Novel benzo(1,2-b:4,5-b’)dithiophene-based donor–acceptor conjugated polymes for polymer solar cells
Two new donor–acceptor (D-A) alternative copolymers, poly{4-(5-(4,8-bis(dodecyloxy)-6-methylbenzo[1,2-b:4,5-b’]-dithiophen-2-yl) -4–dodecylthiophen-2-yl)-2-dodecyl-7-(4-dodecyl-5-methylthiophen-2-yl)-2H-benzo[d] [ 1 – 3 ] triazole} ( P1) and poly{4-(5-(4,8-bis(dodecyloxy)-6-methylbenzo -[1,2-b:4,5-b...
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Published in | Journal of materials science. Materials in electronics Vol. 27; no. 9; pp. 9920 - 9928 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.09.2016
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Two new donor–acceptor (D-A) alternative copolymers, poly{4-(5-(4,8-bis(dodecyloxy)-6-methylbenzo[1,2-b:4,5-b’]-dithiophen-2-yl) -4–dodecylthiophen-2-yl)-2-dodecyl-7-(4-dodecyl-5-methylthiophen-2-yl)-2H-benzo[d] [
1
–
3
] triazole} (
P1)
and poly{4-(5-(4,8-bis(dodecyloxy)-6-methylbenzo -[1,2-b:4,5-b’]dithiophen-2-yl)-4-dodecylthiophen-2-yl)-2-dodecyl-9-(4-dodecyl-5methylthiophen-2-yl)-6,7-dimethyl-2H- [
1
–
3
] triazolo[4,5-g]quinoxaline} (
P2
), were designed and synthesized. Also, the effects of the structural variation on their properties, especially their UV and electrochemical behaviors, were studied. The polymers were verified by NMR and characterized by TGA, UV–vis absorption and electrochemical cyclic voltammetry. It was found that
P1
exhibits stronger π-π stacking and aggregation in solid film related to in solution state than those of
P2
. All the polymers show narrow band gaps, with the electro-chemical band gaps (E
g
EC
) 1.45 eV for
P1
and 1.61 eV for
P2
. Interestingly, the polymer
P2
exhibits power conversion efficiency (PCE) of 2.2 %, while the copolymer
P1
shows an improvement PCE of 2.9 %. It indicates that mildly tailoring the acceptor segments of the D-A copolymer is a facile and promising approach for active layer engineering to developing high performance polymer solar cells. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0957-4522 1573-482X |
DOI: | 10.1007/s10854-016-5061-9 |