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

Materials Research

Miguel Adolfo Ponce¹  Miriam Susana Castro¹  Osvaldo Julio Moncada¹  Maria Dolores Echeverría¹  Celso Manuel Aldao¹ 

[1] ,Universidad Nacional de Mar del Plata Instituto de Investigaciones en Ciencia y Tecnología de Materiales Mar del Plata,Argentina

关键词: SnO2;    conduction mechanisms;    air;   

DOI  :  10.1590/S1516-14392003000400015

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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