Three different truxene-bridged perylenediimide (PDI) trimers are designed and synthesized. The truxene core and the PDI unit are linked by a triple bond (T-PDI), carbon-carbon single bond (S-PDI) and ring-fused linker (R-PDI). The effects of three linkage modes on the photophysical, electrochemical and photovoltaic properties of the acceptors are systematically investigated. Bulk heterojunction solar cells by using the truxene-bridged PDI trimers as electron acceptor and a commercial material (PTB7-Th) as electron donor were fabricated. The results demonstrate that the linkage mode between truxene and PDI units plays an important role in determining photovoltaic performances of non-fullerene electron acceptors. The R-PDI acceptor with ring-fused linker shows the highest power conversion efficiency (PCE) of 4.19% owning to its appropriate morphology, high charge mobility, and high open-circuit voltage (V_oc) of 1.0 V.

设计并合成了三种不同的戊二烯桥联的ylene二酰亚胺（PDI）三聚体。戊二烯核和PDI单元通过三键（T-PDI），碳-碳单键（S-PDI）和环稠合接头（R-PDI）连接。系统地研究了三种键合模式对受体的光物理，电化学和光伏性质的影响。以戊二烯桥PDI三聚体为电子受体，以市售材料（PTB7-Th）为电子供体，制备了块状异质结太阳能电池。结果表明，戊二烯和PDI单元之​​间的连接方式在决定非富勒烯电子受体的光伏性能中起着重要作用。这具有环稠合接头的R-PDI受体具有4.19％的最高功率转换效率（PCE），这归因于其适当的形态，高电荷迁移率和1.0 V的高开路电压（V _oc）。