Organic nanofibers from squarylium dyes: local morphology, optical, and electrical properties

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

doi:10.1117/12.908449

20 February 2012 Organic nanofibers from squarylium dyes: local morphology, optical, and electrical properties

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

Proceedings Volume 8258, Organic Photonic Materials and Devices XIV; 82580O (2012) https://doi.org/10.1117/12.908449
Event: SPIE OPTO, 2012, San Francisco, California, United States

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 characterization is performed via (polarized) optical microscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM).

Citation Download Citation

Frank Balzer, Manuela Schiek, Andreas Osadnik, Arne Lützen, and Horst-Günter Rubahn "Organic nanofibers from squarylium dyes: local morphology, optical, and electrical properties", Proc. SPIE 8258, Organic Photonic Materials and Devices XIV, 82580O (20 February 2012); https://doi.org/10.1117/12.908449

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