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Probing the structure-property-composition relationship in organic-inorganic tri-halide perovskites

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Julia L. Payne, Chengsheng Ni, Jonathon R. Harwell, Lethy Krishnan Jagadamma, Calum McDonald, Davide Mariotti, Ifor D. W. Samuel, John T. S. Irvine

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Abstract

Since first being used in a solar cell, the efficiencies of organic-inorganic tri-halide perovskite solar cells have rapidly increased. Although one possible mechanism for the hysteresis exhibited by these solar cells is ionic migration, the creation of vacancies in organic-inorganic tri-halide perovskites remains unexplored experimentally. Here, we have synthesised a range of samples, with the formula (CH3NH3)1-2x(H3NC2H4NH3)xPbI3, with different levels of ethylenediammonium doping to probe non-stoichiometry at the A-site of the perovskite. A region of solid solution was identified and this results in a change in photophysical properties. The influence of doping with ethylenediammonium iodide results in a decrease in HOMO level from 5.31 eV for x = 0 to -5.88 eV for x = 0.15.
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Original languageEnglish
JournalPhysical Chemistry Chemical Physics
VolumeIn press
Early online date16 Jul 2018
DOIs
Publication statusE-pub ahead of print - 16 Jul 2018

    Research areas

  • Photovoltaics, CH3NH3PbI3, Perovskite solar cells, Doping, Non-stoichiometry

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