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Pyridine-assisted solvent engineering for high-quality narrow-bandgap perovskites in efficient tandem modules
Jinglin Sun1, Qiushi Tian2, Chao Yu1
1School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Nature Communications
|October 9, 2025
Summary
Researchers developed a new method for creating high-quality, large-area perovskite films for tandem solar cells. This solvent engineering approach improves uniformity and efficiency for next-generation photovoltaic modules.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- All-perovskite tandem photovoltaic modules offer enhanced power conversion efficiency.
- A key challenge is producing high-quality, large-area tin-lead mixed narrow-bandgap (NBG) perovskite films.
Purpose of the Study:
- To develop a method for preparing large-area, compact, and uniform NBG perovskite films.
- To improve the performance of all-perovskite tandem photovoltaic modules through solvent engineering.
Main Methods:
- Modulating the crystallization process via solvent engineering, introducing pyridine into the solvent system.
- Utilizing pyridine's strong donor coordinating ability and high saturated vapor pressure.
- Employing a vacuum annealing method in conjunction with the solvent engineering strategy.
Main Results:
- Achieved large-area, compact, and uniform NBG perovskite films.
- Demonstrated all-perovskite tandem photovoltaic mini-modules with an average efficiency of 22.0% ± 0.4% over a 10.4 cm² aperture area.
- Pyridine's properties facilitated intermediate phase formation and reduced solvent residue.
Conclusions:
- The developed solvent engineering method is effective for producing high-quality NBG perovskite films.
- The strategy shows significant potential for the commercialization of all-perovskite tandem photovoltaic modules.
- This advancement contributes to the development of more efficient solar energy technologies.
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