Materials Research (Jan 2003)

Efectos de la exposición a vacío y aire de películas de SnO2 con distinto espesor

  • Ponce Miguel Adolfo,
  • Castro Miriam Susana,
  • Moncada Osvaldo Julio,
  • Echeverría Maria Dolores,
  • Aldao Celso Manuel

Journal volume & issue
Vol. 6, no. 4
pp. 515 – 518

Abstract

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Gas sensors based in semiconductor oxides show a change in the resistance when they are exposed to certain gaseous atmospheres. In this paper, the influence on the sensor electrical resistance with the film thickness in vacuum and air are studied. The conduction process is analyzed considering the existence of Schottky potential barriers at the grain boundaries. These barriers are affected by the intergranular gas diffusion. This process increases the barrier height and width, altering the electrical resistance. Also, the influence of the diffusion process on the stabilization time is analized.

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