Probing the structure-property-composition relationship in organic-inorganic tri-halide perovskites
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Date
16/07/2018Author
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Grant ID
EP/K022237/1
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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.
Citation
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
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Physical Chemistry Chemical Physics
Status
Peer reviewed
ISSN
1463-9076Type
Journal article
Description
We 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.Collections
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