The role of Ti adhesion layer in electric charge transport in pentacene organic thin film transistors

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 on...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2010-02, Vol.73 (3), p.341-346
Main Authors: Petrovic, A., Bratina, G.
Format: Article
Language:English
Subjects:
Applied sciences
Complex Systems
Condensed Matter Physics
Dielectric films
Electronics
Exact sciences and technology
Fluid- and Aerodynamics
Physics
Physics and Astronomy
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Solid State and Materials
Solid State Physics
Thin films
Transistors
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Summary: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.
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/e2009-00441-7