ELECTRONIC-STRUCTURE OF POLYPYRROLE FILMS

被引:92
作者
BATZ, P
SCHMEISSER, D
GOPEL, W
机构
[1] Institut F̈r Theoretische und Physikalische Chemie, T̈bingen
关键词
D O I
10.1103/PhysRevB.43.9178
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
引用
收藏
页码:9178 / 9189
页数:12
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