Threshold voltage control of bottom-contact n-channel organic thin-film transistors using modified drain/source electrodes
- 23 February 2009
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 94 (8), 083310
- https://doi.org/10.1063/1.3090489
Abstract
Bottom-contact -channel thin-film transistors (TFTs) with drain/source electrodes modified by benzenethiol derivatives have been fabricated to investigate the influence of the modification on the transistor characteristics. Modification using methylbenzenethiol, aminobenzenethiol, and (dimethylamino)benzenethiol having electron-donating groups causes threshold voltages to shift to low voltages. In addition, the modification provides no significant decrease in saturation mobilities. A TFT with (dimethylamino)benzenethiol-modified electrodes has a low threshold voltage of 5.1 V as compared to that of 16.8 V for a TFT with nonmodified electrodes. The threshold-voltage shift is probably because the modification reduces electron-injection barrier height and improves electron injection into organic semiconductors.
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