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    Atmospheric effects on the photovoltaic performance of hybrid perovskite solar cells

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    Type
    Article
    Authors
    Sheikh, Arif D. cc
    Bera, Ashok cc
    Haque, Mohammed
    Baby, Rakhi Raghavan
    Del Gobbo, Silvano
    Alshareef, Husam N. cc
    Wu, Tao cc
    KAUST Department
    Functional Nanomaterials and Devices Research Group
    KAUST Solar Center (KSC)
    Laboratory of Nano Oxides for Sustainable Energy
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2015-06
    Permanent link to this record
    http://hdl.handle.net/10754/564176
    
    Metadata
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    Abstract
    Organometal trihalide perovskite solar cells have recently attracted lots of attention in the photovoltaic community due to their escalating efficiency and solution processability. The most efficient organometallic mixed-halide sensitized solar cells often employ 2,2′7,7′-tetrakis-(N,N-di-p-methoxyphenyl-amine)-9,9′-spirobifluorene (spiro-MeOTAD) as the hole-transporting material. In this work, we investigated the effect of different atmospheric storage conditions, particularly vacuum, dry nitrogen, and dry air, on the photovoltaic performance of TiO2-CH3NH3PbI3-xClx-spiro-MeOTAD solar cells. We found that spin coating of spiro-MeOTAD in an oxygen atmosphere alone was not adequate to functionalize its hole-transport property completely, and our systematic experiments revealed that the device efficiency depends on the ambient atmospheric conditions during the drying process of spiro-MeOTAD. Complementary incident photon to current conversion efficiency (IPCE), light absorption and photoluminescence quenching measurements allowed us to attribute the atmosphere-dependent efficiency to the improved electronic characteristics of the solar cells. Furthermore, our Fourier transform infrared and electrical impedance measurements unambiguously detected modifications in the spiro-MeOTAD after the drying processes in different gas environments. Our findings demonstrate that proper oxidization and p-doping in functionalizing spiro-MeOTAD play a very critical role in determining device performance. These findings will facilitate the search for alternative hole-transporting materials in high-performance perovskite solar cells with long-term stability.
    Citation
    Sheikh, A. D., Bera, A., Haque, M. A., Rakhi, R. B., Gobbo, S. D., Alshareef, H. N., & Wu, T. (2015). Atmospheric effects on the photovoltaic performance of hybrid perovskite solar cells. Solar Energy Materials and Solar Cells, 137, 6–14. doi:10.1016/j.solmat.2015.01.023
    Sponsors
    The research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Solar Energy Materials and Solar Cells
    DOI
    10.1016/j.solmat.2015.01.023
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.solmat.2015.01.023
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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