

FOLLOWUS
a.Department of Chemistry, National Institute of Science and Technology, Palur Hills, Berhampur, Odisha India, 761008
b.Department of Chemistry, Gandhi Institute of Engineering and Technology, Gunpur, Odisha India
c.Department of Mechanical Engineering, National Institute of Science and Technology, Palur Hills, Berhampur, Odisha India, 761008
Duryodhan Sahu, E-mail:duryodhansahu18@gmail.com
Received:06 March 2017,
Revised:2017-3-30,
Accepted:03 April 2017,
Published:05 September 2017
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Ansuman Nayak, P.S. Rama Sreekanth, Santosh Kumar Sahu, et al. Structural Tuning of Low Band Gap Intermolecular Push/Pull Side-chain Polymers for Organic Photovoltaic Applications[J]. Chinese Journal of Polymer Science, 2017, 35(9): 1073-1085.
Ansuman Nayak, P.S. Rama Sreekanth, Santosh Kumar Sahu, et al. Structural Tuning of Low Band Gap Intermolecular Push/Pull Side-chain Polymers for Organic Photovoltaic Applications[J]. Chinese Journal of Polymer Science, 2017, 35(9): 1073-1085. DOI: 10.1007/s10118-017-1967-9.
A series of novel low band gap donor-acceptor (D-A) type organic co-polymers (
BT-F-TPA
BT-CZ-TPA
and
BT-SI-TPA
) consisting of electron-deficient acceptor blocks both in main chains (
M1
) and at the pendant (
M2
) were polymerized with different electron rich donor (
M3
-
M5
) blocks
i.e.
9
9-dihexyl-9
H
-fluorene
N
-alkyl-2
7-carbazole
and 2
6-dithinosilole
respectively
via
Suzuki method. These polymers exhibited relatively low band gaps (1.65-1.88 eV) and broad absorption ranges (680-740 nm). Bulk heterojunction (BHJ) solar cells incorporating these polymers as electron donors
blended with[6
6]-phenyl-C
61
-butyric acid methyl ester (PC
61
BM) or[6
6]-phenyl-C
71
-butyric acid methyl ester (PC
71
BM) as electron-acceptors in different weight ratios were fabricated and tested under 100 mW/cm
2
of AM 1.5 with white-light illumination. The photovoltaic device containing donor
BT-SI-TPA
and acceptor PC
71
BM in 1:2 weight ratio showed the best power conversion efficiency (PCE) value of 1.88%
with open circuit voltage (
V
oc
)=0.75 V
short circuit current density (
J
sc
)=7.60 mA/cm
2
and fill factor (FF)=33.0%.
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