Question

In semiconductors, there are two charges, holes and electrons. Explain how holes are produced. Given two conductors, a piece of silicon and of copper, if temperature is lowered to absolute zero, if that is possible, how the graph of conductivity versus temperature for each material look like

Answer 1

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Is it due to the following reasons?

Metals : Due to the formation of more free electrons

Semiconductors: Due to the formation of Cooper pairs and hence the creation of Phonon field

Alloys: No Free electrons or Phonon field created