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Resonance Light Scattering in Dye-Aggregates Forming in Dewetting Droplets

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Tisserant Jean-Nicolas, Broennimann Rolf, Hany Roland, Jenatsch Sandra, Nueesch Frank A., Mezzenga Raffaele, Bona Gian-Luca, Heier Jakob,
Project Fundamental Aspects of Photocatalysis and Photoelectrochemistry / Basic Research Instrumentation for Functional Characterization
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Original article (peer-reviewed)

Journal ACS NANO
Volume (Issue) 8(10)
Page(s) 10057 - 10065
Title of proceedings ACS NANO
DOI 10.1021/nn5040839

Abstract

Small organic semiconducting molecules assembling into supramolecular J- and H- aggregates have attracted much attention due to outstanding optoelectronic properties. However, their easy and reproducible fabrication is not yet sufficiently developed for industrial applications, except for silver halide photography. Here we present a method based on aggregate precipitation during the phase separation and dewetting of the evaporating dye precursor solution. The smaller the precursor droplets, the more pronounced the J-aggregation. The aggregates cause the films to resonantly scatter incoming light. Because the dye aggregate extinction resonances have narrowest bandwidths, a wavelength selectivity is observed that exceeds the selectivity of localized surface plasmon resonances. The aggregation mechanism can be easily applied to periodically structured substrates, making the method appealing for photonic applications. We demonstrate this point with a 2D grating, where the narrow absorption range of the aggregates leads to wavelength specific (one color only) scattering.
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