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Organic Molecules on Silicon

The functionalization of semiconductor surfaces with organic molecules has attracted much interest, especially with respect to the challenges arising from the miniaturization in semiconductor device physics. In our project, we study the basic adsorption mechanism, kinetics and dynamics of organic molecules on the Si(001) using scanning tunnelling microscopy (STM), photoelectron spectroscopy (XPS, UPS), molecular beam techniques and optical second harmonic generation (SHG).


Adsorption Mechanism

stm_et2o_scheme.pngUsing Scanning Tunneling Microscopy (STM) and photoelectron spectroscopy (XPS), we study fundamental adsorption mechanisms of different functional group. e.g. in the left figure, STM images of diethyl ether on Si(001) are shown for different surface temperatures. We can distinguish between different adsorption states, namely a datively bonded intermediate state at low temperature (top) and a covalently attached final state at room temperature (bottom).

 


Adsorption Dynamics

thfsi001_king_and_wells.png
thfsi001_sticking.pngThe adsorption dynamics are studied by means of molecular beam experiments using the King and Wells method and Second Harmonic Generation (SHG). The left figure shows typical measurements of the sticking coefficient of tetrahydrofuran (THF) on Si(001). At t = 0 s, the molecular beam hits the surface and the background pressure decreases due to the adsorption of THF on the surface. Depending on surface temperature, the initial sticking coefficient decreases, as desorption from the surface becomes more likely. By changing the kinetic energy of the molecular beam, the adsorption dynamics of THF is monitored (right figure). The lower initial sticking coefficient at higher kinetic energy implies an overall nonactivated adsorption process


contact: Marcel Reutzel, Dr. Gerson Mette, Prof. Dr. Michael Dürr, Prof. Dr. Ulrich Höfer


Literature

  • M. Reutzel, G. Mette, P. Stromberger, U. Koert, M. Dürr, and U. Höfer,
    Dissociative Adsorption of Diethyl Ether on Si(001) Studied by Means of Scanning Tunneling Microscopy and Photoelectron Spectroscopy,
    J. Phys. Chem. C 119, 6018 (2015).

  • M. Lipponer, M. Dürr, and U. Höfer
    Adsorption dynamics of tetrahydrofuran on Si(001) studied by means of molecular beam techniques
    Chem. Phys. Lett. (accepted, 2015). Abstract Preprint (PDF) (© Elsevier)

  • M. Lipponer, N. Armbrust, M. Dürr, and U. Höfer,
    Adsorption dynamics of ethylene on Si(001),
    J. Chem. Phys. 136, 144703 (2012). DOI: 10.1063/1.3700180 Abstract Reprint (PDF) (© AIP)

Zuletzt aktualisiert: 02.09.2015 · armbrusn

 
 
 
Fb. 13 - Physik

Surface Physics, Renthof 5, D-35032 Marburg
Tel. +49 6421/28-24216, Fax +49 6421/28-24218, E-Mail: Irene.Dippel@physik.uni-marburg.de

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