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Title: A comparative study about electronic structures at rubrene/Ag and Ag/rubrene interfaces

The contact between the electrode and the organic semiconductor is one of the most crucial factors in determining the organic device performance. The development and production technology of different organic devices require the understanding of different types of metal/organic semiconducting thin film interfaces. Comparisons about the electronic structures at Rubrene/Ag and Ag/Rubrene interfaces have been studied using photoemission spectroscopy. The Ag on rubrene interfaces is found to show more interesting and complex natures than its counterpart. The vacuum level (VL) was shifted about 0.51 eV from push back effect for deposition of 5 Å rubrene onto Ag film whereas the electronic features of silver was only suppressed and no energy shift was resulted. While the deposition of 5 Å Ag onto rubrene film leads to the diffusion of the Ag atoms, as a cluster with quantum size effect, inside the film. Angle dependent XPS measurement indicates that diffused metal clusters were present at entire probed depth of the film. Moreover these clusters dope the uppermost surface of the rubrene film which consequences a shift of the electronic states of thick organic film towards higher binding energy. The VL was found to shift about 0.31 eV toward higher binding energy whereasmore » the shift was around 0.21 eV for the electronic states of rubrene layer.« less
Authors:
;  [1]
  1. Saha Institute of Nuclear Physics, 1/AF, Bidhan Nagar, Kolkata 700064 (India)
Publication Date:
OSTI Identifier:
22492147
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 10; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BINDING ENERGY; COMPARATIVE EVALUATIONS; DEPOSITION; DIFFUSION; ELECTRONIC STRUCTURE; EV RANGE; INTERFACES; ORGANIC SEMICONDUCTORS; ORGANOMETALLIC COMPOUNDS; PROBES; SILVER; SURFACES; THIN FILMS; X-RAY PHOTOELECTRON SPECTROSCOPY