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Lead(II) 2-Ethylhexanoate for Simultaneous Modulated Crystallization and Surface Shielding to Boost Perovskite Solar
Tengteng Yang1, Wangen Zhao1, Yan Yang1
1Key Laboratory for Applied Surface and Colloid Chemistry, National Ministry of Education, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, China.
Advanced Materials (Deerfield Beach, Fla.)
|February 17, 2023
Summary
Lead(II) 2-ethylhexanoate (LDE) enhances perovskite films for solar cells by improving crystallization and surface protection. This boosts power conversion efficiency to 24.84% and enhances device stability.
Area of Science:
- Materials Science
- Photovoltaics
- Nanotechnology
Background:
- Perovskite solar cells offer high efficiency but suffer from stability issues.
- Carrier transport and long-term stability are limited by bulk and surface properties of perovskite films.
Purpose of the Study:
- To improve the quality and stability of perovskite films for light-harvesting applications.
- To investigate the role of lead(II) 2-ethylhexanoate (LDE) in perovskite film formation and performance.
Main Methods:
- Introduction of lead(II) 2-ethylhexanoate (LDE) via an antisolvent process during perovskite film crystallization.
- Coordination of carboxyl functional groups with Pb cations to reduce defect density.
- Formation of a protective layer by long alkyl chains on the perovskite surface.
Main Results:
- Achieved a high-quality perovskite film with altered crystallization kinetics.
- Reduced defect density associated with unsaturated Pb atoms.
- Demonstrated a power conversion efficiency (PCE) of 24.84% in the assembled device.
- Significantly improved thermal and operational stability due to reduced ion-migration channels.
Conclusions:
- LDE effectively enhances perovskite film quality and stability.
- The surface protection offered by LDE's long alkyl chains mitigates degradation from water and air.
- Improved stability and high PCE make LDE a promising additive for perovskite solar cells.
