Dresden 2014 – scientific programme

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DS: Fachverband Dünne Schichten

DS 27: Organic Thin Films II

DS 27.3: Talk

Wednesday, April 2, 2014, 15:30–15:45, CHE 91

Investigation of Interfaces between Pentacene and C60 - Diffusion-Controlled Growth of Two-, One-, and Zero-Dimensional C60-Nanostructures — •Tobias Breuer and Gregor Witte — Philipps-Universität Marburg, Deutschland

A variety of low dimensional C60 structures has been grown on supporting pentacene multilayers. By choice of substrate temperature during growth the effective diffusion length of evaporated fullerenes and their nucleation at terraces or step edges can be precisely controlled. AFM and SEM measurements show that this enables the fabrication of either 2D adlayers or solely 1D chains decorating substrate steps, while at elevated growth temperature continuous wetting of step edges is prohibited and instead the formation of separated C60 clusters pinned at the pentacene step edges occurs. Remarkably, all structures remain thermally stable at room temperature once they are formed. In addition, the various fullerene structures have been overgrown by an additional pentacene capping layer. Utilizing the different probe depth of XRD and NEXAFS we found that no contiguous pentacene film is formed on the 2D C60 structure, whereas an encapsulation of the 1D and 0D structures with uniformly upright oriented pentacene is achieved, hence allowing the fabrication of low dimensional buried organic hetero-structures.

[1] T. Breuer, G. Witte, ACS Applied Materials & Interfaces 5, 9740 - 9745 (2013)