Effect of end-substitutions of distyryl-oligothiophenes by hexyl chains on environmental stability in organic thin film transistors

In this study, solution and solid-state properties as well as the organic thin film transistor (OTFT) behaviour of two α,ω-hexyl-distyryl-oligothiophenes ( DH-DS nT , n = 2, 4) are presented. The optical and electrochemical properties of the oligomers in solution were investigated by UV–vis absorpti...

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Bibliographic Details
Published in:	Organic electronics Vol. 9; no. 5; pp. 591 - 601
Main Authors:	Videlot-Ackermann, C., Brisset, H., Ackermann, J., Zhang, J., Raynal, P., Fages, F., Mehl, G.H., Tnanisawa, T., Yoshimoto, N.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 01-10-2008 Elsevier
Subjects:	Analytical chemistry Applied sciences Chemistry Condensed matter: electronic structure, electrical, magnetic, and optical properties Electrochemical methods Electronics Exact sciences and technology Oligothiophene derivative Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Organic semiconductor Organic thin film transistor Photoluminescence Physics Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Stability Transistors 85.30.Tv Organic thin film transistor Stability 33.15.−e 06.30.Ft Oligothiophene derivative 72.80.Le Organic semiconductor Voltage threshold Atomic force microscopy Photoluminescence Oligomer Liquid crystals High vacuum Thin film Cyclic voltammetry Optical microscopy p type semiconductor Optical properties 33.15.-e Optical characteristic Organic semiconductors Optical absorption Organic electronics Differential scanning calorimetry Hole mobility X ray diffraction Absorption spectrum Solid state Absorption spectrometry Electrochemical properties Ultraviolet spectrum Thin film transistor Vacuum deposition
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Summary:	In this study, solution and solid-state properties as well as the organic thin film transistor (OTFT) behaviour of two α,ω-hexyl-distyryl-oligothiophenes ( DH-DS nT , n = 2, 4) are presented. The optical and electrochemical properties of the oligomers in solution were investigated by UV–vis absorption and photoluminescence spectroscopies, and cyclic voltammetry. Liquid crystal properties were studied by differential scanning calorimetry (DSC) and optical polarising microscopy (OPM). High-vacuum evaporated thin films were studied by optical absorption, X-ray diffraction and atomic force microscopy (AFM), and implemented as p-type semiconducting layers into organic thin film transistors (OTFTs). The results are investigated to study the influence of alkyl chains on the α,ω-end positions of the distyryl-oligothiophene skeleton ( DS nT ). Furthermore, detailed shelf-live tests of hole mobility ( μ), threshold voltage ( V t), on current ( I ON) and off current ( I OFF) under atmospheric conditions (air, temperature) of OTFTs based on DS4T and DH-DS4T show that the presence of alkyl chains in α,ω-end positions of distyryl-oligothiophenes is detrimental to the environmental stability of OTFTs over time.
ISSN:	1566-1199 1878-5530
DOI:	10.1016/j.orgel.2008.03.007