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(D) In the provided energy band diagram,we observe an acceptor energy level situated just above the valence band. Electrons from the valence band have

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a $p$-type semiconductor

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(D) In the provided energy band diagram,we observe an acceptor energy level situated just above the valence band. Electrons from the valence band have transitioned to this acceptor level,creating holes in the valence band. The diagram clearly shows a significantly higher concentration of holes (open circles) compared to electrons (filled circles) in the valence band. This characteristic,where holes are the majority charge carriers,identifies the material as a $p$-type semiconductor.

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

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