A–Ar–A-type small molecule (SM) of Py-2DTOBT and Py-2DTOBTPh with an Ar(A–D)2 framework were synthesized, in which 2,7-pyrene (Py) and alkoxyl-substituted benzothiadiazole (OBT) were, respectively, used as the central aryl (Ar) and arm acceptor (A), while 3-phenanthrene (Ph) was used as a terminal donor (D) in Py-2DTOBTPh. By comparison with the parent SM of Py-2DTBT, where 2,7-pyrene (Py) and benzothiadiazole (BT) were used as the central aryl (Ar) and arm acceptor (A), the effects of non-covalent interactions and the terminal group on optical, electrochemical, and photovoltaic properties were investigated. The gradually improved photovoltaic performances were observed among Py-2DTBT, Py-2DTOBT, and Py-2DTOBTPh based organic solar cells. A power conversion efficiency (PCE) of 2.83% was obtained in the Py-2DTOBTPh/PC71BM-based device, which is a 53% improvement related to that of Py-2DTOBT and three times enhanced related to that of Py-2DTBT(Py-2DTOBT:PCE of 1.86%, Py-2DTBT:PCE of 0.74%).

中文翻译：

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提高苯并噻二唑基小分子的光伏性能：非共价相互作用和芳基端基的协同作用

合成了具有Ar(A-D)2骨架的Py-2DTOBT和Py-2DTOBTPh的A-Ar-A型小分子(SM)，其中2,7-芘(Py)和烷氧基取代的苯并噻二唑(OBT) ) 分别用作中心芳基 (Ar) 和臂受体 (A)，而 3-菲 (Ph) 用作 Py-2DTOBTPh 中的末端供体 (D)。通过与 Py-2DTBT 的母体 SM 相比，其中 2,7-芘（Py）和苯并噻二唑（BT）用作中心芳基（Ar）和臂受体（A），非共价相互作用的影响和研究了端基对光学、电化学和光伏特性的影响。在基于 Py-2DTBT、Py-2DTOBT 和 Py-2DTOBTPh 的有机太阳能电池中观察到逐渐改善的光伏性能。在基于 Py-2DTOBTPh/PC71BM 的器件中获得了 2.83% 的功率转换效率 (PCE)，