Research

Ionic transport in hybrid lead iodide perovskite solar cells


Reference:

Eames, C., Frost, J. M., Barnes, P. R. F., O’regan, B. C., Walsh, A. and Islam, M. S., 2015. Ionic transport in hybrid lead iodide perovskite solar cells. Nature Communications, 6, 7497.

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    Official URL:

    http://dx.doi.org/10.1038/ncomms8497

    Abstract

    Solar cells based on organic–inorganic halide perovskites have recently shown rapidly rising power conversion efficiencies, but exhibit unusual behaviour such as current–voltage hysteresis and a low-frequency giant dielectric response. Ionic transport has been suggested to be an important factor contributing to these effects; however, the chemical origin of this transport and the mobile species are unclear. Here, the activation energies for ionic migration in methylammonium lead iodide (CH3NH3PbI3) are derived from first principles, and are compared with kinetic data extracted from the current–voltage response of a perovskite-based solar cell. We identify the microscopic transport mechanisms, and find facile vacancy-assisted migration of iodide ions with an activation energy of 0.6 eV, in good agreement with the kinetic measurements. The results of this combined computational and experimental study suggest that hybrid halide perovskites are mixed ionic–electronic conductors, a finding that has major implications for solar cell device architectures.

    Details

    Item Type Articles
    CreatorsEames, C., Frost, J. M., Barnes, P. R. F., O’regan, B. C., Walsh, A. and Islam, M. S.
    DOI10.1038/ncomms8497
    DepartmentsFaculty of Science > Chemistry
    Research CentresCentre for Sustainable Chemical Technologies
    EPSRC Centre for Doctoral Training in Statistical Mathematics (SAMBa)
    RefereedYes
    StatusPublished
    ID Code46065

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