Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, 510640, P. R. China.
Macromol Rapid Commun. 2022 Nov;43(22):e2200199. doi: 10.1002/marc.202200199. Epub 2022 Apr 21.
Although optical engineering strategy has been utilized to optimize average visible transmittance (AVT) of semi-transparent organic solar cells (ST-OSCs), judicious selection of active layer materials should be more direct and basic. Herein, an efficient ternary active layer is constructed with a wide bandgap (3.0 eV) fluorescent polymer FC-S1 as host donor, a middle bandgap polymer PM6 as guest donor, and a narrow bandgap non-fullerene Y6-BO as acceptor. Using FC-S1 as the host donor can allow more visible photons to penetrate the device. In the absence of optical engineering, the ternary ST-OSC with FC-S1:PM6:Y6-BO = 1:0.3:1.5 active layer of 30 nm thickness displays a much higher AVT of 49.28% than that of 32.34% for a PM6:Y6-BO = 1.3:1.5 based binary ST-OSC. The ternary ST-OSC provides a good power conversion efficiency of 6.01%, only slightly lower than 7.15% for the binary ST-OSC. The ternary ST-OSC also demonstrates a color rendering index (CRI) of 87 and a correlated color temperature (CCT) of 6916 K, all better than CRI of 80 and CCT of 9022 K for the binary ST-OSC. Moreover, the backbone of FC-S1 is mainly composed by fluorene and carbazole, two easily-accessible aromatic rings, which would meet low-cost concern of ST-OSCs.
虽然光学工程策略已被用于优化半透明有机太阳能电池（ST-OSC）的平均可见光透过率（AVT），但明智地选择活性层材料应该更加直接和基础。在此，我们构建了一种高效的三元活性层，其中宽带隙（3.0 eV）荧光聚合物 FC-S1 作为主体给体，中带隙聚合物 PM6 作为客体给体，以及窄带隙非富勒烯 Y6-BO 作为受体。使用 FC-S1 作为主体给体可以让更多的可见光穿透器件。在没有光学工程的情况下，厚度为 30 nm 的 FC-S1:PM6:Y6-BO = 1:0.3:1.5 三元活性层的三元 ST-OSC 显示出 49.28%的高 AVT，明显高于 PM6:Y6-BO = 1.3:1.5 二元 ST-OSC 的 32.34%。该三元 ST-OSC 提供了 6.01%的良好功率转换效率，仅略低于二元 ST-OSC 的 7.15%。该三元 ST-OSC 还具有 87 的显色指数（CRI）和 6916 K 的相关色温（CCT），均优于二元 ST-OSC 的 80 的 CRI 和 9022 K 的 CCT。此外，FC-S1 的骨架主要由芴和咔唑组成，这两种都是容易获得的芳香环，这将满足 ST-OSC 的低成本需求。
