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This depends on a few parameters of which the purity and the temperature have a significant influence. For pure silicon (typically less than ppba levels of impurites (parts per billion atom), the conductivity can be represented by the following equation: log (specific conductivity) = 4.247 - (2924/T) where T is the temperature measure in Kelvin units. From a practical sense, silicon behaves like an insulator at less than 700 deg K and as a conductor at much higher temperatures. This depends on a few parameters of which the purity and the temperature have a significant influence. For pure silicon (typically less than ppba levels of impurites (parts per billion atom), the conductivity can be represented by the following equation: log (specific conductivity) = 4.247 - (2924/T) where T is the temperature measure in Kelvin units. From a practical sense, silicon behaves like an insulator at less than 700 deg K and as a conductor at much higher temperatures.

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