Activation of thin layers of two aromatic hydrocarbons

Abstract

The kinetics of activation currents induced by ethanol into thin layers of two aromatic hydrocarbons were investigated. The results indicate a partial chemisorption process with injection of carriers. Assuming that the increase of the current over the initial value is proportional to the covered surface, the enthalpies determined from the slope of the C 2 H 5 OH adsorption dependence were nearly identical for tetracene and for p-quaterphenyl. This suggests a similar mechanism for the effect of adsorption on the electron structure of the adsorbing molecule for both of the substances. Variations of the conductivity were observed due to the adsorption of ethanol, which suggests that hopping through localized states is the dominant mode of charge transport.