Probing the structure-property-composition relationship in organic-inorganic tri-halide perovskites
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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.
Payne , J L , Ni , C , Harwell , J R , Krishnan Jagadamma , L , McDonald , C , Mariotti , D , Samuel , I D W & Irvine , J T S 2018 , ' Probing the structure-property-composition relationship in organic-inorganic tri-halide perovskites ' Physical Chemistry Chemical Physics , vol. In press . https://doi.org/10.1039/C8CP01871E
Physical Chemistry Chemical Physics
© 2018 The Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1039/C8CP01871E
DescriptionWe acknowledge support by the Engineering and Physical Sciences Research Council (grant codes EP/M506631/1, EP/K015540/01, EP/K022237/1 and EP/M025330/1). IDWS and JTSI acknowledge Royal Society Wolfson research merit awards.
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