TY - JOUR
T1 - Experimental and theoretical studies of the electronic structure of Na-doped poly (para-phenylenevinylene)
AU - Fahlman, M.
AU - Beljonne, D.
AU - Lögdlund, M.
AU - Friend, R. H.
AU - Holmes, A. B.
AU - Brédas, J. L.
AU - Salaneck, W. R.
N1 - Funding Information:
The Linkiiping-Mons and Mom-Cambridge collaborations are supported by the Commission of the European Community, within the SCIENCE program (project 0661 POLYSURF) and the BRITE/ EURAM programme (project 0148 NAPOLEO), respectively. Research on conjugated polymers in Lintiping is supported in general by grants from the Swedish Natural Sciences Research Council (NFR), the Swedish National Technical Research Board (TFR), the Swedish National Board for Industrial and Technical Development (NUTEK), and the Neste Corp., Finland. Research in Mons is partly supported by the Belgian Government “P81e d’Attraction en Chimie Supramoleculaire et Catalyse”, the SPPS “Programme d’Impulsion en Technologie de 1’Information (contract IT/SC/22)“, and FNRS. One of us (DB) is grateful to the Belgium “Institut pour l’encouragement de la Recherche dans l’Indus-trie et l’Agriculture (IRSIA)” for a Ph.D. grant. we also thank P. Dannetun, M.J. Winokur, P.L. Bum, R. Jackson and D.D.C. Bradley for fruitful discussions.
PY - 1993/11/5
Y1 - 1993/11/5
N2 - The electronic structure of sodium-doped poly (p-phenylenevinylene), or PPV, has been studied using photoelectron spectroscopy, UPS and XPS. Upon doping, two new states are created in the previously forbidden electronic bandgap. No finite density- of-states is observed at the Fermi energy. The UPS spectra are analysed with the help of VEH-level quantum chemical calculations. It is determined that the Na-doping of PPV results in the formation of bipolaron bands in the otherwise forbidden energy gap at saturation doping. These results are in contrast with the case of poly-hexyl-thiophene doped from NOPF6, where the existence of a finite density-of-states at EF and a stable polaron lattice was observed at saturation doping at room temperature. This work represents the first direct measure of multiple, resolved gap states in a doped conjugated polymer.
AB - The electronic structure of sodium-doped poly (p-phenylenevinylene), or PPV, has been studied using photoelectron spectroscopy, UPS and XPS. Upon doping, two new states are created in the previously forbidden electronic bandgap. No finite density- of-states is observed at the Fermi energy. The UPS spectra are analysed with the help of VEH-level quantum chemical calculations. It is determined that the Na-doping of PPV results in the formation of bipolaron bands in the otherwise forbidden energy gap at saturation doping. These results are in contrast with the case of poly-hexyl-thiophene doped from NOPF6, where the existence of a finite density-of-states at EF and a stable polaron lattice was observed at saturation doping at room temperature. This work represents the first direct measure of multiple, resolved gap states in a doped conjugated polymer.
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U2 - 10.1016/0009-2614(93)85644-4
DO - 10.1016/0009-2614(93)85644-4
M3 - Article
AN - SCOPUS:43949168025
VL - 214
SP - 327
EP - 332
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
IS - 3-4
ER -