A fluorinated BDT-TPD-based donor polymer (P1) was synthesized via Suzuki polymerization. P1 shows a wide bandgap (1.9 eV) and a deep highest occupied molecular orbital level (−5.71 eV). Ternary organic solar cells (OSCs) were fabricated from our synthesized polymer donor (P1) and two small molecular nonfullerene acceptors (IT-4F and Y6). The P1:IT-4F binary OSC exhibited a power conversion efficiency (PCE) of 6.59%, with a short-circuit current density (J_SC) of 10.36 mA/cm², open-circuit voltage (V_OC) of 0.91 V and a fill factor (FF) of 70%. By contrast, the P1:Y6 binary OSC exhibited a PCE of 10.58% with a J_SC of 22.01 mA/cm², V_OC of 0.86 V and FF of 56%. An enhanced PCE of 11.64% was achieved in the ternary OSC with 25 wt% IT-4F incorporated into the acceptors [IT-4F:Y6 (25:75)]; this enhancement was attributed to the improved J_SC of 22.97 mA/cm², V_OC of 0.87 V and FF of 58%. Appropriate phase separation could be achieved by incorporating an appropriate amount of IT-4F into the acceptors, which promoted exciton dissociation and charge transport. The PCE improvement of the IT-4F:Y6 (25:75) ternary device was attributed mainly to enhanced photon harvesting and exciton dissociation and to reduced charge recombination.

通过铃木聚合合成氟化的基于BDT-TPD的供体聚合物（P1）。P1显示宽带隙（1.9 eV）和最深的最高占据分子轨道能级（−5.71 eV）。三元有机太阳能电池（OSC）由我们的合成聚合物供体（P1）和两个小分子非富勒烯受体（IT-4F和Y6）制成。P1：IT-4F二元OSC的功率转换效率（PCE）为6.59％，短路电流密度（J _SC）为10.36 mA / cm ²，开路电压（V _OC）为0.91 V，填充系数（FF）为70％。相比之下，P1：Y6二元OSC的PCE为10.58％，J _SC为22.01 mA / cm ²，V_OC为0.86 V，FF为56％。在三元OSC中，将25 wt％的IT-4F掺入受体中可实现11.64％的增强PCE [IT-4F：Y6（25:75）]；这种增强归因于改善的J _SC为22.97 mA / cm ²，V _OC为0.87 V，FF为58％。通过将适量的IT-4F掺入受体中，可以促进激子解离和电荷传输，从而实现适当的相分离。IT-4F：Y6（25:75）三元器件的PCE改善主要归因于光子收集和激子离解的增强以及电荷重组的减少。