Related Experiment Video
Updated: Jul 26, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
Regulating structural asymmetry via fluorination engineering in hybrid lead bromide perovskites
Hua-Yang Ru1, Zhao-Yang Wang1, Hua-Li Liu1
1Henan Key Laboratory of Crystalline Molecular Functional Materials, Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China. zangsqzg@zzu.edu.cn.
Abstract:
Here, we synthesized a pair of chiral two-dimensional lead bromide perovskites R-/S-(C3H7NF3)2PbBr4 (1R/2S) using a H/F substitution strategy, which exhibit circular dichroism (CD) and circularly polarized luminescence (CPL) activity. Compared with one-dimensional non-centrosymmetric (C3H10N)3PbBr5 with local asymmetry obtained by isopropylamine, 1R/2S show a centrosymmetric inorganic layer despite the global chiral space group. Density functional theory calculations show that the formation energy of 1R/2S is lower than that of (C3H10N)3PbBr5, which implies the improved moisture stability in photophysical properties and CPL activity.
Related Concept Videos
Hybridization of Atomic Orbitals I
VSEPR Theory and the Effect of Lone Pairs
Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Hybridization of Atomic Orbitals II
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
Valence Bond Theory

