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Synergistic Effect of Precursor and Interface Engineering Enables High Efficiencies in FAPbI3 Perovskite Solar Cells
Sylvester Sahayaraj1,2, Zbigniew Starowicz1, Marcin Ziółek3
1Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta St., 30-059 Krakow, Poland.
Materials (Basel, Switzerland)
|August 12, 2023
Summary
Post-treatment with octyl ammonium iodide (OAI) stabilizes formamidinium lead iodide (FAPbI3) perovskite solar cells, preventing phase transitions. This method enhances power conversion efficiencies to 22% by forming a protective 2D perovskite layer.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Physics
Background:
- Formamidinium lead iodide (FAPbI3) perovskite solar cells offer excellent opto-electronic properties and high power conversion efficiencies (PCEs).
- A major challenge is the instability of FAPbI3 due to phase transitions at room temperature, leading to device degradation.
- This instability limits the operational lifetime and commercial viability of FAPbI3-based solar cells.
Purpose of the Study:
- To enhance the operational stability of FAPbI3 perovskite solar cells.
- To investigate the use of octyl ammonium iodide (OAI) as a post-treatment agent for FAPbI3 stabilization.
- To optimize the OAI treatment and precursor stoichiometry for improved device performance.
Main Methods:
- Post-treatment of FAPbI3 surfaces with varying concentrations of octyl ammonium iodide (OAI).
- Optimization of precursor stoichiometry for the formation of a 2D perovskite layer.
- Fabrication of perovskite solar cells on a glass substrate.
- Characterization using physical and detailed optical analysis to verify the 2D layer formation.
Main Results:
- Successful stabilization of the FAPbI3 active phase and crystal structure using OAI post-treatment.
- Formation of a 2D perovskite layer at the interface, dependent on OAI concentration and precursor stoichiometry.
- Achieved a synergistic effect leading to improved power conversion efficiencies, with a best value of 22%.
- Verified the presence of the 2D perovskite layer on the 3D FAPbI3 surface.
Conclusions:
- Octyl ammonium iodide post-treatment is an effective strategy to stabilize FAPbI3 perovskite solar cells against phase transitions.
- Optimized OAI treatment and precursor stoichiometry can significantly enhance PCEs by forming a beneficial 2D perovskite interface layer.
- This approach offers a promising pathway for developing more stable and efficient perovskite solar cell technologies.
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