High-speed organic single-crystal transistors gated with short-channel air gaps: Efficient hole and electron injection in organic semiconductor crystals

Abstract Short-channel, high-mobility organic filed-effect transistors (OFETs) are developed based on single crystals gated with short-channel air gaps. The high hole mobility of 10 cm 2 /Vs for rubrene, and high electron mobility of 4 cm 2 /Vs for PDIF-CN 2 crystals are demonstrated even with a short channel length of 6 μm. Such performance is due to low contact resistance in these devices estimated to be as low as ∼0.5 kΩ cm at gate voltage of −4 V for rubrene. With the benefit of the short channel length of 4.5 μm in a new device architecture with less parasitic capacitance, the cutoff frequency of the rubrene air–gap device was estimated to be as high as 25 MHz for drain voltage of −15 V, which is the fastest reported for p-type OFETs, operating in ambient conditions.

[1]  I. Hulea,et al.  Bias-dependent contact resistance in rubrene single-crystal field-effect transistors , 2007, cond-mat/0703029.

[2]  Ulrich Kunze,et al.  Improved morphology and charge carrier injection in pentacene field-effect transistors with thiol-treated electrodes , 2006 .

[3]  Kazuhito Tsukagoshi,et al.  Frequency response analysis of pentacene thin-film transistors with low impedance contact by interface molecular doping , 2007 .

[4]  Kazuhito Tsukagoshi,et al.  Improvement of subthreshold current transport by contact interface modification in p-type organic field-effect transistors , 2009 .

[5]  Gerold W. Neudeck,et al.  An experimental study of the source/drain parasitic resistance effects in amorphous silicon thin film transistors , 1992 .

[6]  Masakazu Yamagishi,et al.  Patternable Solution‐Crystallized Organic Transistors with High Charge Carrier Mobility , 2011, Advanced materials.

[7]  J. Rogers,et al.  High‐Performance n‐ and p‐Type Single‐Crystal Organic Transistors with Free‐Space Gate Dielectrics , 2004 .

[8]  Zhihua Chen,et al.  High electron mobility in vacuum and ambient for PDIF-CN2 single-crystal transistors. , 2009, Journal of the American Chemical Society.

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

[10]  Paul Heremans,et al.  Organic Transistors in Optical Displays and Microelectronic Applications , 2010, Advanced materials.

[11]  Toshihiro Yamamoto,et al.  Fabrication of 5.8‐in. OTFT‐driven flexible color AMOLED display using dual protection scheme for organic semiconductor patterning , 2009 .

[12]  Barbara Stadlober,et al.  Orders‐of‐Magnitude Reduction of the Contact Resistance in Short‐Channel Hot Embossed Organic Thin Film Transistors by Oxidative Treatment of Au‐Electrodes , 2007 .

[13]  Byung-Gook Park,et al.  A study on the carrier injection mechanism of the bottom-contact pentacene thin film transistor , 2010 .

[14]  Arne Hoppe,et al.  Megahertz operation of organic field-effect transistors based on poly(3-hexylthiopene) , 2006 .

[15]  Yong-Young Noh,et al.  Downscaling of self-aligned, all-printed polymer thin-film transistors. , 2007, Nature nanotechnology.

[16]  Effects of polarized organosilane self-assembled monolayers on organic single-crystal field-effect transistors , 2004, cond-mat/0407407.

[17]  Takao Someya,et al.  Contact resistance and megahertz operation of aggressively scaled organic transistors. , 2012, Small.

[18]  J. Rogers,et al.  Interaction of organic surfaces with active species in the high-vacuum environment , 2005, cond-mat/0505370.

[19]  Yasuhiko Arakawa,et al.  High Current-Gain Cutoff Frequencies above 10 MHz in n-Channel C60 and p-Channel Pentacene Thin-Film Transistors , 2011 .

[20]  Robert A. Street,et al.  Pentacene thin film transistors on inorganic dielectrics: Morphology, structural properties, and electronic transport , 2003 .

[21]  Tobin J Marks,et al.  High-mobility air-stable n-type semiconductors with processing versatility: dicyanoperylene-3,4:9,10-bis(dicarboximides). , 2004, Angewandte Chemie.

[22]  Michael S. Shur,et al.  An experimental study of contact effects in organic thin film transistors , 2006 .

[23]  S. Fabiano,et al.  Supramolecular Order of Solution‐Processed Perylenediimide Thin Films: High‐Performance Small‐Channel n‐Type Organic Transistors , 2011 .

[24]  John A. DeFranco,et al.  Acid-sensitive semiperfluoroalkyl resorcinarene: an imaging material for organic electronics. , 2008, Journal of the American Chemical Society.

[25]  H. Matsui,et al.  Inkjet printing of single-crystal films , 2011, Nature.

[26]  Wim Dehaene,et al.  Organic RFID transponder chip with data rate compatible with electronic product coding , 2010 .

[27]  Takeo Kawase,et al.  Very high-mobility organic single-crystal transistors with in-crystal conduction channels , 2007 .

[28]  Y. Arakawa,et al.  High conductance bottom-contact pentacene thin-film transistors with gold-nickel adhesion layers , 2010 .