Small-Molecule Electron Acceptors for Efficient Non-fullerene Organic Solar Cells
Zhenzhen Zhang1, Jun Yuan1, Qingya Wei1
1College of Chemistry and Chemical Engineering, Central South University, Changsha, China.
Non-fullerene electron acceptors are revolutionizing organic solar cells with improved optoelectronic properties and stability. This review highlights advancements in perylene diimide and fused-ring acceptors for high-performance devices.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Organic solar cells (OSCs) require efficient electron acceptor materials.
- Fullerene acceptors face limitations in tunability and stability.
- Non-fullerene acceptors (NFAs) offer superior optoelectronic properties and cost-effectiveness.
Purpose of the Study:
- To review recent advancements in non-fullerene electron acceptors for organic solar cells.
- To discuss the impact of structural modifications on acceptor properties.
- To highlight promising NFA classes for future OSC development.
Main Methods:
- Review of scientific literature on non-fullerene electron acceptors.
- Analysis of structure-property relationships in small-molecule acceptors.
- Focus on perylene diimide-based and A-D-A fused-ring acceptors.
Main Results:
- NFAs have enabled power conversion efficiencies exceeding 14% for single-junction and 15% for tandem OSCs.
- Structural modifications significantly influence absorption spectra, energy levels, and aggregation behavior.
- Perylene diimide and A-D-A fused-ring acceptors show great promise.
Conclusions:
- Non-fullerene electron acceptors are crucial for high-performance organic solar cells.
- Tailoring molecular structures is key to optimizing NFA performance.
- Continued development of NFAs promises a bright future for OSC technology.
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