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Hybrid organic-inorganic perovskites, MAPbX3 (X= halogen), containingmethylammonium (MA: CH3-NH3+) in the large voids conformed by the PbX6octahedral network, are the active absorption materials in the new generationof solar cells. CH3NH3PbBr3 is a promising alternative with a large band-gapthat gives rise to a high open circuit voltage. A deep knowledge of the crystalstructure and, in particular, the MA conformation inside the perovskite cageacross the phase transitions undergone below room temperature, seems essentialto establish structure-property correlations that may drive to furtherimprovements. The presence of protons requires the use of neutrons, combinedwith synchrotron XRD data that help to depict subtle symmetry changes undergoneupon cooling. We present a consistent picture of the structural features ofthis fascinating material, in complement with photocurrent measurements from aphotodetector device, demonstrating the potential of MAPbBr3 inoptoelectronics.

Elucidating the Methylammonium (MA) Conformation in MAPbBr3 Perovskite with Application in Solar Cells