Zhou Yuanyuan, Li Miao, Yu Na, Shen Shuaishuai, Song Jinsheng, Ma Zaifei, Bo Zhishan
Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China.
Engineering Research Center for Nanomaterials, Henan University, Kaifeng 475004, China.
ACS Appl Mater Interfaces. 2022 Feb 2;14(4):6039-6047. doi: 10.1021/acsami.1c22520. Epub 2022 Jan 21.
Nonfused-ring electron acceptors have attracted much attention in recent years due to their advantages of simple synthetic routes, high yields, low costs, reasonable power conversion efficiencies (PCEs), and so on. Herein, three simple A-π-D-π-A-type acceptors (, , and ) comprising a tricyclic fused-ring core, two 2,5-bis(alkyloxy)phenylene spacers, and two difluorinated terminal groups (DF-IC) were developed. Compared with , and exhibit higher molar extinction coefficients, stronger crystallinity, and more orderly stacking. The PBDB-T:-based blend film shows suitable phase separation and higher and more balanced charge mobilities. Finally, the photovoltaic devices based on give an outstanding PCE of 13.26% with a small nonradiative voltage loss of 0.23 eV.
近年来，非稠环电子受体因其合成路线简单、产率高、成本低、功率转换效率合理等优点而备受关注。在此，开发了三种简单的A-π-D-π-A型受体（、和），它们由一个三环稠环核心、两个2,5-双（烷氧基）亚苯基间隔基和两个二氟端基（DF-IC）组成。与相比，和表现出更高的摩尔消光系数、更强的结晶度和更有序的堆积。基于PBDB-T:的共混膜显示出合适的相分离以及更高且更平衡的电荷迁移率。最后，基于的光伏器件给出了13.26%的出色功率转换效率，非辐射电压损失小至0.23 eV。
