Liu Chunyan, Wu Zhihui, Qiu Nailiang, Li Chenxi, Lu Yan
School of Materials Science & Engineering, Tianjin Key Laboratory for Photoelectric Materials and Devices, Key Laboratory of Display Materials & Photoelectric Devices, Ministry of Education, Tianjin University of Technology, Tianjin 300384, China.
School of Chemistry, Chemical Engineering and Materials, Jining University, Qufu 273155, China.
ACS Appl Mater Interfaces. 2023 Feb 22;15(7):9764-9772. doi: 10.1021/acsami.2c21776. Epub 2023 Feb 8.
To construct efficient donor:donor:acceptor (D:D:A)-type ternary devices, two new selenophene-containing small-molecule (SM) donors named FSBTSeEHR and FSBTSeHR have been designed and synthesized that show broader and red-shifted absorption spectra than the thiophene analogues. With the introduction of SM donors into the D18:CH-6F host system, enhanced light harvesting and charge transport were achieved, benefiting from more complementary absorptions and cascaded energy levels. Furthermore, the doping of the SM donor could effectively modulate the micromorphology and enable a more suitable phase separation size in the active layer. After systematic optimization, the FSBTSeEHR-based ternary organic solar cell (TOSC) exhibited an excellent power conversion efficiency (PCE) of 18.02% with a high open-circuit voltage () of 0.905 V, short-circuit current density () of 26.41 mA cm, and fill factor (FF) of 0.754. By contrast, the FSBTSeHR counterpart showed a superior efficiency of 18.55% due to the higher (26.91 mA cm) and FF (0.761). The outstanding PCEs of D:D:A-type TOSCs based on our SM donors, FSBTSeEHR and FSBTSeHR, are significantly higher than those of the corresponding binary host system (16.86%) and among the highest values reported to date. This work demonstrates that D:D:A-type TOSCs have tremendous potential to achieve superior performances through elaborate design of the SM donor guest and reasonable combination of D and A ingredients.
供体：受体（D:D:A）型三元器件，设计并合成了两种含硒吩的新型小分子（SM）供体，命名为FSBTSeEHR和FSBTSeHR，它们的吸收光谱比噻吩类似物更宽且发生红移。通过将SM供体引入D18:CH-6F主体体系，实现了光捕获和电荷传输的增强，这得益于更多的互补吸收和级联能级。此外，SM供体的掺杂可有效调节微观形貌，并在活性层中实现更合适的相分离尺寸。经过系统优化，基于FSBTSeEHR的三元有机太阳能电池（TOSC）表现出优异的功率转换效率（PCE），为18.02%，开路电压（）为0.905 V，短路电流密度（）为26.41 mA cm，填充因子（FF）为0.754。相比之下，基于FSBTSeHR的对应器件由于更高的（26.91 mA cm）和FF（0.761），表现出18.55%的更高效率。基于我们的SM供体FSBTSeEHR和FSBTSeHR的D:D:A型TOSC的出色PCE显著高于相应的二元主体体系（16.86%），且是迄今为止报道的最高值之一。这项工作表明，D:D:A型TOSC通过精心设计SM供体客体以及合理组合D和A成分，具有实现卓越性能的巨大潜力。
