Band gap and charge carrier wavefunction in organic semiconductors

Martin Knupfer; H. Peisert; T. Schwieger; Joerg Fink; Denis Fichou

doi:10.1117/12.451467

21 December 2001 Band gap and charge carrier wavefunction in organic semiconductors

Martin Knupfer, H. Peisert, T. Schwieger, Joerg Fink, Denis Fichou

Proceedings Volume 4466, Organic Field Effect Transistors; (2001) https://doi.org/10.1117/12.451467
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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.

Citation Download Citation

Martin Knupfer, H. Peisert, T. Schwieger, Joerg Fink, and Denis Fichou "Band gap and charge carrier wavefunction in organic semiconductors", Proc. SPIE 4466, Organic Field Effect Transistors, (21 December 2001); https://doi.org/10.1117/12.451467

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