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Related Concept Videos

Enthalpy of Solution02:39

Enthalpy of Solution

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There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
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Solution Formation02:16

Solution Formation

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There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
This selective...
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General Properties of Solutions02:12

General Properties of Solutions

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Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed. 
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Ideal Solutions02:24

Ideal Solutions

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According to Raoult’s law, the partial vapor pressure of a solvent in a solution is equal or identical to the vapor pressure of the pure solvent multiplied by its mole fraction in the solution. However, Raoult's Law is only valid for ideal solutions. For a solution to be ideal, the solvent-solute interaction must be just as strong as a solvent-solvent or solute-solute interaction. This suggests that both the solute and the solvent would use the same amount of energy to escape to the...
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Solution Equilibrium and Saturation01:59

Solution Equilibrium and Saturation

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Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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Solution Concentration and Dilution02:59

Solution Concentration and Dilution

133.8K
The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous...
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Related Experiment Video

Updated: Feb 2, 2026

Flash Infrared Annealing for Perovskite Solar Cell Processing
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High-Efficiency Spray-Coated Perovskite Solar Cells Utilizing Vacuum-Assisted Solution Processing.

James E Bishop1, Joel A Smith1, Claire Greenland1

  • 1Department of Physics & Astronomy , University of Sheffield , Hicks Building, Hounsfield Road , Sheffield S3 7RH , United Kingdom.

ACS Applied Materials & Interfaces
|November 10, 2018
PubMed
Summary
This summary is machine-generated.

We developed a vacuum-assisted ultrasonic spray-coating method for cesium-containing triple-cation perovskite solar cells, achieving 17.8% efficiency. This technique improves film crystallization for stable, high-performance solar cells.

Keywords:
low hysteresisperovskite solar cellthin filmtriple-cation perovskiteultrasonic spray-coating

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Perovskite solar cells offer high power-conversion efficiencies.
  • Scalable manufacturing of high-performance perovskite solar cells remains a challenge.
  • Cesium-containing triple-cation perovskites are promising for solar cell applications.

Purpose of the Study:

  • To develop a scalable fabrication method for cesium-containing triple-cation perovskite solar cells.
  • To investigate the effect of low vacuum exposure on film crystallization and morphology.
  • To enhance the power-conversion efficiency and stability of perovskite solar cells.

Main Methods:

  • Ultrasonic spray-coating was employed to deposit cesium-containing triple-cation perovskite films.
  • A brief low-vacuum exposure step was introduced to control film crystallization.
  • Film morphology and crystal structure were analyzed using microscopy and diffraction techniques.

Main Results:

  • Power-conversion efficiency of up to 17.8% was achieved.
  • Low vacuum exposure resulted in smooth, homogeneous films with densely packed perovskite crystals.
  • Non-vacuum-exposed films exhibited rougher morphology and inhomogeneity.

Conclusions:

  • The developed vacuum-assisted spray-coating technique is a promising step towards scalable manufacturing.
  • Controlling film crystallization via low vacuum exposure enhances perovskite solar cell performance.
  • This method contributes to the development of stable and high-performance perovskite solar cells.