Ternary organic photovoltaics (OPVs) are fabricated with PBDB-T-2Cl:Y6 (1:1.2, wt/wt) as the host system and extra PC₇₁BM as the third component. The PBDB-T-2Cl:Y6 based binary OPVs exhibit a power conversion efficiency (PCE) of 15.49% with a short circuit current (J_SC) of 24.98 mA cm⁻², an open circuit voltage (V_OC) of 0.868 V and a fill factor (FF) of 71.42%. A 16.71% PCE is obtained in the optimized ternary OPVs with PBDB-T-2Cl:Y6:PC₇₁BM (1:1.2:0.2, wt/wt) active layer, resulting from the synchronously improved J_SC of 25.44 mA cm⁻², FF of 75.66% and the constant V_OC of 0.868 V. The incorporated PC₇₁BM may prefer to mix with Y6 to finely adjust phase separation, domain size and molecular arrangement in ternary active layers, which can be confirmed from the characterization on morphology, 2D grazing incidence small and wide-angle X-ray scattering, as well as Raman mapping. In addition, PC₇₁BM may prefer to mix with Y6 to form efficient electron transport channels, which should be conducive to charge transport and collection in the optimized ternary OPVs. This work provides more insight into the underlying reasons of the third component on performance improvement of ternary OPVs, indicating ternary strategy should be an efficient method to optimize active layers for synchronously improving photon harvesting, exciton dissociation and charge transport, while keeping the simple cell fabrication technology.

中文翻译：

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通过使用额外的PC 71 BM作为形态调节剂，三元有机光伏的效率超过16.7％

三元有机光伏（OPV）以PBDB-T-2Cl：Y6（1：1.2，wt / wt）作为主体系统，多余的PC ₇₁ BM作为第三组分制造。基于PBDB-T-2Cl：Y6的二进制OPV具有24.98 mA cm ^-2的短路电流（J _SC），0.868 V的开路电压（V _OC）和15.49％的功率转换效率（PCE）。填充因子（FF）为71.42％。在PBDB-T-2Cl：Y6：PC ₇₁ BM（1：1.2：0.2，wt / wt）活性层的优化三元OPV中获得了16.71％的PCE，这是由于同步改善的J _SC为25.44 mA cm ^-2，FF为75.66％，恒定V _OC合并的PC ₇₁ BM可能更喜欢与Y6混合使用，以微调三元活性层中的相分离，畴尺寸和分子排列，这可以从形态表征，二维掠入射小和广角X来确定。射线散射以及拉曼映射。此外，PC ₇₁BM可能更喜欢与Y6混合形成有效的电子传输通道，这应该有利于优化的三元OPV中的电荷传输和收集。这项工作提供了对第三组分提高三元OPV性能的根本原因的更多见解，表明三元策略应该是一种优化有源层的有效方法，以同步改善光子收集，激子离解和电荷传输，同时保持简单的电池制造技术。