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Issue 5, 2013
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Enhanced photocurrent generation by folding-driven H-aggregate formation

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Abstract

A novel bis(merocyanine) dye has been synthesized and its folding and aggregation behavior has been elucidated in dependence on the solvent polarity. Extended cofacially π-stacked H-aggregates could be prepared in nonpolar solvents based on the preorganized folded dimer structure of the dye exhibiting a more than 120 nm hypsochromic shift of the absorption band. Furthermore, incorporation of such H-aggregate domains in bulk heterojunction (BHJ) solar cells by careful adjustment of processing conditions afforded a nearly twofold increase in the photocurrent generation. Our detailed investigations on the external quantum efficiencies of these blends reveal that the increase of the short-circuit current density JSC stems from the H-aggregated dye manifold in the photoactive layer of the solar cell devices.

Graphical abstract: Enhanced photocurrent generation by folding-driven H-aggregate formation

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Publication details

The article was received on 29 Jan 2013, accepted on 22 Feb 2013 and first published on 06 Mar 2013


Article type: Edge Article
DOI: 10.1039/C3SC50263E
Citation: Chem. Sci., 2013,4, 2071-2075
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    Enhanced photocurrent generation by folding-driven H-aggregate formation

    A. Zitzler-Kunkel, M. R. Lenze, K. Meerholz and F. Würthner, Chem. Sci., 2013, 4, 2071
    DOI: 10.1039/C3SC50263E

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