As the channel length of organic thin-film transistors (TFTs) is reduced in order to improve the dynamic TFT performance, the total resistance and hence the effective field-effect mobility and the transconductance of the TFTs become more and more limited by the contact resistance, rather than by the channel resistance.

Using the transmission line method (TLM) we have measured and analyzed the contact resistance of organic transistors based on various semiconductors, such as pentacene, DNTT, C10-DNTT, DPh-DNTT and NTCDI-Cl2-(CH3C3F7)2, and investigated how it affects the dynamic performance of the TFTs and how it can be effectively alleviated.

The smallest channel-width-normalized contact resistance we have so far been able to measure is 10 Ωcm.



Flexible low-voltage high-frequency organic thin-film transistors
J. W. Borchert, U. Zschieschang, F. Letzkus, M. Giorgio, R. T. Weitz, M. Caironi, J. N. Burghartz, S. Ludwigs, H. Klauk
Science Advances, vol. 6, no. 21, pp. eaaz5156/1-8, May 2020

Small contact resistance and high-frequency operation of flexible low-voltage inverted coplanar organic transistors
J. W. Borchert, B. Peng, F. Letzkus, J. N. Burghartz, P. K.L. Chan, K. Zojer, S. Ludwigs, H. Klauk
Nature Communications, vol. 10, pp. 1119/1-11, March 2019

Nonlinear Contact Effects in Staggered Thin-Film Transistors
A. Fischer, H. Zündorf, F. Kaschura, J. Widmer, K. Leo, U. Kraft, H. Klauk
Physical Review Applied, vol. 8, pp. 054012/1-14, November 2017

Detailed analysis and contact properties of low-voltage organic thin-film transistors based on dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) and its didecyl and diphenyl derivatives
U. Kraft, K. Takimiya, M. J. Kang, R. Rödel, F. Letzkus, J. N. Burghartz, E. Weber, H. Klauk
Organic Electronics, vol. 35, pp. 33-40, May 2016

Low-voltage organic transistors based on tetraceno[2,3-b]thiophene: Contact resistance and air stability
U. Kraft, J. E. Anthony, E. Ripaud, M. A. Loth, E. Weber, H. Klauk
Chemistry of Materials, vol. 27, no. 3, pp. 998-1004, February 2015

Contact properties of high-mobility, air-stable, low-voltage organic n-channel thin-film transistors based on a naphthalene tetracarboxylic diimide
R. Rödel, F. Letzkus, T. Zaki, J. N. Burghartz, U. Kraft, U. Zschieschang, K. Kern, H. Klauk
Applied Physics Letters, vol. 102, no. 23, pp. 233303/1-5, June 2013

Contact Resistance and Megahertz Operation of Aggressively Scaled Organic Transistors
F. Ante, D. Kälblein, T. Zaki, U. Zschieschang, K. Takimiya, M. Ikeda, T. Sekitani, T. Someya, J. N. Burghartz, K. Kern, H. Klauk
Small, vol. 8, no. 1, pp. 73-79, January 2012

Contact Doping and Ultrathin Gate Dielectrics for Nanoscale Organic Thin-Film Transistors
F. Ante, D. Kälblein, U. Zschieschang, T. W. Canzler, A. Werner, K. Takimiya, M. Ikeda, T. Sekitani, T. Someya, H. Klauk
Small, vol. 7, no. 9, pp. 1186-1191, May 2011


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