Fowler-Nordheim tunneling and temperature effects in electrical conductivity of metal oxide varistors

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Abstract
The validity of Fowler‐Nordheim tunneling as an electrical conduction mechanism in MOV materials was investigated in a wide temperature range. Despite the fact that, in high‐field regions, the current‐voltage curves conform to the relation I=B exp(−γ/V), which is formally consistent with Fowler‐Nordheim tunneling, we find that the parameters B and γ are strongly temperature dependent above 60 °C. The question then arises as to whether the fit of the above relation to the I‐V curves is more accidental than an indication of the Fowler‐Nordheim tunneling mechanism in the whole temperature range.

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