Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Organic Electronics and Photovoltaics - Layer Morphology and Molecular Aggregation

CPP 3.8: Vortrag

Montag, 12. März 2018, 11:45–12:00, C 243

Investigating molecules response toward laser illumination during laser directed self-assembly (LDSA) — •Andika Asyuda¹, Linus Pithan^1,2, Anton Zykov¹, Andreas Opitz¹, and Stefan Kowarik^1,3 — ¹Humboldt-Universität zu Berlin, Institut für Physik, Berlin — ²European Synchrotron Radiation Facility, Experiments Division ID03, Grenoble — ³Bundesanstalt für Materialforschung und Prüfung, 8.6 Fibre Optic Sensors, Berlin

A growth of tetracene thin film is among intensively studied vapor-deposited molecular film. While tetracene is usually grown as randomly oriented polycrystalline film, Pithan et al [1] demonstrated a way to use laser illumination during thin film growth for aligning the growing crystallites in the film. The key of this approach is choosing a laser wavelength matching 1 of its 2 Davydov components.

An aligned crystalline film is indeed desirable for device realization, such as transistor, due to anisotropic carrier transport in organic semiconductors. However, there is no investigation yet of structural properties of photoaligned film, such as roughness, island surface area, and island density. In this contribution, various growth parameters of a photoaligned tetracene film are discussed, particularly for their influences to film morphology and anisotropy. Recent AFM data consistently show an increase in grain size due to photoalignment, regardless of substrate temperature and molecular flux during the growth.

[1] L. Pithan, et al, Adv. Mater. 2017, 29, 1604382