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The evolution of ch...
The evolution of charge-induced gap states in degenerate and non-degenerate conjugated molecules and polymers as studied by photoelectron spectroscopy
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- Dannetun, Per (author)
- Groupe de Physique des Solides, Tour 23-2, place Jussieu, 752 51 Paris Cedex 05, France
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- Lögdlund, Michael (author)
- Linköpings universitet,Institutionen för fysik, kemi och biologi,Tekniska högskolan
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- Fahlman, Mats (author)
- Linköpings universitet,Institutionen för fysik, kemi och biologi,Tekniska högskolan
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- Fauquet, C. (author)
- Linköpings universitet,Institutionen för fysik, kemi och biologi,Tekniska högskolan
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- Beljonne, D. (author)
- Service de Chimie des Matériaux Nouveaux, Université de Mons-Hainaut, place du Parc 20, B-7000 Mons, Belgium
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- Brédas, J. L. (author)
- Service de Chimie des Matériaux Nouveaux, Université de Mons-Hainaut, place du Parc 20, B-7000 Mons, Belgium
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- Bässler, H. (author)
- Fachbereich Physikalische Chemie und Zentrum für Materialwissenschaften der Phillips-Universität, Hans-Meerwein-Strasse, W-3550 Marburg, Germany
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- Salaneck, William R. (author)
- Linköpings universitet,Institutionen för fysik, kemi och biologi,Tekniska högskolan
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(creator_code:org_t)
- Elsevier, 1994
- 1994
- English.
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In: Synthetic metals. - : Elsevier. - 0379-6779 .- 1879-3290. ; 67:1, s. 81-86
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Spectroscopy
- Conjugated molecules and polymers
- Gap states
Publication and Content Type
- ref (subject category)
- art (subject category)
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