An acceptor-donor-acceptor type non-fullerene acceptor with an asymmetric backbone for high performance organic solar cells

Jiao, CC (Jiao, Cancan); Guo, ZQ (Guo, Ziqi); Sun, BQ (Sun, Binqiao); Yi, YQQ (Yi, Yuan-qiu-qiang); Meng, LX (Meng, Lingxian); Wan, XJ (Wan, Xiangjian)^{[ 1 ]} ; Zhang, MT (Zhang, Mingtao); Zhang, HT (Zhang, Hongtao); Li, CX (Li, Chenxi); Chen, YS (Chen, Yongsheng)

JOURNAL OF MATERIALS CHEMISTRY C, 2020, 8(18): 6293-6298

DOI: 10.1039/d0tc00981d

摘要

An A-D-A type acceptor CC10 with an asymmetric D unit has been designed and synthesized by introducing an alkylbenzene unit into a symmetric acceptor CC5. Compared with the symmetric CC5, the asymmetric CC10 showed a similar absorption range and energy level, but better pi-pi stacking, enhanced electron mobility and optimized microscopic morphology. As a result, the CC10-based organic solar cells demonstrated a high PCE of 11.78%, better than that of 6.91% for CC5-based devices. The significantly improved device performance caused by only a minor modification in the molecular backbone indicates that there is substantial potential of the asymmetric strategy for designing high performance active layer materials.