In this report, two novel small molecules (SMs) with a D(A-Ar)₂ type molecular backbone based on a large planar carbazole (CZ) fused-ring central core (TBTDBC), grafting an electron-withdrawing diketopyrrolopyrrole (DPP) as bridged acceptor moieties and appending with or without a CZ as end-capping units, namely TBTDBC(DPP)₂ and TBTDBC(DPPCZ)₂, are rationally synthesized and characterized by ¹H NMR, MS, elemental, electrochemical and photophysical analysis. The influences of the optoelectronic, carrier mobilities, morphological properties, and likewise photovoltaic performances of the both materials were systematically investigated. The TBTDBC(DPPCZ)₂ presented higher hole mobility and better crystallinity than the TBTDBC(DPP)₂ analogs. After optimized, a power conversion efficiency (PCE) of 3.11%% is obtained for the device based on TBTDBC(DPP)₂/PCB₇₁M, and a higher 3.47% achieved by the TBTDBC(DPPCZ)₂/PCB₇₁M-based device. These results indicate that an efficient strategy via inserting a large fused ring central core and grafting a suitable terminal unit can enhance the photovoltaic performance of the corresponding organic solar cells (OSCs).

在此报告中，两个具有大平面咔唑（CZ）稠环中心核（TBTDBC）的具有D（A-Ar）₂型分子骨架的新型小分子（SMs），接枝了吸电子二酮吡咯并吡咯（DPP）通过¹ H NMR，MS，元素，电化学和光物理分析，合理地合成并表征了作为桥联的受体部分并带有或不带有CZ作为封端单元的TBTDBC（DPP）₂和TBTDBC（DPPCZ）₂。系统地研究了两种材料的光电，载流子迁移率，形态学性质以及同样的光伏性能的影响。TBTDBC（DPPCZ）₂与TBTDBC（DPP）₂类似物相比，具有更高的空穴迁移率和更好的结晶度。经过优化后，基于TBTDBC（DPP）₂ / PCB ₇₁ M的器件的功率转换效率（PCE）为3.11 %%，而基于TBTDBC（DPPCZ）₂ / PCB ₇₁ M的器件则实现了3.47％的更高的功率转换效率。设备。这些结果表明，通过插入大的稠环中心核并接枝合适的末端单元的有效策略可以增强相应有机太阳能电池（OSC）的光伏性能。