Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Poster Ib

HL 36.8: Poster

Dienstag, 8. März 2016, 15:00–19:00, Poster A

Optical properties of aromatic hydrocarbons in vapor phase — •Jonathan Prexl, Andre Rinn, Robin Döring, Nils Rosemann, and Sangam Chatterjee — Faculty of Physics and Materials Sciences Center, Philipps-Universität Marburg, Renthof 5, D-35037 Marburg

Organic single crystals are generally bound by the comparatively weak van-der-Waals interaction between the molecules. Their optical response commonly shows many spectral features which resemble the molecular response in addition to solid-state phenomena such as various exciton resonances. Typically, the molecular properties are investigated in solution. This yields significant influence of the dielectric environment such as the solvent shift or aggregation effects like excimer formation. Measurements in the vapor phase offer potential advantages to solution spectroscopy as they eliminate both. Here, we present a cost-effective, low-pressure heating-chamber-based setup enabling stable high-temperature conditions combined with a low leak rate. This enables reproducible spectroscopic measurements, such as photoluminescence or linear absorption, on pure vapor of the molecules. Exemplary data on various aromatic hydrocarbons are discussed and, e.g., in the case of perylene, compared to the solution and solid state responses.