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MAPLE-deposited polymer films for improved organic device performance

Applied Physics A volume 105, pages 547–554 (2011)Cite this article

Abstract

Matrix-assisted pulsed-laser evaporation (MAPLE) provides a mechanism for layer-by-layer growth to control the polymer–dielectric interface in organic metal–insulator–semiconductor (MIS) diodes and field-effect transistors (FETs). MAPLE-deposited copolymers of polyfluorene (PF) and polythiophene maintain their structural and optical properties, as determined by Raman spectroscopy, absorption, and photoluminescence. These films are further utilized in MIS and FET structures with SiO2 and other polymer dielectrics. Since common polymer dielectrics prevent spin coating of solution processable polymers due to solubility effects, MAPLE is one of the only deposition techniques for investigating all polymer semiconductor-insulator interfaces. In this paper we present optical and electrical studies of MAPLE-deposited PF and polythiophene films in FETs and MIS structures. The FET carrier mobilities of these devices compare well with spin-coated devices. Capacitance–voltage and conductance–voltage from MIS structures with MAPLE-deposited PF copolymer films yield interface trap densities in the low 1012 eV−1 cm−2 range.

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Authors and Affiliations

  1. Department of Physics and Astronomy, University of Missouri-Columbia, Columbia, MO, 65211, USA

    S. Guha, D. Adil & N. B. Ukah

  2. Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO, 65897, USA

    R. K. Gupta & K. Ghosh

Authors
  1. S. Guha
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  2. D. Adil
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  3. N. B. Ukah
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  4. R. K. Gupta
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  5. K. Ghosh
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Correspondence to S. Guha.

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Guha, S., Adil, D., Ukah, N.B. et al. MAPLE-deposited polymer films for improved organic device performance. Appl. Phys. A 105, 547–554 (2011). https://doi.org/10.1007/s00339-011-6596-5

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  • DOI: https://doi.org/10.1007/s00339-011-6596-5

Keywords

  • PMMA
  • Pentacene
  • Gate Bias
  • Interface Trap
  • Polymer Dielectric