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Performance Promotion of Inverted FAxCs1-xPbI3 Solar Cells through Dual Molecular Passivation Strategy.
Xingyuan Zhong1,2,3,4, Handong Zhang1,2,3,4, Jia Wang1,2,3,4
1Institute of Photoelectronic Thin Film Devices and Technology, Nankai University, Tianjin 300350, China.
ACS Applied Materials & Interfaces
|November 18, 2025
Summary
This study introduces a dual molecular passivation strategy for perovskite solar cells (PSCs). It effectively reduces defects and suppresses 2D perovskite formation, enhancing device efficiency and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Perovskite solar cells (PSCs) face performance limitations due to high defect densities at the electron-transporting layer (ETL) interface.
- Current passivation methods using single cations can induce undesirable 2D perovskite phases, hindering charge transport.
Purpose of the Study:
- To develop an effective dual molecular passivation strategy for perovskite solar cells.
- To address limitations in carrier transport and extraction caused by interface defects and 2D phase formation.
Main Methods:
- Synergistic passivation using an optimized n-BABr/PEAI ratio to form a stable monolayer.
- Utilizing steric competition between passivators to inhibit 2D perovskite growth.
- Optimizing energy-level alignment between the perovskite and ETL.
Main Results:
- Reduced defect density from 1.027 × 10^16 cm^-3 to 4.073 × 10^15 cm^-3.
- Suppressed formation of 2D perovskite phases.
- Enhanced carrier extraction efficiency and improved device performance and operational stability.
Conclusions:
- The dual molecular passivation strategy effectively inhibits 2D perovskite phase growth.
- This approach offers a promising pathway for developing high-performance and stable perovskite solar cells.
