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Molecular Locking with All-Organic Surface Modifiers Enables Stable and Efficient Slot-Die-Coated
Prem Jyoti Singh Rana1, Benny Febriansyah1,2, Teck Ming Koh1
1Energy Research Institute at Nanyang Technological University (ERI@N), Research Techno Plaza, X-Frontier Block Level 5, 50 Nanyang Drive, Singapore, 637553, Singapore.
Advanced Materials (Deerfield Beach, Fla.)
|March 21, 2023
Summary
Researchers developed a hydrophobic organic salt to enhance perovskite solar cell stability. This surface modification improves power conversion efficiency and long-term durability for large-area slot-die-coated devices.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- State-of-the-art large-area slot-die-coated perovskite solar cells (PSCs) achieve over 19% power conversion efficiency (PCE).
- PSC stability remains a challenge due to intrinsic point defects and surface imperfections from fabrication.
Purpose of the Study:
- To improve the stability and performance of large-area slot-die-coated perovskite solar cells.
- To address intrinsic point defects and surface imperfections using a novel surface modification strategy.
Main Methods:
- Utilized a hydrophobic all-organic salt to modify the top surface of methylammonium (MA)-free halide perovskite layers.
- The organic salt acts as a molecular lock, binding to anion and cation vacancies to enhance intrinsic stability.
- Investigated the reduction of external species ingress (oxygen, moisture) and volatile organic component egress.
Main Results:
- Treated PSCs achieved 19.28% PCE (active area) and 17.62% PCE (aperture area) for mini-modules.
- Unencapsulated mini-modules retained approximately 80% efficiency after 7500 hours (313 days) of storage under 30% relative humidity.
- Mini-modules maintained over 90% of initial efficiency during continuous testing for over 850 hours.
Conclusions:
- The hydrophobic all-organic salt effectively enhances the intrinsic stability of perovskite layers.
- Surface modification significantly improves the operational stability and longevity of large-area slot-die-coated PSCs.
- This approach offers a promising pathway for developing durable and efficient perovskite solar technologies.
