Abstract Non-fullerene acceptors are proving to be effective for high efficiency polymer bulk heterojunction solar cells. We report the synthesis and properties of a three-dimensional naphthalene diimide-based acceptor where four dithienylnaphthalene moieties are attached to a central tetraphenylethylene unit. In spite of the material being designed as an electron acceptor it was found to have similar and good hole and electron mobilities of 1.5 × 10−4 and 1.8 × 10−4 cm2/Vs, respectively. When blended with PTB7-Th, which had previously been used with other three-dimensional acceptors, at a weight ratio of 1:1 the hole mobility was found to increase slightly but the electron mobility decreased such that there was an imbalance of two orders of magnitude. The blend with a 1:1 donor:acceptor weight ratio was found to give devices with the best power conversion efficiency of 3.0 % in an inverted device architecture, which is amongst the best for non-polymeric naphthalene diimide acceptors. A combination of transient absorption and intensity dependent measurements, along with the charge mobility results indicated that while exciton separation was rapid, the performance of the devices was limited by recombination processes that decreased the extraction of the photogenerated charges.

中文翻译：

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一种用于聚合物本体异质结太阳能电池的三维多发色团萘二亚胺受体

摘要 非富勒烯受体被证明对高效聚合物本体异质结太阳能电池是有效的。我们报告了基于三维萘二亚胺受体的合成和性质，其中四个二噻吩基萘部分连接到中心四苯基乙烯单元。尽管该材料被设计为电子受体，但发现其具有相似且良好的空穴和电子迁移率，分别为 1.5 × 10-4 和 1.8 × 10-4 cm2/Vs。当与以前与其他三维受体一起使用的 PTB7-Th 混合时，在 1:1 的重量比下，发现空穴迁移率略有增加，但电子迁移率下降，从而出现两个数量级的不平衡震级。与 1:1 供体的混合：发现受体重量比在倒置器件架构中提供具有 3.0% 最佳功率转换效率的器件，这是非聚合萘二酰亚胺受体的最佳器件之一。瞬态吸收和强度相关测量的组合以及电荷迁移率结果表明，虽然激子分离很快，但器件的性能受到复合过程的限制，复合过程减少了光生电荷的提取。