Evaluation of organic sub-monolayers by X-ray based measurements under gracing incident conditions

¹ Institute of Solid State Physics, Graz University of Technology, Graz, Austria
² Institute of Nanostructured Materials and Photonics, Joanneum Research Forschungsgesellschaft mbH, Weiz, Austria

Corresponding author: o.werzer@gmx.at

Received: 16 September 2008
Revised: 20 November 2008
Accepted: 20 January 2009
Published online: 27 March 2009

Abstract

The structural investigations of model organic systems like pentacene on silicon oxide in the monolayer regime is very important for the basic understanding of initial nucleation process together with the electronic performance of transistor devices. A method for the evaluation of the island formation and layer closing of the first monolayer is introduced. The method is based on specular X-ray reflectivity and diffuse scattering and reveal integral information on the coverage together with the size and separation of pentacene islands. The results are in good agreement with AFM investigation that encourages the use of this type of investigation in in-situ experiments.