Related Experiment Video
Updated: Jun 5, 2025
08:30
Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
16.5K
Enhancing Interlayer Charge Transport of Two-Dimensional Perovskites by Structural Stabilization via Fluorine
Elizabeth Stippell1, Wei Li2, Claudio Quarti3
1Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States.
ACS Applied Materials & Interfaces
|December 16, 2024
Summary
Fluorinating ligands in 2D perovskites enhances charge transport for better solar cells. This strategy improves material stability and device performance by reducing atomic fluctuations.
Area of Science:
- Materials Science
- Solid-State Physics
- Photovoltaics
Background:
- Two-dimensional (2D) lead-halide perovskites offer enhanced stability over 3D counterparts for optoelectronics.
- Interlayer ligands in 2D perovskites improve chemical stability but impede charge transport, limiting device efficiency.
Purpose of the Study:
- To investigate the impact of ligand fluorination on charge transport in 2D perovskites.
- To elucidate the atomistic mechanisms behind charge transport enhancement via ligand modification.
Main Methods:
- Utilized a recently developed ab initio simulation methodology.
- Analyzed structural order, thermal atomic fluctuations, and reorganization energy.
Main Results:
- Ligand fluorination enhanced both hole and electron mobility by 1-2 orders of magnitude.
- Mobility increase attributed to improved structural order and reduced thermal fluctuations, not electronic coupling.
- Stronger hydrogen bonding and dipolar interactions in fluorinated ligands reduced reorganization energy.
Conclusions:
- Fluorination of interlayer ligands is a viable strategy to simultaneously enhance chemical stability and charge transport in 2D perovskites.
- Robust interlayer ligands benefit both material stability and device performance.
- Provides guidelines for designing next-generation efficient perovskite materials for solar energy applications.
Keywords:
Marcus theorycharge transportelectron-vibrational interactionsmetal halide perovskitesoptoelectronicsreorganization energysolar energytwo-dimensionalMore Related Videos
Related Concept Videos
02:42Ionic Crystal Structures
14.1K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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...
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...
14.1K
02:48Ionic Bonding and Electron Transfer
41.2K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
41.2K
03:07Electron Affinity
35.2K
The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
35.2K
03:24Hybridization of Atomic Orbitals I
46.5K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
46.5K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
41.4K
Tetrahedral 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,...
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,...
41.4K
03:35Hybridization of Atomic Orbitals II
31.8K
sp3d and sp3d 2 Hybridization
31.8K