Ni Yongfeng, Liu Xuan, Liu Yang, Feng Zhendong, Tu Dandan, Guo Xin, Li Can
School of Chemical and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, P. R. China.
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Zhongshan Road 457, Dalian 116023, P. R. China.
ACS Appl Mater Interfaces. 2022 Mar 16;14(10):12461-12468. doi: 10.1021/acsami.1c23513. Epub 2022 Mar 1.
Ternary blending based on an alloy-like model has been proved as an efficient strategy for high-efficiency organic solar cells (OSCs). However, the third component that possesses excellent miscibility with host materials in the alloy-like model may trigger adverse effects for the active layer, especially at a high doping ratio. In this work, we propose a new concept of nonalloy model for the ternary OSCs in which the third component presents moderate miscibility with the acceptor and distributes at the interspace between donor and acceptor domains. The nonalloy model is constructed based on the PM6:Y6 system, and a Y6 analogue (BTP-MCA) is synthesized as the third component. The BTP-MCA can maintain initial excellent morphology of the active layer and enhance the morphological stability by acting as a frame around the host materials. As a result, ternary OSCs based on the PM6:Y6:BTP-MCA blend exhibit an impressive efficiency of 17.0% with a high open-circuit voltage of 0.87 V. Moreover, the devices present a high doping tolerance (keeping high efficiency with a doping ratio of 50%) and improved stability. This work indicates that the nonalloy model can be a promising method to fabricate efficient and stable ternary OSCs apart from the conventional alloy-like model.
基于类合金模型的三元共混已被证明是用于高效有机太阳能电池（OSC）的有效策略。然而，在类合金模型中与主体材料具有优异混溶性的第三组分可能会对活性层产生不利影响，尤其是在高掺杂比例下。在这项工作中，我们提出了一种用于三元有机太阳能电池的非合金模型的新概念，其中第三组分与受体具有适度的混溶性，并分布在供体和受体域之间的间隙中。非合金模型基于PM6:Y6体系构建，并合成了一种Y6类似物（BTP-MCA）作为第三组分。BTP-MCA可以保持活性层最初的优异形态，并通过作为主体材料周围的框架来增强形态稳定性。结果，基于PM6:Y6:BTP-MCA共混物的三元有机太阳能电池表现出令人印象深刻的17.0%的效率以及0.87 V的高开路电压。此外，这些器件具有高掺杂耐受性（在50%的掺杂比例下保持高效率）和提高的稳定性。这项工作表明，除了传统的类合金模型之外，非合金模型可能是制造高效且稳定的三元有机太阳能电池的一种有前途的方法。
