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Proceedings Paper

Band gap and charge carrier wavefunction in organic semiconductors
Author(s): Martin Knupfer; H. Peisert; T. Schwieger; Joerg Fink; Denis Fichou
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Paper Abstract

The performance of novel organic devices such as organic light-emitting diodes or organic field-effect transistors is intimately connected to the nature and dynamics of the charge carriers in the device components. Carrying out intercalation studies of solid model oligomers, it is experimentally demonstrated that the low lying electronic excitations in p-type doped systems are significantly confined on the individual molecules due to polaronic effects and thus deserve the name polaron excitations. These results allow for a quantitative experimental estimate of the charge carrier (polaron) extension which is of the order of 20 Angstrom . In addition, it is shown that electron correlation effects play an important role in the determination of the band gap of molecular organic semiconductors. The implications of these results for organic devices are discussed.

Paper Details

Date Published: 21 December 2001
PDF: 7 pages
Proc. SPIE 4466, Organic Field Effect Transistors, (21 December 2001); doi: 10.1117/12.451467
Show Author Affiliations
Martin Knupfer, Institut fuer Festkoerper- und Werkstofforschung Dresden (Germany)
H. Peisert, Institut fuer Festkoerper- und Werkstofforschung Dresden (Germany)
T. Schwieger, Institut fuer Festkoerper- und Werkstofforschung Dresden (Germany)
Joerg Fink, Institut fuer Festkoerper- und Werkstofforschung Dresden (Germany)
Denis Fichou, CEA Saclay and Univ. Pierre et Marie Curie (France)

Published in SPIE Proceedings Vol. 4466:
Organic Field Effect Transistors
Denis Fichou; Zhenan Bao, Editor(s)

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