Manipulating backbone structure with various conjugated spacers to enhance photovoltaic performance of D-A-type two-dimensional copolymerse
Journal article, 2014
A class of low band-gap two-dimensional conjugated polymers of PBDTT-FQ PBDTT-TQ PBDTT-BTQ and PBDTT-TTQ was designed and synthesized, which contains the same di(alkylthiophene)-substituted benzo[1,2-b:4,5-b']dithiophene (BDTT) and 6,7-difluoro-quinoxaline (Q) units, as well as various conjugated spacers of furan, thiophene, bithiophene and thieno[3,2-b]thiophene in the main chain. Significant effect of the varied spacers between the BDTT and Q units on the thermal, optical, electrochemical and photovoltaic properties was investigated and observed for these two-dimensional copolymers in the polymer solar cells. The maximum power conversion efficiency of 5.9% with a short circuit current of 13.7 mA/cm(2) and a fill factor of 0.56 was obtained for the PBDTT-TQ with thiophene spacer in the bulk hetero-junction PSCs using [6,6]-phenyl-C-71-butyric acid methyl ester as acceptor.
Two-dimensional copolymers
Polymer solar cells
Conjugated spacers
Photovoltaic properties
Author
D. F. Dang
Xiangtan University
M. J. Xiao
Chinese Academy of Sciences
Xiangtan University
P. Zhou
Xiangtan University
J. W. Shi
Xiangtan University
Qiang Tao
Chalmers, Chemical and Biological Engineering, Polymer Technology
H. Tan
Xiangtan University
Y. F. Wang
Xiangtan University
X. C. Bao
Chinese Academy of Sciences
Y. Liu
Xiangtan University
Ergang Wang
Chalmers, Chemical and Biological Engineering, Polymer Technology
R. Q. Yang
Chinese Academy of Sciences
W. G. Zhu
Xiangtan University
Organic Electronics: physics, materials, applications
1566-1199 (ISSN)
Vol. 15 11 2876-2884Subject Categories
Polymer Technologies
DOI
10.1016/j.orgel.2014.08.022