Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
Perylene diimide (PDI) is a kind of important non-fullerene electron acceptors in the field of organic solar cells.[1] Previous molecular design of PDI-based acceptors has been directed to those with highly twisted geometries to suppress the excessive aggregation tendency of the PDI units. However, the disrupted molecular packing of these PDI-based acceptors may lead to inferior electron mobilities in the blend films. Here, we studied a series of ring-fused PDI-based acceptors that exhibited more rigidified molecular skeletons, higher absorptivity, upshifted energy levels and enhanced electron mobilities compared with their non-fused counterparts.[2] Importantly, extensive morphological characterizations revealed that after ring-fusion the PDI-based acceptors can obtain better molecular packing and higher domain purities, accounting for the high FFs of the devices of up to 70%.[3] In combination with donor polymer match and morphology control, high PCEs of up to 11% with small voltage losses of c.a. 0.5 V were achieved by the ring-fused PDI-based acceptors. Our work highlights the significance of the ring-fusion strategy in the design of novel PDI-based non-fullerene acceptors.
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