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Updated: Sep 3, 2025
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
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Inactive (PbI2)2RbCl stabilizes perovskite films for efficient solar cells
Yang Zhao1,2, Fei Ma1,2, Zihan Qu1,2
1Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, P.R. China, 100083.
Science (New York, N.Y.)
|July 28, 2022
Summary
RbCl doping converts excess lead iodide (PbI2) into a stable compound, enhancing perovskite solar cell efficiency and stability. This strategy achieves a 25.6% certified power conversion efficiency (PCE) with improved operational longevity.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Excess lead iodide (PbI2) in halide perovskite solar cells can improve power conversion efficiency (PCE) but negatively impacts device stability and causes hysteresis.
- Stabilizing the perovskite phase is crucial for reliable solar cell performance.
Purpose of the Study:
- To stabilize the perovskite phase in solar cells by converting excess PbI2 into an inactive compound.
- To improve the power conversion efficiency (PCE) and operational stability of formamidinium lead iodide (FAPbI3) perovskite solar cells.
Main Methods:
- Utilized Rubidium chloride (RbCl) doping to convert excess lead iodide (PbI2) into an inactive (PbI2)2RbCl compound.
- Fabricated and characterized formamidinium lead iodide (FAPbI3) perovskite solar cells using the developed doping strategy.
- Conducted shelf storage and thermal stability tests at 85°C to assess device longevity.
Main Results:
- Achieved a certified power conversion efficiency (PCE) of 25.6% for the FAPbI3 perovskite solar cells.
- Demonstrated significant device stabilization, with retained PCE values of 96% after 1000 hours of shelf storage.
- Showcased enhanced thermal stability, retaining 80% of original PCE after 500 hours at 85°C.
Conclusions:
- RbCl doping effectively stabilizes the perovskite phase by converting detrimental excess PbI2.
- This method significantly enhances both the power conversion efficiency (PCE) and long-term operational stability of FAPbI3 perovskite solar cells.
- The strategy offers a promising pathway for developing highly efficient and durable perovskite solar technologies.
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