Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Substituent effects on physical and photovoltaic properties of 5,6-difluorobenzo[c][1,2,5]thiadiazole-based d–a polymers: Toward a donor design for high performance polymer solar cells

Language

English

Abstract

5,6-Difluorobenzo[c][1,2,5]thiadiazole (FBT)-based conjugated donor-acceptor (D-A) polymers with straight and branched side chains were synthesized via Stille-coupling copolymerization to study their physical, optoelectronic and photovoltaic properties. The results show that both the nature of pendant side chains and the electron acceptor strength of the acceptor moiety of D-A polymers have critical impacts on material and photovoltaic properties. Better π-π stacking of polymer backbones enabled by appropriate substituents such as fluorine atoms and branched alkyl chains leads to a reasonably high power conversion efficiency of over 6% when the polymer is utilized as a donor material with PC71BM as an active layer in bulk heterojunction solar cells. © 2013 American Chemical Society.

Publication Date

2013

Source Publication Title

Macromolecules

Volume

46

Issue

24

Start Page

9587

End Page

9592

Publisher

American Chemical Society

DOI

10.1021/ma401709r

Link to Publisher's Edition

http://dx.doi.org/10.1021/ma401709r

ISSN (print)

00249297

ISSN (electronic)

15205835

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