An oxygen heterocycle-fused fluorene based non-fullerene acceptor for high efficiency organic solar cells

Ke, X (Ke, Xin); Meng, LX (Meng, Lingxian); Wan, XJ (Wan, Xiangjian); Sun, YN (Sun, Yanna); Guo, ZQ (Guo, Ziqi); Wu, SM (Wu, Simin); Zhang, HT (Zhang, Hongtao); Li, CX (Li, Chenxi); Chen, YS (Chen, Yongsheng)^{[ 1 ]}

MATERIALS CHEMISTRY FRONTIERS, 2020, 4(12): 3594-3601

DOI: 10.1039/d0qm00287a

摘要

A new acceptor-donor-acceptor (A-D-A) small molecule acceptor, named FCO-2F, is designed and synthesized based on the previous acceptor F-H. By inserting an oxygen atom into the backbone of F-H and fluorination on the end group, FCO-2F shows a much red-shifted absorption compared with F-H, and also a wider absorption up to 830 nm. Using polymer PM6 as the donor, the organic solar cell (OSC) devices based on FCO-2F offer a power conversion efficiency (PCE) of 13.36%, with a much improved short circuit current (J(sc)) of 20.90 mA cm(-2).