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Suppressing Thermal Aggregation of Fullerene Enables ISOS-L-3 Stable Inverted Perovskite Solar Cells
Qiang Weng1, Yunfei Li1, Sheng Fu1
1School of Physics and Electronic Science Engineering Research Center of Nano-photonics and Advanced Instrument Ministry of Education, East China Normal University, Shanghai, China.
Advanced Materials (Deerfield Beach, Fla.)
|December 26, 2025
Summary
Researchers developed a "fullerene-fixed web" to prevent fullerene aggregation in perovskite solar cells (PSCs). This innovation enhances thermal stability and device longevity under harsh conditions, paving the way for commercialization.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Inverted perovskite solar cells (PSCs) show promise but degrade under commercial testing (ISOS-L-3).
- Fullerene aggregation at high temperatures causes irreversible interface destruction, hindering PSC commercialization.
- Developing strategies to enhance PSC photothermal durability is crucial.
Purpose of the Study:
- To create a stable interface in inverted PSCs by preventing fullerene aggregation.
- To improve the thermal stability and operational lifetime of perovskite solar cells.
- To achieve high efficiency and long-term durability in perovskite photovoltaics.
Main Methods:
- Constructed a "fullerene-fixed web" using in situ polymerized 3-aminopropyltrimethoxysilane (APTMS)-derived siloxane network.
- Immobilized [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) within a 3D siloxane framework via hydrogen bonding.
- Utilized exposed amino groups for perovskite surface defect passivation and enhanced interfacial coupling.
Main Results:
- The "fullerene-fixed web" effectively suppressed PCBM thermal aggregation.
- Achieved a champion inverted PSC efficiency of 26.39% (certified 26.27%).
- Devices retained over 90% of initial performance after 800 hours under ISOS-L-3 conditions, outperforming control devices (T90 < 250 h).
Conclusions:
- The bionic spider web-inspired approach provides a feasible pathway to highly efficient and photothermally durable PSCs.
- The APTMS-derived siloxane network successfully immobilizes PCBM, enhancing device stability.
- This method significantly overcomes the thermal degradation limitations of fullerene-based PSCs.
