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Updated: Jun 13, 2026
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
Complete DMA+/Cs+ Exchange and Rapid Phase Conversion via FAAC-Mediated Intermediate Phase Engineering for Efficient
Yao Fu1,2, Jia Xu1,2, Huifang Han1,2
1New Energy Generation National Engineering Research Center, North China Electric Power University, Beijing 102206, P. R. China.
The Journal of Physical Chemistry Letters
|June 12, 2026
Summary
Formamidinium acetate (FAAC) additive enhances all-inorganic perovskite crystallization for high-quality films. This leads to efficient and stable perovskite solar cells with a 21.84% power conversion efficiency.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Photovoltaics
Background:
- Crystallization kinetics are crucial for all-inorganic perovskite solar cell performance.
- Controlling intermediate phases like DMAPbI3 and Cs4PbI6 is key to achieving high-quality CsPbI3 films.
Purpose of the Study:
- To investigate the role of formamidinium acetate (FAAC) as a multifunctional additive.
- To improve the quality and stability of black-phase γ-CsPbI3 thin films for perovskite solar cells.
Main Methods:
- Utilized FAAC as an additive during the synthesis of CsPbI3 perovskite films.
- Analyzed the effects of FAAC on intermediate phase formation, cation exchange, and defect reduction.
- Fabricated and characterized perovskite solar cells (PSCs) using the optimized films.
Main Results:
- FAAC reduced the formation energy of the Cs4PbI6 intermediate, promoting its early formation.
- FAAC facilitated rapid cation exchange and accelerated DMAI removal, reducing residual DMA+ and defects.
- Optimized FAAC-based PSCs achieved a power conversion efficiency (PCE) of 21.84%.
Conclusions:
- FAAC is an effective additive for promoting high-quality γ-CsPbI3 film formation.
- The optimized PSCs demonstrate excellent operational stability, retaining 90% efficiency after 500 hours.
- FAAC-based perovskite solar cells show significant potential for commercial applications.
