Role of the Iodide-Methylammonium Interaction in the Ferroelectricity of CH₃ NH₃ PbI₃.

ABSTRACT: Excellent conversion efficiencies of over 20 % and facile cell production have placed hybrid perovskites at the forefront of novel solar cell materials, with CH₃ NH₃ PbI₃ being an archetypal compound. The question why CH₃ NH₃ PbI₃ has such extraordinary characteristics, particularly a very efficient power conversion from absorbed light to electrical power, is hotly debated, with ferroelectricity being a promising candidate. This does, however, require the crystal structure to be non-centrosymmetric and we herein present crystallographic evidence as to how the symmetry breaking occurs on a crystallographic and, therefore, long-range level. Although the molecular cation CH₃ NH₃ ⁺ is intrinsical

SUBMITTER: Breternitz J 

PROVIDER: S-EPMC6972664 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature