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Related Concept Videos

Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

2.6K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
2.6K
Thermal Strain01:19

Thermal Strain

2.9K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

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Effect of Lone Pairs of Electrons on Molecule Geometry
53.5K
Ionic Crystal Structures02:42

Ionic Crystal Structures

18.6K
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...
18.6K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.6K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.6K
Radical Halogenation: Thermodynamics01:34

Radical Halogenation: Thermodynamics

4.6K
The thermodynamic favorability of a reaction is determined by the change in Gibbs free energy (ΔG). ΔG has two components- enthalpy (ΔH) and entropy (ΔS). The entropy component is negligible for alkane halogenation because the number of reactants and product molecules are equal. In this case, the ΔG is governed only by the enthalpy component. The most crucial factor that determines ΔH is the strength of the bonds. ΔH can be determined by comparing the energy...
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Related Experiment Video

Updated: Feb 24, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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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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Large Thermal Motion in Halide Perovskites.

T A Tyson1, W Gao2, Y-S Chen3

  • 1Department of Physics, New Jersey Institute of Technology, Newark, NJ, 07102, USA. tyson@njit.edu.

Scientific Reports
|August 26, 2017
PubMed
Summary
This summary is machine-generated.

Hybrid perovskite solar cells exhibit high efficiency and simple processing. This study reveals that the soft atomic structure of methylammonium lead iodide (CH₃NH₃PbI₃) enables high carrier mobility and structural instability, crucial for solar cell performance.

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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Last Updated: Feb 24, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Renewable Energy

Background:

  • Hybrid perovskites, particularly methylammonium lead iodide (CH₃NH₃PbI₃), are promising for high-efficiency solar cells.
  • Understanding their atomic-level properties is key to optimizing performance and stability.

Purpose of the Study:

  • To investigate the atomic structure and dynamics of CH₃NH₃PbI₃ single crystals.
  • To elucidate the relationship between atomic flexibility and material properties like carrier mobility and structural instability.

Main Methods:

  • Temperature-dependent structural measurements.
  • Molecular dynamics simulations.
  • Analysis of atomic displacement parameters (ADPs) and pair distribution functions.

Main Results:

  • A persistent tetragonal structure was observed with smooth changes in ADPs around the transition temperature (T*).
  • Iodine ions exhibit large atomic displacement, leading to flat potential wells and significant thermal expansion.
  • Simulations revealed asymmetric Pb-I pair distribution functions and enhanced iodine atom motion.

Conclusions:

  • The inherent flexibility and softness of the CH₃NH₃PbI₃ atomic structure are critical.
  • This flexibility facilitates localized atomic relaxation around defects, contributing to high carrier mobility.
  • It also explains the observed structural instability, a key factor in device performance and degradation.