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Functionalized Phenyl Methanaminium Salts Provide Highly Stable Perovskite Solar Cells
Mustafa Yaşa1,2, Esra Bag Celik1,2, Xiao-Xin Gao3
1ODTÜ-GÜNAM, Middle East Technical University, Ankara 06800, Türkiye.
ACS Applied Materials & Interfaces
|March 17, 2025
Summary
Functionalized phenyl methanaminium iodide salts improve perovskite solar cell performance. Thiophene-functionalized phenyl methanaminium iodide (TPMAI) passivated cells achieved 23.15% efficiency and enhanced stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) are promising for renewable energy.
- Surface and grain boundary passivation is crucial for PSC performance and stability.
- Large ammonium salts are effective passivating agents.
Purpose of the Study:
- To synthesize novel furan-, thiophene-, and selenophene-functionalized phenyl methanaminium iodide salts (FPMAI, TPMAI, SPMAI).
- To investigate their efficacy as passivating agents for 3D perovskite layers.
- To enhance the power conversion efficiency (PCE) and operational stability of PSCs.
Main Methods:
- Synthesis of FPMAI, TPMAI, and SPMAI.
- Application of these salts as passivating agents on 3D perovskite films.
- Fabrication and characterization of PSC devices.
- Performance testing under continuous illumination.
- Density Functional Theory (DFT) calculations to understand passivation mechanisms.
Main Results:
- TPMAI-passivated PSCs achieved a PCE of 23.15%, significantly higher than the reference (20.91%).
- TPMAI-treated PSCs retained 98% of their initial efficiency after 1250 hours of illumination, compared to 54% for the reference.
- DFT calculations indicated that TPMAI effectively passivates defects and suppresses iodine vacancy formation.
Conclusions:
- Functionalized phenyl methanaminium iodide salts, particularly TPMAI, are effective passivating agents for PSCs.
- TPMAI enhances both the efficiency and long-term stability of perovskite solar cells.
- This work demonstrates a viable strategy for developing high-performance and stable PSCs.
