Electronic excitation spectrum of doped organic thin films investigated using electron energy-loss spectroscopy

Abstract

The electronic excitation spectra of undoped, and potassium as well as calcium doped phenantrene-type hydrocarbons have been investigated using electron energy-loss spectroscopy (EELS) in transmission. In the undoped materials, the lowest energy excitations are excitons with a relatively high binding energy. These excitons also are rather localized as revealed by their vanishing dispersion. Upon doping, new low energy excitation features appear in the former gaps of the materials under investigation. In K${}_3$picene and K${}_3$chrysene they are characterized by a negative dispersion while in Ca${}_3$picene they are dispersionless.

References in corpus (11)

• Electronic transport through electron-doped Metal-Phthalocyanine Materials
• Electronic Correlation effects in superconducting picene from ab-initio calculations
• Electron Energy-Loss Spectroscopy: A versatile tool for the investigations of plasmonic excitations
• Density functional calculations of the electronic structure and magnetic properties of the hydrocarbon K3picene superconductor near the metal-insulator transition
• Absence of photoemission from the Fermi level in potassium intercalated picene and coronene films: structure, polaron or correlation physics?
• Momentum dependence of the excitons in pentacene
• Electronic properties of molecular solids: the peculiar case of solid Picene
• Exciton character in picene molecular solids
• Dynamic response and electronic structure of potassium doped picene investigated by electron energy-loss spectroscopy
• Crystal structure search and electronic properties of alkali doped phenanthrene and picene
• Challenging the nature of low energy plasmon excitations in CaC${}_6$ using electron energy-loss spectroscopy