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Title: Anomalous photoelectric emission from Ag on zinc-phthalocyanine film

Photoelectric emission from organic and metal thin films is generally observed with irradiation of photon energy larger than 4 eV. In this paper, however, we report photoelectric emission from Ag on a zinc-phthalocyanine (ZnPc) layer at a photon energy of 3.4 eV. The threshold energy for this photoelectric emission is much smaller than the work function of Ag estimated by conventional photoelectron spectroscopy. The photoelectric emission by low-energy photons is significant for Ag thicknesses of less than 1 nm. Photoelectron spectroscopy and morphological study of the Ag/ZnPc suggest that the anomalous photoelectric emission from the Ag surface is caused by a vacuum level shift at the Ag/ZnPc interface and by surface plasmons of the Ag nanoparticles.
Authors:
 [1] ; ; ;  [2] ; ; ; ; ;  [3]
  1. Department of Electric and Electronic Engineering, Faculty of Science and Engineering, Kinki University, Higashiosaka 577-8502 (Japan)
  2. Department of Physics and Materials Science, Graduate School of Science and Engineering, Shimane University, Matsue 690-8504 (Japan)
  3. Synchrotron Light Application Center, Saga University, Saga 840-8502 (Japan)
Publication Date:
OSTI Identifier:
22273420
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; NANOSTRUCTURES; PHOTOELECTRIC EMISSION; PHOTOELECTRON SPECTROSCOPY; PHOTONS; PHTHALOCYANINES; PLASMONS; SURFACES; THIN FILMS; THRESHOLD ENERGY; WORK FUNCTIONS; ZINC