Document Type

Journal Article

Department/Unit

Department of Chemistry

Abstract

Novel p-type and low bandgap penta- and hexa-thiophenes asymmetrically endcapped with solubilizing triarylamine or triarylamino-substituted carbazole dendron and dicyanovinylgroups, namely, PhNOF-OT(n)-DCN and G2-OT(n)-DCN, respectively where n = 5–6 for solution-processable photovoltaic applications have been synthesized and investigated. With the incorporation of a solubilizing electron-donating group, the highly extended oligothiophenes are highly soluble in common organic solvents and solution-processable. Upon extending the oligothiophene backbone, there is a strong increase in the absorption around 420 nm in addition to the intramolecular charge-transfer absorption (520 nm) which results in a strong spectral broadening. The optical band-gap of these donor–acceptor oligothiophene thin-films greatly reduces to 1.85 eV. The solution-processed bulk heterojunction PVcells fabricated from these materials blended with PCBM as an acceptor showed a PCE up to 1.72% with Voc = 0.79 V in an as-fabricated device. Our findings also suggest that highly extended donor–acceptor oligomers can be useful for a p-type, low-bandgap semiconductor for solution-processable bulk heterojunction PVcells.

Publication Year

2010

Journal Title

Journal of Materials Chemistry

Volume number

20

Issue number

11

Publisher

Royal Society of Chemistry

First Page (page number)

2182

Last Page (page number)

2189

Referreed

1

DOI

10.1039/B926203B

ISSN (print)

0959-9428

Link to Publisher’s Edition

http://dx.doi.org/10.1039/B926203B

Included in

Chemistry Commons

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