Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea.
Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Republic of Korea.
ACS Appl Mater Interfaces. 2023 May 3;15(17):21306-21313. doi: 10.1021/acsami.3c01626. Epub 2023 Apr 20.
Fused aromatic rings are widely employed in organic solar cell (OSC) materials due to their planarity and rigidity. Here, we designed and synthesized four two-dimensional non-fullerene acceptors, D6-4F, D6-4Cl, DTT-4F, and DTT-4Cl, based on two new fused planar ring structures of f-DTBDT-C6 and f-DTTBDT. Owing to the desirable phase separation formed in the blend films and the higher energy levels induced by the extra alkyl groups, PM6:D6-4F-based devices achieved a high = 0.91 V with PCE = 11.10%, FF = 68.54%, and = 17.75 mA/cm. Because of the longer π-conjugation of the f-DTTBDT core with nine fused rings, DTT-4F and DTT-4Cl showed high molar extinction coefficients and broad absorption bands that enhanced the current density of OSCs. Finally, the PM6:DTT-4F-based devices achieved a = 19.82 mA/cm with PCE = 9.68%, = 0.83 V, and FF = 58.85%.
芳环稠合结构由于其平面性和刚性而被广泛应用于有机太阳能电池（OSC）材料中。在这里，我们设计并合成了四种二维非富勒烯受体 D6-4F、D6-4Cl、DTT-4F 和 DTT-4Cl，它们基于两个新的稠合平面环结构 f-DTBDT-C6 和 f-DTTBDT。由于在共混膜中形成了理想的相分离，并且额外的烷基基团导致能级升高，基于 PM6:D6-4F 的器件实现了高开路电压 = 0.91 V，光电转换效率（PCE）为 11.10%，填充因子（FF）为 68.54%，短路电流密度（JSC）为 17.75 mA/cm。由于 f-DTTBDT 核具有九个稠合环，具有更长的π共轭，DTT-4F 和 DTT-4Cl 表现出高摩尔消光系数和宽吸收带，提高了 OSCs 的电流密度。最后，基于 PM6:DTT-4F 的器件实现了高短路电流密度 JSC = 19.82 mA/cm，光电转换效率（PCE）为 9.68%，开路电压（VOC）为 0.83 V，填充因子（FF）为 58.85%。
