Thermionic, Tunnelling, and Polarization Currents in zinc Oxide Varistors

摘要

We report an analysis of time, voltage, and temper- ature dependencies for ZnO varistors conductance. The conduction mechanisms proposed to interpret Experiments include thermionic, tunnelling, and Polarization currents. We analyse here the contribu- Tions of these mechanisms to conduction in order to Identify their roles. We conclude that a tunnelling Current shows the correct trends in the current- Temperature curve. Also, capacitance measurements As a function of time and temperature are presented To discuss the influence of interface and deep bulk Traps.