Fluorine substitution of hexa-peri-hexabenzocoronene: Change in growth mode and electronic structure

Shiro Entani, Toshihiko Kaji, Susumu Ikeda, Tomohiko Mori, Yoshihiro Kikuzawa, Hisato Takeuchi, Koichiro Saiki

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

We have studied the effect of fluorine substitution on growth mode and electronic structure of hexa-peri-hexabenzocoronene (C42H 18, HBC). Fluorinated-HBC, 2,5,8,11,14,17-hexafluoro-hexa-peri- hexabenzoeoronene (C42F6H12, 6F-HBC), grew epitaxially on a Cu(111) single-crystal surface, similar to HBC. Higher crystalline films with rather flat surfaces were obtained for 6F-HBC than for HBC due to the attractive intermolecular C-H ⋯ F-C interaction. Electron spectroscopy measurements of HBC and 6F-HBC films indicated that fluorination causes energy shifts of molecular orbitals to higher binding energies and increase of the work function. Thickness dependence spectroscopic measurements revealed that the interface dipole and the ionization potential are drastically increased in 6F-HBC/Cu(111), which is favorable for n-type electric conduction through the decrease of electron injection barrier to LUMO.

Original languageEnglish
Pages (from-to)6202-6207
Number of pages6
JournalJournal of Physical Chemistry C
Volume113
Issue number15
DOIs
Publication statusPublished - 2009 Apr 16
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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