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Evidence for efficient screening in organic materials
Author(s) -
Casu M. B.
Publication year - 2008
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.200701270
Subject(s) - coronene , spectral line , materials science , chemistry , chemical physics , nanotechnology , molecule , physics , organic chemistry , astronomy
Abstract We present highly resolved X‐ray photoemission measurements performed in order to investigate surface core level shifts (SCLS) on various different organic systems: PTCDA, coronene, and metal free phthalocyanine. C 1s spectra evidence the absence of SCLS in organic thin films. We explained these results in terms of very efficient screening. If the molecular interaction is sufficiently strong, the screening of the created charge by delocalisation is quite efficient. SCLS absence in organic materials implies that polarisation energies are much lower than usually assumed. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)