Jiang Bing-Huang, Wang Yi-Peng, Liao Chuang-Yi, Chang Yi-Ming, Su Yu-Wei, Jeng Ru-Jong, Chen Chih-Ping
Advanced Research Center for Green Materials Science and Technology, and Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 243, Taiwan.
ACS Appl Mater Interfaces. 2021 Jan 13;13(1):1076-1085. doi: 10.1021/acsami.0c19198. Epub 2020 Dec 23.
Non-fullerene organic photovoltaics (OPVs) have displayed the highest power conversion efficiencies (PCEs) among OPVs. Herein, we describe a two-donor (PM6, TPD-3F)/one-acceptor (Y6) ternary blend having an optimized blend morphology that leads to improved OPV performance. Because TPD-3F has a HOMO energy level deeper than that of PM6, the value of of the corresponding ternary device increased. Good miscibility between PM6 and TPD-3F, in conjunction with device optimization through the use of 1-chloronaphthalene as an additive, provided an optimized ternary blend morphology for efficient exciton dissociation and carrier transport and, therefore, larger PCE. Compared with the preoptimized PM6:Y6 binary device, the ternary device functioned with improvements in its short-circuit current density, value of , and fill factor. As a result, the device PCE improved from 15.5 ± 0.19 to 16.6 ± 0.25% under AM 1.5G (100 mW cm) irradiation. The champion cell exhibited a PCE of 17.0%-a value that is one of the highest for a ternary OPV. Furthermore, such devices exhibited outstanding shelf lifetimes, with long-term stability in air (25 °C, 40% humidity) without encapsulation; the performance remained high (at 15.4%) after storage for 820 h.
非富勒烯有机光伏电池（OPV）在有机光伏电池中展现出了最高的功率转换效率（PCE）。在此，我们描述了一种具有优化混合形态的双施主（PM6、TPD - 3F）/单受主（Y6）三元共混物，这种形态可提升OPV的性能。由于TPD - 3F的最高占据分子轨道（HOMO）能级比PM6的更深，相应三元器件的开路电压值增加。PM6与TPD - 3F之间良好的混溶性，再结合使用1 - 氯萘作为添加剂进行器件优化，为高效激子解离和载流子传输提供了优化的三元共混形态，从而实现了更高的PCE。与预优化的PM6:Y6二元器件相比，三元器件在短路电流密度、开路电压值和填充因子方面均有所改善。结果，在AM 1.5G（100 mW/cm²）光照下，器件的PCE从15.5±0.19%提高到了16.6±0.25%。最佳电池的PCE达到了17.0%，这是三元OPV中最高的值之一。此外，此类器件展现出了出色的储存寿命，在未封装的情况下于空气中（25°C，40%湿度）具有长期稳定性；储存820小时后性能仍保持在较高水平（15.4%）。
