skip to main content

SciTech ConnectSciTech Connect

Title: Impact of potassium doping on the electronic structure of tetracene and pentacene: An electron energy-loss study

We report the doping induced changes of the electronic structure of tetracene and pentacene probed by electron energy-loss spectroscopy in transmission. A comparison between the dynamic response of undoped and potassium-intercalated tetracene and pentacene emphasizes the appearance of a new excitation feature in the former gap upon potassium addition. Interestingly, the momentum dependency of this new excitation shows a negative dispersion. Moreover, the analysis of the C 1s and K 2p core-level excitation results in a significantly lower doping level compared to potassium doped picene, a recently discovered superconductor. Therefore, the present electronic structure investigations open a new pathway to better understand the exceptional differences between acenes and phenacene and their divergent behavior upon alkali doping.
Authors:
 [1] ;  [2]
  1. Center for Free-Electron Laser Science / DESY, Notkestraße 85, D-22607 Hamburg (Germany)
  2. IFW Dresden, P.O. Box 270116, D-01171 Dresden (Germany)
Publication Date:
OSTI Identifier:
22493138
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 143; Journal Issue: 15; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CLATHRATES; COMPARATIVE EVALUATIONS; DISPERSIONS; DOPED MATERIALS; ELECTRONIC STRUCTURE; ELECTRONS; ENERGY LOSSES; ENERGY-LOSS SPECTROSCOPY; EXCITATION; PENTACENE; POTASSIUM; SUPERCONDUCTORS; TETRACENE