Impact of end-capped groups on the properties of
dithienosilole-based small molecules for solution-processed organic solar cells
Chen, XJ (Chen, Xianjie)[ 1 ] ; Feng, HR (Feng, Huanran)[ 2,3,4 ] ; Lin, ZJ (Lin, Zhijing)[ 1 ] ; Jiang, ZW (Jiang, Zhaowei)[ 1 ] ; He, T (He, Tian)[ 1 ] ; Yin, SC (Yin, Shouchun)[ 1 ] ; Wan, XJ (Wan, Xiangjian)[ 2,3,4 ] ; Chen, YS (Chen, Yongsheng)[ 2,3,4 ] ; Zhang, Q (Zhang, Qian)[ 1 ] ; Qiu, HY (Qiu, Huayu)[ 1 ]
DYES AND
PIGMENTS, 2017, 147: 183-189
DOI: 10.1016/j.dyepig.2017.07.059
WOS:000412612400022
Abstract
Two new
acceptor-donor-acceptor small molecules DINDTS and DINCNDTS, with
dithienosilole as a core unit and 1,3-indanedione (IN) or malononitrile
derivative 1,3-indanedione (INCN) units as end-capped groups, respectively,
have been designed and synthesized for solution-processable bulk-heterojunction
(BHJ) solar cells. The impact of these two end-capped groups on their optical,
electrochemical properties and photovoltaic performance was systematically
studied. The optimal DINDTS:PC71BM based solar cells showed a short-circuit
current density (J(sc)) of 13.50 mA cm(-2) and power conversion efficiency
(PCE) of 6.60%. However, DINCNDTS:PC71BM based devices exhibited a poor PCE of
0.58% with a very low J(sc) of 1.82 mA cm(-2), which are mainly due to its poor
morphology of active layers. (C) 2017 Elsevier Ltd. All rights reserved.