A New Nonfullerene Acceptor with Near Infrared Absorption
for High Performance Ternary-Blend Organic Solar Cells with Efficiency over 13%
Gao, HH (Gao, Huan-Huan)[ 1,2,3 ] ; Sun, YN (Sun, Yanna)[ 1,2,3 ] ; Wan, XJ (Wan, Xiangjian)[ 1,2,3 ] ; Ke, X (Ke, Xin)[ 1,2,3 ] ; Feng, HR (Feng, Huanran)[ 1,2,3 ] ; Kan, B (Kan, Bin)[ 1,2,3 ] ; Wang, YB (Wang, Yanbo)[ 1,2,3 ] ; Zhang, YM (Zhang, Yamin)[ 1,2,3 ] ; Li, CX (Li, Chenxi)[ 1,2,3 ] ; Chen, YS (Chen, Yongsheng)[ 1,2,3 ]
ADVANCED
SCIENCE, 2018, 5(6): 文献号: 1800307
DOI: 10.1002/advs.201800307
WOS:000435765900024
Abstract
A new
acceptor-donor-acceptor (A-D-A) type nonfullerene acceptor, 3TT-FIC, which has
three fused thieno[3,2-b]thiophene as the central core and difluoro substituted
indanone as the end groups, is designed and synthesized. 3TT-FIC exhibits broad
and strong absorption with extended onset absorption to 995 nm and a low
optical bandgap of 1.25 eV. The binary device based on 3TT-FIC and the polymer
PTB7-Th exhibits a power conversion efficiency (PCE) of 12.21% with a high
short circuit current density (J(sc)) of 25.89 mA cm(-2). To fine-tune the
morphology and make full use of the visible region sunlight,
phenyl-C-71-butyricacid-methyl ester (PC71BM) is used as the third component to
fabricate ternary devices. In contrast to the binary devices, the ternary blend
organic solar cells show significantly enhanced EQE ranging from 300 to 700 nm
and thus an improved J(sc) with a high value of 27.73 mA cm(-2). A high PCE
with a value of 13.54% is achieved for the ternary devices, which is one of the
highest efficiencies in single junction organic solar cells reported to date.
The results provide valuable insight for the ternary devices in which the
external quantum efficiency (EQE) induced by the third component is evidently
observed and directly contributed to the enhancement of the device efficiency.
