Investigation of polarization effects in organic thin films by surface core-level shifts

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M. B. Casu, Y. Zou, S. Kera, D. Batchelor, Th. Schmidt, and E. Umbach
Universität Würzburg, Experimentelle Physik II, Am Hubland, D-97074 Würzburg, Germany

Received 21 September 2007; published 26 November 2007

Westudy charge delocalization and polarization effects in organic thin filmsby comparing surface- and bulk-sensitive, high-resolution C 1s photoemission data usingtunable synchrotron radiation. In three cases, perylene-tetracarboxylicacid-dianhydride, coronene, and metal-freephthalocyanine, no surface core level shifts are observed (upper limit100 meV). This unexpected finding shows that polarization effects, and hencepolarization differences between surface and bulk, are rather small, andimplies that the effective charge is not localized on thecore-ionized molecule but delocalized over several neighboring molecules.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.76.193311
DOI:	10.1103/PhysRevB.76.193311
PACS:	79.60.-i; 71.20.Rv; 73.20.Jc; 73.61.-r 79.60.-i Photoemission and photoelectron spectra (condensed matter) 71.20.Rv Electronic structure of polymers and organic compounds 73.20.Jc Delocalization processes (surface/interface states) 73.61.-r Electrical properties of specific thin films YEAR: 2007
KEYWORDS:	core levels, organic compounds, photoelectron spectra, surface states, thin films

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