Publication date: 6th November 2020
Over more than two decades of research, organic solar cells have achieved tremendous progresses in materials & device engineering and applications. For further advance, the power conversion efficiencies (PCEs) of organic solar cells need to be substantially improved.
Inspired by the recent success in non-fullerene electron acceptors (NFAs), we have developed a design strategy defined as “A-DA¢D-A” to obtain a series of high-performing NFAs, called as Y series. D = electron donor unit while A and A¢ = electron acceptor unit. The key to this molecular innovation is introducing an electron-deficient moiety (A¢) such as benzotriazole or benzothiadiazole into the central fused ring. Generally, these electron acceptors show extended absorption in the NIR region and provide considerably low energy losses in organic solar cells, hence having set new records for the certified power conversion efficiencies by National Renewable Energy Laboratory (NREL).
It is worth mentioned that our research on these newly designed electron acceptors has attracted extensive attention. For instance, the research paper on the Y6 acceptor (Joule, 2019, 3, 1140) was cited over 1000 times by the others within a very short time since its publication. More importantly, the certified power conversion efficiency of more than 17% has been reported by our fellow researchers based on the commercially available Y6. The underlying role of these acceptors has been actively investigated at home and abroad. While first achieving the 15% PCE in the single-junction solar cells, Y6 appears to be a universal electron acceptor and contributes to developing semi-transparent and flexible organic solar cells.
Keywords: Organic solar cells; Power conversion efficiency; Electron acceptor; Bulk heterojunction
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