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Polymerization Strategies to Construct a 3D Polymer Passivation Network toward High Performance Perovskite Solar
Dachang Liu1,2,3, Xiao Wang1,2, Xianzhao Wang1,2,3
1Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, P. R. China.
Angewandte Chemie (International Ed. in English)
|March 2, 2023
Summary
This study enhances perovskite solar cells by reducing defects using 3D passivation frameworks. This improves carrier diffusion and boosts power conversion efficiency beyond 24% for devices and 21% for modules.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Uncoordinated Pb2+ defects in perovskite films cause n-type behavior, reducing carrier diffusion length and increasing recombination losses.
- These defects limit the efficiency and stability of perovskite solar cells.
Purpose of the Study:
- To develop a passivation strategy for reducing defects in perovskite films.
- To improve carrier diffusion length and energy level alignment.
- To enhance the power conversion efficiency of perovskite solar cells.
Main Methods:
- Utilized different polymerization strategies to create 3D passivation frameworks within the perovskite layer.
- Investigated the coordination bonding (C≡N⋅⋅⋅Pb) and passivation structure.
- Analyzed the impact of passivation on defect state density, carrier diffusion length, and iodine vacancies.
Main Results:
- Successfully reduced defect state density and significantly increased carrier diffusion length.
- Shifted the Fermi level from strong n-type to weak n-type by reducing iodine vacancies.
- Achieved a certified power conversion efficiency of 24.16% for the optimized device and 21.55% for the module.
Conclusions:
- The 3D passivation framework effectively mitigates defects in perovskite films.
- Improved energy level alignment and carrier injection efficiency lead to higher device performance.
- This approach offers a promising route for developing highly efficient and stable perovskite solar cells.
