Raman polarization studies of highly oriented organic thin films

Presser, Volker; Schuster, Britt‐Elfriede; Casu, Maria Benedetta; Heinemeyer, U.; Schreiber, Frank; Nickel, Klaus G.; Chassé, Thomas

doi:10.1002/jrs.2361

Cited by 21 publications

(16 citation statements)

References 35 publications

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“…The tip-enhanced Raman bands [ Fig. 3(a) IV] at 1291, 1401, 1466, and 1615 cm À1 correspond to far-field measured and calculated breathing modes of DIP within deviations of a few cm À1 [13,14]. Crystalline DIP films exhibit strongly uniaxial anisotropic properties with the largest component of the dielectric tensor along a direction inclinated by approx.…”

mentioning

confidence: 80%

Nanoscale Spectroscopic Imaging of Organic Semiconductor Films by Plasmon-Polariton Coupling

et al. 2010

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Tip-enhanced near-field optical images and correlated topographic images of an organic semiconductor film (diindenoperylene, DIP) on Si have been recorded with high optical contrast and high spatial resolution (17 nm) using a parabolic mirror with a high numerical aperture for tip illumination and signal collection. The DIP molecular domain boundaries being one to four molecular layers (1.5-6 nm) high are resolved topographically by a shear-force scanning tip and optically by simultaneously recording the 6x10{5} times enhanced photoluminescence (PL). The excitation is 4x10{4} times enhanced and the intrinsically weak PL-yield of the DIP-film is 15-fold enhanced by the tip. The Raman spectra indicate an upright orientation of the DIP molecules. The enhanced PL contrast results from the local film morphology via stronger coupling between the tip plasmon and the exciton-polariton in the DIP film.

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confidence: 80%

Nanoscale Spectroscopic Imaging of Organic Semiconductor Films by Plasmon-Polariton Coupling

et al. 2010

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“…The first studies regarding polarized Raman spectroscopy began in 1964 when Loudon presented a Raman tensor analysis theory under the form of Raman scattering tensors for each of the 32 crystal classes 12 . Later, this theory was applied for crystallographic orientation analysis of inorganic 13–16 and organic single crystals 17,18 , as well as inorganic crystals present in biological systems like calcite crystals in tergite exocuticles 19 . Raman tensor analysis theory was also developed and applied for the study of complex biomolecular crystals, including nucleobases in the nucleic acid of DNA 20,21 , nucleosides 22,23 , antihuman immunodeficiency virus agents 24 , amino acids and peptides 17,25–27 .…”

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confidence: 99%

Fast and quantitative 2D and 3D orientation mapping using Raman microscopy

et al. 2019

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Non-destructive orientation mapping is an important characterization tool in materials science and geoscience for understanding and/or improving material properties based on their grain structure. Confocal Raman microscopy is a powerful non-destructive technique for chemical mapping of organic and inorganic materials. Here we demonstrate orientation mapping by means of Polarized Raman Microscopy (PRM). While the concept that PRM is sensitive to orientation changes is known, to our knowledge, an actual quantitative orientation mapping has never been presented before. Using a concept of ambiguity-free orientation determination analysis, we present fast and quantitative single-acquisition Raman-based orientation mapping by simultaneous registration of multiple Raman scattering spectra obtained at different polarizations. We demonstrate applications of this approach for two- and three-dimensional orientation mapping of a multigrain semiconductor, a pharmaceutical tablet formulation and a polycrystalline sapphire sample. This technique can potentially move traditional X-ray and electron diffraction type experiments into conventional optical laboratories.

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“…In order to access this hypothesis, we carried out a detailed study of the preferential grain orientation for pentacene grown on bare silicon oxide and for pentacene deposited on the different SAMPs. This information can be gathered via polarized Raman spectroscopy . Different scattering intensities can be observed for pentacene depending on the geometry of the Raman tensor, and the scattering geometry because the Raman intensity can be described as a function of the crystal orientation, the scattering geometry, that is, excitation and scattered polarizations, respectively.…”

Section: Resultsmentioning

confidence: 99%

Surface‐directed molecular assembly of pentacene on aromatic organophosphonate self‐assembled monolayers explored by polarized Raman spectroscopy

Yazji

Westermeier

Weinbrenner

et al. 2016

J. Raman Spectrosc.

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Organophosphonate self-assembled monolayers (SAMPs) fabricated on SiO2 surfaces can influence crystallization of vapor-deposited pentacene and thus can affect device performance of pentacene-based organic thin film transistors. Polarized Raman spectroscopy is demonstrated to be an effective technique to determine the degree of anisotropy in pentacene thin films deposited on three structurally different, aromatic SAMPs grown on silicon oxide dielectrics. Vibrational characterization of pentacene molecules in these films reveals that the molecular orientation of adjacent crystalline grains is strongly correlated on the SAMP-modified dielectric surface, which results in enhanced interconnectivity between the crystallite domains, well beyond the size of a single grain. It is found that vibrational coupling interactions, relaxation energies, and grain size boundaries in pentacene thin films vary with the choice of SAMP. This information clearly shows that molecular assembly of pentacene thin films can be modulated by controlling the SAMP-modified dielectric surface, with potentially beneficial effects on the optimization of electron transfer rate

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Raman polarization studies of highly oriented organic thin films

Cited by 21 publications

References 35 publications

Nanoscale Spectroscopic Imaging of Organic Semiconductor Films by Plasmon-Polariton Coupling

Nanoscale Spectroscopic Imaging of Organic Semiconductor Films by Plasmon-Polariton Coupling

Fast and quantitative 2D and 3D orientation mapping using Raman microscopy

Surface‐directed molecular assembly of pentacene on aromatic organophosphonate self‐assembled monolayers explored by polarized Raman spectroscopy

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