The authors report on the ultraviolet (UV)-enhanced device properties in pentacene-based thin-film transistors (TFTs). Pentacene TFTs showed a degraded mobility and lowered saturation current after illumination by a high energy UV with 254 nm wavelength. However, under 364 nm UV these devices surprisingly displayed enhanced saturation current and also showed threshold voltage shift toward lower values, maintaining their mobilities. The saturation current increase and threshold voltage shift were further related to the negative fixed charges excessively formed at the pentacene/dielectric interface by the low energy UV. The authors thus conclude that a low energy UV could rather enhance the pentacene TFT performances and also control the threshold voltage of the device. (c) 2007 American Institute of Physics.
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Univ Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USAUniv Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA
He, Zhengran
Xiao, Kai
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Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USAUniv Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA
Xiao, Kai
Durant, William
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Univ Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USAUniv Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA
Durant, William
Hensley, Dale K.
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Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USAUniv Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA
Hensley, Dale K.
Anthony, John E.
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Univ Kentucky, Dept Chem, Lexington, KY 40506 USAUniv Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA
Anthony, John E.
Hong, Kunlun
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Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USAUniv Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA
Hong, Kunlun
Kilbey, S. Michael, II
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Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
Univ Tennessee, Dept Chem, Knoxville, TN 37996 USAUniv Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA
Kilbey, S. Michael, II
Chen, Jihua
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Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USAUniv Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA
Chen, Jihua
Li, Dawen
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Univ Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USAUniv Alabama, Dept Elect & Comp Engn, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA