Influence of the organic cation disorder on photoconductivity in ethylenediammonium lead iodide, NH3CH2NH2NH3PbI4
Anastasiia Glushkova a, Alla Arakcheeva a, Phil Pattison b, Marton Kollar a, Pavao Andricevic a, Balint Nafradi a, Laszlo Forro a, Endre Horvath a
a Institute of Physics (IPHYS), EPFL Ecole Polytechnique Federale de Lausanne, Switzerland, Station, Lausana, Switzerland
b SNBL, ESRF, Grenoble, Avenue des Martyrs, 71, Grenoble, France
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Benidorm, Spain, 2018 May 28th - 31st
Organizers: Emilio Palomares and Rene Janssen
Poster, Anastasiia Glushkova, 227
Publication date: 21st February 2018

Widespread attention has been devoted recently to semiconducting organic-inorganic lead halide perovskites, because of the excellent light absorption properties of these materials in the visible and near-infrared regions. Recently, blended samples of 3D perovskites and lower dimensional counterparts showed enhanced photostability and environmental stability of perovskite solar cells. Here, we report the synthesis and crystal structure of an organic-inorganic perovskite-like compound, ethylenediammonium lead iodide, NH3CH2CH2NH3PbI4. Synchrotron-based single crystal X-ray diffraction experiments revealed that the pristine and thermally treated crystals of  ethylenediammonium lead iodide differ only in the organic cation behaviour, which is characterized by a partial disorder in the thermally treated crystal. Static, dynamic and partial disorder models of the organic cation are discussed. Based on current-voltage measurements, we observed a link between the increased disorder of ethylenediammonium in the thermally treated crystal and its photoconductivity. This compound could be a potential candidate for further interface engineering in lead halide perovskite-based optoelectronic devices.

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