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Efficient Organic Solar Cells from Molecular Orientation Control of M-Series Acceptors
Joule ( IF 39.8 ) Pub Date : 2020-12-04 , DOI: 10.1016/j.joule.2020.11.006
Yunlong Ma , Ming Zhang , Shuo Wan , Pan Yin , Pengsong Wang , Dongdong Cai , Feng Liu , Qingdong Zheng

A “face-on” molecular orientation is essential for photovoltaic materials with efficient vertical carrier transport, but understanding how the molecular structures control their orientations remains challenging. Based on a ladder-type fused-ring core without sp3-hybridized bridging atoms, novel acceptor-donor-acceptor (A-D-A or ADA)-type nonfullerene acceptors (M3 and M32) are developed, and their molecular orientation behaviors are successfully controlled by the neighboring side chains. With linear n-cetyl chains on the nitrogen atoms, the acceptor (M32) tends to adopt an “edge-on” molecular orientation, whereas with bulky branched 2-hexyldecyl chains, the acceptor (M3) has a preferred “face-on” orientation. Blended with a donor polymer of PM6, M3 shows optimal phase separation and dramatically improved electron transport, consequently leading to a much higher device performance than M32. Further optimization of the M3-based devices yields an outstanding efficiency of 16.66%. The strategy of molecular orientation control proposed here will inspire many other innovative designs and syntheses of high-performance nonfullerene acceptors.



中文翻译:

M系列受体分子取向控制的高效有机太阳能电池

“面对面”的分子取向对于具有有效垂直载流子传输的光伏材料至关重要,但是了解分子结构如何控制其取向仍然具有挑战性。基于不带sp 3的梯形稠环杂交桥原子,新型受体-供体-受体(ADA或ADA)型非富勒烯受体(M3和M32)的开发,并成功地控制了它们的分子取向行为由相邻的侧链。在氮原子上带有线性正十六烷基链的情况下,受体(M32)倾向于采用“边对边”的分子取向,而对于庞大的支链2-己基癸基链,受体(M3)具有较好的“面对”方向。与PM6的供体聚合物共混后,M3表现出最佳的相分离并显着改善了电子传输,因此比M32具有更高的器件性能。基于M3的设备的进一步优化产生了16.66%的出色效率。

更新日期:2021-01-20
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