Issue 17, 2016

Development of strongly absorbing S,N-heterohexacene-based donor materials for efficient vacuum-processed organic solar cells

Abstract

A series of terminal dicyanovinylene (DCV)-substituted S,N-heterohexacenes with variable lengths of alkyl chains were synthesized and characterized for application in vacuum-processed planar-heterojunction and bulk-heterojunction organic solar cells. X-ray single crystal analysis of hexyl-substituted derivative 4 revealed that the molecules are ordered in columns via π–π-stacking. While the influence of the alkyl chain length is negligible on the optoelectronic properties, an odd–even effect was observed with respect to the photovoltaic performance. Vacuum-processed planar-heterojunction organic solar cells prepared using DCV-substituted S,N-heterohexacenes as electron donors and C60 as the acceptor showed extraordinary high efficiencies of up to 5.0%. Bulk-heterojunction solar cells incorporating pentyl derivative 3 and C60 led to excellent power conversion efficiencies of up to 7.1% exceeding those of previously reported S,N-heteropentacenes.

Graphical abstract: Development of strongly absorbing S,N-heterohexacene-based donor materials for efficient vacuum-processed organic solar cells

Supplementary files

Article information

Article type
Paper
Submitted
28 Oct 2015
Accepted
21 Dec 2015
First published
22 Dec 2015

J. Mater. Chem. C, 2016,4, 3715-3725

Author version available

Development of strongly absorbing S,N-heterohexacene-based donor materials for efficient vacuum-processed organic solar cells

C. Wetzel, A. Mishra, E. Mena-Osteritz, K. Walzer, M. Pfeiffer and P. Bäuerle, J. Mater. Chem. C, 2016, 4, 3715 DOI: 10.1039/C5TC03539B

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