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Berlin 2005 – scientific programme

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SYOO: Organic Optoelectronics and Photonics

SYOO 6: Poster

SYOO 6.27: Poster

Monday, March 7, 2005, 18:00–20:00, Poster TU A

Surface Stress in Organic Thin Film Growth - Pentacene on Si(111) — •Peter Kury1, Frank Meyer zu Heringdorf1, Kelly Roos2, Kevin Kimberlin2, and Michael Horn-von Hoegen11Institut für Laser- und Plasmaphysik, Universität Duisburg-Essen, 45141 Essen — 2Bradley University, Peoria (IL), USA

Stress and strain are well established physical quantities in organical chemistry as well as in surface physics and have been investigated for decades. The formation of ordered layers of organic molecules on a crystalline surface, however, is a topic that has gained recently enormous interest and the investigation of the influence of stress on the morphology is a new challenge [1]. Due to the exclusive van der Waals interactions inside the organic material only small effects are to be expected during film growth, although covalent interactions are not unusual at the interface between the organic molecules at semiconductor surfaces like Si(111) [2]. Here we present high resolution surface stress measurements by means of surface stress induced optical deflection (SSIOD) on the molecular layer by layer growth [3] of the high performance organic semiconductor pentacene on Si(111). We demonstrate how the surface stress is correlated to the morphology by comparison of SSIOD data with microscopy (AFM,STM,PEEM).
[1]: M. Gsell et al., Science 280, 717 (1998)
[2]: R. J. Hamers et al., Acc. Chem. Res. 33, 617 (2000)
[3]: F. Meyer zu Heringdorf et al., Nature 412, 517 (2001)

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