An A(2)-pi-A(1)-pi-A(2)-type small molecule donor for high-performance organic solar cells

Zhang, Q (Zhang, Qian)^{[ 1 ]} ; Sun, YN (Sun, Yanna)^{[ 2,3,4 ]} ; Chen, XJ (Chen, Xianjie)^{[ 1 ]} ; Lin, ZJ (Lin, Zhijing)^{[ 1 ]} ; Ke, X (Ke, Xin)^{[ 2,3,4 ]} ; Wang, XY (Wang, Xiaoyuan)^{[ 1 ]} ; He, T (He, Tian)^{[ 1 ]} ; Yin, SC (Yin, Shouchun)^{[ 1 ]} ; Chen, YS (Chen, Yongsheng)^{[ 2,3,4 ]} ; Qiu, HY (Qiu, Huayu)^{[ 1 ]}

JOURNAL OF MATERIALS CHEMISTRY C, 2019, 7(18): 5381-5384

DOI: 10.1039/c9tc01251f

摘要

A new A(2)--A(1)--A(2)-type small molecule denoted as BDD-IN was synthesized employing a strong electron-withdrawing unit, 3-bis(4-(2-ethylhexyl)-thiophen-2-yl)-5,7-bis(2-ethylhexyl)benzo[1,2:4,5-c]-dithiophene-4,8-dione (BDD) as the central acceptor unit (A(1)), thiophene-alkoxy benzene-thiophene as the -bridge, and indenedione (IN) as the end-capped unit (A(2)). An optimal power conversion efficiency (PCE) of 8.70% with a high open-circuit voltage (V-oc) of 0.965 V and a high fill factor (FF) of 72.3% was achieved.