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The evolution of charge-induced gap states in degenerate and non-degenerate conjugated molecules and polymers as studied by photoelectron spectroscopy
Groupe de Physique des Solides, Tour 23-2, place Jussieu, 752 51 Paris Cedex 05, France.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-9879-3915
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
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1994 (English)In: Synthetic metals, ISSN 0379-6779, E-ISSN 1879-3290, Vol. 67, no 1, 81-86 p.Article in journal (Refereed) PublishedText
Abstract [en]

We report the results of ultraviolet photoelectron spectroscopy (UPS) studies of the interaction between sodium and conjugated systems for a series of diphenylpolyees and diffrent oligomers of poly(p-phenylenevinylene) (PPV). The diphenylpolyenes include molecules containing two (i.e., stilbene) to 14 carbon atoms in the polyene part; stilbene itself can also be considered as a phenyl-capped monomer of PPV. Furthermore, a PPV oligomer with three phenylene units, as well as PPV itself, has been studied. The experimental results are interpreted with the help of quantum-chemical calculations using the Hartree-Fock semi-empirical Austin Model 1 (AM1) and valence-effective Hamiltonian (VEH) methods. An important result is that all the systems react strongly with sodium; at high doping levels two new doping-induced states are detected above the valence band edge of the pristine material. In the case of saturation-doped diphenylpolyenes (i.e., two sodiums per molecule), the new states can be discussed in terms of soliton-antisoliton pairs confined within the polyene part of the molecules; in contrast, the self-localized states induced in PPV and its oligomers have to be referred to as bipolarons.

Place, publisher, year, edition, pages
Elsevier, 1994. Vol. 67, no 1, 81-86 p.
Keyword [en]
Spectroscopy, Conjugated molecules and polymers, Gap states
National Category
Chemical Sciences Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-124173DOI: 10.1016/0379-6779(94)90015-9ISI: A1994PW12000013OAI: oai:DiVA.org:liu-124173DiVA: diva2:896160
Conference
Symposium D on Organic Materials for Electronics - Polymer Interfaces with Metals and Semiconductors, at the 1994 E-MRS Spring Conference, Strasbourg, France, May 24-27, 1994
Available from: 2016-01-20 Created: 2016-01-20 Last updated: 2016-02-02Bibliographically approved

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Dannetun, PerLögdlund, MichaelFahlman, MatsSalaneck, William R.
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Department of Physics, Chemistry and BiologyThe Institute of Technology
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