Organic Nanofibers from Squarylium Dyes: Local Morphology, Optical, and Electrical Properties

Frank Balzer, Manuela Schiek, Andreas Osadnik, Arne Lützen, Horst-Günter Rubahn

Publikation: Bidrag til tidsskriftKonferenceartikelForskningpeer review

Abstract

Environmentally stable, non-toxic squarylium dyes with strong absorption maxima in the red and near infrared spectral region are known for almost fifty years. Despite the fact that their optoelectronic properties distinguish them as promising materials for organics based photovoltaic cells, they have regained attention only very recently. For their application in heterojunction solar cells knowledge of their nanoscopic morphology as well as nanoscopic electrical properties is paramount. In this paper thin films from two different squarylium dyes, from squarylium (SQ) and from hydroxy-squarylium (SQOH) are investigated. The thin films are either solution casted or vacuum sublimed onto substrates such as muscovite mica, which are known to promote self-assembly into oriented, crystalline nanostructures such as nanofibers. Local haracterization is performed via (polarized) optical microscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM).
OriginalsprogEngelsk
BogserieProceedings of SPIE, the International Society for Optical Engineering
Vol/bind8258
Sider (fra-til)82580O-1
Antal sider9
DOI
StatusUdgivet - 2012

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