Exciton and polarization contributions to optical transition energies in an epitaxial organic monolayer on a dielectric substrate

Abstract

Optical emission and excitation spectra of the model molecule perylene-3,4,9,10-tetracarboxylic acid dianhydride adsorbed on an NaCl(100) surface were measured in the limit of isolated monomers and for two epitaxial monolayer phases (Q and HB *). Intermolecular dipole-dipole coupling and molecular polarization lead to distinct and structure-dependent relative shifts of the exciton energies with respect to the monomer. In combination with calculations of the exciton band structures, this gives insight into the relevant contributions to the transition energies for an interfacial organic film.

Adsorption‐induced changes of intramolecular optical transitions:PTCDA/NaCl and PTCDA/KCl

“…Experimental and theoretical studies suggest that the PTCDA molecule adsorbs with its long axis parallel to the [110] or [1 0] direction, the carbonyl oxygen being located above surface cations and the center of the molecule residing above a surface anion . Hence, we used this orientation as a starting point for the geometry optimization.…”

“…Experimental studies have been performed by Müller et al for the archetypal organic semiconductor perylene‐3,4,9,10‐tetracarboxylic acid dianhydride (PTCDA) adsorbed on sodium chloride NaCl(100) and potassium chloride KCl(100) surfaces. To eliminate the intermolecular interaction, they adsorbed very low concentrations of the molecule (below 1% of a monolayer) . There is a considerable number of experimental and theoretical studies on the adsorption geometry, the epitaxial growth, the structure, and optical properties of thin PTCDA films …”

Plasmonic excitation of light emission and absorption by porphyrine molecules in a scanning tunneling microscope

“…The electromagnetic interaction between molecules is affected by these parameters and may lead to shifts of the emission and absorption wavelength of the order of several nanometers. 34,35 Conclusion. The light emission properties of a metallic tunneling junction can be strongly influenced by molecules close to it.…”

Reaction kinetics of ultrathin NaCl films on Ag(001) upon electron irradiation

“…In many fundamental research fields, notably in surface science [1], they serve as model templates and atomically controlled spacers, for the manipulation and study of nanoparticles [2][3][4], molecules [5][6][7][8][9][10], or single atoms [11]. Most of the time, chemical stability of insulating thin films upon charged particle irradiation is required, e.g., for characterization using electron spectroscopy and microscopy.…”