The role of Ti adhesion layer in electric charge transport in pentacene organic thin film transistors
Laboratory for Organic Matter Physics, University of Nova Gorica, Vipavska 13, 5000 Nova Gorica,
Corresponding author: firstname.lastname@example.org
Revised: 4 September 2009
Published online: 31 December 2009
We have performed measurements of electric current in pentacene organic thin film transistors in situ, during growth of pentacene layer. The source and the drain contacts were fabricated with varying thickness of Ti layer, followed by a thick Au layer. Our measurements confirm the hypothesis that only the first two molecular layers of pentacene are responsible for the transport of most of the electric current between the source and the drain. Consequently, several-nm thick Ti layer hinders charge carrier injection from source into the channel. This is manifested as a delayed onset of electric current when the thickness of Ti layer exceeds the thickness of two pentacene molecular layers.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010