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Common Ion Effect03:24

Common Ion Effect

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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The goodness–of–fit test can be used to decide whether a population fits a given distribution, but it will not suffice to decide whether two populations follow the same unknown distribution. A different test, called the test for homogeneity, can be used to conclude whether two populations have the same distribution. To calculate the test statistic for a test for homogeneity, follow the same procedure as with the test of independence. The hypotheses for the test for homogeneity can...
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Tissue homogenization involves disintegrating tissue architecture and lysing cells, and is an early step in isolating and analyzing cellular components. The method used for homogenization depends on the sample type, the amount of sample available, the analyte to be obtained, and the sensitivity of the method. These methods are broadly classified as mechanical and non-mechanical methods.
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α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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The attack of a nucleophile at the β carbon of an α,β-unsaturated carbonyl compound is called conjugate addition. Conjugate addition reactions of active methylene compounds, such as β-diketones, β-keto esters, β-keto nitriles, and α-nitro ketones, are called Michael addition reactions.
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Updated: Feb 5, 2026

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Homogenized Optoelectronic Properties in Perovskites: Achieving High-Efficiency Solar Cells with Common Chloride

Junke Wang1, Shuaifeng Hu1, Xinyu Gu2

  • 1Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, U.K.

Journal of the American Chemical Society
|February 3, 2026
PubMed
Summary
This summary is machine-generated.

Combining methylammonium chloride (MACl) and lead chloride (PbCl2) additives enhances perovskite film quality for efficient solar cells. This strategy improves uniformity and stability, crucial for advancing perovskite photovoltaics.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Solid-State Chemistry

Background:

  • Perovskite solar cells require high-quality films for optimal performance.
  • Chloride additives like lead chloride (PbCl2) and methylammonium chloride (MACl) are used to control perovskite crystallization.
  • The specific effects of different chloride additive forms on film uniformity are not fully understood.

Purpose of the Study:

  • To investigate the impact of different chloride additives on perovskite film properties.
  • To understand how chloride additives influence phase transitions and carrier dynamics.
  • To develop a strategy for enhancing large-area perovskite solar cell performance and stability.

Main Methods:

  • Fabrication of perovskite films using varying combinations of MACl and PbCl2.
  • Characterization of film crystallinity, morphology, and optoelectronic properties.
  • Fabrication and testing of inverted (p-i-n) perovskite solar cells.

Main Results:

  • Strategic combination of MACl and PbCl2 improved crystallinity and optoelectronic uniformity.
  • Achieved certified efficiencies of 26.4% (0.05 cm2) and 24.5% (1 cm2) for inverted perovskite solar cells.
  • Devices retained 88% performance after 1200 hours of operation at 65 °C.

Conclusions:

  • Mechanistic differences between chloride additive forms were elucidated.
  • Combining MACl and PbCl2 offers a viable strategy for high-efficiency, stable, large-area perovskite photovoltaics.
  • The findings contribute to advancing thermally stable perovskite solar technology.