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Electrical properties of doped 3-tetradecylpolypyrrole/metal devices

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Abstract

The electrical properties of devices made of doped 3-tetradecylpolypyrrole (PPy-C14) thin films sandwiched between indium-tin-oxyde (ITO) and gold metal electrodes are reported. The current density–voltage (J–V) curves are asymmetric and nonlinear implying a non Ohmic rectifying contact. Using standard thermionic emission theory (Schottky) J–V characteristics were satisfactorily fitted with a saturation current of J0=1.5×10-5 A cm-2, a barrier height of ϕb=0.7 eV, and an ideality factor of n=5.3. Characteristics from the plot of J–V versus 1/T show that the activation energy of the thermionic emission process is higher below the glass transition temperature of PPy-C14 (Tg=45 °C) than above, which seems to indicate that the hopping conduction process is enhanced at T>Tg. The carrier concentration has been calculated from capacitance–voltage (C-V) measurements (N=1.9×1017 cm-3) allowing estimation of the carrier mobility μ=2.6×10-2 cm2 V-1 s-1.

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Authors and Affiliations

  1. Laboratoire de Thermophysique de la Matière Condensée, UMR CNRS 8024, MREI, Université du Littoral-Côte d’Opale, 59140, Dunkerque, France

    M. Boussoualem, J.M. Buisine & F. Roussel

  2. Science Division, University of Science and Arts of Oklahoma, Chickasha, OK, 73018, USA

    R.C.Y. King

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  1. M. Boussoualem
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  2. R.C.Y. King
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  3. J.M. Buisine
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  4. F. Roussel
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Correspondence to F. Roussel.

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PACS

73.61.Ph; 73.40.Sx; 73.30.+y

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Boussoualem, M., King, R., Buisine, J. et al. Electrical properties of doped 3-tetradecylpolypyrrole/metal devices. Appl. Phys. A 81, 773–777 (2005). https://doi.org/10.1007/s00339-004-2743-6

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  • DOI: https://doi.org/10.1007/s00339-004-2743-6

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