In terms of energy bands, semiconductors can be defined as those materials that have:
1
Almost an empty conduction band and almost filled valence band with a very narrow energy gap between the conduction and valence band.
2
Almost an empty conduction band and almost filled valence band with a very high energy gap between the conduction and valence band
3
Almost and empty conduction band and low filled valence band with a very narrow energy gap between the conduction and valence band
4
Almost full conduction band and almost filled valence band with a very narrow energy gap between the conduction and valence band
5
Question Not Attempted