Abstract
By means of a ‘rare double pulse technique’, it is shown that the mechanism of threshold switching in thin chalcogenide glass systems is essentially non-thermal in character. The switches were prepared by evaporating layers of approximately 1μ thickness on to polished graphite electrodes, using Te40As35Ge7Si18 as starting material. Polarization effects and polarization reversals on switching have been observed which are in qualitative harmony with a space charge theory of threshold switching previously advanced, at any rate in the low-temperature range (−78°C to +20°C). A non-polar electronic process is evidently operative above room temperature. The magnitude of the perturbation caused by heat dissipation in these systems is also assessed.
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