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    Charge-extraction strategies for colloidal quantum dot photovoltaics

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    Type
    Article
    Authors
    Lan, Xinzheng
    Masala, Silvia
    Sargent, E. H.
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    KUS-11-009-21
    Date
    2014-03-01
    Online Publication Date
    2014-03-01
    Print Publication Date
    2014-03
    Permanent link to this record
    http://hdl.handle.net/10754/563399
    
    Metadata
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    Abstract
    The solar-power conversion efficiencies of colloidal quantum dot solar cells have advanced from sub-1% reported in 2005 to a record value of 8.5% in 2013. Much focus has deservedly been placed on densifying, passivating and crosslinking the colloidal quantum dot solid. Here we review progress in improving charge extraction, achieved by engineering the composition and structure of the electrode materials that contact the colloidal quantum dot film. New classes of structured electrodes have been developed and integrated to form bulk heterojunction devices that enhance photocharge extraction. Control over band offsets, doping and interfacial trap state densities have been essential for achieving improved electrical communication with colloidal quantum dot solids. Quantum junction devices that not only tune the optical absorption spectrum, but also provide inherently matched bands across the interface between p-and n-materials, have proven that charge separation can occur efficiently across an all-quantum-tuned rectifying junction. © 2014 Macmillan Publishers Limited.
    Citation
    Lan, X., Masala, S., & Sargent, E. H. (2014). Charge-extraction strategies for colloidal quantum dot photovoltaics. Nature Materials, 13(3), 233–240. doi:10.1038/nmat3816
    Sponsors
    The authors acknowledge J. Xu for his contributions to the figures. This publication is based in part on work supported by Award KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST), the Ontario Research Fund Research Excellence Program, the Natural Sciences and Engineering Research Council (NSERC) of Canada, and Angstrom Engineering and Innovative Technology. X. L. would like to acknowledge a scholarship from the China Scholarship Council (CSC).
    Publisher
    Springer Nature
    Journal
    Nature Materials
    DOI
    10.1038/nmat3816
    PubMed ID
    24553652
    ae974a485f413a2113503eed53cd6c53
    10.1038/nmat3816
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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