Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 13, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3106053
Keywords
crystal microstructure; organic semiconductors; Raman spectra; semiconductor thin films; vibrational modes
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Funding
- Agence Nationale de la Recherche [ORGAPIX ANR-05-BLAN-008-02]
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We report on polarized micro-Raman spectroscopy study of two pentacene thin films exhibiting different microstructures: a well-ordered sample and a more disordered one. We have investigated the frequency range of the intramolecular C-H bending modes in the plane of the pentacene molecule and proposed an interpretation of the Raman spectra. The use of symmetry properties of the two intramolecular (uncoupled) modes allowed us to unambiguously identify it among the five main contributions observed in this spectral range. The three other modes were assumed to be resulting from molecular coupling effect owing to their different behavior upon the samples microstructure.
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