Related Experiment Video
Updated: Jan 15, 2026
Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
Dimensionality Reduction of Formamidinium-Rich Lead Iodide Perovskite-Derived Structures
Takuya Ohmi1,2,3, Wataru Taniguchi1, Bhawna1,4
1Materials and Structures Laboratory, Institute of Integrated Research, Institute of Science Tokyo, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan.
Researchers discovered new bulk phases of formamidinium lead iodide (FAPbI3) perovskites, FA2PbI4 and FA3PbI5. These findings enable tuning of perovskite bandgaps and optical properties by controlling structural dimensionality.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Formamidinium lead iodide (FAPbI3) is a key organic-inorganic hybrid perovskite with a cubic structure.
- Characterizing FA-rich lead iodide perovskite structures, like FA2PbI4, has been challenging due to reliance on polycrystalline thin films.
Purpose of the Study:
- To report two new bulk phases of FA-rich lead iodide perovskite-derived structures: FA2PbI4 and FA3PbI5.
- To investigate the structural dimensionality and its impact on optical properties.
Main Methods:
- Synthesis and characterization of bulk perovskite materials.
- Analysis of crystal structures to determine dimensionality of octahedral networks.
Main Results:
- Discovery of two new bulk phases: FA2PbI4 with a 2D octahedral network and FA3PbI5 with a 1D octahedral network.
- Demonstration of bandgap tunability across FA-Pb-I compositions.
- Novel approach to control perovskite structural dimensionality.
Conclusions:
- The study successfully identified new bulk phases of FA-rich lead iodide perovskites.
- Controlling structural dimensionality offers a pathway for tuning optical properties of perovskites.
More Related Videos
04:14Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
11:38Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
Related Concept Videos
02:42Ionic 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...
02:22Structures of Solids
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
01:19Acid Halides to Alcohols: LiAlH4 Reduction
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
02:18Fischer Projections
02:37Metallic Solids
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....