American Chemical Society
Browse
ja045124g_si_001.pdf (59.65 kB)
Download file

Organic Thin-Film Transistors Based on Carbonyl-Functionalized Quaterthiophenes:  High Mobility N-Channel Semiconductors and Ambipolar Transport

Download (59.65 kB)
journal contribution
posted on 2005-02-09, 00:00 authored by Myung-Han Yoon, Sara A. DiBenedetto, Antonio Facchetti, Tobin J. Marks
New carbonyl-functionalized quaterthiophenes, 5, 5‘ ‘‘-diheptanoyl-2,2‘:5‘,2‘ ‘:5‘ ‘,2‘ ‘‘-quaterthiophene (DHCO-4T), 5, 5‘ ‘‘-diperfluorohexylcarbonyl-2,2‘:5‘,2‘ ‘:5‘ ‘,2‘ ‘‘-quaterthiophene (DFHCO-4T), and 2,7-[bis-(5-perfluorohexylcarbonylthien-2-yl)]-4H-cyclopenta[2,1-b:3,4-b‘]-dithiophen-4-one (DFHCO-4TCO) have been synthesized and characterized. Field-effect transistors fabricated with these materials exhibit high electron mobilities both in a vacuum (up to 0.6 cm2 V-1 s-1) and in air (up to 0.02 cm2 V-1 s-1) and very high Ion:Ioff currents ratios (>107). DHCO-4T is the first organic material exhibiting excellent ambipolar transport (μeh up to 0.1/0.01 cm2 V-1 s-1, (Ion:Ioff)e/(Ion:Ioff)h up to 107/108 for the same device) over a broad range of deposition temperatures. These materials are therefore promising for organic complementary circuits.

History