Using irradiation effect to study the disparate anchoring stabilities of polar-organic molecules adsorbed on bulk and thin-film metal surfaces

Kowsalya Arumugam, Hong Ming Chen, Jing Huan Dai, Mau Fu Gao, Abhishake Goyal, Meng Kai Lin, Yasuo Nakayama, Tun Wen Pi, Sebastian Metz, Theodoros A. Papadopoulos, Horng Tay Jeng, S. J. Tang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The behavior of polar metal organic molecules, chloroaluminum phthalocyanine (ClAlPc), upon ultraviolet (UV) irradiation was investigated to evaluate the stability of the adsorption process on the Ag(111) thin film and bulk crystal. Photoelectron spectroscopy (PES) was mainly employed to measure the molecular energy states (MES) and vacuum level (VL) shift for 1-ML ClAlPc in the Cl-down configuration. A consistent trend was observed showing that ClAlPc in the Cl-down configuration is energetically more stable on the Ag thin-film surface than on the corresponding surface of the Ag bulk crystal. The intermediate adsorption state in tilted configuration during the irradiation impinging is identified by large positive VL shifts and broad spectra line shapes to infer a flipping mechanism from Cl-down to Cl-up configuration. Strain on the Ag thin films from the underlying lattice-mismatched Ge(111) substrate is considered to cause enlarged hollow sites on the Ag(111) thin-films, that anchor the Cl-down configuration more tightly on the thin-film surfaces, as confirmed by density functional theory (DFT) calculations.

Original languageEnglish
Pages (from-to)1090-1097
Number of pages8
JournalApplied Surface Science
Volume493
DOIs
StatePublished - 1 Nov 2019

Keywords

  • Adsorption
  • Chloroaluminum phthalocyanine
  • Irradiation effect
  • Photoelectron spectroscopy
  • Stability

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