Su Yi-Jia, Nie Hebing, Chang Chun-Feng, Huang Sheng-Ci, Huang Yi-Hsuan, Chen Tsung-Wei, Hsu Kuo-Kai, Lee Tzu-Yuan, Shih Hung-Min, Ko Chung-Wen, Chen Jiun-Tai, Hsu Chain-Shu
Department of Applied Chemistry, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan.
Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan.
ACS Appl Mater Interfaces. 2021 Dec 15;13(49):59043-59050. doi: 10.1021/acsami.1c19627. Epub 2021 Dec 5.
In this work, two asymmetric non-fullerene acceptors (NFAs), BTP-EHBO-4F and BTP-PHD-4F, are designed to be applied in green-solvent-processable organic photovoltaics (OPVs). BTP-EHBO-4F and BTP-PHD-4F show good solubilities in green solvent -xylene. As a result, PM6:BTP-EHBO-4F-based devices exhibit outstanding photovoltaic performances using -xylene as a solvent. By comparison, due to the poor solubility of Y6 in -xylene, PM6:Y6-based devices show poor performances. Owing to the favorable phase separation, molecule packing, and orientation observed from atomic force microscopy (AFM) and grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements, PM6:BTP-PHD-4F-based devices demonstrate a PCE of 15.91% with a of 0.87 V, a of 25.64 mA/cm, and an FF of 71.34%. Moreover, PM6:BTP-EHBO-4F-based devices exhibit an impressive PCE of 16.82% with a of 0.85 V, a of 26.12 mA/cm, and an FF of 75.78%, which is outstanding for OPVs using -xylene as a solvent.
在这项工作中，设计了两种不对称非富勒烯受体（NFAs），即BTP-EHBO-4F和BTP-PHD-4F，用于可在绿色溶剂中加工的有机光伏电池（OPVs）。BTP-EHBO-4F和BTP-PHD-4F在绿色溶剂二甲苯中表现出良好的溶解性。因此，基于PM6:BTP-EHBO-4F的器件以二甲苯作为溶剂时展现出优异的光伏性能。相比之下，由于Y6在二甲苯中的溶解性较差，基于PM6:Y6的器件表现不佳。基于原子力显微镜（AFM）和掠入射广角X射线散射（GIWAXS）测量观察到的良好相分离、分子堆积和取向，基于PM6:BTP-PHD-4F的器件的光电转换效率（PCE）为15.91%，开路电压（Voc）为0.87 V，短路电流密度（Jsc）为25.64 mA/cm²，填充因子（FF）为71.34%。此外，基于PM6:BTP-EHBO-4F的器件展现出令人印象深刻的16.82%的光电转换效率，开路电压为0.85 V，短路电流密度为26.12 mA/cm²，填充因子为75.78%，这对于使用二甲苯作为溶剂的有机光伏电池来说是非常出色的。
