Organic field-effect transistors with reduced contact resistance

In this letter, the authors report a reduction in the contact resistance between pentacene and Au source/drain electrodes of organic field-effect transistors (OFETs). By immersing the Au electrodes in a sulfuric acid and hydrogen peroxide mixture, the injection barrier between the Au electrodes and pentacene was lowered by approximately 0.2eV and the contact resistance significantly decreased. The fabricated bottom-contact OFETs revealed a field-effect mobility of more than 0.66cm2∕Vs at a channel length ranging from 3to30μm, which is comparable to that of top-contact OFETs with a 50μm channel length.

[1]  M. Grell,et al.  "Electrode specific electropolymerization of ethylenedioxythiophene: Injection enhancement in organic transistors" , 2005 .

[2]  Y. Aoyagi,et al.  Direct observation of contact and channel resistance in pentacene four-terminal thin-film transistor patterned by laser ablation method , 2004 .

[3]  W. Fix,et al.  Fast polymer integrated circuits , 2002 .

[4]  N. Koch,et al.  Tuning the hole injection barrier height at organic/metal interfaces with (sub-) monolayers of electron acceptor molecules , 2005 .

[5]  Zheng-Hong Lu,et al.  Chemical structure of Al/LiF/Alq interfaces in organic light-emitting diodes , 2002 .

[6]  Chieh-Wei Chen,et al.  High-performance organic thin-film transistors with metal oxide/metal bilayer electrode , 2005 .

[7]  Jiro Kasahara,et al.  Reduction of contact resistance in pentacene thin-film transistors by direct carrier injection into a-few-molecular-layer channel , 2004 .

[8]  H. Klauk,et al.  Contact resistance in organic thin film transistors , 2001 .

[9]  Takao Someya,et al.  Nanoscale organic transistors that use source/drain electrodes supported by high resolution rubber stamps , 2003 .

[10]  Heinz-Georg Nothofer,et al.  Effects of polymer sidebranching in double- and single-layer polyfluorene light-emitting diodes , 2002 .

[11]  Y. Ouchi,et al.  Examination of band bending at buckminsterfullerene (C60)/metal interfaces by the Kelvin probe method , 2002 .

[12]  Ute Zschieschang,et al.  Organic electronics on paper , 2004 .