Ternary blending is an effective way to realize higher short circuit current density (J_sc) and higher power conversion efficiency (PCE) of the polymer solar cells (PSCs) by broadening and enhancing light harvests. In this work, we fabricated the ternary PSCs by using a narrow bandgap n-type organic semiconductor (n-OS) BT-IC with absorption edge extending to 850 nm as acceptor and two absorption-complementary conjugated polymer J51 and PTB7-Th with similar HOMO energy levels as donor. The ternary PSCs based on J51: PTB7-Th: BT-IC (0.5:0.2:1, w/w) without additive treatment demonstrated a higher PCE of 10.32% with a V_oc of 0.79 V, a higher J_sc of 19.55 mA cm⁻², and a FF of 67.0%. In addition, the morphology of the ternary blend active layer of the devices is quite stable after long-term thermal annealing at 130 °C.

三元混合是通过拓宽和增强光收集来实现聚合物太阳能电池（PSC）更高的短路电流密度（J _sc）和更高功率转换效率（PCE）的有效方法。在这项工作中，我们通过使用吸收带延伸至850 nm的窄带隙n型有机半导体（n -OS）BT-IC作为受主，以及两个吸收互补的共轭聚合物J51和PTB7-Th来制备三元PSC。HOMO能量水平作为供体。未经添加剂处理的基于J51：PTB7-Th：BT-IC（0.5：0.2：1，w / w）的三元PSC表现出更高的PCE为10.32％，V _oc为0.79 V，更高的J _sc为19.55 mA厘米^-2，FF为67.0％。此外，器件的三元共混物活性层在130°C长期热退火后的形态非常稳定。