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Journal of Vacuum Science & Technology A / Volume 29 / Issue 1 / Articles

J. Vac. Sci. Technol. A 29, 011019 (2011); http://dx.doi.org/10.1116/1.3525641 (4 pages)

Work function of fluorine doped tin oxide

M. G. Helander1, M. T. Greiner1, Z. B. Wang1, W. M. Tang1, and Z. H. Lu2

1Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada
2Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada and Department of Physics, Yunnan University, 2 Cuihu Beilu, Yunnan, Kunming 650091, People’s Republic of China

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(Published online 5 January 2011)

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Fluorine doped tin oxide (FTO) is a commonly used transparent conducting oxide in optoelectronic device applications. The work function of FTO is commonly cited as 4.4 eV, which is incommensurate with recent device performance results. Using x-ray photoelectron spectroscopy, the authors measured the work function of commercial FTO to be 5.0±0.1 eV. UV ozone treatment was found to increase the work function by ∼ 0.1 eV due to surface band bending. The origins of the much lower work function previously reported are also discussed and are found to be a result of carbon contamination and UV induced work function lowering.

© 2011 American Vacuum Society

ACKNOWLEDGMENT

We wish to acknowledge funding for this research from Natural Sciences and Engineering Research Council (NSERC) of Canada.

Article Outline

  1. INTRODUCTION
  2. EXPERIMENT
  3. RESULTS AND DISCUSSION
  4. SUMMARY

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KEYWORDS and PACS

Keywords

bending, fluorine, tin compounds, ultraviolet spectra, work function, X-ray photoelectron spectra, Fluorine doped tin oxide, tin oxide (SnO2)

PACS

  • 73.30.+y

    Surface double layers, Schottky barriers, and work functions

  • 79.60.Bm

    Clean metal, semiconductor, and insulator surfaces

  • 78.66.Nk

    Insulators

  • 81.40.Lm

    Deformation, plasticity, and creep

  • 78.40.Ha

    Other nonmetallic inorganics

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History
Received 22 September 2010
Accepted 14 November 2010
Published online 5 January 2011
Digital Object Identifier
http://dx.doi.org/10.1116/1.3525641

PUBLICATION DATA

ISSN

0734-2101 (print)  
1520-8559 (online)

Publisher

American Vacuum Society

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