INVESTIGADORES
PONCE miguel Adolfo
congresos y reuniones científicas
Título:
Tunnelling conduction process during the degradation phenomena process in SnO2 and ZnO varistors
Autor/es:
M. A. PONCE MA RAMÍREZ M SS CASTROO PP RR BUENOO EE LONGOO JJ AA VARELAA
Lugar:
Rio de Janeiro
Reunión:
Conferencia; 11th International Conference on Advanced Materials; 2009
Institución organizadora:
SBPMAT
Resumen:
Abstract An adjustment on the electrical degradation phenomena promoted by the application of low dc voltages on SnO2 and ZnO based varistors is presented in this work [1-3]. The electrical properties of varistors systems were highly damaged after treating the samples. Variations on the potential barrier height and width determined via impedance spectroscopy measurements are discussed on the basis of atomic defects at boundary regions and changes in the donor and surface states densities. Several authors consider thermionic conduction as the dominant process in SnO2 and ZnO varistors but, for an appropriate barriers description, tunnel current through the barriers must be considered.