Details

Autor(en) / Beteiligte

• Zhuo, Jing-Mei
• Zhao, Li-Hong
• Chia, Perq-Jon
• Sim, Wee-Sun
• Friend, Richard H
• Ho, Peter K H

Titel

Direct evidence for delocalization of charge carriers at the Fermi level in a doped conducting polymer

Ist Teil von

• Physical review letters, 2008-05, Vol.100 (18), p.186601-186601, Article 186601

Ort / Verlag

United States

Erscheinungsjahr

2008

Quelle

American Physical Society

Beschreibungen/Notizen

• The infrared absorption spectrum of the polaron charges at the Fermi level EF in a heavily p-doped conducting poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) film has been measured using interferogram-modulated Fourier-transform charge-modulation spectroscopy. The spectrum indicates softer phonons and weaker electron-phonon coupling riding on a strongly redshifted Drude-like electronic transition, different from the population-averaged "bulk" spectrum. This provides direct evidence that the EF holes are sufficiently delocalized even in such disordered materials to reside in an energy continuum (band states) while the rest of the hole population resides in self-localized gap states.