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Thiophene-benzothiadiazole based D-A(1)-D-A(2) type alternating copolymers for polymer solar cells

Authors
Kini, Gururaj P.Quoc Viet HoangSong, Chang EunLee, Sang KyuShin, Won SukSo, Won-WookUddin, Mohammad AfsarWoo, Han YoungLee, Jong-Cheol
Issue Date
21-6월-2017
Publisher
ROYAL SOC CHEMISTRY
Citation
POLYMER CHEMISTRY, v.8, no.23, pp.3622 - 3631
Indexed
SCIE
SCOPUS
Journal Title
POLYMER CHEMISTRY
Volume
8
Number
23
Start Page
3622
End Page
3631
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/83099
DOI
10.1039/c7py00696a
ISSN
1759-9954
Abstract
A series of D-A(1)-D-A(2) type regioregular copolymers based on difluorobenzothiadiazole (DFBT) and di-alkoxybenzothiadiazole (ROBT) structures was synthesized. The copolymers were prepared with different alkyl chain lengths and branching point positions. The weaker acceptor, ROBT, was incorporated as a solubilizing moiety, while the stronger acceptor, DFBT, was used to enhance intramolecular charge transfer interactions with low-lying frontier orbital levels. The design of DFBT-ROBT copolymers ensures good planarity via intrachain noncovalent F center dot center dot center dot S, S center dot center dot center dot O, and F center dot center dot center dot H coulombic interactions. Changing the alkyl chain branching point and length had pronounced effects on the interchain packing and charge carrier transport/recombination characteristics of the resultant polymers, which in turn influenced their photovoltaic performances. P2 (with 3-hexylundecyloxy) showed tight pi-pi stacking, high charge mobility, reduced bimolecular charge recombination, and an optimal nanoscale morphology compared to P1 (with 2-hexyldecyloxy). We prepared photovoltaic devices containing a blend of the copolymers with [6,6]-phenyl-C-71-butyric acid methyl ester, and the resultant devices showed high power conversion efficiencies, 8.27% for P2, which is higher than that of P1 (6.87%). Furthermore, the alkyl side-chain length in P2 was varied systematically to study the correlation between the alkyl chain length in the interchain packing and photovoltaic performances. The variation in the alkyl chain branching was effective to modulate intermolecular packing to improve the photovoltaic performances. The optimum side chain length should be determined by carefully considering the solubility and interchain packing interactions.
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