Abstract
Abstract The lowest electron conduction levels of organic semiconductors have been explored with the technique of tunneling spectroscopy. Very thin films of violanthrene-A (VEA), which is known as a typical organic semiconductor, have been prepared as tunneling barriers in AI-VEA-AI tunnel junctions. Conductance measurements on these junctions showed that the conductance depended expopentially on the thickness of the VEA barrier within the thickness range studied, 15-90 A. From this thickness dependence of the tunnel conductance, the position of the lowest levels for electron conduction was estimated to be about 0.2 eV above the Fermi level of the VEA.
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