.contributor.authorYang, Ding-Shyue
dc.contributor.authorMohammed, Omar F.
dc.date.accessioned2017-06-14T12:17:34Z
dc.date.available2017-06-14T12:17:34Z
dc.date.issued2017-05-22
dc.identifier.citationShaheen 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.
dc.identifier.issn1948-7185
dc.identifier.pmid28514160
dc.identifier.doi10.1021/acs.jpclett.7b01116
dc.identifier.urihttp://hdl.handle.net/10754/625022
dc.description.abstractUnderstanding 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.
dc.description.sponsorshipThe 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.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/acs.jpclett.7b01116
dc.titleSpatiotemporal Observation of Electron-Impact Dynamics in Photovoltaic Materials Using 4D Electron Microscopy
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentUltrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
dc.identifier.journalThe Journal of Physical Chemistry Letters
dc.contributor.institutionDepartment of Chemistry, University of Houston , Houston, Texas 77204, United States.
kaust.personShaheen, Basamat
kaust.personSun, Jingya
kaust.personMohammed, Omar F.
dc.date.published-online2017-05-22
dc.date.published-print2017-06


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