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Diastereomeric Fullerene Composite Engineering for Enhanced Perovskite Solar Cells
Jianchang Wu1,2, Jiyun Zhang1,2, Luyao Wang3,4
1Forschungszentrum Jülich GmbH, Helmholtz-Institute Erlangen-Nürnberg (HI-ERN), 91058 Erlangen, Germany.
Journal of the American Chemical Society
|August 21, 2025
Summary
New fullerene derivatives enhance perovskite solar cell (PSC) efficiency and stability. This molecular engineering approach avoids extra passivation layers, improving device lifetime and performance.
Area of Science:
- Materials Science
- Renewable Energy
- Organic Electronics
Background:
- Perovskite solar cells (PSCs) require surface passivation for high performance and stability.
- Existing passivation agents can cause chemical and structural instabilities, limiting device longevity.
Purpose of the Study:
- To develop a molecular engineering strategy for enhancing PSC efficiency and stability.
- To investigate the use of chiral fullerene derivatives as electron transport layer (ETL) modifiers.
Main Methods:
- Synthesized chiral C60-Furan-Sugar (CFS) fullerene derivatives.
- Blended CFS derivatives with PCBM to modify the ETL in PSCs.
- Evaluated the optoelectronic properties and stability of the modified ETL and resulting PSCs.
Main Results:
- Incorporation of CFSs enhanced ETL electron mobility and dielectric constant.
- CFS derivatives effectively passivated perovskite surface defects.
- PSCs with PCBM:CFS-RS blends achieved 25.81% PCE and retained 95% performance after 1000h aging without additional passivation.
Conclusions:
- Molecular engineering of fullerene derivatives can simultaneously improve PSC efficiency and stability.
- Chiral fullerene derivatives offer a promising route to overcome limitations of traditional passivation methods.
- Tuning fullerene side chain substituents influences film optoelectronic properties for advanced solar cell applications.
