Regensburg 2007 – scientific programme

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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 8: Poster Session SYOE

SYOE 8.30: Poster

Tuesday, March 27, 2007, 18:00–20:00, Poster B

Intermolecular interaction in PTCDA, NTCDA, and NDCA as determined by comparative gas phase and thin film photoemission spectroscopy — •Jens Sauther, Jens Wüsten, Stefan Lach, and Christiane Ziegler — Department of Physics, University of Kaiserslautern, D-67663 Kaiserslautern

The interaction of pi-conjugated organic molecules among each other influences such important properties as their electronic structure and their thin film growth behavior. Both are of utmost interest for the development of organic semiconductor devices.

Here, ultraviolet photoemission spectra of pi-conjugated organic molecules in the gas phase are compared with ultraviolet photoemission spectra of those molecules in the condensed phase and with DFT calculations. This allows to obtain values for the effects of electron correlation, intra- and intermolecular polarization which cannot be determined by thin film spectra alone. Furthermore this analysis gives information about the character of intermolecular bonding. Such an analysis was performed on the related molecules 3,4,9,10-perylene-tetracarboxylic acid dianhydride (PTCDA), 1,4,5,8-naphthalene-tetracarboxylic acid dianhydride (NTCDA) and 1,8-naphthalene dicarboxylic acid anhydride (NDCA). All three systems show intermolecular hydrogen bridge bonding involving the anhydride group(s).