NDLI: Dithienocarbazole- and benzothiadiazole-based donor-acceptor conjugated polymers for bulk heterojunction polymer solar cells

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Constructing vertical phase separation of polymer blends via mixed solvents to enhance their photovoltaic performance

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Dithienocarbazole- and benzothiadiazole-based donor-acceptor conjugated polymers for bulk heterojunction polymer solar cells

Content Provider	Springer Nature Link
Author	Rong, Ziqing Deng, Yunfeng Xie, Zhiyuan Geng, Yanhou Wang, Fosong
Copyright Year	2014
Abstract	Donor-acceptor (D-A)-conjugated polymers P(BT-C1) and P(BT-C2), with dithieno[2,3-b;7,6-b]carbazole (C1) or dithieno[ 3,2-b;6,7-b]carbazole (C2) as D-unit and benzothiadiazole (BT) as A-unit, were synthesized. The optical bandgaps of the polymers are similar (1.84 and 1.88 eV, respectively). The structures of donor units noticeably influence the energy levels and backbone curvature of the polymers. P(BT-C1) shows a large backbone curvature; its highest occupied molecular orbital (HOMO) energy level is −5.18 eV, whereas P(BT-C2) displays a pseudo-straight backbone and has a HOMO energy level of −5.37 eV. The hole mobilities of the polymers without thermal annealing are 1.9×10$^{−3}$ and 2.7×10$^{−3}$ cm$^{2}$V$^{−1}$s$^{−1}$ for P(BT-C1) and P(BT-C2), respectively, as measured by organic thin-film transistors (OTFTs). Polymer solar cells using P(BT-C1) and P(BT-C2) as the donor and phenyl-C$_{71}$-butyric acid methyl ester (PC$_{71}$BM) as the acceptor were fabricated. Power conversion efficiencies (PCEs) of 4.9% and 5.0% were achieved for P(BT-C1) and P(BT-C2), respectively. The devices based on P(BT-C2) exhibited a higher V $_{oc}$ due to the deeper HOMO level of the polymer, which led to a slightly higher PCE.
Starting Page	294
Ending Page	300
Page Count	7
File Format	PDF
ISSN	16747291
Journal	Science in China Series B: Chemistry
Volume Number	58
Issue Number	2
e-ISSN	18691870
Language	English
Publisher	Science China Press
Publisher Date	2015-01-03
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	conjugated polymer dithienocarbazole benzothiadiazole polymer solar cells power conversion efficiency Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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Dithienocarbazole- and benzothiadiazole-based donor-acceptor conjugated polymers for bulk heterojunction polymer solar cells

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Dithienocarbazole- and benzothiadiazole-based donor-acceptor conjugated polymers for bulk heterojunction polymer solar cells