The temperature range in which the electrical properties of a semiconductor are not essentially modified by impurities in the crystal. For a pure sample of intrinsic semiconductor, the intrinsic temperature range is the whole range of working temperatures. For an extrinsic semiconductor at most temperatures, the impurities contribute most of the charge carriers; at sufficiently high temperatures however the intrinsic carrier concentration rises to such a level that the extrinsic conductivity becomes negligible compared to the intrinsic conductivity and at that temperature the semiconductor becomes intrinsic.