Privado María, Guijarro Fernando G, de la Cruz Pilar, Singhal Rahul, Langa Fernando, Sharma Ganesh D
Universidad de Castilla-La Mancha, Institute of Nanoscience, Nanotechnology and Molecular Materials (INAMOL), Campus de la Fábrica de Armas, Toledo 45071, Spain.
Department of Physics, Malaviya National Institute of Technology, Jaipur 302017, Rajastan, India.
ACS Appl Mater Interfaces. 2021 Feb 10;13(5):6461-6469. doi: 10.1021/acsami.0c21844. Epub 2021 Feb 1.
Organic solar cells (OSCs) that contain small molecules only were prepared with as the donor, a narrow band gap non-fullerene acceptor , and a wide band gap PCBM. The OSCs based on optimized : (1:1.2) and :PCBM (1:1.5) active layers, respectively, gave power conversion efficiencies (PCEs) of 11.18% with a short circuit current () of 19.54 mA/cm, open circuit voltage () of 0.97 V, and fill factor (FF) of 0.59, and 6.62% with a of 12.50 mA/cm, of 0.84 V, and FF of 0.63%, respectively. A PCE of 13.26% was obtained from the optimized ternary :PCBM: (1:0.3:0.9) OSCs and this arises because of the boost in a of 21.91 mA/cm and FF of 0.68. The of the ternary OSCs (0.89 V) lies between those for the OSCs based on : and :PCBM, which indicates the formation of an alloy of the two acceptors. The increase in and FF in the ternary OSCs may result from the efficient energy transfer from PCBM to as well as more charge-transfer donor/acceptor interfaces, enhanced charge carrier mobilities resulting in better adjusted charge transport, and lower bimolecular and trap-assisted recombination. The appropriate phase separation, increased crystallinity, and reduced π-π stacking distance in the ternary active layer are consistent with the enhancement in the FF for OSCs based on a ternary active layer. The results of this work suggest the merging of the fullerene acceptor into the non-fullerene acceptor to form a fullerene/non-fullerene acceptor alloy, and this may be a viable approach to obtain high-performance OSCs.
仅含小分子的有机太阳能电池（OSCs）是以 作为供体、窄带隙非富勒烯受体 和宽带隙PCBM制备而成。基于优化的 ：（1:1.2）和 ：PCBM（1:1.5）活性层的OSCs，分别给出了功率转换效率（PCEs）：短路电流（ ）为19.54 mA/cm、开路电压（ ）为0.97 V、填充因子（FF）为0.59时，PCE为11.18%；以及 为12.50 mA/cm、 为0.84 V、FF为0.63%时，PCE为6.62%。从优化的三元 ：PCBM：（1:0.3:0.9）OSCs中获得了13.26%的PCE，这是由于 提高到21.91 mA/cm以及FF提高到0.68所致。三元OSCs的 （0.89 V）介于基于 和 ：PCBM的OSCs的 之间，这表明形成了两种受体的合金。三元OSCs中 和FF的增加可能源于从PCBM到 的有效能量转移以及更多的电荷转移供体/受体界面、增强的电荷载流子迁移率导致更好的电荷传输调节，以及更低的双分子和陷阱辅助复合。三元活性层中适当的相分离、增加的结晶度和减小的π-π堆积距离与基于三元活性层的OSCs的FF增强是一致的。这项工作的结果表明将富勒烯受体并入非富勒烯受体以形成富勒烯/非富勒烯受体合金，这可能是获得高性能OSCs的一种可行方法。
