Direct observation of the charge carrier concentration in organic field-effect transistors by electron spin resonance

Tanaka, Hisaaki; Watanabe, Shun-ichiro; Ito, Hiroshi; Marumoto, Kazuhiro; Kuroda, Shin-ichi
March 2009
Applied Physics Letters;3/9/2009, Vol. 94 Issue 10, pN.PAG
Academic Journal
Charge carrier concentration in operating field-effect transistor (FET) of regioregular poly(3-hexylthiophene) has been directly determined by electron spin resonance (ESR). ESR signals of field-induced polarons are observed around g=2.003 under the application of negative gate-source voltage (Vgs). Upon applying drain-source voltage (Vds), ESR intensity decreases linearly in the low Vds region, reaching to about 50% of the initial intensity at the pinch-off point (Vds≅Vgs). For larger absolute values of Vds, it becomes nearly Vds independent. These behaviors are well explained by the change in the carrier concentration obtained by the FET theory using gradual channel approximation.


Related Articles

  • Magnetic resonance studies of the low-dimensional magnet NaFe(WO4)2. Dergachev, K. G.; Kobets, M. I.; Khatsko, E. N. // Low Temperature Physics;May2005, Vol. 31 Issue 5, p402 

    Magnetic resonance studies of the low-dimensional monoclinic compound NaFe(WO4)2 are carried out in the frequency range 25–142 GHz and temperature range 1.8–300 K. The EPR data near the phase transition attest to the two-dimensionality of the magnetic structure of NaFe(WO4)2. The...

  • Distributions of self-trapped hole continuums in silica glass. Wang, R. P.; Saito, K.; Ikushima, A. J. // Journal of Applied Physics;7/1/2006, Vol. 100 Issue 1, p013706 

    Photobleaching of self-trapped holes (STH) in low temperature UV-irradiated silica glass has been investigated by the electron spin resonance method. The bleaching time dependence of the decay of two kinds of STH, STH1, and STH2, could be well fitted by the stretched exponential function, and...

  • Cu2+ ions in sodium fluoride-sodium borate glasses studied by EPR and optical absorption techniques. Prakash, P. G.; Rao, J. L. // Journal of Materials Science;Jan2004, Vol. 39 Issue 1, p193 

    Electron paramagnetic resonance (EPR) and optical absorption spectra of Cu2+ ions in 80Na2B4O7-(20 - x)NaF - xCuO (NFNB) glass system with 0 = x = 6 mol% have been studied. EPR spectra of all the glass samples exhibit resonance signals characteristic of Cu2+ ions. The values of spin-Hamiltonian...

  • FLAPW Study of the EFG Tensor at Cd Impurities in In2O3. Errico, L. A.; Rentería, M.; Fabricius, G.; Darriba, G. N. // Hyperfine Interactions;2004, Vol. 158 Issue 1-4, p63 

    We report an ab initio study of the electric-field gradient tensor (EFG) at Cd impurities located at both nonequivalent cationic sites in the semiconductor In2O3. Calculations were performed with the FLAPW method that allows us to treat the electronic structure of the doped system and the atomic...

  • Hyperfine coupling constants and electron-spin g-factors of B[sub 2][sup +], Al[sub 2][sup +], Ga[sub 2][sup +], BAl[sup +], BGa[sup +], and AlGa[sup +]: An ab initio study. Bruna, Pablo J.; Grein, Friedrich // Journal of Chemical Physics;8/1/2002, Vol. 117 Issue 5, p2103 

    The hyperfine coupling constants (hfcc) and electron-spin g-factors (magnetic moments) calculated for B[sup +][sub 2], Al[sup +][sub 2], Ga[sup +][sub 2], BAl[sup +], BGa[sup +], and AlGa[sup +] are reported. The hfcc's are obtained with single-reference configuration interaction, second-order...

  • Determination of depth profiles of E″ defects in irradiated vitreous silica by electron paramagnetic-resonance imaging. Sueki, Minoru; Austin, William R.; Zhang, Lin; Kerwin, David B.; Leisure, Robert G.; Eaton, Gareth R.; Eaton, Sandra S. // Journal of Applied Physics;1/15/1995, Vol. 77 Issue 2, p790 

    Presents a study which determined the depth profiles of E' defects in irradiated vitreous silica by electron paramagnetic resonance imaging. Comparison of the depth profiles with the spatial distribution of the energy deposition; Experimental details; Results and discussion.

  • Theory of the Spin-Polaron for 2D Antiferromagnets. Barabanov, A. F.; Maksimov, L.A.; Mikheyenkov, A. V. // AIP Conference Proceedings;2000, Vol. 527 Issue 1, p1 

    The aim of these lectures is to describe theoretical ideas concerning spin-polaron scenario for the charged excitations in a two-dimensional antiferromagnet in normal state. The distinctive feature of our approach consists in treating a local polaron (not a bare hole) as a zero approximation for...

  • Magnetopolaron State of Particles in Quantum Rings of Finite Width. Kovalev, V. M.; Chaplik, A. V. // Journal of Experimental & Theoretical Physics;Oct2005, Vol. 101 Issue 4, p686 

    The energies of the electron and hole weak-coupling polarons are determined in quantum rings of finite width in a uniform magnetic field. It is shown that polaron corrections exhibit oscillatory behavior as a function of a magnetic field. The effect of polaron corrections on the absorption and...

  • Vibron-polaron critical localization in a finite size molecular nanowire. Falvo, C.; Pouthier, V. // Journal of Chemical Physics;1/1/2005, Vol. 122 Issue 1, p014701 

    The small polaron theory is applied to describe the vibron dynamics in an adsorbed nanowire with a special emphasis onto finite size effects. It is shown that the finite size of the nanowire discriminates between side molecules and core molecules which experience a different dressing mechanism....


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics