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Dependence of charge carrier injection on the interface energy barrier in short-channel polymeric field effect transistors

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3 Author(s)
Alborghetti, S. ; CRANN and School of Physics, Trinity College, Dublin 2, Ireland ; Coey, J.M.D. ; Stamenov, P.

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The influence of contact materials on the electrical characteristics of field-effect transistors made from poly(3-hexylthiophene) with short-channel lengths of 80 nm is investigated. The thermally activated output current indicates the presence of a potential barrier at the electrode/organic contact. The barrier is not related to surface oxide and results in non-linear junction characteristics with activation voltage that can be only partially controlled via the work function of the contact metal. A Schottky contact at the metal/polymer interface arises from the band offset of the two materials and from interfacial dipole layers. Transistor operation with on/off ratio over 103 is achieved with five different electrode materials.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 14 )

Date of Publication:

Apr 2012

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