Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Organic Thin Films II (joint session CPP/DS/HL, organized by DS)

CPP 46.4: Talk

Wednesday, March 22, 2017, 15:45–16:00, CHE 91

Direct photo alignment and optical patterning: Controlling molecular thin film growth on the meso-scale — •Linus Pithan^1,3, Paul Beyer¹, Laura Bogula¹, Anton Zykov¹, Peter Schäfer¹, Jonathan Rawle², Chris Nicklin², Andreas Opitz¹, and Stefan Kowarik¹ — ¹Humboldt-Universität zu Berlin, Institut für Physik, Berlin, Germany — ²Diamond Light Source, Didcot, UK — ³ESRF, Grenoble, France

A novel strategy for direct photoalignment of molecular materials using optothermal re-orientation is introduced. We show that it is possible to fabricate anisotropic and photolithographically patterned organic molecular thin films based on light-directed molecular self-assembly (LDSA).[1]

Growing tetracene thin films via LDSA on amorphous silica, we employ 532 nm laser illumination, which matches the lower Davydov absorption band, to induce preferential orientations of molecular crystal grains. Based on grazing incidence X-ray diffraction (GIXD) as well as optical spectroscopy we determine a threshold laser power for azimuthal alignment. The patterning and polarized light emission that is possible with LDSA is important for applications such as polarized organic light emitting diodes or photonic metasurfaces.

[1] L. Pithan et. al. Adv. Mater. doi:10.1002/adma.201604382