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    A layer-by-layer ZnO nanoparticle-PbS quantum dot self-assembly platform for ultrafast interfacial electron injection

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    Type
    Article
    Authors
    Eita, Mohamed Samir
    Usman, Anwar
    El Ballouli, Ala'a
    Alarousu, Erkki
    Bakr, Osman cc
    Mohammed, Omar F. cc
    KAUST Department
    Chemical Science Program
    Functional Nanomaterials Lab (FuNL)
    KAUST Catalysis Center (KCC)
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
    Date
    2014-08-28
    Online Publication Date
    2014-08-28
    Print Publication Date
    2015-01
    Permanent link to this record
    http://hdl.handle.net/10754/563719
    
    Metadata
    Show full item record
    Abstract
    Absorbent layers of semiconductor quantum dots (QDs) are now used as material platforms for low-cost, high-performance solar cells. The semiconductor metal oxide nanoparticles as an acceptor layer have become an integral part of the next generation solar cell. To achieve sufficient electron transfer and subsequently high conversion efficiency in these solar cells, however, energy-level alignment and interfacial contact between the donor and the acceptor units are needed. Here, the layer-by-layer (LbL) technique is used to assemble ZnO nanoparticles (NPs), providing adequate PbS QD uptake to achieve greater interfacial contact compared with traditional sputtering methods. Electron injection at the PbS QD and ZnO NP interface is investigated using broadband transient absorption spectroscopy with 120 femtosecond temporal resolution. The results indicate that electron injection from photoexcited PbS QDs to ZnO NPs occurs on a time scale of a few hundred femtoseconds. This observation is supported by the interfacial electronic-energy alignment between the donor and acceptor moieties. Finally, due to the combination of large interfacial contact and ultrafast electron injection, this proposed platform of assembled thin films holds promise for a variety of solar cell architectures and other settings that principally rely on interfacial contact, such as photocatalysis. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Citation
    Eita, M., Usman, A., El-Ballouli, A. O., Alarousu, E., Bakr, O. M., & Mohammed, O. F. (2014). A Layer-by-Layer ZnO Nanoparticle-PbS Quantum Dot Self-Assembly Platform for Ultrafast Interfacial Electron Injection. Small, 11(1), 112–118. doi:10.1002/smll.201400939
    Publisher
    Wiley
    Journal
    Small
    DOI
    10.1002/smll.201400939
    PubMed ID
    25163799
    ae974a485f413a2113503eed53cd6c53
    10.1002/smll.201400939
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Catalysis Center (KCC); KAUST Solar Center (KSC)

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