Correlation between the microscopic and macroscopic characteristics of SnO2 thin film gas sensors

Andreia Lopes, Elvira Fortunato, Patrícia Nunes, Paula Vilarinho, Rodrigo Martins

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Hall effect measurements have been used to evaluate the conduction mechanism, exhibited by tin oxide thin film gas sensors deposited by spray pyrolysis. Two experiments have been carried out: (i) Hall measurements in air and (ii) in the presence of methane (first results reported), both as a function of temperature. From the measurements performed it was possible to infer the potential barrier and its dependence with the atmosphere used. The results obtained for the carrier concentration and mobility have been analysed in the light of the oxygen diffusion mechanism at grain boundaries by using the grain boundary-trapping model. In the presence of the methane gas the electrical resistivity decreases due to the lowering of the inter-grain boundary barrier height.

Original languageEnglish
Pages (from-to)1349-1351
Number of pages3
JournalInternational Journal Of Inorganic Materials
Volume3
Issue number8
DOIs
Publication statusPublished - 2001

Keywords

  • Gas sensors
  • Hall effect
  • Thin films
  • Tin oxide

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