Activation of thin layers of two aromatic hydrocarbons

 

Chem. Met. Alloys 4 (2011) 31-37

 

Sylwester KANIA, Janusz KULIŃSKI

 

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 C2H5OH 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.

 

 

Experimental set-up for activating the films and for recording the I-t characteristics of the dark current induced by the activation process. Insert shows the construction of the upper aluminium electrode.

 

Keywords

Charge transport / Acenes / Adsorption / Tetracene / p‑quaterphenyl