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Multi-interactions Regulate Perovskite Crystallization and Defect Passivation for Efficient and Stable Perovskite
Xiaolong Ren1, Guichun Yang1, Tiantian Lou1
1School of Materials Science and Engineering, Institute of New Energy Material Chemistry, Renewable Energy Conversion and Storage Center, Nankai University, Tianjin 300350, P. R. China.
Nano Letters
|January 24, 2026
Summary
A novel additive, sodium hydroxymethanesulfonate (SHMS), enhances perovskite solar cell (PSC) performance by controlling precursor chemistry and film formation. This leads to highly efficient and stable PSCs with improved power conversion efficiency.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- High-quality perovskite films are crucial for efficient and stable perovskite solar cells (PSCs).
- Simultaneously controlling precursor chemistry, crystallization, and defect passivation in perovskite films is challenging.
- Existing strategies often struggle to address these coupled factors effectively.
Purpose of the Study:
- To introduce a multifunctional additive, sodium hydroxymethanesulfonate (SHMS), for simultaneous regulation of perovskite precursor and film properties.
- To investigate the mechanism of SHMS in suppressing side reactions and inhibiting triiodide formation in the precursor.
- To evaluate the impact of SHMS on crystallization kinetics, defect passivation, and overall performance of perovskite solar cells.
Main Methods:
- SHMS was incorporated as an additive into the perovskite precursor solution.
- The additive's effect on precursor chemistry, including cation side reactions and triiodide formation, was analyzed.
- The crystallization kinetics and defect passivation in the resulting perovskite films were studied.
- Inverted perovskite solar cells (PSCs) and solar-charged supercapacitors were fabricated and characterized.
Main Results:
- SHMS effectively suppressed cation side reactions and triiodide formation in the precursor.
- The additive modulated crystallization kinetics via coordination with PbI2 and passivated defects in the film.
- Inverted PSCs with SHMS achieved a power conversion efficiency of 26.10% (certified 25.66%) and a high fill factor of 87%.
- The devices exhibited excellent thermal, moisture, and light stability.
- Integrated solar-charged supercapacitors showed an overall energy conversion efficiency of 11.84% with superior cycling stability.
Conclusions:
- Sodium hydroxymethanesulfonate (SHMS) acts as a multifunctional additive, enabling effective precursor-to-film regulation in perovskite solar cells.
- SHMS significantly enhances PSC efficiency, stability, and fill factor by improving film quality and passivating defects.
- The developed strategy offers a promising pathway for advancing high-performance and durable perovskite solar cell technology and energy storage applications.
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