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Capacitance spectroscopy of alumina sol-gel capacitors with Al top contacts

Patrick De Visschere UGent and Karel Vanbesien (2008) JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY. 45(3). p.225-235
abstract
We measured the complex capacitance C(f) of ITO/sol-gel alumina/Al capacitors deposited on glass (and some on stainless steel foil) in the frequency range 15 Hz-10 MHz. The sol-gel films were deposited by dip-coating and following a two-step process. The capacitance C(f) found was much higher than that of a pure Al2O3-film due to the remaining porosity of the film and the uptake of H2O from the environment. The C(f) curves are useful as a sensitive probe for the porosity of the sol-gel film. In particular the evolution of the capacitance curve with time after drying has been measured. The curves can qualitatively be understood by modelling the capacitor as a (nearly) percolating random insulator/conductor network, using the effective medium approximation. However a detailed understanding of the relation between the C(f,t) curves and the structure of the films requires a more elaborate model. Films sintered at 500-550 degrees C for 1 h initially behave exactly as not sintered films but in contrast with the latter they improve slowly over time. Fast sintering yields better films.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
thin film, sol-gel, capacitance, effective medium approximation, percolation, porosity, AL2O3 HUMIDITY SENSOR, CERAMIC SENSORS, IMPEDANCE, PERCOLATION, FILMS, SIMULATION, ELECTRODES, CONDUCTORS, DEPENDENCE, RESISTANCE
journal title
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
J. Sol-Gel Sci. Technol.
volume
45
issue
3
pages
225-235 pages
publisher
Springer
place of publication
Dordrecht, The Netherlands
Web of Science type
Article
Web of Science id
000253129300001
JCR category
MATERIALS SCIENCE, CERAMICS
JCR impact factor
1.433 (2008)
JCR rank
5/24 (2008)
JCR quartile
1 (2008)
ISSN
0928-0707
DOI
10.1007/s10971-008-1687-2
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
419544
handle
http://hdl.handle.net/1854/LU-419544
date created
2008-06-18 11:16:00
date last changed
2009-07-01 08:50:35
@article{419544,
  abstract     = {We measured the complex capacitance C(f) of ITO/sol-gel alumina/Al capacitors deposited on glass (and some on stainless steel foil) in the frequency range 15 Hz-10 MHz. The sol-gel films were deposited by dip-coating and following a two-step process. The capacitance C(f) found was much higher than that of a pure Al2O3-film due to the remaining porosity of the film and the uptake of H2O from the environment. The C(f) curves are useful as a sensitive probe for the porosity of the sol-gel film. In particular the evolution of the capacitance curve with time after drying has been measured. The curves can qualitatively be understood by modelling the capacitor as a (nearly) percolating random insulator/conductor network, using the effective medium approximation. However a detailed understanding of the relation between the C(f,t) curves and the structure of the films requires a more elaborate model. Films sintered at 500-550 degrees C for 1 h initially behave exactly as not sintered films but in contrast with the latter they improve slowly over time. Fast sintering yields better films.},
  author       = {De Visschere, Patrick and Vanbesien, Karel},
  issn         = {0928-0707},
  journal      = {JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY},
  keyword      = {thin film,sol-gel,capacitance,effective medium approximation,percolation,porosity,AL2O3 HUMIDITY SENSOR,CERAMIC SENSORS,IMPEDANCE,PERCOLATION,FILMS,SIMULATION,ELECTRODES,CONDUCTORS,DEPENDENCE,RESISTANCE},
  language     = {eng},
  number       = {3},
  pages        = {225--235},
  publisher    = {Springer},
  title        = {Capacitance spectroscopy of alumina sol-gel capacitors with Al top contacts},
  url          = {http://dx.doi.org/10.1007/s10971-008-1687-2},
  volume       = {45},
  year         = {2008},
}

Chicago
De Visschere, Patrick, and Karel Vanbesien. 2008. “Capacitance Spectroscopy of Alumina Sol-gel Capacitors with Al Top Contacts.” Journal of Sol-gel Science and Technology 45 (3): 225–235.
APA
De Visschere, P., & Vanbesien, K. (2008). Capacitance spectroscopy of alumina sol-gel capacitors with Al top contacts. JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 45(3), 225–235.
Vancouver
1.
De Visschere P, Vanbesien K. Capacitance spectroscopy of alumina sol-gel capacitors with Al top contacts. JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY. Dordrecht, The Netherlands: Springer; 2008;45(3):225–35.
MLA
De Visschere, Patrick, and Karel Vanbesien. “Capacitance Spectroscopy of Alumina Sol-gel Capacitors with Al Top Contacts.” JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 45.3 (2008): 225–235. Print.