1 research outputs found
Elucidating the Methylammonium (MA) Conformation in MAPbBr<sub>3</sub> Perovskite with Application in Solar Cells
Hybrid organic–inorganic
perovskites, MAPbX<sub>3</sub> (X = halogen), containing methylammonium
(MA: CH<sub>3</sub>–NH<sub>3</sub><sup>+</sup>) in the large
voids conformed by the PbX<sub>6</sub> octahedral network, are the
active absorption materials in the new generation of solar cells.
CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> is a promising member
with a large band gap that gives rise to a high open circuit voltage.
A deep knowledge of the crystal structure and, in particular, the
MA conformation inside the perovskite cage across the phase transitions
undergone below room temperature, seems essential to establish structure–property
correlations that may drive to further improvements. The presence
of protons requires the use of neutrons, combined with synchrotron
XRD data that help to depict subtle symmetry changes undergone upon
cooling. We present a consistent picture of the structural features
of this fascinating material, in complement with photocurrent measurements
from a photodetector device, demonstrating the potential of MAPbBr<sub>3</sub> in optoelectronics