Collection of photo-generated charge carriers is of significance in organic photovoltaic devices. Herein, we focus on systematically exploring the effective methods to improve the charge collection efficiency in organic solar cells based on PBDB-T: ITIC. In the active layer, we observe that the energy level bending at the interface of acceptor/donor is influential to the recombination of charge carriers. For extracting electrons efficiently, we propose that using SnO₂ instead of ZnO as the electron conducting layer is advantageous in improving short-circuit current (J_sc), power conversion efficiency (PCE), and particularly stability. To unveil the dynamics of hole collection, we use different metals as the anode and find out that enlarging the work function of the anode close to the highest occupied molecular orbital (HOMO) of the donor is beneficial for enhancing the open-circuit voltage (V_oc), J_sc, fill factor (FF) and thus PCE. The optimized device delivers a PCE of 10.77%. Insights on how to efficiently extract photo-generated charge carriers are elaborated systematically.

光生电荷载流子的收集在有机光伏器件中具有重要意义。在本文中，我们集中于系统研究基于PBDB-T：ITIC的提高有机太阳能电池中电荷收集效率的有效方法。在活性层中，我们观察到受体/供体界面处的能级弯曲对电荷载流子的重组有影响。为了有效地提取电子，我们建议使用SnO ₂代替ZnO作为电子导电层有利于提高短路电流（J _sc），功率转换效率（PCE），尤其是稳定性。为了揭示空穴收集的动力学过程，我们使用不同的金属作为阳极，发现将阳极的功函数扩大到施主的最高占据分子轨道（HOMO）附近有利于提高开路电压（V _oc），J _sc，填充因子（FF）以及PCE。经过优化的器件可提供10.77％的PCE。系统地阐述了有关如何有效提取光生电荷载流子的见解。