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Published on: March 19, 2017
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Enhancing perovskite solar cells efficiency through cesium fluoride mediated surface lead iodide modulation
Junming Chen1, Kun Xu2, Weicheng Xie2
1College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu, Anhui 233000, PR China; Anhui Province Quartz Sand Purification and Photovoltaic Glass Engineering Research Center, Chuzhou 233100, PR China.
Journal of Colloid and Interface Science
|September 6, 2023
Summary
Cesium fluoride (CsF) polishing effectively stabilizes perovskite solar cells (PSCs) by reducing excess lead iodide. This CsF post-treatment enhances device efficiency and significantly improves long-term operational stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Excessive lead iodide (PbI2) on perovskite surfaces degrades perovskite solar cell (PSC) stability under illumination.
- This instability limits the commercial viability of PSC technology.
Purpose of the Study:
- To investigate the efficacy of cesium fluoride (CsF) post-treatment for passivating PbI2 on perovskite films.
- To evaluate the impact of CsF treatment on perovskite film properties and photovoltaic performance.
Main Methods:
- CsF post-treatment applied to perovskite films.
- Time-resolved photoluminescence (TRPL) spectroscopy to assess carrier dynamics.
- Ultraviolet photoelectron spectroscopy (UPS) to analyze electronic band structure.
- Fabrication and characterization of PSCs with and without CsF treatment.
Main Results:
- CsF treatment significantly reduced PbI2 on the perovskite surface.
- Passivation enhanced carrier interface transport by reducing valence band offset.
- CsF-treated PSCs achieved a peak power conversion efficiency (PCE) of 24.25% and fill factor (FF) of 81.72%, compared to 22.12% and 77.40% for untreated devices.
- CsF-treated PSCs retained 91% of their initial PCE after 2500 hours of aging, while untreated devices retained only 42%.
Conclusions:
- CsF post-treatment is an effective strategy for stabilizing perovskite solar cells.
- This method enhances both the efficiency and long-term operational stability of PSCs.
- The findings suggest a promising pathway for developing durable and high-performance perovskite solar cells.
