Electronic structure of polypyrrole films

P. Bätz, D. Schmeisser, and W. Göpel
Phys. Rev. B 43, 9178 – Published 15 April 1991
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Abstract

Chemical and electronic properties of polypyrrole films are investigated for different doping levels using x-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy, and high-resolution electron-energy-loss spectroscopy. The XPS results give evidence for instabilities in perchlorate-doped polypyrrole films, whereas tosylate-doped samples are chemically stable. The valence-band structure of the latter is in line with the theoretically expected features of this one-dimensional polymer. Upon doping, we observe occupied states and electronic transitions in the gap. At low dopant concentrations (4%) these states are polaronic. At around 10% doping they cause a semiconductor-metal transition. The finite density of states at the Fermi energy is in accordance with polaronic bands modulated by Coulomb repulsion, as well as with a disorder-induced destabilization of the Peierls ground state.

  • Received 16 November 1990

DOI:https://doi.org/10.1103/PhysRevB.43.9178

©1991 American Physical Society

Authors & Affiliations

P. Bätz, D. Schmeisser, and W. Göpel

  • Institut für Theoretische und Physikalische Chemie, Auf der Morgenstelle 8, Tübingen, Germany

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Vol. 43, Iss. 11 — 15 April 1991

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