Investigation of Undoped and Alkali-Metal Doped Poly(p-phenylene Selenide)

  • W. Czerwiński
  • J. Fink
  • N. Nücker
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 76)

Abstract

In the last few years, conducting polymers with non-degenerate ground state and with conductivity mechanisms somewhat different from the case of transpolyacetylene have attracted strong interest. Polaron-type defects in these polymers (Polyparaphenylene (PPP), Polypyrrole (PP), Polythiophene (PT), Polyparaphenylene sulfide (PPS)) leading to the presence of quinoid structure segments, have been theoretically predicted [1] and are expected to depend on the presence of impurities [2] as well as on the chain length of the polymer [3]. Another polymer with a non-degenerate ground state is polyparaphenylene selenide (PPSe) which was investigated up to now only incidentally [4,5]. Moreover, investigations on the electronic structure of PPSe have not been reported up to date. It is known [6] that polyparaphenylene sulfide doped by strong p-dopant molecules has a rather high conductivity (∿1 S/cm). Substitution of sulfur by selenium may be favourable for high conductivity due to the increased metallic character of selenium and due to a decrease in electronegativity. Moreover, there is experimental evidence [7,8] that doped selenium compounds have higher conductivities than similar sulfur systems. However, also opposite results were reported [4]. In this contribution we have used electron energy loss spectroscopy and electron diffraction to investigate the electronic and crystal structure of undoped and doped PPSe.

Keywords

Sulfide Benzene Argon Selenium Oligomer 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • W. Czerwiński
    • 1
    • 2
  • J. Fink
    • 1
  • N. Nücker
    • 1
  1. 1.Kernforschungszentrum KarlsruheInstitut für Nukleare FestkörperphysikKarlsruheFed.Rep.of Germany
  2. 2.Institute of ChemistryUniversity N. CopernicusTorunPoland

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