  We report the synthesis and crystal structure of an organic inorganic
compound, ethylenediammonium lead iodide, NH3CH2CH2NH3PbI4. Synchrotron based
single crystal X-ray diffraction experiments revealed that the pristine and
thermally treated crystals differ in the organic cation behaviour, which is
characterized by a partial disorder in the thermally treated crystal. Based on
current voltage measurements, increased disorder of the organic cation is
associated with enhanced photoconductivity. This compound could be a potential
candidate for interface engineering in lead halide perovskite-based
optoelectronic devices.
