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    Overcoming the Cut-Off Charge Transfer Bandgaps at the PbS Quantum Dot Interface

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    El-Ballouli Et al., AFM.pdf
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    Description:
    Accepted Manuscript
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    Type
    Article
    Authors
    El-Ballouli, Ala’a O. cc
    Alarousu, Erkki
    Kirmani, Ahmad R. cc
    Amassian, Aram cc
    Bakr, Osman cc
    Mohammed, Omar F. cc
    KAUST Department
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Date
    2015-11-17
    Online Publication Date
    2015-11-17
    Print Publication Date
    2015-12
    Permanent link to this record
    http://hdl.handle.net/10754/583887
    
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    Abstract
    Light harvesting from large size of semiconductor PbS quantum dots (QDs) with a bandgap of less than 1 eV is one of the greatest challenges precluding the development of PbS QD-based solar cells because the interfacial charge transfer (CT) from such QDs to the most commonly used electron acceptor materials is very inefficient, if it occurs at all. Thus, an alternative electron-accepting unit with a new driving force for CT is urgently needed to harvest the light from large-sized PbS QDs. Here, a cationic porphyrin is utilized as a new electron acceptor unit with unique features that bring the donor–acceptor components into close molecular proximity, allowing ultrafast and efficient electron transfer for QDs of all sizes, as inferred from the drastic photoluminescence quenching and the ultrafast formation of the porphyrin anionic species. The time-resolved results clearly demonstrate the possibility of modulating the electron transfer process between PbS QDs and porphyrin moieties not only by the size quantization effect but also by the interfacial electrostatic interaction between the positively charged porphyrin and the negatively charged QDs. This approach provides a new pathway for engineering QD-based solar cells that make the best use of the diverse photons making up the Sun's broad irradiance spectrum.
    Citation
    Overcoming the Cut-Off Charge Transfer Bandgaps at the PbS Quantum Dot Interface 2015:n/a Advanced Functional Materials
    Publisher
    Wiley
    Journal
    Advanced Functional Materials
    DOI
    10.1002/adfm.201504035
    Additional Links
    http://doi.wiley.com/10.1002/adfm.201504035
    ae974a485f413a2113503eed53cd6c53
    10.1002/adfm.201504035
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; KAUST Solar Center (KSC)

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