Low-temperature scanning tunneling microscopy investigation of tris(phthalocyaninato)yttrium triple-decker molecules deposited on Au(111)

Hironari Isshiki, Jie Liu, Keiichi Katoh, Masahiro Yamashita, Hitoshi Miyasaka, Brian K. Breedlove, Shinya Takaishi, Tadahiro Komeda

Research output: Contribution to journalArticlepeer-review

Abstract

We have executed scanning tunneling microscopy (STM) observation of triple-decker Y2Pc3 molecules deposited on a Au(111) surface. It is shown that the triple-decker phthalocyanine molecule, tris(phthalocyaninato)yttrium, can be successfully transferred to the Au(111) surface by a sublimation method under an ultra high vacuum condition. A monolayer film of Y2Pc3 was observed with a height of ∼0.55nm from the bare Au(111) surface. The molecules were adsorbed with a flat-lying configuration and a pseudosquare lattice was formed. We propose a temporal model of the lattice with two unit vectors a and b, where a is parallel to the [11̄0] direction with a length of 5a [a is the nearest-neighbor distance of the Au(111)] and b is parallel to the [112̄] direction with a length of 3√3a. Inside each molecule, eight-lobe bright protrusions were observed in occupied-state images, which correspond to the high-density-of- states (DOS) area on both sides of the four phenyl rings in the top phthalocyanine (Pc). Scanning tunneling spectroscopy (STS) observation showed that the HOMO and LUMO levels are at the ligand position and the metalcenter position, indicating a small contribution of the metal Y to the DOS of the top layer.

Original languageEnglish
Article number08LB11
JournalJapanese journal of applied physics
Volume49
Issue number8 PART 4
DOIs
Publication statusPublished - 2010 Aug 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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