Ballistic Electron Transport Through Organic Semiconductors

In the framework of this thesis Ballistic Electron Emission Microscopy/ Spectroscopy (BEEM/S) was used to investigate semiconductor heterostructures. Including organic semiconductors like titanylphthalocyanine (TiOPc) and hexa-peri hexabenzocoronene (HBC). Analyzing the BEEM spectra we find that the TiOPc increases the BEEM threshold voltage compared to reference Au/GaAs diodes. The energy dependent electron transmission properties of TiOPc were investigated too. Additionally, an approach for the determination of the attenuation length of TiOPc as a function of energy has been successfully introduced. Finally, the Schottky barrier heights of Au/HBC/GaAs heterostructures were investigated by BEEM. The high barrier at the HBC-GaAs interface makes this material a promising interfacial layer for increasing the open circuit voltage of GaAs Schottky barrier solar cells.

Autorentext
Dr. Techn. Dipl. Ing. Soner Özcan geb. März 1977, Diplom 2005 an der technischen Universität Wien, Promotion 2008 an der technischen Universität Wien. Hauptarbeitsgebiete: Festkörperphysik, Magnetismus, Halbleiterphysik, organische Halbleiter, elektrischer Transport durch Halbleiter Heterostrukturen.