Two new non-fullerene acceptors, IDTC and IDTO, were designed and synthesized for the application in organic solar cells (OSCs). Compared with IDTC, the introduction of electron-donating alkoxy groups of IDTO leads to a higher LUMO level with a slightly blue-shifted absorption. Using the polymer PBDB-T as donor and the two small molecules as acceptors in the conventional device structure, the IDTC-based OSC exhibits a power conversion efficiency (PCE) of 9.35% with an open-circuit voltage (V_OC) of 0.917 V, a short-circuit current density (J_SC) of 16.56 mA cm^–2, and a fill factor (FF) of 61.61%. For the OSC based on IDTO, a higher PCE of 10.02% with a V_OC of 0.943 V, a J_SC of 16.25 mA cm^–2, and an FF of 65.41% are obtained. The more balanced μ_e/μ_h, evident aggregation, and phase separation contribute to the higher FF for the device based on IDTO. The increased J_SC for the device based on PBDB-T:IDTC can be attributed to the red-shifted and stronger absorption of the PBDB-T:IDTC blend film. These results indicate fine-tuning the electronic energy and absorption of non-fullerene acceptors is feasible to improve the performance of OSCs.

中文翻译：

---

侧链效应对有机太阳能电池中有机半导体受体能级调制和器件性能的影响

设计并合成了两种新的非富勒烯受体IDTC和IDTO，用于有机太阳能电池（OSC）。与IDTC相比，IDTO的给电子给体烷氧基的引入导致较高的LUMO能级，并具有轻微的蓝移吸收。在常规器件结构中，使用聚合物PBDB-T作为施主，两个小分子作为受主，基于IDTC的OSC在0.917 V的开路电压（V _OC）下表现出9.35％的功率转换效率（PCE）。，短路电流密度（J _SC）为16.56 mA cm ^-2，填充系数（FF）为61.61％。对于基于IDTO，10.02％的较高PCE与OSC的V _OC 0.943的V，一个Ĵ_SC为16.25 mA cm ^–2，且FF为65.41％。更均衡μ _ë /μ _ħ，明显聚集，和相分离有助于基于IDTO装置中的较高的FF。基于PBDB-T：IDTC的设备的J _SC的增加可以归因于PBDB-T：IDTC混合膜的红移和更强的吸收。这些结果表明，微调非富勒烯受体的电子能量和吸收对于改善OSC的性能是可行的。