Answer: semiconductors

AnswerCrossword Clue
semiconductorsSEMICONDUCTOR, an element or compound having a resistivity between that of a conductor and an insulator
semiconductorsA solid substance that has a conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects. Devices made of semiconductors, notably silicon, are essential components of most electronic circuits