Hidden Structure Ordering Along Backbone of Fused-Ring Electron Acceptors Enhanced by Ternary Bulk Heterojunction
Hidden Structure Ordering Along Backbone of Fused-Ring Electron Acceptors Enhanced by Ternary Bulk Heterojunction
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DOI：
10.1002/adma.201802888
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发表时间：
2018-08-23
影响因子：
29.4
通讯作者：
Lu, Xinhui
中科院分区：
文献类型：
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作者：
Mai, Jiangquan;Xiao, Yiqun;Lu, Xinhui
融合环电子受体（FREAs）作为一类非富勒烯（NF）受体，在推动有机太阳能电池的功率转换效率方面取得了巨大的成功。本文报道了两种广泛研究的FREAsITIC和tic - th的详细分子包装基序。首次揭示了由有利端基叠加引起的沿主干方向的长程结构有序。通过ITIC和ITIC- th的相互混合，可以显著增强三元膜中主链的有序性，从而提高了平面内电子迁移率，提高了三元器件的性能。骨架有序可能是frea的一个共同形态学特征，为先前观察到的frea器件的小开路电压损失和优越性能提供了解释，并指导了未来高性能NF受体的分子设计。
Fused-ring electron acceptors (FREAs), as a family of non-fullerene (NF) acceptors, have achieved tremendous success in pushing the power conversion efficiency of organic solar cells. Here, the detailed molecular packing motifs of two extensively studied FREAsITIC and ITIC-Th are reported. It is revealed for the first time the long-range structure ordering along the backbone direction originated from favored end group - stacking. The backbone ordering could be significantly enhanced in the ternary film by the mutual mixing of ITIC and ITIC-Th, which gives rise to an improved in-plane electron mobility and better ternary device performance. The backbone ordering might be a common morphological feature of FREAs, providing explanations to previously observed small open circuit voltage loss and superior performance of FREA-based devices and guiding the future molecular design of high-performance NF acceptors.