Answer to Question #164854 in Electric Circuits for Kath

Question

how does semiconductors change from being an insulator to being a conductor and back to an insulator again?

Answer 1

At room temprature, There was a string connection or covalent bond between the carbon atom.

Thus they behave as an insulator.

While as the temprature goes on increasing, The covalent bond breaks due to which electeon-hole pair produced. Thus charge started floeing in the semiconductor and they behave as conductor at higher temprature.

As soon as the temprature started decreasing, The semiconductor again became intrinsic and became insulator at room temprature.