Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 69: Poster Session: II-VI semiconductors; Organic semiconductors; Heterostructures
HL 69.10: Poster
Mittwoch, 13. März 2013, 16:00–20:00, Poster A
Surface functionalization and optical characterization of self-organized surface structures on sublimation grown polyaromatic single crystals — •Teresa Schmeiler1, Stefan Thoms1, and Jens Pflaum1,2 — 1Inst. Exp. Phys. VI, Julius-Maximilians-University of Würzburg, 97074 Würzburg — 2ZAE Bayern e.V., 97074 Würzburg
Previously we presented different approaches, such as epitaxial growth or surface etching, to generate micrometer-sized 3D pyramidal surface structures on polyaromatic single crystals of rubrene and diphenylanthracene. By means of FDTD-simulations as well as photoluminescence measurements an enhanced luminescence emission at the lateral edges has been observed. Upon further optimization this could lead to cavity structures with defined optical properties. In this context, one of the major drawbacks are refection losses at the interfaces of these organic structures resulting in a significantly reduced quality factor Q. In this contribution we will discuss a possible solution to this problem by means of an additional metallic, e.g. gold, cover layer. Optical investigation revealed an enhanced emission at the pyramidal cone ends when covered by a 50 nm gold layer. Consequently, the influence of surface functionalization on the cavity quality factor as well as on the population density of optical states was investigated as a function of material and cover layer thickness. Complementary, the coated surface structures were analysed by AFM as well as SEM which showed a homogenous metallic surface coverage. Financial support by the DFG research unit FOR1809 is gratefully acknowledged.