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Related Concept Videos

Precipitation Processes01:12

Precipitation Processes

518
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
518
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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Related Experiment Video

Updated: Aug 11, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
08:12

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Published on: September 8, 2017

9.6K

Solution evaporation processed high quality perovskite films.

Aqiang Liu1, Kang Liu2, Huimin Zhou2

  • 1School of Physics and Electronics, and Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of the Ministry of Education, Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China.

Science Bulletin
|February 8, 2023
PubMed
Summary

Researchers developed a simple solution evaporation method to create high-quality perovskite films for solar cells. This technique enhances power conversion efficiency (PCE) by 30% without toxic solvents or nitrogen atmospheres.

Keywords:
High-quality filmsPerovskitePower conversion efficiencySolution evaporation

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Organic-inorganic hybrid perovskite solar cells (PSCs) are promising photovoltaic devices due to high power conversion efficiency (PCE) and low cost.
  • High-quality perovskite crystals are crucial for efficient light absorption and charge transfer in PSCs.
  • Conventional perovskite film preparation often involves harsh conditions like nitrogen atmospheres and toxic anti-solvents, limiting practical application.

Purpose of the Study:

  • To develop a novel, simple, and practical method for preparing high-quality perovskite films.
  • To improve the power conversion efficiency (PCE) of perovskite solar cells (PSCs).
  • To circumvent the need for toxic anti-solvents and controlled atmospheres in perovskite film fabrication.

Main Methods:

  • A solution evaporation process was employed to form porous lead iodide (PbI2) films.
  • Porous PbI2 films were subsequently immersed in a methylammonium iodide (MAI) solution.
  • This process facilitated the transformation of PbI2 into well-distributed, large-grain perovskite films.

Main Results:

  • The novel method successfully produced high-quality perovskite films with well-distributed large grains.
  • The resulting perovskite solar cells exhibited a 30% enhancement in power conversion efficiency (PCE) compared to those made with standard sequential deposition.
  • The method avoids the use of toxic anti-solvents and nitrogen atmospheres.

Conclusions:

  • The solution evaporation followed by MAI immersion is a convenient and practical approach for fabricating high-quality perovskite films.
  • This method offers a pathway to more efficient and scalable perovskite solar cell production.
  • The enhanced PCE demonstrates the effectiveness of this simplified fabrication technique.