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    Quantification of Ionic Diffusion in Lead Halide Perovskite Single Crystals

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    acsenergylett.8b00641.pdf
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    Type
    Article
    Authors
    Peng, Wei cc
    Aranda, Clara
    Bakr, Osman cc
    Garcia-Belmonte, Germà
    Bisquert, Juan
    Guerrero, Antonio
    KAUST Department
    Functional Nanomaterials Lab (FuNL)
    KAUST Catalysis Center (KCC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2018-05-25
    Online Publication Date
    2018-05-25
    Print Publication Date
    2018-07-13
    Permanent link to this record
    http://hdl.handle.net/10754/627981
    
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    Abstract
    Lead halide perovskites are mixed electronic/ionic semiconductors that have recently revolutionized the photovoltaics field. The physical characterization of the ionic conductivity has been rather elusive due to the highly intermixing of ionic and electronic current. In this work the synthesis of low defect density monocrystalline MAPbBr3 (MA=Methyl ammonium) solar cells free of hole transport layer (HTL) suppresses the effect of electronic current. Impedance spectroscopy reveals the characteristic signature of ionic diffusion (the Warburg element and transmission line equivalent circuit) and ion accumulation at the MAPbBr3/Au interface. Diffusion coefficients are calculated based on a good correlation between thickness of MAPbBr3 and characteristic diffusion transition frequency. In addition, reactive external interfaces are studied by comparison of polycrystalline MAPbBr3 devices prepared either with or without a HTL. The low frequency response in IS measurements is correlated with the chemical reactivity of moving ions with the external interfaces and diffusion into the HTL.
    Citation
    Peng W, Aranda C, Bakr OM, Garcia-Belmonte G, Bisquert J, et al. (2018) Quantification of Ionic Diffusion in Lead Halide Perovskite Single Crystals. ACS Energy Letters. Available: http://dx.doi.org/10.1021/acsenergylett.8b00641.
    Sponsors
    We acknowledge funding from Spanish Ministerio de Economía y Competitividad of Spain under Project MAT2016-76892-C3-1-R and for a Ramón y Cajal Fellowship (RYC-2014-16809). OMB and WP acknowledge the financial support of KAUST.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Energy Letters
    DOI
    10.1021/acsenergylett.8b00641
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsenergylett.8b00641
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsenergylett.8b00641
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Catalysis Center (KCC)

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