Contact resistance variation in top-contact organic thin-film transistors with the deposition rate of Au source/drain electrodes

Abstract We investigated the effect of the deposition rate of Au source/drain electrodes on the contact resistance of the top-contact organic thin-film transistors (OTFTs). For the formation of source/drain contacts, Au was thermally deposited at the different rates of 0.5, 1.0, 5.0, and 13.0 A/s. With increasing the Au deposition rate, the contact resistance extracted at the gate voltage of − 30 V could be reduced from 14 × 10 6 to 2.4 × 10 6  Ω, resulting in the characteristic improvements of the top-contact OTFT. It is also found that the contact resistance significantly affects the off-state currents of the device having the short channel length of 10 μm. The control of the deposition rate of source/drain electrodes is suggested to optimize the contact properties of the top-contact OTFTs as well as the device performance.

[1]  Liang Zhang,et al.  Performance enhancement of organic thin-film transistors using WO3-modified drain/source electrodes , 2009 .

[2]  Stephen R. Forrest,et al.  Organic optical bistable switch , 2003 .

[3]  Ute Zschieschang,et al.  High-mobility polymer gate dielectric pentacene thin film transistors , 2002 .

[4]  S. M. Sze,et al.  Physics of semiconductor devices , 1969 .

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

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

[7]  John A. Rogers,et al.  Contact resistance in organic transistors that use source and drain electrodes formed by soft contact lamination , 2003 .

[8]  P. Heremans,et al.  Design of an organic pixel addressing circuit for an active-matrix OLED display , 2002 .

[9]  Thomas N. Jackson,et al.  Contact resistance extraction in pentacene thin film transistors , 2003 .

[10]  J. Rogers,et al.  Contact resistance in organic thin film transistors , 2004 .

[11]  Mingsheng Xu,et al.  Thickness dependence of mobility of pentacene planar bottom-contact organic thin-film transistors , 2008 .

[12]  S. Lee,et al.  Reduction in Contact Resistance of Pentacene Thin-Film Transistors by Formation of an Organo-Metal Hybrid Interlayer , 2009 .

[13]  J. Park,et al.  Study on the characteristics of metal-organic interface for organic thin-film transistors , 2005 .

[14]  P. Wisk,et al.  Refractive index perturbations in optical fibers resulting from frozen-in viscoelasticity , 2004 .