Structural Variation of Donor-Acceptor Copolymers Containing Benzodithiophene with Bithienyl Substituents to Achieve High Open Circuit Voltage in Bulk Heterojunction Solar Cells

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Structural Variation of Donor-Acceptor Copolymers Containing Benzodithiophene with Bithienyl Substituents to Achieve High Open Circuit Voltage in Bulk Heterojunction Solar Cells

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Title: Structural Variation of Donor-Acceptor Copolymers Containing Benzodithiophene with Bithienyl Substituents to Achieve High Open Circuit Voltage in Bulk Heterojunction Solar Cells
Author(s):
Kularatne, Ruvini S.;
Taenzler, Ferdinand J.;
Magurudeniya, Harsha D.;
Du, Jia;
Murphy, John W.;
Sheina, E. E.;
Gnade, Bruce E. (UT Dallas);
Biewer, Michael C. (UT Dallas);
Stefan, Mihaela C. (UT Dallas)
Format: Text
Item Type: Article
Description: Supplementary data is available at the publisher's site.
Abstract: Three new donor-acceptor copolymers P1, P2, and P3 were synthesized with benzodithiophene with bithienyl substituents as the donor and 5,6-difluorobenzo[c][1,2,5]thiadiazole, 4,7-di(thiophen-2-yl)benzo[c][1,2,5] thiadiazole, and 5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole as the acceptors, respectively. The insertion of thiophene spacer between the donor and the acceptor broadened the absorption of the polymers P2 and P3 and resulted in a red shift of ~30 nm as compared to that of the polymer P1. However, the inclusion of fluorine atoms on the polymer had detrimental effects on the photovoltaic properties of the polymers. The synthesized donor-acceptor polymers were tested in bulk heterojunction (BHJ) solar cells with [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) acceptor. Polymer P2 gave a PCE of 3.52% with PC71BM in which the active layer was prepared in chloroform with 3% v/v 1,8-diiodooctane (DIO) additive. The effect of fluorine substitution and thiophene group insertion on the UV/Vis absorbance, photovoltaic performances, morphology, and charge carrier mobilities for the polymers are discussed.
Publisher: Royal Soc Chemistry
ISSN: 2050-7488
Persistent Link: http://dx.doi.org/10.1039/c3ta13686h
http://hdl.handle.net/10735.1/3789
Bibliographic Citation: Kularatne, R. S., F. J. Taenzler, H. D. Magurudeniya, J. Du, et al. 2013. "Structural variation of donor-acceptor copolymers containing benzodithiophene with bithienyl substituents to achieve high open circuit voltage in bulk heterojunction solar cells." 1(48): 15535-15543
Terms of Use: ©2013 The Royal Society of Chemistry. This article may not be further made available or distributed.
Sponsors: "Financial support for this project from NSF (Career DMR-0956116) and Welch Foundation (AT-1740) is gratefully acknowledged. We gratefully acknowledge the NSF-MRI grant (CHE-1126177) used to purchase the Bruker Avance III 500 NMR instrument."

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