Ontology highlight
ABSTRACT:
SUBMITTER: Chen T
PROVIDER: S-EPMC5088641 | biostudies-literature | 2016 Oct
REPOSITORIES: biostudies-literature
Science advances 20161021 10
A challenge of hybrid perovskite solar cells is device instability, which calls for an understanding of the perovskite structural stability and phase transitions. Using neutron diffraction and first-principles calculations on formamidinium lead iodide (FAPbI<sub>3</sub>), we show that the entropy contribution to the Gibbs free energy caused by isotropic rotations of the FA<sup>+</sup> cation plays a crucial role in the cubic-to-hexagonal structural phase transition. Furthermore, we observe that ...[more]