Systematic study of the electronic states in electron-doped polyacenes

Quynh T.N. Phan, Satoshi Heguri, Yoichi Tanabe, Hidekazu Shimotani, Katsumi Tanigaki

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

High-quality polycrystalline polyacenes (PLAs) of anthracene (AN), tetracene (TN), and pentacene (PN) doped with potassium in the 1:1 and 1:2 stoichiometries are prepared and their physical properties are systematically studied by magnetic measurements. The magnetic susceptibilities as a function of temperature for Kx(PLAs) are interpreted in the framework of a band-filling model. Clear evidence for the occurrence of charge transfer from K to the organic semiconductors is provided. K1(AN) prepared by a solid-state diffusion process exhibits a pronounced magnetic hump at 140 K, which is associated with antiferromagnetic interactions ascribed to the on-site Coulomb repulsion in a Mott insulating state, whereas both K1(TN) and K1(PN) show a conventional Curie-Weiss behavior at low temperatures. We successfully demonstrate the tuning of the electronic states of PLA-type semiconductors in bulk. Comments are given about the possibility of metallic states in potassium-doped PLAs, which have recently been reported for other polycyclic aromatic hydrocarbons. We prepared K-intercalated polyacenes (PLAs) by using an improved methodology. The magnetic susceptibilities as a function of temperature for Kx(PLAs) are described in the framework of a band-filling model. We successfully tuned the electronic states of the fused-ring semiconductors in bulk.

Original languageEnglish
Pages (from-to)4033-4038
Number of pages6
JournalEuropean Journal of Inorganic Chemistry
Volume2014
Issue number24
DOIs
Publication statusPublished - 2014 Aug 1

Keywords

  • Charge transfer
  • Conducting materials
  • Hydrocarbons
  • Intercalations
  • Magnetic properties

ASJC Scopus subject areas

  • Inorganic Chemistry

Fingerprint Dive into the research topics of 'Systematic study of the electronic states in electron-doped polyacenes'. Together they form a unique fingerprint.

Cite this