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Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...

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Updated: Aug 9, 2025

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

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Published on: March 19, 2017

Functional Ionic Liquid Polymer Stabilizer for High-Performance Perovskite Photovoltaics.

Yunxiu Shen¹, Guiying Xu¹, Jiajia Li²

¹Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.

Angewandte Chemie (International Ed. in English)

|February 22, 2023

Summary

Researchers developed a novel ionic-liquid polymer to stabilize perovskite solar cells. This polymer enhances ink stability, film integrity, and device longevity, achieving high power conversion efficiencies and long-term operational stability.

Keywords:

Ionic Liquid Perovskite Polymer Precursor Ink Solar Cells

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Published on: February 27, 2017

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Last Updated: Aug 9, 2025

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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Published on: February 27, 2017

Area of Science:

Materials Science
Chemical Engineering
Renewable Energy

Background:

Perovskite solar cells (PSCs) face significant stability challenges impacting their commercial viability.
Underlying issues in precursor inks, films, device architecture, and their interdependence are not fully understood.

Purpose of the Study:

To design and synthesize a novel ionic-liquid polymer, poly[Se-MI][BF4], for comprehensive stabilization of PSC fabrication and operation.
To investigate the stabilizing mechanisms of the polymer's functional moieties on perovskite precursor inks and films.

Main Methods:

Synthesis of poly[Se-MI][BF4] incorporating carbonyl (C=O), selenium (Se+), and tetrafluoroborate (BF4-) ions.
Characterization of the polymer's coordination with lead and iodine ions in precursor inks.
Evaluation of defect passivation and ion migration suppression in perovskite films.
Fabrication and performance testing of small-area devices and large-area modules.

Main Results:

The polymer stabilized perovskite precursor inks for over two months.
Se+ and BF4- moieties effectively passivated grain boundaries and suppressed ion migration in perovskite films.
A 0.062-cm2 device achieved 25.10% power conversion efficiency, and a 15.39-cm2 module reached 20.85%.
Devices maintained over 90% of their initial efficiency after 2200 hours of continuous operation.

Conclusions:

The developed ionic-liquid polymer offers a robust solution for enhancing the stability of perovskite solar cells.
Synergistic effects of the polymer's functional groups lead to improved ink, film, and device stability.
The findings pave the way for scalable and durable perovskite solar technology.