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Determination of P3HT Trap Site Energies by Thermally Stimulated Current

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Abstract

The thermal, electrical and morphological characterization of poly(3-hexylthiophene-2,5diyl) (P3HT) is presented and discussed. Thermal analyses revealed high glass transition, melting and degradation temperatures, indicating high stability of the polymer to annealings in the range 25–200°C. Electrical measurements were performed in spin-coated devices constructed using indium tin oxide (ITO) and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) in the sandwich structure ITO/PEDOT:PSS/P3HT/Al. The devices were thermally treated at 25°C, 100°C, 150°C, and 200°C prior to the measurements. Characteristic curves of current density versus voltage showed that the injection of charge carriers is governed by tunneling at high electric fields. Hole mobility was estimated by impedance spectroscopy, showing a maximum value of 8.6 × 10−5 cm2/Vs for annealed films at 150°C. A thermally stimulated current technique was used to analyze the trap density in the P3HT and its respective energies for all devices, presenting the lowest trap density for annealed films at 150°C. Morphological features observed by atomic force microscopy showed that the 150°C thermally treated film presents the best interface condition of the four investigated annealing temperatures.

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Authors and Affiliations

  1. Physics Axis, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, PR, 80215-901, Brazil

    J. F. P. Souza

  2. Department of Physics, Federal University of Paraná (UFPR), P. O. Box 19044, Curitiba, PR, 81531-990, Brazil

    J. P. M. Serbena

  3. Division of Electrical Systems, LACTEC Institutes, Federal University of Paraná (UFPR), P. O. Box 19067, Curitiba, PR, 81531-980, Brazil

    E. L. Kowalski

  4. Paulo Scarpa Polymer Laboratory (LaPPS), Department of Chemical, Federal University of Paraná (UFPR), P. O. Box 19081, 81531-990, Curitiba, PR, Brazil

    L. C. Akcelrud

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Souza, J.F.P., Serbena, J.P.M., Kowalski, E.L. et al. Determination of P3HT Trap Site Energies by Thermally Stimulated Current. J. Electron. Mater. 47, 1611–1619 (2018). https://doi.org/10.1007/s11664-017-5965-z

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  • DOI: https://doi.org/10.1007/s11664-017-5965-z

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