Otro
BARRIER VOLTAGE DEFORMATION OF ZNO VARISTORS BY CURRENT PULSE
Registration in:
Journal of Applied Physics. Woodbury: Amer Inst Physics, v. 72, n. 1, p. 147-150, 1992.
0021-8979
10.1063/1.352175
WOS:A1992JB34700023
WOSA1992JB34700023.pdf
Author
Leite, E. R.
Varela, José Arana
Longo, Elson
Abstract
The phenomenon of electrical degradation in ZnO varistors was studied by application of high-intensity current pulses. A wave shape of 8 X 20-mu-s and rectangular waves of 1 and 2 ms were used. The degradation was estimated by reference electric-field variation and by Schottky voltage barrier deformation. The results showed that current pulses reduce both the height and the width of the barrier voltage. It was also observed that the donor density N(d) did not change but the surface states density N(s) decreased with degradation.