Related Experiment Video
Updated: Mar 29, 2026

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
Entropy-Suppressed Ferroelectricity in Hybrid Lead-Iodide Perovskites
Alessio Filippetti1, Pietro Delugas1,2, Maria Ilenia Saba1
1Istituto Officina dei Materiali, CNR-IOM SLACS Cagliari, Cittadella Universitaria , Monserrato 09042-I Cagliari, Italy.
Abstract:
The actual nature of the electric polarization in hybrid lead-iodide perovskites is unveiled on the basis of ab initio and model results. A finite, albeit small electric polarization of few μC/cm(2) is found to be pervasive in this system, due to the polar-uncompensated alignment of methylammonium dimers, at least for temperature lower than the activation energy of dimer rotations; however, the presence of a large number of structural local minima corresponding to differently oriented polarization directions counteracts the stabilization of an ordered ferroelectric phase at the macroscale. According to our estimate, only for temperatures lower than 40-50 K a clear ferroelectric behavior is displayed. At higher temperature the polarization is progressively suppressed and the ferroelectric ordering hindered by the large configurational entropy, giving rise to a superparaelectric-like behavior at the macroscale.
More Related Videos
11:38Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
04:14Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
Related Concept Videos
Ferromagnetism
Valence Bond Theory
π Electron Effects on Chemical Shift: Overview
Ionic Association
Hybridization of Atomic Orbitals I
Theory of Strong Electrolytes