In the energy band diagram of a material shown below, the

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In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is

1. an insulator
2. a metal
3. an n-type semiconductor
4. a p-type semiconductor

Correct Option: D

For a p-type semiconductor, the acceptor energy level, as shown in the diagram, is slightly above the top E_v of the valence band. With very small supply of energy an electron from the valence band can jump to the level E_A and ionise acceptor negatively.