Journal
SYNTHETIC METALS
Volume 146, Issue 3, Pages 373-376Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2004.08.016
Keywords
organic field effect transistors; organic molecular beam deposition; hexamethyldisilazane
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Ultra-thin organic film transistors were annealed in vacuum at constant temperature and for different time intervals. This treatment eliminates unintentional doping and reduces hysteresis in I/V curves, both for pentacene and alpha-sexithienyl, without substantially improving the charge mobility. Devices that originally exhibited high and non-ohmic contact resistance never matched the characteristics of devices with well grown electrode/semiconductor interfaces, even after annealing. Prolonging the annealing time resulted in film rupture due to either re-crystallization or molecular desorption. This process started before healing of molecular disorder at the relevant interfaces could take place. (C) 2004 Elsevier B.V. All rights reserved.
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