Abstract
The electronic properties of thin films of potassium-doped 3,4:9,10-perylenetetracarboxylic dianhydride (PTCDA) have been studied using photoemission spectroscopy. Potassium addition results in a charge transfer to PTCDA molecules as signaled by the evolution of the valence band photoemission data, and the potassium ions mainly interact with the carbonyl end groups of the PTCDA molecules. None of the potassium-doped PTCDA films prepared in our studies is metallic, which is attributed to the effect of electronic correlations.
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