Bis(phthalocyaninato)yttrium grown on Au(111): Electronic structure of a single molecule and the stability of two-dimensional films investigated by scanning tunneling microscopy/spectroscopy at 4.8 K

Yanfeng Zhang, Pengfei Guan, Hironari Isshiki, Mingwei Chen, Masahiro Yamashita, Tadahiro Komeda

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Scanning tunneling microscopy/spectroscopy (STM/STS) at 4.8 K has been used to examine the growth of a double-decker bis(phthalocyaninato)yttrium (YPc2) molecule on a reconstructed Au(111) substrate. Local differential conductance spectra (dI/dV) of a single YPc2 molecule allow the characteristics of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) to be identified. Furthermore, lateral distributions of the local density of states (LDOS) have also been obtained by dI/dV mapping and confirmed by first principles simulations. These electronic feature mappings and theoretical calculations provide a basis for understanding the unique STM morphology of YPc2, which is usually imaged as an eight-lobed structure. In addition, we demonstrate that bias-dependent STM morphologies and simultaneous dI/dV maps can provide a way of understanding the stability of two-dimensional YPc2 films.

Original languageEnglish
Pages (from-to)604-611
Number of pages8
JournalNano Research
Volume3
Issue number8
DOIs
Publication statusPublished - 2010

Keywords

  • Scanning tunneling microscopy/spectroscopy (STM/STS)
  • electronic structure
  • phthalocyanine

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering

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