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Related Concept Videos

Shearing Strain01:20

Shearing Strain

1.6K
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
1.6K
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

651
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
651
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

557
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
557
Thermal Strain01:19

Thermal Strain

3.0K
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...
3.0K
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

9.2K
The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
9.2K
Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

649
Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...
649

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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Compressive Strain Induced With Lattice-Matching Molecule for Efficient and Stable Perovskite Solar Cells.

Guohui Yang1, Junshuai Zhang1, Bingying Sun2

  • 1School of Material Science and Engineering, University of Jinan, Jinan, P. R. China.

Chemsuschem
|March 1, 2026
PubMed
Summary

Strain engineering using [3,4-bipyridine]-6-carboxylic acid (BPC) successfully converted harmful tensile strain to compressive strain in perovskite solar cells (PSCs). This BPC modification improved film quality, carrier dynamics, and stability, leading to high efficiency.

Keywords:
efficiencylattice‐matching chelationperovskite solar cellsstabilitystress regulation

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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
  • Photovoltaics
  • Solid-State Chemistry

Background:

  • Tensile strain on perovskite film surfaces negatively impacts the performance and stability of perovskite solar cells (PSCs).
  • Effective strategies are needed to mitigate strain and enhance device longevity.

Purpose of the Study:

  • To engineer the strain in wide-bandgap perovskite films using a lattice-matching chelation strategy.
  • To improve the photovoltaic performance and operational stability of Cs$_{0.05}$FA$_{0.8}$MA0.15Pb(I0.77Br0.23)3 perovskite solar cells.

Main Methods:

  • Utilized [3,4-bipyridine]-6-carboxylic acid (BPC), a multidentate molecule, for strain engineering via lattice-matching chelation.
  • Applied BPC to Cs$_{0.05}$FA0.8}$MA0.15Pb(I0.77Br0.23)3 perovskite films to transform tensile strain into compressive strain.

Main Results:

  • Achieved high-quality perovskite films with reduced defect density and suppressed phase segregation.
  • Optimized carrier dynamics and energy level alignment within the PSCs.
  • The BPC-modified champion device reached a power conversion efficiency of 21.82%.

Conclusions:

  • Lattice-matching chelation with BPC is an effective method for strain engineering in perovskite films.
  • BPC modification enhances both the efficiency and stability of perovskite solar cells.
  • This approach offers a promising route for developing robust and high-performance PSCs.