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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

11.6K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.6K
Ionic Crystal Structures02:42

Ionic Crystal Structures

20.4K
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...
20.4K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

49.6K
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,...
49.6K
Colors and Magnetism03:02

Colors and Magnetism

14.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.6K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.7K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.7K

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Related Experiment Video

Updated: Mar 26, 2026

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

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Ligand-Stabilized Reduced-Dimensionality Perovskites.

Li Na Quan1,2, Mingjian Yuan1, Riccardo Comin1

  • 1Department of Electrical and Computer Engineering, University of Toronto , 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.

Journal of the American Chemical Society
|February 4, 2016
PubMed
Summary

Researchers have developed more stable metal halide perovskite solar cells by introducing phenylethylammonium to create quasi-2D structures. This enhances formation energy, improving material longevity and achieving certified hysteresis-free performance.

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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Physics

Background:

  • Metal halide perovskites show great promise for thin-film solar cells.
  • Their widespread application is hindered by inherent material instabilities and degradation issues.
  • Understanding the fundamental reasons for perovskite decomposition is crucial for developing stable devices.

Purpose of the Study:

  • To investigate the intrinsic instability of metal halide perovskites.
  • To explore methods for enhancing perovskite material stability.
  • To develop reduced-dimensionality perovskite structures for improved solar cell performance and longevity.

Main Methods:

  • Density Functional Theory (DFT) calculations to analyze formation energies and interactions.
  • Materials synthesis to create quasi-2D perovskite films with tunable dimensionality.
  • Photophysical studies to assess material properties and performance.
  • Fabrication and characterization of planar perovskite solar cells.

Main Results:

  • DFT calculations revealed low formation energy as a key factor in perovskite decomposition, worsened by humidity.
  • Intercalation of phenylethylammonium introduced stabilizing van der Waals interactions, increasing formation energy.
  • Synthesized quasi-2D perovskite films demonstrated enhanced stability and maintained high performance.
  • Achieved the first certified hysteresis-free planar perovskite solar cell with 15.3% power conversion efficiency (PCE).

Conclusions:

  • The strategy of creating quasi-2D perovskites by intercalating organic cations effectively enhances material stability.
  • This approach addresses the critical instability issue in perovskite photovoltaics.
  • The developed materials offer a promising pathway towards durable and high-performance perovskite solar cells.