As demand for low-cost, printable photovoltaics grows, nonfused ring electron acceptors (NFREAs) are attractive because they skip lengthy ring-closure steps, but their film-thickness tolerance and fill factors still lag behind fused-ring counterparts. Now, researchers from Beijing Normal University and Qingdao University, led by Prof. Zhishan Bo, Prof. Cuihong Li, Prof. Yahui Liu and Prof. Hao Lu, present an asymmetric side-group strategy that delivers a record FF of 80.1 % and maintains >14 % efficiency even at 300 nm active-layer thickness—setting new performance benchmarks for thick-film NFREA devices.
Why TT-Ph-C6 Matters
Innovative Design & Features
Applications & Future Outlook
This molecular design strategy offers a cost-effective pathway to high-efficiency, thick-film organic solar cells and underscores the importance of side-chain engineering in next-generation photovoltaics. Stay tuned for more breakthroughs from Prof. Bo, Prof. Li, Prof. Liu and Prof. Lu’s groups!
Nano-Micro Letters
News article
Asymmetric Side‑Group Engineering of Nonfused Ring Electron Acceptors for High‑Efficiency Thick‑Film Organic Solar Cells
10-Nov-2025