Xu Xiang, Sun Chaoyuan, Jing Jianhua, Niu Tianqi, Wu Xiao, Zhang Kai, Huang Fei, Xu Qinghua, Yuan Jun, Lu Xinhui, Zhou Yonghua, Zou Yingping
State Key Laboratory of Powder Metallurgy, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, School of Materials Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510640, China.
ACS Appl Mater Interfaces. 2022 Aug 17;14(32):36582-36591. doi: 10.1021/acsami.2c07883. Epub 2022 Aug 8.
A ternary strategy is viable to minimize the trade-off between short-circuit current density () and open-circuit voltage () in organic solar cells. Generally, the ternary OSCs can achieve a higher PCE than the binary counterparts by subtly utilizing the particular photoelectric properties of the third material. In this regard, we choose BTP-CC with a higher-lying LUMO level based on a fused TPBT (dithienothiophen[3.2-]-pyrrolobenzothiadiazole) central framework and CC (2-(6-oxo-5,6-dihydro-4-cyclopenta []thiophen-4-ylidene) malononitrile) flanking groups as the third component to broaden the light-absorption spectrum, regulate the bulk heterojunction (BHJ) morphology, improve the , and reduce the charge recombination in OSCs. In addition, BTP-CC demonstrates intense intermolecular energy transfer to Y6 by fluorescence resonance energy transfer (FRET) pathway, which is due to the photoluminescence (PL) spectrum of BTP-CC covering the absorption region of Y6. The PM6:Y6:BTP-CC based ternary OSC achieves a champion PCE of 17.55%. Further investigation indicates that introduction of BTP-CC could reduce the trap states in OSCs, leading to an increased charge carrier density. Moreover, the incorporation of BTP-CC could improve the device stability. These results demonstrated that BTP-CC is important in improving the photovoltaic performance of ternary OSCs, and this work also provides a guideline for constructing ideal ternary OSCs in the future.
三元策略对于最小化有机太阳能电池的短路电流密度（）和开路电压（）之间的权衡是可行的。一般来说，三元有机太阳能电池可以通过巧妙利用第三种材料的特殊光电特性，实现比二元电池更高的功率转换效率（PCE）。在这方面，我们选择了基于稠合TPBT（二噻吩并噻吩[3.2 - ] - 吡咯并苯并噻二唑）中心骨架和CC（2 - （6 - 氧代 - 5,6 - 二氢 - 4 - 环戊并[]噻吩 - 4 - 亚基）丙二腈）侧基的具有较高LUMO能级的BTP - CC作为第三组分，以拓宽光吸收光谱、调节体相异质结（BHJ）形态、提高，以及减少有机太阳能电池中的电荷复合。此外，BTP - CC通过荧光共振能量转移（FRET）途径向Y6展示了强烈的分子间能量转移，这是由于BTP - CC的光致发光（PL）光谱覆盖了Y6的吸收区域。基于PM6:Y6:BTP - CC的三元有机太阳能电池实现了17.55%的最高PCE。进一步的研究表明，引入BTP - CC可以减少有机太阳能电池中的陷阱态，导致电荷载流子密度增加。此外，加入BTP - CC可以提高器件稳定性。这些结果表明BTP - CC在提高三元有机太阳能电池的光伏性能方面很重要，并且这项工作也为未来构建理想的三元有机太阳能电池提供了指导。
