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Dynamic Strain Regulation Via Photoresponsive Fullerenes Enables High-Performance and UV-Robust Perovskite Solar
Jianfei Yang1, Han Wang1, Yunxuan Xu1
1State Key Laboratory of New Ceramics Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, China.
Advanced Materials (Deerfield Beach, Fla.)
|July 23, 2026
Summary
Perovskite solar cells (PSCs) stability is improved using a photoresponsive molecule that adapts to UV light. This dynamic interface engineering enhances efficiency and durability, paving the way for robust perovskite optoelectronics.
Area of Science:
- Materials Science
- Photovoltaics
- Organic Chemistry
Background:
- Perovskite solar cells (PSCs) suffer from long-term instability due to degradation at the buried interface.
- Synergistic effects of tensile strain and UV irradiation accelerate PSC degradation.
Purpose of the Study:
- To develop a dynamic interface strategy for enhancing PSC stability and performance.
- To mitigate degradation caused by UV light and mechanical stress.
Main Methods:
- Introduction of a fullerene-based photoresponsive molecule, C60-azo, as an adaptive interlayer.
- Utilizing the trans-to-cis isomerization of C60-azo under UV illumination to generate compressive stress and passivate defects.
- Investigating the mechanochemical dual mechanism for interface stabilization.
Main Results:
- Modified n-i-p PSCs achieved a power conversion efficiency of 26.60%.
- Unencapsulated devices retained 92.7% efficiency after 488 h of UV exposure.
- Encapsulated cells maintained 94.7% efficiency after 1000 h of continuous illumination.
Conclusions:
- Dynamic photoresponsive interface engineering is a pioneering strategy for durable perovskite optoelectronics.
- C60-azo effectively mitigates UV-driven lattice distortion and chemical degradation.
