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Experimental and theoretical studies of the electronic structure of Na-doped poly (para-phenylenevinylene)

✍ Scribed by M. Fahlman; D. Beljonne; M. Lögdlund; R.H. Friend; A.B. Holmes; J.L. Brédas; W.R. Salaneck

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 583 KB
Volume: 214
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)85644-4

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✦ Synopsis

The electronic structure of sodium-doped poly(pphenylenevinylene), 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 densityof-states is observed at the Fetmi energy. The UPS spectra are analysed with the help of VBH-level quantum chemical calculations. It is determined that the Nadoping 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 NOPFs, 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 fmt direct measure of multiple, resolved gap states in a doped conjugated polymer.

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