Observation of Frenkel and charge transfer excitons in pentacene single crystals using spectroscopic generalized ellipsometry

Dongchen Qi, Haibin Su, M. Bastjan, O. D. Jurchescu, T. M. Palstra, Andrew T.S. Wee, M. Rübhausen, A. Rusydi*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
33 Downloads (Pure)

Abstract

We report on the emerging and admixture of Frenkel and charge transfer (CT) excitons near the absorption onset in pentacene single crystals. Using high energy-resolution spectroscopic generalized ellipsometry with in-plane polarization dependence, the excitonic nature of three lowest lying excitations is discussed. Their distinct polarization dependence strongly indicates the presence of both Frenkel and CT types of excitons near the excitation onset. In particular, the peculiar polarization behavior of the second excitation can only be rationalized by taking into account the inherent CT transition dipole moment. This observation has important implications for the pentacene-based optoelectronic devices.

Original languageEnglish
Article number113303
JournalApplied physics letters
Volume103
Issue number11
DOIs
Publication statusPublished - 9 Sep 2013
Externally publishedYes

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